LTM4600HV
10A, 28VIN High Efficiency
DC/DC µModule
Features
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Complete Switch Mode Power Supply
Wide Input Voltage Range: 4.5V to 28V
10A DC, 12A Peak Output Current
Parallel Two µModule™ DC/DC Converters for 20A
Output Current
0.6V to 5V Output Voltage
1.5% Output Voltage Regulation
Ultrafast Transient Response
Current Mode Control
–55°C to 125°C Operating Temperature Range
(LTM4600HVMPV)
RoHS Compliant Package with Gold Pad Finish (e4)
Up to 92% Efficiency
Programmable Soft-Start
Output Overvoltage Protection
Optional Short-Circuit Shutdown Timer
Small Footprint, Low Profile (15mm × 15mm ×
2.82mm) LGA Package
Applications
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The LTM®4600HV is a complete 10A, DC/DC step down
power supply with up to 28V input operation. Included
in the package are the switching controller, power FETs,
inductor, and all support components. Operating over
an input voltage range of 4.5V to 28V, the LTM4600HV
supports an output voltage range of 0.6V to 5V, set by a
single resistor. This high efficiency design delivers 10A
continuous current (12A peak), needing no heat sinks or
airflow to meet power specifications. Only bulk input and
output capacitors are needed to finish the design.
The low profile package (2.82mm) enables utilization of
unused space on the bottom of PC boards for high density
point of load regulation. High switching frequency and an
adaptive on-time current mode architecture enables a very
fast transient response to line and load changes without
sacrificing stability. Fault protection features include
integrated overvoltage and short circuit protection with
a defeatable shutdown timer. A built-in soft-start timer is
adjustable with a small capacitor.
The LTM4600HV is packaged in a compact (15mm ×
15mm) and low profile (2.82mm) over-molded Land Grid
Array (LGA) package suitable for automated assembly by
standard surface mount equipment. The LTM4600HV is
RoHS compliant.
Telecom and Networking Equipment
Military and Avionics Systems
Industrial Equipment
Point of Load Regulation
Servers
L, LT, LTC, LTM, µModule and OPTI-LOOP are registered trademarks of Linear Technology
Corporation. All other trademarks are the property of their respective owners.
Typical Application
Efficiency vs Load Current with 24VIN (FCB = 0)
100
10A µModule Power Supply with 4.5V to 28V Input
VIN
4.5V TO 28V
ABSMAX
CIN
VIN
VOUT
LTM4600HV
VOUT
2.5V*
10A
COUT
VOSET
PGND SGND
*REVIEW DE-RATING CURVE AT
THE HIGHER INPUT VOLTAGE
90
EFFICIENCY (%)
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Description
80
70
60
31.6k
50
4600hv TA01a
40
30
1.8VOUT
2.5VOUT
3.3VOUT
5VOUT
0
2
4
6
LOAD CURRENT (A)
8
10
4600HV TA01b
4600hvfe
For more information www.linear.com/LTM4600HV
1
LTM4600HV
Absolute Maximum Ratings
Pin Configuration
(Note 1)
TOP VIEW
fADJ
SVIN
EXTVCC
VOSET
FCB, EXTVCC, PGOOD, RUN/SS, VOUT.......... –0.3V to 6V
VIN, SVIN, fADJ............................................. –0.3V to 28V
VOSET, COMP............................................. –0.3V to 2.7V
Operating Temperature Range (Note 2)
E and I Grades......................................–40°C to 85°C
MP Grade............................................ –55°C to 125°C
Junction Temperature............................................ 125°C
Storage Temperature Range................... –55°C to 125°C
Peak Solder Reflow Body Temperature.................. 245°C
COMP
SGND
RUN/SS
FCB
VIN
PGOOD
PGND
VOUT
LGA PACKAGE
104-LEAD (15mm × 15mm × 2.82mm)
TJMAX = 125°C, θJA = 15°C/W, θJC = 6°C/W,
θJA DERIVED FROM 95mm × 76mm PCB WITH 4 LAYERS, WEIGHT = 1.7g
Order Information
PART MARKING
PART NUMBER
PAD OR BALL FINISH
LTM4600HVEV#PBF
LTM4600HVIV#PBF
LTM4600HVMPV#PBF
DEVICE
FINISH CODE
PACKAGE
TYPE
MSL
RATING
e4
LGA
3
LTM4600HVEV
Au (RoHS)
LTM4600HVIV
TEMPERATURE RANGE
(SEE NOTE 2)
–40°C to 85°C
LTM4600HVMPV
–40°C to 85°C
–55°C to 125°C
• Consult Marketing for parts specified with wider operating temperature
ranges. *Pad or ball finish code is per IPC/JEDEC J-STD-609.
• Recommended LGA and BGA PCB Assembly and Manufacturing
Procedures: www.linear.com/umodule/pcbassembly
• Terminal Finish Part Marking: www.linear.com/leadfree
• LGA and BGA Package and Tray Drawings: www.linear.com/packaging
2
4600hvfe
For more information www.linear.com/LTM4600HV
LTM4600HV
Electrical
Characteristics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C, VIN = 12V. External CIN = 120µF, COUT = 200µF/Ceramic per typical
application (front page) configuration.
SYMBOL
VIN(DC)
PARAMETER
Input DC Voltage
CONDITIONS
Abs Max 28V for Tolerance on 24V Inputs
VOUT(DC)
Output Voltage
FCB = 0V
VIN = 5V or 12V, VOUT = 1.5V, IOUT = 0A
MIN
4.5
TYP
l
MAX
28
UNITS
V
l
1.478
1.470
1.50
1.50
1.522
1.530
V
V
3.4
4
V
Input Specifications
VIN(UVLO)
Under Voltage Lockout Threshold
IOUT = 0A
IINRUSH(VIN)
Input Inrush Current at Startup
IQ(VIN)
Input Supply Bias Current
IOUT = 0A, VOUT = 1.5V, FCB = 0
VIN = 5V
VIN = 12V
VIN = 24V
IOUT = 0A, EXTVCC Open
VIN = 12V, VOUT = 1.5V, FCB = 5V
VIN = 12V, VOUT = 1.5V, FCB = 0V
VIN = 24V, VOUT = 2.5V, FCB = 5V
VIN = 24V, VOUT = 2.5V, FCB = 0V
Shutdown, RUN = 0.8V, VIN = 12V
Min On Time
Min Off Time
IS(VIN)
Input Supply Current
VIN = 12V, VOUT = 1.5V, IOUT = 10A
VIN = 12V, VOUT = 3.3V, IOUT = 10A
VIN = 5V, VOUT = 1.5V, IOUT = 10A
VIN = 24V to 3.3V at 10A, EXTVCC = 5V
0.6
0.7
0.8
A
A
A
1.2
42
1.8
36
35
100
mA
mA
mA
mA
µA
ns
75
400
ns
1.52
3.13
3.64
1.6
A
A
A
A
Output Specifications
IOUTDC
ΔVOUT(LINE)
Output Continuous Current Range
(See Output Current Derating Curves for
Different VIN, VOUT and TA)
Line Regulation Accuracy
VOUT
ΔVOUT(LOAD) Load Regulation Accuracy
VIN = 12V, VOUT = 1.5V
VIN = 24V, VOUT = 2.5V (Note 3)
VOUT = 1.5V. FCB = 0V, IOUT = 0A,
VIN = 4.5V to 28V
VOUT(AC)
Output Ripple Voltage
VOUT = 1.5V. FCB = 0V, IOUT = 0A to 10A
VIN = 5V
VIN = 12V (Notes 4, 5)
VIN = 12V, VOUT = 1.5V, FCB = 0V, IOUT = 0A
fs
Output Ripple Voltage Frequency
FCB = 0V, IOUT = 5A, VIN = 12V, VOUT = 1.5V
tSTART
Turn-On Time
VOUT
tSETTLE
VOUT = 1.5V, IOUT = 1A
VIN = 12V
VIN = 5V
Voltage Drop for Dynamic Load Step
VOUT = 1.5V, Load Step: 0A/µs to 5A/µs
COUT = 3 • 22µF 6.3V, 470µF 4V POSCAP,
See Table 2
Settling Time for Dynamic Load Step VIN = 12V Load: 10% to 90% to 10% of Full Load
IOUTPK
Output Current Limit
Output Voltage in Foldback
VIN = 24V, VOUT = 2.5V
VIN = 12V, VOUT = 1.5V
VIN = 5V, VOUT = 1.5V
VOSET
Voltage at VOSET Pin
IOUT = 0A, VOUT = 1.5V
VRUN/SS
RUN ON/OFF Threshold
ΔVOUTLS
0
0
l
10
10
A
A
0.15
0.3
%
%
%
10
±1
±1.5
15
l
mVP-P
850
kHz
0.5
0.7
36
ms
ms
mV
25
µs
17
17
17
A
A
A
Control Stage
l
0.591
0.594
0.8
0.6
0.6
1.5
0.609
0.606
2
V
V
V
4600hvfe
For more information www.linear.com/LTM4600HV
3
LTM4600HV
Electrical
Characteristics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C, VIN = 12V. External CIN = 120µF, COUT = 200µF/Ceramic per typical
application (front page) configuration.
