SGM6609
High Current Synchronous Step-Up Converter
with Adjustable Current Limit
GENERAL DESCRIPTION
FEATURES
The SGM6609 is a high current, synchronous step-up
● 2.4V to 5.0V Input Voltage Range
converter with programmable low-side MOSFET peak
● Adjustable 3.0V to 5.0V Output Voltage
current limit of 500mA to 3.5A. It is ideal for preventing
● Programmable NMOS Peak Current Limit:
input current from overloading system power in PCI-E
card applications based on WCDMA/Edge/GPRS/
TD-SCDMA, PCI-E card GSM high load pulse
500mA to 3.5A
● Synchronous Boost Rectification and Internal
Compensation
applications. With a suitable ultra-cap or super-cap, the
● 1.2MHz Switching Frequency
SGM6609 ensures that output voltage meets load
● Reverse Current Blocking
power requirements when large load pulses are applied.
● True Load Disconnect in Shutdown
It is also ideal for CDMA/Evdo-A/Evdo-B and other
● Up to 95%Efficiency
industry modem continuous load current applications.
● Power-Good Indication
The output voltage of the SGM6609 is programmed
from 3.0V to 5.0V by an external resistive divider.
Optimized
internal
compensation
provides
fast
transient response with no external components. Light
● Programmable Over-Voltage Protection
● Over-Temperature and Short-Circuit Protection
● Available in Green TDFN-3×3-12L Package
● -40℃ to +85℃ Operating Temperature Range
load switching frequency modulation and low quiescent
current maintains high efficiency performance for light
load mode conditions.
APPLICATIONS
The low-side power MOSFET peak current limit of
PC Cards (PCMCIA) Modems
500mA to 3.5A is set via an external resistor to protect
PCI-E Modem Cards
the system power from overload.
WCDMA/Edge/GPRS/TD-SCDMA
Reverse blocking is integrated to prevent current from
flowing back to the input. The SGM6609's true load
disconnect function isolates the output from the input
CDMA/Evdo-A/Evdo-B
Industry Modems
USB Modems
when the device is disabled. Output over-voltage,
short-circuit, and over-temperature protection are also
integrated to protect the SGM6609 from these fault
conditions.
The SGM6609 is available in Green TDFN-3×3-12L
package and is rated over the -40 ℃ to +85 ℃
temperature range.
SG Micro Corp
www.sg-micro.com
REV. A
High Current Synchronous Step-Up Converter
with Adjustable Current Limit
SGM6609
PACKAGE/ORDERING INFORMATION
MODEL
PACKAGE
DESCRIPTION
SPECIFIED
TEMPERATURE
RANGE
ORDERING
NUMBER
MARKING
INFORMATION
PACKING
OPTION
SGM6609
TDFN-3×3-12L
-40℃ to +85℃
SGM6609YTDF12G/TR
SGM
6609DF
XXXXX
Tape and Reel, 4000
NOTE: XXXXX = Date Code and Vendor Code.
Green (RoHS & HSF): SG Micro Corp defines "Green" to mean Pb-Free (RoHS compatible) and free of halogen substances. If
you have additional comments or questions, please contact your SGMICRO representative directly.
ABSOLUTE MAXIMUM RATINGS
ESD SENSITIVITY CAUTION
Input Supply Voltage Range ................................ -0.3V to 6V
Supply Voltage on SW, VOUT, EN, FB, PG
This integrated circuit can be damaged by ESD if you don’t
pay attention to ESD protection. SGMICRO recommends that
all integrated circuits be handled with appropriate precautions.
Failure to observe proper handling and installation
procedures can cause damage. ESD damage can range from
subtle performance degradation to complete device failure.
Precision integrated circuits may be more susceptible to
damage because very small parametric changes could cause
the device not to meet its published specifications.
............................................................................. -0.3V to 6V
PGND to AGND ................................................ -0.3V to 0.3V
Package Thermal Resistance
TDFN-3×3-12L, θJA ................................................. 52.1℃/W
Junction Temperature ...................................................150℃
Storage Temperature Range ....................... -65℃ to +150℃
Lead Temperature (Soldering, 10s) ..............................260℃
ESD Susceptibility
HBM............................................................................. 4000V
MM................................................................................. 200V
RECOMMENDED OPERATING CONDITIONS
DISCLAIMER
SG Micro Corp reserves the right to make any change in
circuit design, specification or other related things if
necessary without notice at any time
Input Voltage Range ...........................................2.4V to 5.0V
Operating Temperature Range .......................-40℃ to +85℃
OVERSTRESS CAUTION
Stresses beyond those listed may cause permanent damage
to the device. Functional operation of the device at these or
any other conditions beyond those indicated in the
operational section of the specification is not implied.
