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TPS562209, TPS563209
SLVSCM5A – SEPTEMBER 2014 – REVISED NOVEMBER 2016
TPS56x209, 4.5V to 17 V Input, 2-A, 3-A Synchronous Step-Down Voltage Regulator in
6 pin SOT-23
1 Features
3 Description
•
The TPS562209 and TPS563209 are simple, easy-touse, 2-A and 3-A synchronous step-down converters
in 6 pin SOT-23 package.
1
•
•
•
•
•
•
•
•
•
•
•
•
TPS562209 - 2A converter with integrated
122-mΩ and 72-mΩ FETs
TPS563209 - 3A converter with integrated 68-mΩ
and 39-mΩ FETs
D-CAP2™ Mode Control for Fast Transient
Response
Input Voltage Range: 4.5 V to 17 V
Output Voltage Range: 0.76 V to 7 V
650 kHz Switching Frequency
Low Shutdown Current Less than 10µA
1% Feedback Voltage Accuracy (25°C)
Startup from Pre-Biased Output Voltage
Cycle By Cycle Over-current Limit
Hiccup-mode Under Voltage Protection
Non-latch OVP, UVLO and TSD Protections
Fixed Soft Start : 1.0ms
2 Applications
•
•
•
•
The devices are optimized to operate with minimum
external component counts and also optimized to
achieve low standby current.
These switch mode power supply (SMPS) devices
employ D-CAP2™ mode control providing a fast
transient response and supporting both low
equivalent series resistance (ESR) output capacitors
such as specialty polymer and ultra-low ESR ceramic
capacitors
with
no
external
compensation
components.
TPS562209 and TPS563209 always operate in
continuous conduction mode, which reduces the
output ripple voltage in light load compared to
discontinous conduction mode. TPS56x209 are
available in a 6-pin 1.6 × 2.9(mm) SOT (DDC)
package, and specified from –40°C to 150°C of
junction temperature.
Device Information(1)
Digital TV Power Supply
High Definition Blu-ray Disc™ Players
Networking Home Terminal
Digital Set Top Box (STB)
PART NUMBER
PACKAGE
TPS563209,
TPS562209
SOT (6)
BODY SIZE (NOM)
1.60 mm × 2.90 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
spacer
spacer
Simplified Schematic
Transient Response
TPS563209
TPS562209
1
2
VOUT
VIN
3
GND
SW
VIN
VBST
EN
VFB
6
5
4
VO = 50 mV / div (ac coupled)
EN
VOUT
IO = 1 A / div
Copyright © 2016, Texas Instruments Incorporated
Load step = 0.75 A - 2.25 A
Slew rate = 500 mA / µsec
Time = 200 µsec / div
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
TPS562209, TPS563209
SLVSCM5A – SEPTEMBER 2014 – REVISED NOVEMBER 2016
www.ti.com
Table of Contents
1
2
3
4
5
6
7
Features ..................................................................
Applications ...........................................................
Description .............................................................
Revision History.....................................................
Pin Configuration and Functions .........................
Specifications.........................................................
1
1
1
2
3
4
6.1
6.2
6.3
6.4
6.5
6.6
6.7
4
4
4
4
5
6
8
Absolute Maximum Ratings ......................................
ESD Ratings ............................................................
Recommended Operating Conditions.......................
Thermal Information ..................................................
Electrical Characteristics...........................................
Typical Characteristics TPS562209..........................
Typical Characteristics TPS563209..........................
Detailed Description ............................................ 10
7.1 Overview ................................................................. 10
7.2 Functional Block Diagram ...................................... 10
7.3 Feature Description................................................. 11
7.4 Device Functional Modes........................................ 12
8
Application and Implementation ........................ 13
8.1 Application Information............................................ 13
8.2 Typical Applications ............................................... 13
9 Power Supply Recommendations...................... 20
10 Layout................................................................... 21
10.1 Layout Guidelines ................................................. 21
10.2 Layout Example .................................................... 21
11 Device and Documentation Support ................. 22
11.1
11.2
11.3
11.4
11.5
11.6
Related Links ........................................................
Receiving Notification of Documentation Updates
Community Resources..........................................
Trademarks ...........................................................
Electrostatic Discharge Caution ............................
Glossary ................................................................