SYMBOL
IRUN(C)/SS
PARAMETER
Soft-Start Charging Current
IRUN(D)/SS
Soft-Start Discharging Current
VIN – SVIN
IEXTVCC
Current into EXTVCC Pin
RFBHI
Resistor Between VOUT and VOSET Pins
VFCB
Forced Continuous Threshold
IFCB
Forced Continuous Pin Current
CONDITIONS
VRUN/SS = 0V
MIN
–0.5
VRUN/SS = 4V
0.8
TYP
–1.2
MAX
–3
1.8
3
UNITS
µA
µA
EXTVCC = 0V, FCB = 0V
100
mV
EXTVCC = 5V, FCB = 0V, VOUT = 1.5V, IOUT = 0A
16
mA
100
kΩ
0.57
VFCB = 0.6V
0.6
0.63
V
–1
–2
µA
PGOOD Output
ΔVOSETH
PGOOD Upper Threshold
VOSET Rising
7.5
10
12.5
%
ΔVOSETL
PGOOD Lower Threshold
VOSET Falling
–7.5
–10
–12.5
%
ΔVOSET(HYS)
PGOOD Hysteresis
VOSET Returning
VPGL
PGOOD Low Voltage
IPGOOD = 5mA
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTM4600HVE is guaranteed to meet performance
specifications from 0°C to 85°C. Specifications over the –40°C to 85°C
operating temperature range are assured by design, characterization
and correlation with statistical process controls. The LTM4600HVI
4
2
0.15
%
0.4
V
is guaranteed over the –40°C to 85°C temperature range. The
LTM46000HVMP is guaranteed and tested over the –55°C to 125°C
temperature range.
Note 3: For output current derating at high temperature, please refer to
Thermal Considerations and Output Current Derating discussion.
Note 4: Test assumes current derating versus temperature.
Note 5: Guaranteed by correlation.
4600hvfe
For more information www.linear.com/LTM4600HV
LTM4600HV
Typical Performance Characteristics
100
Efficiency vs Load Current
with 12VIN (FCB = 0)
100
90
90
80
80
80
70
60
50
40
30
0
2
8
6
4
LOAD CURRENT (A)
70
60
0.6VOUT
1.2VOUT
1.5VOUT
2.5VOUT
3.3VOUT
50
0.6VOUT
1.2VOUT
1.5VOUT
2.5VOUT
40
10
30
0
2
4
6
LOAD CURRENT (A)
4600hv G01
Efficiency vs Load Current
with Different FCB Settings
EFFICIENCY (%)
90
EFFICIENCY (%)
EFFICIENCY (%)
100
Efficiency vs Load Current
with 5VIN (FCB = 0)
(See Figure 21 for all curves)
8
Efficiency vs Load Current
with 24VIN (FCB = 0)
70
60
50
1.8VOUT
2.5VOUT
3.3VOUT
5VOUT
40
10
30
0
2
4
6
LOAD CURRENT (A)
4600hv G02
1.2V Transient Response
8
10
4600hv G03
1.5V Transient Response
90
FCB > 0.7V
80
VOUT = 50mV/DIV
EFFICIENCY (%)
70
60
FCB = GND
50
IOUT = 5A/DIV
40
30
20
0.1
25µs/DIV
VIN = 12V
VOUT = 1.5V
1
LOAD CURRENT (A)
10
4600HV G05
25µs/DIV
1.2V AT 5A/µs LOAD STEP
COUT = 3 • 22µF 6.3V CERAMICS
470µF 4V SANYO POSCAP
C3 = 100pF
1.5V AT 5A/µs LOAD STEP
COUT = 3 • 22µF 6.3V CERAMICS
470µF 4V SANYO POSCAP
C3 = 100pF
2.5V Transient Response
3.3V Transient Response
4600HV G06
4600hv G04
1.8V Transient Response
25µs/DIV
1.8V AT 5A/µs LOAD STEP
COUT = 3 • 22µF 6.3V CERAMICS
470µF 4V SANYO POSCAP
C3 = 100pF
4600HV G07
25µs/DIV
4600HV G08
2.5V AT 5A/µs LOAD STEP
COUT = 3 • 22µF 6.3V CERAMICS
470µF 4V SANYO POSCAP
C3 = 100pF
25µs/DIV
4600HV G09
3.3V AT 5A/µs LOAD STEP
COUT = 3 • 22µF 6.3V CERAMICS
470µF 4V SANYO POSCAP
C3 = 100pF
4600hvfe
For more information www.linear.com/LTM4600HV
5
LTM4600HV
Typical Performance Characteristics (See Figure 21 for all curves)
Start-Up, IOUT = 10A
(Resistive Load)
Start-Up, IOUT = 0A
VOUT
(0.5V/DIV)
VOUT
(0.5V/DIV)
IIN
(0.5A/DIV)
IIN
(0.5A/DIV)
4600HV G11
200µs/DIV
VIN = 12V
VOUT = 1.5V
COUT = 200µF
NO EXTERNAL SOFT-START CAPACITOR
4600HV G10
200µs/DIV
VIN = 12V
VOUT = 1.5V
COUT = 200µF
NO EXTERNAL SOFT-START CAPACITOR
Short-Circuit Protection,
IOUT = 0A
Short-Circuit Protection,
IOUT = 10A
5.5
fADJ = OPEN
5.0
VOUT
(0.5V/DIV)
VOUT
(0.5V/DIV)
VIN to VOUT Step-Down Ratio
5V
4.5
4.0
IIN
(0.2A/DIV)
IIN
(0.5A/DIV)
4600HV G12
200µs/DIV
VIN = 12V
VOUT = 1.5V
COUT = 2× 200µF/X5R
NO EXTERNAL SOFT-START CAPACITOR
3.3V
VOUT (V)
3.5
3.0
2.5V
2.5
1.8V
2.0
4600HV G13
20µs/DIV
VIN = 12V
VOUT = 1.5V
COUT = 2× 200µF/X5R
NO EXTERNAL SOFT-START CAPACITOR
1.5V
1.5
1.0
1.2V
0.5
0
0.6V
0
5
10
20
15
VIN (V)
24
SEE FREQUENCY ADJUSTMENT DISCUSSION
FOR 12VIN TO 5VOUT AND 5VIN TO 3.3VOUT
CONVERSION
4600HV G14
VOSET vs Temperature
12V Input Load Regulation vs
Temperature
Start-Up Waveform, TA = –55°C
0.00
0.610
–0.05
–0.10
LOAD REGULATION %
VOSET(V)
0.605
0.600
0.595
0.590
–55
–0.20
–0.25
25°C
–0.30
100°C
–0.35
–25
5
35
65
TEMPERATURE (°C)
95
125
VIN = 12V
VOUT = 1.5V
IOUT = 10A
400μs/DIV
4600HV G16
–45°C
–0.40
–0.45
0
5
LOAD CURRENT
10
4600HV G17
4600HV G15
6
–0.15
4600hvfe
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LTM4600HV
Pin Functions
(See Package Description for Pin Assignment)
SGND (Pin D23): Signal Ground Pin. All small-signal
components should connect to this ground, which in turn
connects to PGND at one point.
VIN (Bank 1): Power Input Pins. Apply input voltage
between these pins and GND pins. Recommend placing
input decoupling capacitance directly between VIN pins
and GND pins.
RUN/SS (Pin F23): Run and Soft-Start Control. Forcing
this pin below 0.8V will shut down the power supply.
Inside the power module, there is a 1000pF capacitor
which provides approximately 0.7ms soft-start time with
200µF output capacitance. Additional soft-start time can
be achieved by adding additional capacitance between
the RUN/SS and SGND pins. The internal short-circuit
latchoff can be disabled by adding a resistor between this
pin and the VIN pin. This resistor must supply a minimum
5µA pull up current. The RUN/SS pin has an internal 6V
Zener to ground.
fADJ (Pin A15): A 110k resistor from VIN to this pin sets
the one-shot timer current, thereby setting the switching frequency. The LTM4600HV switching frequency is
typically 850kHz. An external resistor to ground can be
selected to reduce the one-shot timer current, thus lower
the switching frequency to accommodate a higher duty
cycle step down requirement. See the applications section.
SVIN (Pin A17): Supply Pin for Internal PWM Controller.
Leave this pin open or add additional decoupling capacitance.
EXTVCC (Pin A19): External 5V supply pin for controller. If
left open or grounded, the internal 5V linear regulator will
power the controller and MOSFET drivers. For high input
voltage applications, connecting this pin to an external
5V will reduce the power loss in the power module. The
EXTVCC voltage should never be higher than VIN.
FCB (Pin G23): Forced Continuous Input. Grounding this
pin enables forced continuous mode operation regardless
of load conditions. Tying this pin above 0.63V enables
discontinuous conduction mode to achieve high efficiency
operation at light loads. There is an internal 4.75K resistor
between the FCB and SGND pins.
VOSET (Pin A21): The Negative Input of The Error Amplifier.
Internally, this pin is connected to VOUT with a 100k precision resistor. Different output voltages can be programmed
with additional resistors between the VOSET and SGND pins.
PGOOD (Pin J23): Output Voltage Power Good Indicator.
When the output voltage is within 10% of the nominal
voltage, the PGOOD is open drain output. Otherwise, this
pin is pulled to ground.
COMP (Pin B23): Current Control Threshold and Error
Amplifier Compensation Point. The current comparator
threshold increases with this control voltage. The voltage
ranges from 0V to 2.4V with 0.8V corresponding to zero
sense voltage (zero current).
PGND (Bank 2): Power ground pins for both input and
output returns.