Exposure to absolute maximum rating conditions for
extended periods may affect reliability.
SG Micro Corp
www.sg-micro.com
2
High Current Synchronous Step-Up Converter
with Adjustable Current Limit
SGM6609
PIN CONFIGURATION
(TOP VIEW)
SW
1
12
PGND
SW
2
11
PGND
EN
3
10
VOUT
IN
4
9
ISET
OVP
5
8
FB
PG
6
7
AGND
GND
TDFN-3×3-12L
PIN DESCRIPTION
PIN
NAME
FUNCTION
1, 2
SW
Switching Node Tied to Drain of Internal N-Channel MOSFET and Source of Internal
P-Channel MOSFET. Connect this pin to the external power inductor.
3
EN
Input Enable Pin. Logic high to enable the boost. Logic low to disable the IC.
4
IN
Input Voltage. Supplies the IC at startup.
5
OVP
6
PG
7
AGND
8
FB
9
ISET
10
VOUT
11, 12
PGND
Exposed
Pad
GND
Over-Voltage Protection Pin. This pin is connected to an external resistor divider to set the
over voltage threshold. To disable the over voltage feature, short this pin to ground.
Power-Good Signal (Active Low). PG is an open-drain, active-low output. PG is pulled low
when the feedback voltage exceeds 95% of the target voltage.
Non-Power Signal Ground Pin.
Feedback Input Pin. This pin is connected to an external resistor divider which programs the
output voltage with feedback voltage of 0.6V.
Peak Current Limit Programmable Input. An external resistor from ISET to ground is adopted
to program the low-side MOSFET peak current limit between 500mA and 3.5A.
Boost Converter Output Voltage. This pin is connected to the P-Channel synchronous
MOSFET source. Bypass with ceramic capacitor to GND.
Power Ground. PGND is internally connected to the source of the low-side N-Channel
MOSFET.
Power Ground Exposed Pad. Must be connected to ground plane.
SG Micro Corp
www.sg-micro.com
3
High Current Synchronous Step-Up Converter
with Adjustable Current Limit
SGM6609
ELECTRICAL CHARACTERISTICS
(VIN = 3.3V, VOUT = 3.8V, L = 2.2μH, AGND = PGND, TA = +25℃, unless otherwise noted.)
PARAMETER
Input Voltage Range
Minimum Start-Up Voltage
SYMBOL
VOUT
Input Under-Voltage Lockout
VUVLO
Quiescent Supply Current
IQ
Shutdown Supply Current
ISHDN
Feedback Accuracy
VFB
Feedback Leakage Current
IFB
Load Regulation
ΔVOUT/IOUT
Line Regulation
Output Over-Voltage Protection
Threshold
Switching Frequency
ΔVOUT/VIN
Minimum On-Time
MIN
TYP
2.4
VIN(MIN)
Output Voltage Range
Maximum Duty Cycle
CONDITIONS
VIN
MAX
UNITS
5.0
V
2.3
3.0
VIN Rising, Hysteresis = 0.2V
2.15
No-Load Current; Not Switching
V
5.0
V
2.25
2.35
V
50
70
μA
1
μA
VEN = GND, VIN = 5.0V
TA = +25℃, VFB = 600mV
-2
+2
TA = -40℃ to +85℃, VFB = 600mV
-3
+3
VFB = 0 to 1.0V
VIN = 3.3V, VOUT = 3.8V,
0 to 2.5A Load
VIN = 2.4V to VOUT, IOUT = 10mA
-1
+1
VOVP
0.55
%
μA
1
%/A
0.3
%/V
0.60
0.65
V
fSW
1.2
MHz
D
90
%
tON(MIN)
80
ns
High-side P-Channel On-Resistance
RON(PMOS)
140
mΩ
Low-side N-Channel On-Resistance
RON(NMOS)
80
mΩ
Low-side Peak Current Limit Threshold
ILIMPK
TA = +25℃, RSET = 60.4kΩ
1.9
2.55
3.2
A
ENABLE, POWER-GOOD AND START-UP FEATURES
Logic Input Threshold High for EN
VIH
Logic Input Threshold Low for EN
VIL
EN Input Low Current
IEN
Power-Good Threshold
1.5
VEN = GND or 5.0V
-1
V
0.01
0.4
V
4
μA
FB Rising, Hysteresis = 10%
95
%
R PG
VFB = 0.62V, ISINK = 10μA
450
Ω
Over-Temperature Shutdown Threshold
TSD
Temperature Rising
150
℃
Over-Temperature Shutdown Hysteresis
THYS
20
℃
PG On-Resistance
THERMAL
SG Micro Corp
www.sg-micro.com
4
High Current Synchronous Step-Up Converter
with Adjustable Current Limit
SGM6609
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 3.3V, VOUT = 3.8V, L = 2.2μH, AGND = PGND, TA = +25℃, unless otherwise noted.