22
22
22
22
22
22
12 Mechanical, Packaging, and Orderable
Information ........................................................... 22
4 Revision History
Changes from Original (September 2014) to Revision A
Page
•
Updated the Pinout image in Pin Configuration and Functions ............................................................................................. 3
•
Changed the "Handling Ratings" table to the ESD Ratings table .......................................................................................... 4
•
Changed RθJB for TPS562209 From: 57.3 To: 13.4 in Thermal Information .......................................................................... 4
•
The Adaptive On-Time Control and PWM Operation, changed text From: "proportional to the converter input
voltage, VIN, and inversely proportional to the output voltage, VO" To: "inversely proportional to the converter input
voltage, VIN, and proportional to the output voltage, VO"...................................................................................................... 11
2
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SLVSCM5A – SEPTEMBER 2014 – REVISED NOVEMBER 2016
5 Pin Configuration and Functions
DDC Package
6 Pin (SOT)
Top View
GND
1
6
VBST
SW
2
5
EN
VIN
3
4
VFB
Pin Functions
PIN
NAME
DESCRIPTION
NO.
GND
1
Ground pin Source terminal of low-side power NFET as well as the ground terminal for controller circuit. Connect
sensitive VFB to this GND at a single point.
SW
2
Switch node connection between high-side NFET and low-side NFET.
VIN
3
Input voltage supply pin. The drain terminal of high-side power NFET.
VFB
4
Converter feedback input. Connect to output voltage with feedback resistor divider.
EN
5
Enable input control. Active high and must be pulled up to enable the device.
VBST
6
Supply input for the high-side NFET gate drive circuit. Connect 0.1 µF capacitor between VBST and SW pins.
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SLVSCM5A – SEPTEMBER 2014 – REVISED NOVEMBER 2016
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6 Specifications
6.1 Absolute Maximum Ratings
TJ = –40°C to 150°C (unless otherwise noted)
(1)
MIN
MAX
UNIT
VIN, EN
–0.3
19
V
VBST
–0.3
25
V
VBST (10 ns transient)
–0.3
27.5
V
VBST (vs SW)
–0.3
6.5
V
VFB,
–0.3
6.5
V
–2
19
V
–3.5
21
V
Operating junction temperature, TJ
–40
150
°C
Storage temperature, Tstg
–55
150
°C
Input voltage range
SW
SW (10 ns transient)
(1)
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
6.2 ESD Ratings
MIN
V(ESD)
(1)
(2)
Electrostatic discharge
MAX
Human body model (HBM), per ANSI/ESDA/JEDEC JS-001, all
pins (1)
2
Charged device model (CDM), per JEDEC specification JESD22C101, all pins (2)
UNIT
kV
500
V
JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.
6.3 Recommended Operating Conditions
TJ = -40°C to 150°C (unless otherwise noted)
VIN
VI
MIN
MAX
Supply input voltage range
4.5
17
VBST
–0.1
23
VBST (10 ns transient)
–0.1
26
VBST(vs SW)
–0.1
6.0
Input voltage range EN
TA
–0.1
17
VFB
–0.1
5.5
SW
–1.8
17
SW (10 ns transient)
–3.5
20
–40
85
Operating free-air temperature
UNIT
V
V
°C
6.4 Thermal Information
THERMAL METRIC (1)
TPS562209
TPS563209
DDC (6 PINS)
RθJA
Junction-to-ambient thermal resistance
109.2
87.9
RθJC(top)
Junction-to-case (top) thermal resistance
44.5
42.2
RθJB
Junction-to-board thermal resistance
13.4
13.6
ψJT
Junction-to-top characterization parameter
2.3
1.9
ψJB
Junction-to-board characterization parameter
60.4
13.3
(1)
4
UNIT
°C/W
For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.