VOUT (Bank 3): Power Output Pins. Apply output load
between these pins and GND pins. Recommend placing
High Frequency output decoupling capacitance directly
between these pins and GND pins.
5
6
VOSET
4
EXTVCC
3
SVIN
2
fADJ
TOP VIEW
16
17
18
19
7
1
VIN
BANK 1
9
10
8
13
14
32
PGND
BANK 2
VOUT
BANK 3
1
26
27
28
29
30
31
33
34
35
36
37
38
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
2
4
6
7
8
9
10
11
12
C
22
E
24
40
5
21
23
39
3
A
15
12
25
20
11
13
14
15
16
17
18
19
20
21
22
G
J
B
COMP
D
SGND
F
RUN/SS
H
K
FCB
PGOOD
L
M
N
P
R
T
23
For more information www.linear.com/LTM4600HV
4600hv PN01
4600hvfe
7
LTM4600HV
Simplified Block Diagram
SVIN
RUN/SS
LTM4600HV
VIN, 4.5V TO 28V ABS MAX
1000pF
CIN
1.5μF
PGOOD
Q1
COMP
INT
COMP
VOUT, 2.5V/10A MAX
FCB
4.75k
COUT
15μF
6.3V
CONTROLLER
fADJ
SGND
PGND
Q2
10Ω
EXTVCC
100k
0.5%
VOSET
R6
31.6k
4600hv F01
Figure 1. Simplified LTM4600HV Block Diagram
Decoupling Requirements TA = 25°C, VIN = 12V. Use Figure 1 configuration.
SYMBOL
PARAMETER
CONDITIONS
CIN
External Input Capacitor Requirement
(VIN = 4.5V to 28V, VOUT = 2.5V)
IOUT = 10A, 2x 10µF 35V Ceramic
Taiyo Yuden GDK316BJ106ML
20
COUT
External Output Capacitor Requirement
(VIN = 4.5V to 28V, VOUT = 2.5V)
IOUT = 10A, Refer to Table 2 in the
Applications Information Section
100
8
MIN
TYP
MAX
UNITS
µF
200
µF
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LTM4600HV
Operation
µModule Description
The LTM4600HV is a standalone non-isolated synchronous
switching DC/DC power supply. It can deliver up to 10A of
DC output current with only bulk external input and output
capacitors. This module provides a precisely regulated
output voltage programmable via one external resistor
from 0.6VDC to 5.0VDC. The input voltage range is 4.5V to
28V. A simplified block diagram is shown in Figure 1 and
the typical application schematic is shown in Figure 21.
The LTM4600HV contains an integrated LTC constant
on-time current-mode regulator, ultra-low RDS(ON) FETs
with fast switching speed and integrated Schottky diode.
The typical switching frequency is 850kHz at full load.
With current mode control and internal feedback loop
compensation, the LTM4600HV module has sufficient
stability margins and good transient performance under a
wide range of operating conditions and with a wide range
of output capacitors, even all ceramic output capacitors
(X5R or X7R for extended temperature range).
Current mode control provides cycle-by-cycle fast current
limit. In addition, foldback current limiting is provided
in an over-current condition while VOSET drops. Also,
the LTM4600HV has defeatable short circuit latch off.
Internal overvoltage and undervoltage comparators pull
the open-drain PGOOD output low if the output feedback
voltage exits a ±10% window around the regulation point.
Furthermore, in an overvoltage condition, internal top FET
Q1 is turned off and bottom FET Q2 is turned on and held
on until the overvoltage condition clears.
Pulling the RUN/SS pin low forces the controller into its
shutdown state, turning off both Q1 and Q2. Releasing the
pin allows an internal 1.2µA current source to charge up
the soft-start capacitor. When this voltage reaches 1.5V,
the controller turns on and begins switching.
At low load current the module works in continuous current mode by default to achieve minimum output voltage
ripple. It can be programmed to operate in discontinuous
current mode for improved light load efficiency when the
FCB pin is pulled up above 0.8V and no higher than 6V.
The FCB pin has a 4.75k resistor to ground, so a resistor
to VIN can set the voltage on the FCB pin.
When EXTVCC pin is grounded or open, an integrated 5V
linear regulator powers the controller and MOSFET gate
drivers. If a minimum 4.7V external bias supply is applied on the EXTVCC pin, the internal regulator is turned
off, and an internal switch connects EXTVCC to the gate
driver voltage. This eliminates the linear regulator power
loss with high input voltage, reducing the thermal stress
on the controller. The maximum voltage on EXTVCC pin is
6V. The EXTVCC voltage should never be higher than the
VIN voltage. Also EXTVCC must be sequenced after VIN.
Recommended for 24V operation to lower temperature
in the µModule.
4600hvfe
For more information www.linear.com/LTM4600HV
9
LTM4600HV
Applications Information
The typical LTM4600HV application circuit is shown in
Figure 21. External component selection is primarily determined by the maximum load current and output voltage.
Output Voltage Programming and Margining
The PWM controller of the LTM4600HV has an internal
0.6V±1% reference voltage. As shown in the block diagram, a 100k/0.5% internal feedback resistor connects
VOUT and VOSET pins. Adding a resistor RSET from VOSET
pin to SGND pin programs the output voltage:
100k +RSET
VO = 0.6V •
RSET
Table 1.
RSET
(kΩ)
Open
100
66.5
49.9
43.2
31.6
22.1
13.7
VO
(V)
0.6
1.2
1.5
1.8
2
2.5
3.3
5
Voltage margining is the dynamic adjustment of the output
voltage to its worst case operating range in production
testing to stress the load circuitry, verify control/protection functionality of the board and improve the system
reliability. Figure 2 shows how to implement margining
function with the LTM4600HV. In addition to the feedback
resistor RSET, several external components are added.
Turn off both transistor QUP and QDOWN to disable the
margining. When QUP is on and QDOWN is off, the output
voltage is margined up. The output voltage is margined
VOUT
RDOWN
100k
QDOWN
2N7002
VOSET
PGND
SGND
RSET
RUP
QUP
2N7002
4600hv F02
Figure 2. LTM4600HV Margining Implementation
10
(RSET RUP ) • VO • (1+M%)
= 0.6V
(RSET RUP )+ 100kΩ
RSET • VO • (1– M%)
= 0.6V
RSET +(100kΩ RDOWN )
Input Capacitors
Table 1 shows the standard values of 1% RSET resistor
for typical output voltages:
LTM4600HV
down when QDOWN is on and QUP is off. If the output
voltage VO needs to be margined up/down by ±M%, the
resistor values of RUP and RDOWN can be calculated from
the following equations:
The LTM4600HV µModule should be connected to a low
ac-impedance DC source. High frequency, low ESR input
capacitors are required to be placed adjacent to the module. In Figure 21, the bulk input capacitor CIN is selected
for its ability to handle the large RMS current into the
converter. For a buck converter, the switching duty-cycle
can be estimated as:
D=
VO
VIN
Without considering the inductor current ripple, the RMS
current of the input capacitor can be estimated as:
ICIN(RMS) =
IO(MAX)
η%
• D • (1−D)
In the above equation, η% is the estimated efficiency of
the power module. C1 can be a switcher-rated electrolytic
aluminum capacitor, OS-CON capacitor or high volume
ceramic capacitors. Note the capacitor ripple current
ratings are often based on only 2000 hours of life. This
makes it advisable to properly derate the input capacitor,
or choose a capacitor rated at a higher temperature than
required. Always contact the capacitor manufacturer for
derating requirements over temperature.
In Figure 21, the input capacitors are used as high frequency input decoupling capacitors. In a typical 10A
output application, 1-2 pieces of very low ESR X5R or
X7R (for extended temperature range), 10µF ceramic
capacitors are recommended. This decoupling capacitor
should be placed directly adjacent the module input pins
4600hvfe
For more information www.linear.com/LTM4600HV
LTM4600HV
applications information
in the PCB layout to minimize the trace inductance and
high frequency AC noise.
Output Capacitors
The LTM4600HV is designed for low output voltage ripple.
The bulk output capacitors COUT is chosen with low enough
effective series resistance (ESR) to meet the output voltage
ripple and transient requirements. COUT can be low ESR
tantalum capacitor, low ESR polymer capacitor or ceramic
capacitor (X5R or X7R). The typical capacitance is 200µF
if all ceramic output capacitors are used. The internally
optimized loop compensation provides sufficient stability
margin for all ceramic capacitors applications. Additional
output filtering may be required by the system designer,
if further reduction of output ripple or dynamic transient
spike is required. Refer to Table 2 for an output capacitance matrix for each output voltage droop, peak to peak
deviation and recovery time during a 5A/µs transient with
a specific output capacitance.
Fault Conditions: Current Limit and Over current
Foldback
The LTM4600HV has a current mode controller, which
inherently limits the cycle-by-cycle inductor current not
only in steady state operation, but also in transient.
To further limit current in the event of an over load condition,
the LTM4600HV provides foldback current limiting. If the
output voltage falls by more than 50%, then the maximum
output current is progressively lowered to about one sixth
of its full current limit value.
VIN to VOUT Step-Down Ratios
There are restrictions in the maximum VIN to VOUT step
down ratio that can be achieved for a given input voltage.
These constraints are shown in VIN to VOUT Step-Down
Ratio in the Typical Performance Characteristics section.
Note that additional thermal derating may apply. See the
Thermal Considerations and Output Current Derating sections of this data sheet.