Quiescent Current vs. Temperature
Quiescent Current vs. Input Voltage
70
70
Open Loop
Open Loop
65
Quiescent Current (μA)
Quiescent Current (μA)
65
60
55
50
45
40
60
TA = 85℃
55
50
TA = 25℃
45
40
TA = -40℃
35
35
30
30
-50
-25
0
25
50
Temperature (℃)
75
100
2.4
2.7
1.3
1.2
1.2
1.1
1.1
V IH
1.0
0.9
0.8
4.5
4.8
5.1
4.8
5.1
VIH
1.0
0.9
VIL
0.8
V IL
0.7
0.7
0.6
0.6
-50
-25
0
25
50
75
100
2.4
2.7
3
Temperature ( ℃)
Feedback Voltage vs. Temperature
3.3 3.6 3.9 4.2
Input Voltage (V)
4.5
Feedback Voltage vs. Input Voltage
0.609
0.609
0.606
0.606
Feedback Voltage (V)
Feedback Voltage (V)
3.3 3.6 3.9 4.2
Input Voltage (V)
Enable Threshold vs. Input Voltage
1.3
VEN (V)
V EN (V)
Enable Threshold vs. Temperature
3
0.603
0.600
0.597
0.594
0.603
0.600
0.597
0.594
0.591
0.591
-50
-25
0
25
50
Temperature (℃)
SG Micro Corp
www.sg-micro.com
75
100
2.4
2.7
3
3.3 3.6 3.9 4.2
Input Voltage (V)
4.5
4.8
5.1
5
High Current Synchronous Step-Up Converter
with Adjustable Current Limit
SGM6609
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 3.3V, VOUT = 3.8V, L = 2.2μH, AGND = PGND, TA = +25℃, unless otherwise noted.
Load Regulation
1.0
0.5
0.5
Output Error (%)
Output Error (%)
Load Regulation
1.0
0.0
-0.5
-1.0
VIN = 2.4V
VIN = 2.7V
VIN = 3.0V
VIN = 3.3V
-1.5
VOUT = 3.8V
0.0
-0.5
-1.5
VOUT = 5.0V
-2.0
-2.0
0.1
1
10
100
1000
0.1
10000
1
Output Current (mA)
90
90
80
80
70
70
Efficiency (%)
100
60
50
40
VOUT = 3.3V
10
1000
10000
60
50
40
VIN = 2.4V
VIN = 2.7V
VIN = 3.0V
VIN = 3.3V
30
VIN = 2.4V
VIN = 2.7V
VIN = 3.0V
20
100
Efficiency vs. Output Current
100
30
10
Output Current (mA)
Efficiency vs. Output Current
Efficiency (%)
VIN = 2.4V
VIN = 2.7V
VIN = 3.0V
VIN = 3.3V
VIN = 4.2V
-1.0
20
VOUT = 3.8V
10
0
0
0.1
1
10
100
1000
Output Current (mA)
0.1
10000
Efficiency vs. Output Current
1
10
100
1000
Output Current (mA)
10000
Switching Frequency vs. Temperature
1280
100
Switching Frequency (kHz)
90
Efficiency (%)
80
70
60
50
VIN = 2.4V
VIN = 2.7V
VIN = 3.0V
VIN = 3.3V
VIN = 4.2V
40
30
20
VOUT = 5.0V
10
1240
1200
1160
1120
1080
0
0.1
1
10
100
1000
Output Current (mA)
SG Micro Corp
www.sg-micro.com
10000
-50
-25
0
25
50
Temperature (℃)
75
100
6
High Current Synchronous Step-Up Converter
with Adjustable Current Limit
SGM6609
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 3.3V, VOUT = 3.8V, L = 2.2μH, AGND = PGND, TA = +25℃, unless otherwise noted.