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SLVSCM5A – SEPTEMBER 2014 – REVISED NOVEMBER 2016
6.5 Electrical Characteristics
TJ = -40°C to 150°C, VIN = 12V (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP MAX
UNIT
SUPPLY CURRENT
IVIN
Operating – non-switching supply current
VIN current, TA = 25°C, EN = 5V, VFB = 0.8 V
650
900
IVINSDN
Shutdown supply current
VIN current, TA = 25°C, EN = 0 V
3.0
10
µA
µA
µA
LOGIC THRESHOLD
VENH
EN high-level input voltage
EN
VENL
EN low-level input voltage
EN
1.6
REN
EN pin resistance to GND
VEN = 12 V
225
758
V
0.6
V
450
900
kΩ
765
772
mV
0
±0.1
mA
VFB VOLTAGE AND DISCHARGE RESISTANCE
VFBTH
VFB threshold voltage
TA = 25°C, VO = 1.05 V, continuous mode
operation
IVFB
VFB input current
VFB = 0.8V, TA = 25°C
MOSFET
RDS(on)h
High side switch resistance
RDS(on)l
Low side switch resistance
TA = 25°C, VBST – SW = 5.5 V (TPS562209)
122
TA = 25°C, VBST – SW = 5.5 V (TPS563209)
68
TA = 25°C (TPS562209)
72
TA = 25°C (TPS563209)
39
mΩ
mΩ
CURRENT LIMIT
Current limit (1)
Iocl
DC current, VOUT = 1.05V , L1 = 2.2 µH
2.5
3.2
4.3
DC current, VOUT = 1.05V , L1 = 1.5 µH
3.5
4.2
5.3
A
THERMAL SHUTDOWN
TSDN
Shutdown temperature
Thermal shutdown threshold (1)
155
Hysteresis
°C
35
ON-TIME TIMER CONTROL
tON
On time
VIN = 12 V, VO = 1.05 V
150
tOFF(MIN)
Minimum off time
TA = 25°C, VFB = 0.5 V
260
310
ns
ns
1.0
1.3
ms
SOFT START
Tss
Soft –start time
Internal soft-start time, TA = 25°C
0.7
OUTPUT UNDERVOLTAGE AND OVERVOLTAGE PROTECTION
125%x
Vfbth
VOVP
Output OVP threshold
OVP Detect
VUVP
Output UVP threshold
Hiccup detect
THiccupOn
Hiccup Power On Time
Relative to soft start time
1
ms
THiccupOff
Hiccup Power Off Time
Relative to soft start time
7
ms
65%xVf
bth
UVLO
UVLO
(1)
UVLO threshold
Wake up VIN voltage
3.45
3.75
4.05
Hysteresis VIN voltage
0.13
0.32
0.55
V
Not production tested.
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6.6 Typical Characteristics TPS562209
VIN = 12V (unless otherwise noted)
6
800
IVCCSHDN - Supply Current (PA)
ICC - Supply Current (PA)
700
600
500
400
300
200
100
0
-50
0
50
100
Junction Temperature (qC)
4
3
2
1
0
-50
150
0.775
50
EN Input Current (PA)
60
0.770
0.765
0.760
150
D002
40
30
20
10
0
0.750
-50
-10
0
50
100
Junction Temperature (qC)
150
0
3
6
9
12
EN Input Voltage (V)
D003
Figure 3. VFB Voltage vs Junction Temperature
100
100
90
90
80
80
70
70
60
50
40
30
15
18
D004
Figure 4. EN Current vs EN Voltage
Efficiency (%)
Efficiency (%)
50
100
Junction Temperature (qC)
Figure 2. VIN Shutdown Current vs Junction Temperature
0.780
0.755
60
50
40
30
20
20
VOUT = 5V
VOUT = 3.3V
VOUT = 1.8V
10
VOUT = 3.3V
VOUT = 1.8V
10
0
0
0
0.25
0.5
0.75
1
1.25
Output Current (A)
1.5
1.75
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2
0
0.25
0.5
D005
Figure 5. Efficiency vs Output Current
6
0
D001
Figure 1. Supply Current vs Junction Temperature
VFB Voltage (V)
5
0.75
1
1.25
Output Current (A)
1.5
1.75
2
D006
Figure 6. Efficiency vs Output current (VI = 5 V)
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SLVSCM5A – SEPTEMBER 2014 – REVISED NOVEMBER 2016
Typical Characteristics TPS562209 (continued)
VIN = 12V (unless otherwise noted)
800
FSW - Switching Frequency (kHz)
3.0
IO - Output Current (A)
2.5
2.0
1.5
1.0
VO = 0.76 V to 3.3 V
VO = 5 V
VO = 7 V
0.5
750
700
650
600
VO = 1.05V
VO = 1.2V
VO = 1.8V
VO = 3.3V
VO = 5V
550
500
0.0
0
25
50
75
Ambient Temperature (qC)
100
4
6
8
10
12
Input Voltage (V)
D007
Figure 7. Output Current vs Ambient Temperature
14
16