Soft-Start and Latchoff with the RUN/SS pin
The RUN/SS pin provides a means to shut down the
LTM4600HV as well as a timer for soft-start and overcurrent latchoff. Pulling the RUN/SS pin below 0.8V puts
the LTM4600HV into a low quiescent current shutdown
(IQ ≤ 75µA). Releasing the pin allows an internal 1.2µA
current source to charge up the timing capacitor CSS.
Inside LTM4600HV, there is an internal 1000pF capacitor
from RUN/SS pin to ground. If RUN/SS pin has an external
capacitor CSS_EXT to ground, the delay before starting is
about:
tDELAY =
1.5V
• (CSS _ EXT + 1000pF)
1.2µA
When the voltage on RUN/SS pin reaches 1.5V, the
LTM4600HV internal switches are operating with a clamping of the maximum output inductor current limited by
the RUN/SS pin total soft-start capacitance. As the RUN/
SS pin voltage rises to 3V, the soft-start clamping of the
inductor current is released.
4600hvfe
For more information www.linear.com/LTM4600HV
11
LTM4600HV
Applications Information
Table 2. Output Voltage Response Versus Component Matrix *(Refer to Figure 21)
TYPICAL MEASURED VALUES
COUT1 VENDORS
TDK
TAIYO YUDEN
TAIYO YUDEN
TAIYO YUDEN
PART NUMBER
C4532X5R0J107MZ (100µF,6.3V)
JMK432BJ107MU-T ( 100µF, 6.3V)
JMK316BJ226ML-T501 ( 22µF, 6.3V)
JMK316BJ226ML-T501 ( 22µF, 6.3V)
VOUT
CIN
CIN
COUT1
(V)
(CERAMIC)
(BULK)
(CERAMIC)
2 × 10µF 35V
1.2
150µF 35V
3 × 22µF 6.3V
1.2
2 × 10µF 35V
150µF 35V
1 × 100µF 6.3V
1.2
2 × 10µF 35V
150µF 35V
2 × 100µF 6.3V
1.2
2 × 10µF 35V
150µF 35V
4 × 100µF 6.3V
1.2
2 × 10µF 35V
150µF 35V
3 × 22µF 6.3V
1.2
2 × 10µF 35V
150µF 35V
1 × 100µF 6.3V
1.2
2 × 10µF 35V
150µF 35V
2 × 100µF 6.3V
1.2
2 × 10µF 35V
150µF 35V
4 × 100µF 6.3V
1.5
2 × 10µF 35V
150µF 35V
3 × 22µF 6.3V
1.5
2 × 10µF 35V
150µF 35V
1 × 100µF 6.3V
1.5
2 × 10µF 35V
150µF 35V
2 × 100µF 6.3V
1.5
2 × 10µF 35V
150µF 35V
4 × 100µF 6.3V
1.5
2 × 10µF 35V
150µF 35V
3 × 22µF 6.3V
1.5
2 × 10µF 35V
150µF 35V
1 × 100µF 6.3V
1.5
2 × 10µF 35V
150µF 35V
2 × 100µF 6.3V
1.5
2 × 10µF 35V
150µF 35V
4 × 100µF 6.3V
1.8
2 × 10µF 35V
150µF 35V
3 × 22µF 6.3V
1.8
2 × 10µF 35V
150µF 35V
1 × 100µF 6.3V
1.8
2 × 10µF 35V
150µF 35V
2 × 100µF 6.3V
1.8
2 × 10µF 35V
150µF 35V
4 × 100µF 6.3V
1.8
2 × 10µF 35V
150µF 35V
3 × 22µF 6.3V
1.8
2 × 10µF 35V
150µF 35V
1 × 100µF 6.3V
1.8
2 × 10µF 35V
150µF 35V
2 × 100µF 6.3V
1.8
2 × 10µF 35V
150µF 35V
4 × 100µF 6.3V
2.5
2 × 10µF 35V
150µF 35V
1 × 100µF 6.3V
2.5
2 × 10µF 35V
150µF 35V
2 × 100µF 6.3V
2.5
2 × 10µF 35V
150µF 35V
3 × 22µF 6.3V
2.5
2 × 10µF 35V
150µF 35V
4 × 100µF 6.3V
2.5
2 × 10µF 35V
150µF 35V
1 × 100µF 6.3V
2.5
2 × 10µF 35V
150µF 35V
3 × 22µF 6.3V
150µF 35V
2 × 100µF 6.3V
2.5
2 × 10µF 35V
2.5
2 × 10µF 35V
150µF 35V
4 × 100µF 6.3V
2.5
2 × 10µF 35V
150µF 35V
3 × 22µF 6.3V
2.8
2 × 10µF 35V
150µF 35V
3 × 22µF 6.3V
3.3
2 × 10µF 35V
150µF 35V
2 × 100µF 6.3V
3.3
2 × 10µF 35V
150µF 35V
1 × 100µF 6.3V
3.3
2 × 10µF 35V
150µF 35V
3 × 22µF 6.3V
3.3
2 × 10µF 35V
150µF 35V
4 × 100µF 6.3V
3.3
2 × 10µF 35V
150µF 35V
1 × 100µF 6.3V
3.3
2 × 10µF 35V
150µF 35V
3 × 22µF 6.3V
3.3
2 × 10µF 35V
150µF 35V
2 × 100µF 6.3V
3.3
2 × 10µF 35V
150µF 35V
4 × 100µF 6.3V
3.3
2 × 10µF 35V
150µF 35V
3 × 22µF 6.3V
5
2 × 10µF 35V
150µF 35V
4 × 100µF 6.3V
5
2 × 10µF 35V
150µF 35V
4 × 100µF 6.3V
*X7R is recommended for extended temperature range.
12
COUT2
(BULK)
470µF 4V
470µF 2.5V
330µF 6.3V
NONE
470µF 4V
470µF 2.5V
330µF 6.3V
NONE
470µF 4V
470µF 2.5V
330µF 6.3V
NONE
470µF 4V
470µF 2.5V
330µF 6.3V
NONE
470µF 4V
470µF 2.5V
330µF 6.3V
NONE
470µF 4V
470µF 2.5V
330µF 6.3V
NONE
470µF 4V
330µF 6.3V
470µF 4V
NONE
470µF 4V
470µF 4V
330µF 6.3V
NONE
470µF 6.3V
470µF 6.3V
330µF 6.3V
470µF 4V
470µF 4V
NONE
470µF 4V
470µF 4V
330µF 6.3V
NONE
470µF 6.3V
NONE
NONE
COUT2 VENDORS
SANYO POSCAP
SANYO POSCAP
SANYO POSCAP
SANYO POSCAP
CCOMP
C3
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
VIN
(V)
5
5
5
5
12
12
12
12
5
5
5
5
12
12
12
12
5
5
5
5
12
12
12
12
5
5
5
5
12
12
12
12
24
24
7
7
7
7
12
12
12
12
24
15
20
DROOP
(mV)
35
35
40
49
35
35
40
49
36
37
44
61
36
37
44
54
40
44
46
62
40
44
44
62
48
56
57
60
48
51
56
70
56
50
64
66
82
100
52
64
64
76
74
188
159
PART NUMBER
6TPE330MIL (330µF, 6.3V)
2R5TPE470M9 (470µF, 2.5V)
4TPE470MCL (470µF, 4V)
6TPD470M (470µF, 6.3V)
PEAK TO PEAK
(mV)
68
70
80
98
68
70
80
98
75
79
84
118
75
79
89
108
81
88
91
128
81
85
91
125
103
113
116
115
103
102
113
159
112
100
126
132
166
200
106
129
126
144
149
375
320
RECOVERY TIME
(µs)
25
20
20
20
25
20
20
20
25
20
20
20
25
20
20
20
30
20
20
20
30
20
20
20
30
30
30
25
30
30
30
25
30
30
30
30
35
25
30
35
30
25
30
25
25
LOAD STEP
(A/µs)
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
4600hvfe
For more information www.linear.com/LTM4600HV
LTM4600HV
applications information
After the controller has been started and given adequate
time to charge up the output capacitor, CSS is used as a
short-circuit timer. After the RUN/SS pin charges above 4V,
if the output voltage falls below 75% of its regulated value,
then a short-circuit fault is assumed. A 1.8µA current then
begins discharging CSS. If the fault condition persists until
the RUN/SS pin drops to 3.5V, then the controller turns
off both power MOSFETs, shutting down the converter
permanently. The RUN/SS pin must be actively pulled
down to ground in order to restart operation.
The over-current protection timer requires the soft-start
timing capacitor CSS be made large enough to guarantee
that the output is in regulation by the time CSS has reached
the 4V threshold. In general, this will depend upon the size
of the output capacitance, output voltage and load current
characteristic. A minimum external soft-start capacitor
can be estimated from:
CSS _ EXT + 1000pF >
COUT • VOUT
10kV
Generally 0.1µF is more than sufficient.
Since the load current is already limited by the current
mode control and current foldback circuitry during a
short-circuit, over-current latchoff operation is NOT always
needed or desired, especially the output has large amount
of capacitance or the load draw huge current during start
up. The latchoff feature can be overridden by a pull-up
current greater than 5µA but less than 80µA to the RUN/
SS pin. The additional current prevents the discharge of
CSS during a fault and also shortens the soft-start period.