RDS(ON)_N vs. Input Voltage
110
170
100
TA = 85℃
150
130
RDS(ON)_N (mΩ)
RDS(ON)_P (mΩ)
RDS(ON)_P vs. Input Voltage
190
TA = 25℃
110
TA = 85℃
90
80
TA = 25℃
70
TA = -40℃
90
TA = -40℃
60
70
50
2.4
2.7
3
3.3 3.6 3.9 4.2
Input Voltage (V)
4.5
4.8
5.1
2.4
Output Ripple
3.3 3.6 3.9 4.2
Input Voltage (V)
4.5
4.8
VIN = 3.3V, VOUT = 3.8V, IOUT = 1mA
ISW
AC Coupled
VOUT
AC Coupled
Time (400ns/div)
Time (100μs/div)
Load Transient Response
Line Transient Response
VIN = 2.8V to 3.4V
VOUT = 3.8V, IOUT = 0.3A
VOUT
200mV/div
AC Coupled
200mV/div
VIN = 3.3V, VOUT = 3.8V
VOUT
50mV/div
20mV/div
VOUT
5.1
200mA/div
ISW
3
Output Ripple
200mA/div
VIN = 3.3V, VOUT = 3.8V, IOUT = 500mA
2.7
500mV/div
200mA/div
VIN
IOUT
IOUT = 50mA to 500mA
Time (100μs/div)
SG Micro Corp
www.sg-micro.com
Time (400μs/div)
7
High Current Synchronous Step-Up Converter
with Adjustable Current Limit
SGM6609
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 3.3V, VOUT = 3.8V, L = 2.2μH, AGND = PGND, TA = +25℃, unless otherwise noted.
Soft Start
2V/div
2V/div
VEN
VOUT
VIN = 3.6V, VOUT = 5V
IOUT = 100mA
500mA/div
IIN
Time (200μs/div)
SG Micro Corp
www.sg-micro.com
8
High Current Synchronous Step-Up Converter
with Adjustable Current Limit
SGM6609
TYPICAL APPLICATIONS
L
2.2μH
VIN
2.4V to 5.0V
RPG
100kΩ
CIN
10μF
10kΩ
ON
VOUT
High Load Plus
OUT
PG
OFF
SW
IN
RFB1
SGM6609
CFF
6.8pF
COUT1
22μF
FB
COUT2
UltraCap
or SuperCap
RFB2
EN
OVP
RSET
PGND
ISET
AGND
L
2.2μH
VIN
2.4V to 5.0V
RPG
100kΩ
CIN
10μF
OFF
VOUT
Continuous Load
OUT
PG
ON
SW
IN
10kΩ
RFB1
SGM6609
CFF
6.8pF
COUT
22μF
FB
RFB2
EN
OVP
RSET
ISET
SG Micro Corp
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PGND
AGND
9
High Current Synchronous Step-Up Converter
with Adjustable Current Limit
SGM6609
FUNCTIONAL BLOCK DIAGRAM
VOUT
IN
Over-Temperature
Protection
UVLO
Internal Power
Select
DH
Reverse
Current Block
When Enabled
True Load
Disconnect
Control Logic
Start-Up PMOS
Current Control
Mode
Control
OVP
EN
NMOS
Current
Control
ISET
PMOS
COMP
OVP
SW
0.575V
NMOS
Slope
Compensation
DL
PGND
SG Micro Corp
www.sg-micro.com
PG
0.6V
Error
Amp.
FB
AGND
10
SGM6609
High Current Synchronous Step-Up Converter
with Adjustable Current Limit
OPERATION
The SGM6609 synchronous step-up converter is
targeted for PC card GSM/GPRS/3G and WiMax
modem card applications. It includes a current limit to
ensure fast, controlled startup and continuous
operation with the PCMCIA specifications.
The high 1.2MHz switching frequency of the SGM6609
facilitates output filter component size reduction for
improved power density and reduced overall footprint. It
also provides greater bandwidth and improved
transient response over other lower frequency step-up
converters. The compensation is integrated with three
external components CIN, COUT and L. Low RDS(ON)
synchronous power switches provide high efficiency for
heavy load conditions. Switching frequency modulation
and low quiescent current maintains high efficiency for
light load mode conditions. In addition to the improved
efficiency, the synchronous step-up has the added
performance advantage of true load disconnect during
shutdown (