18
D008
Figure 8. Switching Frequency vs Input Voltage
FSW - Switching Frequency (kHz)
900
VO = 1.05V
VO = 1.8V
VO = 3.3V
850
800
750
700
650
600
550
500
0
0.5
1
IO - Output Current (A)
1.5
2
D009
Figure 9. Switching Frequency vs Output Current
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6.7 Typical Characteristics TPS563209
VIN = 12V (unless otherwise noted)
800
6
IVCCSHDN - Supply Current (PA)
ICC - Supply Current (PA)
700
600
500
400
300
200
100
0
-50
0
50
100
Junction Temperature (qC)
4
3
2
1
0
-50
150
Figure 10. Supply Current vs Junction Temperature
150
D011
60
50
EN Input Current (PA)
0.770
0.765
0.760
0.755
40
30
20
10
0
-10
0.750
-50
0
50
100
Junction Temperature (qC)
0
150
3
6
9
12
EN Input Voltage (V)
D012
100
90
90
80
80
70
70
Efficiency (%)
100
60
50
40
15
18
D013
Figure 13. EN Current vs EN Voltage
Figure 12. VFB Voltage vs Junction Temperature
Efficiency (%)
50
100
Junction Temperature (qC)
Figure 11. VIN Shutdown Current vs Junction Temperature
0.775
60
50
40
30
30
20
20
VOUT = 5V
VOUT = 3.3V
VOUT = 1.8V
10
VOUT = 3.3V
VOUT = 1.8V
10
0
0
0
0.5
1
1.5
2
Output Current (A)
2.5
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3
0
0.5
D014
Figure 14. Efficiency vs Output Current
8
0
D010
0.780
VFB Voltage (V)
5
1
1.5
2
Output Current (A)
2.5
3
D015
Figure 15. Efficiency vs Output current (VI = 5 V)
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SLVSCM5A – SEPTEMBER 2014 – REVISED NOVEMBER 2016
Typical Characteristics TPS563209 (continued)
VIN = 12V (unless otherwise noted)
800
4.0
FSW - Switching Frequency (kHz)
IO - Output Current (A)
3.5
3.0
2.5
2.0
1.5
1.0
VO = 0.76 V to 3.3 V
VO = 5 V
VO = 7 V
0.5
750
700
650
600
VO = 0.76V
VO = 1.05V
VO = 6.5V
550
500
0.0
0
25
50
75
Ambient Temperature (qC)
100
4
6
8
10
12
Input Voltage (V)
D016
Figure 16. Output Current vs Ambient Temperature
14
16
18
D017
Figure 17. Switching Frequency vs Input Voltage
FSW - Switching Frequency (kHz)
900
VO = 0.76V
VO = 1.05V
VO = 6.5V
850
800
750
700
650
600
550
500
0
0.5
1
1.5
2
IO - Output Current (A)
2.5
3
D018
Figure 18. Switching Frequency vs Output Current
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7 Detailed Description
7.1 Overview
The TPS562209 and TPS563209 are 2-A and 3-A synchronous step-down converters, respectively. The
proprietary D-CAP2™ mode control supports low ESR output capacitors such as specialty polymer capacitors
and multi-layer ceramic capacitors without complex external compensation circuits. The fast transient response
of D-CAP2™ mode control can reduce the output capacitance required to meet a specific level of performance.
7.2 Functional Block Diagram
EN
5
VUVP
VOVP
+
UVP
Hiccup
Control Logic
Ref
Soft Start
SS
+
+
6
VBST
2
SW
1
GND
UVLO
VFB 4
Voltage
Reference
VIN
VREG5
Regulator
+
OVP
3
PWM
HS
Ton
One-Shot
XCON
VREG5
TSD
OCL
threshold
LS
OCL
+
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Figure 19. TPS56x209
10
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7.3 Feature Description
7.3.1 The Adaptive On-Time Control and PWM Operation
The main control loop of the TPS56x209 are adaptive on-time pulse width modulation (PWM) controller that
supports a proprietary D-CAP2™ mode control. The D-CAP2™ mode control combines adaptive on-time control
with an internal compensation circuit for pseudo-fixed frequency and low external component count configuration
with both low ESR and ceramic output capacitors. It is stable even with virtually no ripple at the output.