Using a resistor from RUN/SS pin to VIN is a simple solution to defeat latchoff. Any pull-up network must be able to
maintain RUN/SS above 4V maximum latchoff threshold
and overcome the 4µA maximum discharge current. With a
pull-up resistor, the delay before starting is approximately:
VRUN/SS
4V
3.5V
3V
1.5V
SHORT-CIRCUIT
LATCH ARMED
SOFT-START
CLAMPING
OF IL RELEASED
OUTPUT
OVERLOAD
HAPPENS
t
SHORT-CIRCUIT
LATCHOFF
VO
75%VO
t
SWITCHING
STARTS
4600hv F03
Figure 3. RUN/SS Pin Voltage During Startup and
Short-Circuit Protection
VIN
VIN
RRUN/SS
RECOMMENDED VALUES FOR RUN/SS
LTM4600HV
RUN/SS
PGND SGND
VIN
RRUN/SS
4.5V TO 5.5V
10.8V TO 13.8V
24V TO 28V
50k
150k
500k
4600hv F04
Figure 4. Defeat Short-Circuit Latchoff with a Pull-Up
Resistor to VIN
tDELAY = –RRUN/SS • (CSS _ EXT + 1000pF )
⎛
⎞
1.5V
⎟⎟
• ln ⎜⎜1−
V
+
1.2µA
•
R
(
)
⎝
IN
RUN/SS ⎠
Figure 3 shows a conceptual drawing of VRUN during
startup and short-circuit.
4600hvfe
For more information www.linear.com/LTM4600HV
13
LTM4600HV
Applications Information
Enable
EXTVCC Connection
The RUN/SS pin can be driven from logic as shown in
Figure 5. This function allows the LTM4600HV to be
turned on or off remotely. The ON signal can also control
the sequence of the output voltage.
An internal low dropout regulator produces an internal 5V
supply that powers the control circuitry and FET drivers.
Therefore, if the system does not have a 5V power rail,
the LTM4600HV can be directly powered by VIN. The gate
driver current through LDO is about 18mA. The internal
LDO power dissipation can be calculated as:
RUN/SS
PLDO_LOSS = 18mA • (VIN – 5V)
LTM4600HV
ON
PGND SGND
2N7002
4600hv F05
Figure 5. Enable Circuit with External Logic
Output Voltage Tracking
For the applications that require output voltage tracking,
several LTM4600HV modules can be programmed by the
power supply tracking controller such as the LTC2923.
Figure 6 shows a typical schematic with LTC2923. Coincident, ratiometric and offset tracking for VO rising and
falling can be implemented with different sets of resistor
values. See the LTC2923 data sheet for more details.
VIN
5V
Q1
DC/DC
3.3V
VIN
RONB
VCC
GATE
RAMP
ON
RONA
FB1
STATUS
RTA1
SDO
VIN
FB2
LTM4600HV
VOSET
VOUT
RTB2
TRACK2
RTA2
GND
1. EXTVCC grounded. Internal 5V LDO is always powered
from the internal 5V regulator.
2. EXTVCC connected to an external supply. Internal LDO
is shut off. A high efficiency supply compatible with the
MOSFET gate drive requirements (typically 5V) can improve overall efficiency. With this connection, it is always
required that the EXTVCC voltage can not be higher than
VIN pin voltage.
3. EXTVCC is recommended for VIN > 20V
Discontinuous Operation and FCB Pin
VIN
RTB1
TRACK1
1.8V
49.9k
LTC2923
RAMPBUF
VIN
LTM4600HV
VOSET
VOUT
The LTM4600HV also provides an external gate driver
voltage pin EXTVCC. If there is a 5V rail in the system, it
is recommended to connect EXTVCC pin to the external
5V rail. Whenever the EXTVCC pin is above 4.7V, the internal 5V LDO is shut off and an internal 50mA P-channel
switch connects the EXTVCC to internal 5V. Internal 5V is
supplied from EXTVCC until this pin drops below 4.5V. Do
not apply more than 6V to the EXTVCC pin and ensure that
EXTVCC < VIN. The following list summaries the possible
connections for EXTVCC:
1.5V
66.5k
4600hv F06
The FCB pin determines whether the internal bottom
MOSFET remains on when the current reverses. There is
an internal 4.75k pull-down resistor connecting this pin
to ground. The default light load operation mode is forced
continuous (PWM) current mode. This mode provides
minimum output voltage ripple.
Figure 6. Output Voltage Tracking with the LTC2923 Controller
14
4600hvfe
For more information www.linear.com/LTM4600HV
LTM4600HV
applications information
In the application where the light load efficiency is important, tying the FCB pin above 0.6V threshold enables
discontinuous operation where the bottom MOSFET turns
off when inductor current reverses. Therefore, the conduction loss is minimized and light load efficiency is improved.
The penalty is that the controller may skip cycle and the
output voltage ripple increases at light load.
Paralleling Operation with Load Sharing
Two or more LTM4600HV modules can be paralleled to
provide higher than 10A output current. Figure 7 shows
the necessary interconnection between two paralleled
modules. The OPTI-LOOP™ current mode control ensures
good current sharing among modules to balance the thermal stress. The new feedback equation for two or more
LTM4600HVs in parallel is:
VOUT
100k
+RSET
N
= 0.6V •
RSET
VIN
VOUT
LTM4600HV
VOUT
(20AMAX)
PGND COMP VOSET SGND
RSET
The LTM4600HV modules do not provide isolation from VIN
to VOUT. There is no internal fuse. If required, a slow blow
fuse with a rating twice the maximum input current should
be provided to protect each unit from catastrophic failure.
LTM4600HV
The high integration of the LTM4600HV makes the PCB
board layout very simple and easy. However, to optimize
its electrical and thermal performance, some layout considerations are still necessary.
• Use large PCB copper areas for high current path, including VIN, PGND and VOUT. It helps to minimize the
PCB conduction loss and thermal stress
• Place high frequency ceramic input and output capacitors next to the VIN, PGND and VOUT pins to minimize
high frequency noise
COMP VOSET SGND
VIN
Safety Considerations
Layout Checklist/Example
where N is the number of LTM4600HVs in parallel.
VIN
explanation of the analysis for the thermal models, and the
derating curves. Tables 3 and 4 provide a summary of the
equivalent qJA for the noted conditions. These equivalent
qJA parameters are correlated to the measure values, and
improved with air-flow. The case temperature is maintained
at 100°C or below for the derating curves. This allows for
4W maximum power dissipation in the total module with
top and bottom heat sinking, and 2W power dissipation
through the top of the module with an approximate qJC
between 6°C/W to 9°C/W. This equates to a total of 124°C
at the junction of the device.
VOUT
PGND
4600hv F07
Figure 7. Parallel Two µModules with Load Sharing
Thermal Considerations and Output Current Derating
The power loss curves in Figures 8 and 15 can be used
in coordination with the load current derating curves in
Figures 9 to 14, and Figures 16 to 19 for calculating an
approximate qJA for the module with various heat sinking methods. Thermal models are derived from several
temperature measurements at the bench, and thermal
modeling analysis. Application Note 103 provides a detailed
• Place a dedicated power ground layer underneath
the unit
• To minimize the via conduction loss and reduce module
thermal stress, use multiple vias for interconnection
between top layer and other power layers
• Do not put vias directly on pad unless they are capped.
• Use a separated SGND ground copper area for components connected to signal pins. Connect the SGND
to PGND underneath the unit
Figure 20 gives a good example of the recommended layout.
4600hvfe
For more information www.linear.com/LTM4600HV
15
LTM4600HV
Applications Information
18V LOSS
3.0
2.5
12V LOSS
2.0
1.5
5V LOSS
1.0
0.5
0
2
0
4
6
8
OUTPUT CURRENT (A)
9
8
7
6
5
4
10
0 LFM
200 LFM
400 LFM
50
60
80
70
AMBIENT TEMPERATURE (°C)
4600hv F08
6
5
0 LFM
200 LFM
400 LFM
50
55
60 65 70 75 80 85
AMBIENT TEMPERATURE (°C)
9
POWER LOSS (W)
MAXIMUM LOAD CURRENT (A)
4
6
5
0 LFM
200 LFM
400 LFM
4
50
8
7
6
5
4
3
2
0 LFM
200 LFM
400 LFM
1
60
70
80
90
AMBIENT TEMPERATURE (°C)
0
100
40
100
10
4.5
9
3.5
24V LOSS
3.0
2.5
2.0
12V LOSS
1.5
0
VIN = 12V
VOUT = 3.3V
8
7
6
5
4
3
2
0 LFM
200 LFM
400 LFM
1
0
2
4
6
8
OUTPUT CURRENT (A)
4600hv F14
Figure 14. BGA Heat Sink
90
4600hv F13
5.0
0.5
80
90
60
70
AMBIENT TEMPERATURE (°C)
60
80
50
70
AMBIENT TEMPERATURE (°C)
Figure 13. No Heat Sink
1.0
0 LFM
200 LFM
400 LFM
100
VIN = 18V
VOUT = 1.5V
Figure 12. BGA Heat Sink
6
60
70
80
90
AMBIENT TEMPERATURE (°C)
9
4.0
16
50
4600hv F12
VIN = 18V
VOUT = 1.5V
50
0 LFM
200 LFM
400 LFM
10
7
3
90
8
0
5
Figure 10. BGA Heat Sink
8
Figure 11. No Heat Sink
2
6
4600hv F10
VIN = 12V
VOUT = 1.5V
4600hv F11
10
7
4
90
MAXIMUM LOAD CURRENT (A)
7
4
10
MAXIMUM LOAD CURRENT (A)
MAXIMUM LOAD CURRENT (A)
8
8
Figure 9. No Heat Sink
VIN = 12V
VOUT = 1.5V
9
9
VIN = 5V
VOUT = 1.5V
4600hv F09
Figure 8. 1.5V Power Loss Curves
vs Load Current
10
10
VIN = 5V
VOUT = 1.5V
MAXIMUM LOAD CURRENT (A)
MAXIMUM LOAD CURRENT (A)
3.5
POWER LOSS (W)
10
VOUT = 1.5V
4.0
MAXIMUM LOAD CURRENT (A)
4.5
10
0
40
50
60
80
70
AMBIENT TEMPERATURE (°C)
90
4600hv F15
Figure 15. 3.3V Power Loss
Curves vs Load Current
4600hv F16
Figure 16. No Heat Sink
4600hvfe
For more information www.linear.com/LTM4600HV
LTM4600HV
applications information
8
7
6
5
4
0 LFM
200 LFM
400 LFM
40
60
70
80
90
50
AMBIENT TEMPERATURE (°C)
100
VIN = 24V
VOUT = 3.3V TEMPERATURE
DE-RATING
8
6
4
2
0
0 LFM
200 LFM
400 LFM
50
60
80
70
AMBIENT TEMPERATURE (°C)
4600hv F17
Figure 17. BGA Heat Sink
90
10
MAXIMUM LOAD CURRENT (A)
9
10
VIN = 12V
VOUT = 3.3V
MAXIMUM LOAD CURRENT (A)
MAXIMUM LOAD CURRENT (A)
10
0 LFM
200 LFM
400 LFM
9
8
7
6
5 VIN = 24V
VOUT = 3.3V TEMPERATURE
DE-RATING
4
60
70
80
50
AMBIENT TEMPERATURE (°C)
4600hv F18.eps
90
4600hv F19.eps
Figure 18. No Heat Sink
Figure 19. BGA Heat Sink
Table 3. 1.5V Output
DERATING CURVE
VIN (V)
POWER LOSS CURVE
AIR FLOW (LFM)
HEAT SINK
qJA (°C/W)
Figures 9, 11, 13
5, 12, 18
Figure 8
0
None
15.2
Figures 9, 11, 13
5, 12, 18
Figure 8
200
None
14
Figures 9, 11, 13
5, 12, 18
Figure 8
400
None
12
Figures 10, 12, 14
5, 12, 18
Figure 8
0
BGA Heat Sink
13.9
Figures 10, 12, 14
5, 12, 18
Figure 8
200
BGA Heat Sink
11.3
Figures 10, 12, 14
5, 12, 18
Figure 8
400
BGA Heat Sink
10.25
DERATING CURVE
VIN (V)
POWER LOSS CURVE
AIR FLOW (LFM)
HEAT SINK
qJA (°C/W)
Figures 16, 18
12, 24
Figure 15
0
None
15.2
Figures 16, 18
12, 24
Figure 15
200
None
14.6
Figures 16, 18
12, 24
Figure 15
400
None
13.4
Table 4. 3.3V Output
Figures 17, 19
12, 24
Figure 15
0
BGA Heat Sink
13.9
Figures 17, 19
12, 24
Figure 15
200
BGA Heat Sink
11.1
Figures 17, 19
12, 24
Figure 15
400
BGA Heat Sink
10.5
4600hvfe
For more information www.linear.com/LTM4600HV
17
LTM4600HV
Applications Information
VIN
t
(DC) DUTY CYCLE = ON
ts
tOFF
CIN
tON
t
V
DC = ON = OUT
ts
VIN
DC
FREQ =
tON
4602 F25
PERIOD ts
PGND
VOUT
4600hv F20
LOAD
TOP LAYER
Figure 20. Recommended PCB Layout
LTM4600HV Frequency Adjustment
The LTM4600HV is designed to typically operate at 850kHz
across most input and output conditions. The control architecture is constant on time valley mode current control.
The fADJ pin is typically left open or decoupled with an
optional 1000pF capacitor. The switching frequency has
been optimized to maintain constant output ripple over the
operating conditions. The equations for setting the operating frequency are set around a programmable constant on
time. This on time is developed by a programmable current
into an on board 10pF capacitor that establishes a ramp
that is compared to a voltage threshold equal to the output
voltage up to a 2.4V clamp. This ION current is equal to:
ION = (VIN – 0.7V)/110k, with the 110k onboard resistor
from VIN to fADJ. The on time is equal to tON = (VOUT/ION)
• 10pF and tOFF = ts – tON. The frequency is equal to: Freq.
= DC/tON. The ION current is proportional to VIN, and the
regulator duty cycle is inversely proportional to VIN, therefore the step-down regulator will remain relatively constant
frequency as the duty cycle adjustment takes place with
lowering VIN. The on time is proportional to VOUT up to a
2.4V clamp. This will hold frequency relatively constant
with different output voltages up to 2.4V. The regulator
switching period is comprised of the on time and off time
as depicted in the following waveform. The on time is
equal to tON = (VOUT/ION) • 10pF and tOFF = ts – tON. The
frequency is equal to: Frequency = DC/tON).
18
The LTM4600HV has a minimum (tON) on time of 100
nanoseconds and a minimum (tOFF) off time of 400
nanoseconds. The 2.4V clamp on the ramp threshold as
a function of VOUT will cause the switching frequency to
increase by the ratio of VOUT/2.4V for 3.3V and 5V outputs.
This is due to the fact the on time will not increase as VOUT
increases past 2.4V. Therefore, if the nominal switching frequency is 850kHz, then the switching frequency
will increase to ~1.2MHz for 3.3V, and ~1.7MHz for 5V
outputs due to Frequency = (DC/tON) When the switching
frequency increases to 1.2MHz, then the time period tS is
reduced to ~833 nanoseconds and at 1.7MHz the switching
period reduces to ~588 nanoseconds. When higher duty
cycle conversions like 5V to 3.3V and 12V to 5V need to
be accommodated, then the switching frequency can be
lowered to alleviate the violation of the 400ns minimum
off time. Since the total switching period is tS = tON + tOFF,
tOFF will be below the 400ns minimum off time. A resistor
from the fADJ pin to ground can shunt current away from
the on time generator, thus allowing for a longer on time
and a lower switching frequency. 12V to 5V and 5V to
3.3V derivations are explained in the data sheet to lower
switching frequency and accommodate these step-down
conversions.
Equations for setting frequency for 12V to 5V:
ION = (VIN – 0.7V)/110k; ION = 103µA
frequency = (ION/[2.4V • 10pF]) • DC = 1.79MHz;
DC = duty cycle, duty cycle is (VOUT/VIN)
tS = tON + tOFF, tON = on-time, tOFF = off-time of the
switching period; tS = 1/frequency
tOFF must be greater than 400ns, or tS – tON > 400ns.
tON = DC • tS
1MHz frequency or 1µs period is chosen for 12V to 5V.
4600hvfe
For more information www.linear.com/LTM4600HV
LTM4600HV
applications information
tON = 0.41 • 1µs @ 410ns
tOFF must be greater than 400ns, or tS – tON > 400ns.
tOFF = 1µs – 410ns @ 590ns
tON = DC • tS
tON and tOFF are above the minimums with adequate guard
band.
~450kHz frequency or 2.22µs period is chosen for 5V to
3.3V. Frequency range is about 450kHz to 650kHz from
4.5V to 7V input.
Using the frequency = (ION/[2.4V • 10pF]) • DC, solve for
ION = (1MHz • 2.4V • 10pF) • (1/0.41) @ 58µA. ION current
calculated from 12V input was 103µA, so a resistor from
fADJ to ground = (0.7V/15k) = 46µA. 103µA – 46µA =
57µA, sets the adequate ION current for proper frequency
range for the higher duty cycle conversion of 12V to
5V. Input voltage range is limited to 9V to 16V. Higher
input voltages can be used without the 15k on fADJ. The
inductor ripple current gets too high above 16V, and the
400ns minimum off-time is limited below 9V.
Equations for setting frequency for 5V to 3.3V:
ION = (VIN – 0.7V)/110k; ION = 39µA
frequency = (ION/[2.4V • 10pF]) • DC = 1.07MHz;
DC = duty cycle, duty cycle is (VOUT/VIN)
tS = tON + tOFF, tON = on-time, tOFF = off-time of the
switching period; tS = 1/frequency
tON = 0.66 • 2.22µs @ 1.46µs
tOFF = 2.22µs – 1.46µs @ 760ns
tON and tOFF are above the minimums with adequate guard
band.
Using the frequency = (ION/[2.4V • 10pF]) • DC, solve for
ION = (450kHz • 2.4V • 10pF) • (1/0.66) @ 16µA. ION current
calculated from 5V input was 39µA, so a resistor from fADJ
to ground = (0.7V/30.1k) = 23µA. 39µA – 23µA = 16µA,
sets the adequate ION current for proper frequency range
for the higher duty cycle conversion of 5V to 3.3V. Input
voltage range is limited to 4.5V to 7V. Higher input voltages
can be used without the 30.1k on fADJ. The inductor ripple
current gets too high above 7V, and the 400ns minimum
off-time is limited below 4.5V.
5V to 3.3V at 8A
R1
30.1k
4.5V TO 7V
C3
10μF
25V
C1
10μF
25V
VIN
C5
100pF
fADJ
EXTVCC
3.3V AT 8A
VOUT
FCB
VOSET
R2
22.1k
1%
LTM4600HV
RUN/SOFT-START
RUN/SS
SVIN
PGOOD
COMP
SGND
EFFICIENCY = 94%
C2
22μF
+
C4
330μF
6.3V
OPEN DRAIN
PGND
4600 F22
5V TO 3.3V AT 8A WITH fADJ = 30.1k
LTM4600HV MINIMUM ON-TIME = 100ns
LTM4600HV MINIMUM OFF-TIME = 400ns
C1, C3: TDK C3216X5R1E106MT
C2: TAIYO YUDEN, JMK316BJ226ML
C4: SANYO POSCAP, 6TPE330MIL
4600hvfe
For more information www.linear.com/LTM4600HV
19
LTM4600HV
Applications Information
12V to 5V at 8A
R1
15k
9V TO 16V
C1
10μF
25V
VIN
5.0
fADJ
EXTVCC
VOSET
RUN/SS
SVIN
SGND
+
C4
330μF
6.3V
3.5
2.5
2.0
1.0
PGND
3.3V AT 8A
5V AT 8A
0.5
4600 F23
12V TO 5V AT 8A WITH fADJ = 15k
LTM4600HV MINIMUM ON-TIME = 100ns
LTM4600HV MINIMUM OFF-TIME = 400ns
3.0
1.5
OPEN DRAIN
PGOOD
COMP
EFFICIENCY = 94%
C2
22μF
R2
13.7k
1%
LTM4600HV
RUN/SOFT-START
4.0
5V AT 8A
VOUT
FCB
3.3V: fADJ = 30.1k
4.5 5V: fADJ = 15k
C5
100pF
VOUT (V)
C3
10μF
25V
VIN to VOUT Step-Down Ratio for
12V to 5V and 5V to 3.3V
0
C1, C3: TDK C3216X5R1E106MT
C2: TAIYO YUDEN, JMK316BJ226ML
C4: SANYO POSCAP, 6TPE330MIL
1
3
5
7
9 11
VIN (V)
13
15
17
4600 F24
Typical Applications
VIN
+
5V TO 24V
CIN (BULK)
150μF
CIN (CER)
10μF
2x
GND
EXTVCC
C3
100pF
SVIN
VIN
(MULTIPLE PINS)
VOUT
(MULTIPLE PINS)
fADJ
VOSET
VOUT
COMP
LTM4600HV
FCB
COUT1 +
22μF
6.3V
×3
REFER TO
TABLE 2
RUN/SS
PGOOD
VOUT
COUT2
470μF
REFER TO
TABLE 2
0.6V TO 5V
SGND
C4
OPT
REFER TO STEP DOWN
RATIO GRAPH
PGND
(MULTIPLE PINS)
R1
66.5k
REFER TO
TABLE 1
GND
4600HV F21
Figure 21. Typical Application, 5V to 24V Input, 0.6V to 5V Output, 10A Max
20
4600hvfe
For more information www.linear.com/LTM4600HV
LTM4600HV
Typical Applications
Parallel Operation and Load Sharing
4.5V TO 24V
C8
10μF
35V
C7
10μF
35V
VOUT = 0.6V • ([100k/N] + RSET)/RSET
WHERE N = 2
VIN
fADJ
EXTVCC
VOUT
FCB
C9
22μF
x3
VOSET
LTM4600HV
RUN
R4
15.8k
1%
SVIN
+
C10
470μF
4V
PGOOD
COMP
SGND
PGND
2.5V AT 20A
RUN/SOFT-START
C1
10μF
35V
VIN
C4
220pF
fADJ
EXTVCC
2.5V
VOUT
FCB
C2
22μF
x3
VOSET
LTM4600HV
RUN
+
C5
470μF
4V
R1
100k
SVIN
PGOOD
COMP
SGND
PGND
C1, C3, C7, C8: TAIYO YUDEN, GDK316BJ106ML
C2, C9: TAIYO YUDEN, JMK316BJ226ML-T501
C5, C10: SANYO POSCAP, 4TPE470MCL
4600hv TA02
Current Sharing Between Two
LTM4600HV Modules
12
12VIN
2.5VOUT
10 20AMAX
INDIVIDUAL SHARE
C3
10μF
35V
IOUT2
8
IOUT1
6
4
2
0
0
5
10
TOTAL LOAD
15
20
4600hv TA03
4600hvfe
For more information www.linear.com/LTM4600HV
21
5.7150
2.5400
0.3175
0.3175
2.7375
For more information www.linear.com/LTM4600HV
C(0.30)
PAD 1
13.97
BSC
0.11 – 0.27
6.9850
4.4450
1.2700
0.0000
1.4675
4.0075
1
6.9421
1
1
8
12
25
32
32
25
12
8
94
83
72
61
50
39
5.7158
2
3
4
40
3
5
6
41
34
27
7
8
89
78
67
56
45
100
88
77
66
55
44
36
29
15
11
99
35
28
14
10
7
98
87
76
65
54
43
13
9
6
0.0000
37
30
16
10
9
13
43
54
65
76
87
98
11
6
28
35
13
7
29
36
13.93
BSC
12
10
14
44
55
66
77
88
99
12.70
BSC
14
11
15
45
56
67
78
89
100
15
16
30
37
BOTTOM VIEW
9
5
27
26
4
34
33
42
53
52
51
86
97
64
85
96
63
50
1.9058
5
91
102
90
80
69
58
47
101
79
68
57
46
38
31
17
3.1742
18
16
46
57
68
79
90
101
17
17
31
38
18
47
58
69
80
91
102
19
18
SUGGESTED SOLDER PAD LAYOUT
TOP VIEW
62
61
97
86
75
64
53
42
75
73
72
96
85
74
63
52
41
33
26
4.4950
5.7650
4
3.1758
74
84
83
2
95
84
73
62
51
40
1.0900
95
39
4.4458
2.3600
94
6.3500
5.2775
3.8100
6.5475
5.0800
0.6358
1.2700
1.9042
0.3175
0.3175
0.0000
3
2.5400
0.6342
1.2700
2
2.5400
4.4442
3.8100
6.9888
103
92
81
70
59
48
104
93
82
71
60
49
20
48
59
21
22
49
60
71
70
93
104
82
19
19
5.7142
81
92
103
5.0800
23
20
21
22
23
24
24
23
22
21
20
6.9865
6.3500
2.45 – 2.55
A
C
E
G
J
L
M
N
P
R
B
D
F
H
K
4600 02-18
eee M X Y
7
SEE NOTES
PADS
SEE NOTES
T
3
DETAIL B
MOLD
CAP
DETAIL B
4
PAD 1
CORNER
aaa Z
DETAILS OF PAD #1 IDENTIFIER ARE OPTIONAL,
BUT MUST BE LOCATED WITHIN THE ZONE INDICATED.
THE PAD #1 IDENTIFIER IS A MARKED FEATURE OR A
NOTCHED BEVELED PAD
4
7
15
BSC
TOP VIEW
LGA 104 1112 REV C
PACKAGE ROW AND COLUMN LABELING MAY VARY
AMONG µModule PRODUCTS. REVIEW EACH PACKAGE
LAYOUT CAREFULLY
SYMBOL TOLERANCE
aaa
0.15
bbb
0.10
eee
0.15
!
6. THE TOTAL NUMBER OF PADS: 104
5. PRIMARY DATUM -Z- IS SEATING PLANE
LAND DESIGNATION PER JESD MO-222, SPP-010
3
2. ALL DIMENSIONS ARE IN MILLIMETERS
NOTES:
1. DIMENSIONING AND TOLERANCING PER ASME Y14.5M-1994
0.27 – 0.37
SUBSTRATE
2.72 – 2.92
(Reference LTM DWG # 05-05-1800 Rev C)
Z
22
bbb Z
LGA Package
104-Lead (15mm × 15mm × 2.82mm)
X
15
BSC
Y
aaa Z
LTM4600HV
Package Description
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
4600hvfe
LTM4600HV
package description
Pin Assignment Tables
(Arranged by Pin Number)
PIN NAME
A1 A2 A3 VIN
A4 A5 VIN
A6 A7 VIN
A8 A9 VIN
A10 A11 VIN
A12 -
PIN NAME
B1 VIN
B2 B3 B4 B5 B6 B7 B8 B9 B10 B11 -
PIN NAME
C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 VIN
C11 -
PIN NAME
D1 VIN
D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 -
PIN NAME
E1 E2 E3 E4 E5 E6 E7 E8 E9 E10 VIN
E11 -
PIN NAME
F1 VIN
F2 F3 F4 F5 F6 F7 F8 F9 F10 F11 -
PIN NAME
G1 PGND
G2 G3 G4 G5 G6 G7 G8 G9 G10 G11 -
PIN NAME
H1 H2 H3 H4 H5 H6 H7 PGND
H8 H9 PGND
H10 H11 PGND
A13 VIN
A14 A15 fADJ
A16 A17 SVIN
A18 A19 EXTVCC
A20 A21 VOSET
A22 A23 -
B12 B13 B14 B15 B16 B17 B18 B19 B20 B21 B22 B23 COMP
C12 VIN
C13 C14 VIN
C15 C16 C17 C18 C19 C20 C21 C22 C23 -
D12 D13 D14 D15 D16 D17 D18 D19 D20 D21 D22 D23 SGND
E12 VIN
E13 E14 VIN
E15 E16 E17 E18 E19 E20 E21 E22 E23 -
F12 F13 F14 F15 F16 F17 F18 F19 F20 F21 F22 F23 RUN/SS
G12 G13 G14 G15 G16 G17 G18 G19 G20 G21 G22 G23 FCB
H12 H13 PGND
H14 H15 PGND
H16 H17 PGND
H18 H19 H20 H21 H22 H23 -
PIN NAME
J1 PGND
J2 J3 J4 J5 J6 J7 J8 J9 J10 J11 J12 J13 J14 J15 J16 J17 J18 J19 J20 J21 J22 J23 PGOOD
PIN NAME
K1 K2 K3 K4 K5 K6 K7 PGND
K8
K9 PGND
K10
K11 PGND
K12 K13 PGND
K14 K15 PGND
K16 K17 PGND
K18 K19 K20 K21 K22 K23 -
PIN NAME
L1 L2 PGND
L3 L4 PGND
L5 L6 PGND
L7 L8 PGND
L9 L10 PGND
L11 L12 PGND
L13 L14 PGND
L15 L16 PGND
L17 L18 PGND
L19 L20 PGND
L21 L22 PGND
L23 -
PIN NAME
M1 M2 PGND
M3 M4 PGND
M5 M6 PGND
M7 M8 PGND
M9 M10 PGND
M11 M12 PGND
M13 M14 PGND
M15 M16 PGND
M17 M18 PGND
M19 M20 PGND
M21 M22 PGND
M23 -
PIN NAME
N1 N2 PGND
N3 N4 PGND
N5 N6 PGND
N7 N8 PGND
N9 N10 PGND
N11 N12 PGND
N13 N14 PGND
N15 N16 PGND
N17 N18 PGND
N19 N20 PGND
N21 N22 PGND
N23 -
PIN NAME
P1 P2 VOUT
P3 P4 VOUT
P5 P6 VOUT
P7 P8 VOUT
P9 P10 VOUT
P11 P12 VOUT
P13 P14 VOUT
P15 P16 VOUT
P17 P18 VOUT
P19 P20 VOUT
P21 P22 VOUT
P23 -
PIN NAME
R1 R2 VOUT
R3 R4 VOUT
R5 R6 VOUT
R7 R8 VOUT
R9 R10 VOUT
R11 R12 VOUT
R13 R14 VOUT
R15 R16 VOUT
R17 R18 VOUT
R19 R20 VOUT
R21 R22 VOUT
R23 -
PIN NAME
T1 T2 VOUT
T3 T4 VOUT
T5 T6 VOUT
T7 T8 VOUT
T9 T10 VOUT
T11 T12 VOUT
T13 T14 VOUT
T15 T16 VOUT
T17 T18 VOUT
T19 T20 VOUT
T21 T22 VOUT
T23 4600hvfe
For more information www.linear.com/LTM4600HV
23
LTM4600HV
package description
Pin Assignment Tables
(Arranged by Pin Number)
PIN NAME
24
G1
PGND
H7
H9
H11
H13
H15
H17
PGND
PGND
PGND
PGND
PGND
PGND
J1
PGND
K7
K9
K11
K13
K15
K17
PGND
PGND
PGND
PGND
PGND
PGND
L2
L4
L6
L8
L10
L12
L14
L16
L18
L20
L22
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
M2
M4
M6
M8
M10
M12
M14
M16
M18
M20
M22
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
N2
N4
N6
N8
N10
N12
N14
N16
N18
N20
N22
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PIN NAME
P2
P4
P6
P8
P10
P12
P14
P16
P18
P20
P22
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
R2
R4
R6
R8
R10
R12
R14
R16
R18
R20
R22
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
T2
T4
T6
T8
T10
T12
T14
T16
T18
T20
T22
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
PIN NAME
PIN NAME
A3
A5
A7
A9
A11
A13
VIN
VIN
VIN
VIN
VIN
VIN
B1
VIN
C10
C12
C14
VIN
VIN
VIN
D1
VIN
E10
E12
E14
VIN
VIN
VIN
F1
VIN
A15
fADJ
A17
SVIN
A19
EXTVCC
A21
VOSET
B23
COMP
D23
SGND
F23
RUN/SS
G23
FCB
J23
PGOOD
4600hvfe
For more information www.linear.com/LTM4600HV
LTM4600HV
Revision History
(Revision history begins at Rev E)
REV
DATE
DESCRIPTION
E
5/14
Added reflow temperature.
PAGE NUMBER
2
Updated the Order Table.
2
Updated Notes.
4
Updated the Soft-Start and Latchoff section.
11, 13
4600hvfe
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection
of information
its circuits as described
herein will not infringe on existing patent rights.
For more
www.linear.com/LTM4600HV
25
LTM4600HV
Typical Application
1.8V, 10A Regulator
4.5V TO 22V
C2
10μF
35V
C1
10μF
35V
VIN
C5
100pF
fADJ
EXTVCC
1.8V AT 10A
VOUT
FCB
VOSET
R1
100k
LTM4600HV
RUN
SVIN
SGND
PGND
4600hv TA04
+
C4
470μF
4V
PGOOD
PGOOD
COMP
C3
22μF
x3
R2
49.9k
1%
C1, C2: TAIYO YUDEN, GDK316BJ106ML
C3: TAIYO YUDEN, JMK316BJ226ML-T501
C4: SANYO POSCAP, 4TPE470MCL
Related Parts
PART NUMBER DESCRIPTION
COMMENTS
LTM4649
16VIN, 10A Step-Down μModule Regulator
4.5V ≤ VIN ≤ 16V, 0.6V ≤ VOUT ≤ 3.3V, PLL Input, Remote Sense Amplifier, VOUT
tracking, 9mm × 15mm x 4.92mm BGA
LTM4641
38VIN, 10A Step-Down μModule Regulator
with Advanced Input & Load Protection
4.5V ≤ VIN ≤ 38V, 0.6V ≤ VOUT ≤ 6V, Adjustable Protection Trip Thresholds for Many
Faults: (Output Overvoltage, Input Overvoltage, Input Undervoltage, Overtemperature),
15mm × 15mm × 5.01mm BGA
LTM4633
Triple 10A, 16VIN Step-Down DC/DC μModule 4.7V ≤ VIN ≤ 16V, 0.8V ≤ VOUT1,2 ≤ 1.8V, 0.8V ≤ VOUT3 ≤ 5.5V, PLL input, VOUT Soft-Start
Regulator
and Tracking, PGOOD, Internal Temperature Monitor, 15mm × 15mm × 5.01mm BGA
LTM4627
20VIN, 15A DC/DC Step-Down μModule
Regulator
LTM4611
1.5VIN(MIN), 15A DC/DC Step-Down μModule 1.5V ≤ VIN ≤ 5.5V, 0.8V ≤ VOUT ≤ 5V, PLL Input, Remote Sense Amplifier, VOUT Tracking,
Regulator
15mm × 15mm × 4.32mm LGA
LTM4613
36VIN, 8A EN55022 Class B DC/DC
Step-Down μModule Regulator
LTM8061
32V, 2A Step-Down μModule Battery Charger Compatible with Single Cell or Dual Cell Li-Ion or Li-Poly Battery Stacks (4.1V, 4.2V,
with Programmable Input Current Limit
8.2V, or 8.4V), 4.95V ≤ VIN ≤ 32V, C/10 or Adjustable Timer Charge Termination, NTC
Resistor Monitor Input, 9mm × 15mm × 4.32mm LGA
LTM8045
Inverting or SEPIC μModule DC/DC
Converter with Up to 700mA Output Current
LTM8048
1.5W, 725VDC Galvanically Isolated µModule 3.1V ≤ VIN ≤ 32V, 2.5V ≤ VOUT ≤ 12V, 1mVP-P Output Ripple, Internal Isolated
Transformer, 9mm × 11.25mm × 4.92mm BGA
Converter with LDO Post Regulator
LTC2977
8-Channel PMBus Power System Manager
0.25% TUE 16-Bit ADC, Voltage/Temperature Monitoring and Supervision
LTC2974
4-Channel PMBus Power System Manager
0.25% TUE 16-Bit ADC, Voltage/Current/Temperature Monitoring and Supervision
4.5V ≤ VIN ≤ 20V, 0.6V ≤ VOUT ≤ 5V, PLL Input, VOUT Tracking, Remote Sense Amplifier,
15mm × 15mm × 4.32mm LGA or 15mm × 15mm × 4.92mm BGA
5V ≤ VIN ≤ 36V, 3.3V ≤ VOUT ≤ 15V, PLL Input, VOUT Tracking and Margining, 15mm ×
15mm × 4.32mm LGA
2.8V ≤ VIN ≤ 18V, ±2.5V ≤ VOUT ≤ ±15V, Synchronizable, No Derating or Logic Level Shift
for Control Inputs When Inverting, 6.25mm × 11.25mm × 4.92mm BGA
This product contains technology licensed from Silicon Semiconductor Corporation.
26 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
For more information www.linear.com/LTM4600HV
(408) 432-1900 ● FAX: (408) 434-0507
●
www.linear.com/LTM4600HV
®
4600hvfe
LT 0514 REV E • PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 2005
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