At the beginning of each cycle, the high-side MOSFET is turned on. This MOSFET is turned off after internal one
shot timer expires. This one shot duration is set inversely proportional to the converter input voltage, VIN, and
proportional to the output voltage, VO, to maintain a pseudo-fixed frequency over the input voltage range, hence
it is called adaptive on-time control. The one-shot timer is reset and the high-side MOSFET is turned on again
when the feedback voltage falls below the reference voltage. An internal ramp is added to reference voltage to
simulate output ripple, eliminating the need for ESR induced output ripple from D-CAP2™ mode control.
7.3.2 Soft Start and Pre-Biased Soft Start
The TPS562209 and TPS563209 have an internal 1.0ms soft-start. When the EN pin becomes high, the internal
soft-start function begins ramping up the reference voltage to the PWM comparator.
If the output capacitor is pre-biased at startup, the devices initiate switching and start ramping up only after the
internal reference voltage becomes greater than the feedback voltage VFB. This scheme ensures that the
converters ramp up smoothly into regulation point.
7.3.3 Current Protection
The output over-current limit (OCL) is implemented using a cycle-by-cycle valley detect control circuit. The switch
current is monitored during the OFF state by measuring the low-side FET drain to source voltage. This voltage is
proportional to the switch current. To improve accuracy, the voltage sensing is temperature compensated. During
the on time of the high-side FET switch, the switch current increases at a linear rate determined by Vin, Vout, the
on-time and the output inductor value.
During the on time of the low-side FET switch, this current decreases linearly. The average value of the switch
current is the load current Iout. If the monitored current is above the OCL level, the converter maintains low-side
FET on and delays the creation of a new set pulse, even the voltage feedback loop requires one, until the current
level becomes OCL level or lower. In subsequent switching cycles, the on-time is set to a fixed value and the
current is monitored in the same manner. If the over current condition exists consecutive switching cycles, the
internal OCL threshold is set to a lower level, reducing the available output current. When a switching cycle
occurs where the switch current is not above the lower OCL threshold, the counter is reset and the OCL
threshold is returned to the higher value.
There are some important considerations for this type of over-current protection. The load current is higher than
the over-current threshold by one half of the peak-to-peak inductor ripple current. Also, when the current is being
limited, the output voltage tends to fall as the demanded load current may be higher than the current available
from the converter. This may cause the output voltage to fall. When the VFB voltage falls below the UVP
threshold voltage, the UVP comparator detects it. And then, the device will shut down after the UVP delay time
(typically 14µs) and re-start after the hiccup time (typically 12ms).
When the over current condition is removed, the output voltage returns to the regulated value.
7.3.4 Over Voltage Protection
TPS562209 and TPS563209 detect over voltage condition by monitoring the feedback voltage (VFB). When the
feedback voltage becomes higher than 125% of the target voltage, the OVP comparator output goes high and
both the high-side MOSFET and the low-side MOSFET turn off. This function is non-latch operation.
7.3.5 UVLO Protection
Under voltage lock out protection (UVLO) monitors the device input voltage. When the voltage is lower than
UVLO threshold voltage, the device is shut off. This protection is non-latching.
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Feature Description (continued)
7.3.6 Thermal Shutdown
The device monitors the temperature of itself. If the temperature exceeds the threshold value (typically 155°C),
the device is shut off. This is a non-latch protection.
7.4 Device Functional Modes
7.4.1 Normal Operation
When the input voltage is above the UVLO threshold and the EN voltage is above the enable threshold, the
TPS562209 and TPS563209 can operate in their normal switching modes. Normal continuous conduction mode
(CCM) occurs when the minimum switch current is above 0 A. In CCM, the TPS562209 and TPS563209 operate
at a quasi-fixed frequency of 650 kHz.
7.4.2 Forced CCM Operation
When the TPS562209 and TPS563209 are in the normal CCM operating mode and the switch current falls below
0 A, the TPS562209 and TPS563209 begin operating in forced CCM.
7.4.3 Standby Operation
When the TPS562209 and TPS563209 are operating in either normal CCM or forced CCM, they may be placed
in standby by asserting the EN pin low.
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8 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
The TPS562209 and TPS563209 are typically used as step down converters, which convert a voltage from 4.5V
- 17V to a lower voltage. Webench software is available to aid in the design and analysis of circuits
8.2 Typical Applications
8.2.1 TPS562209 4.5-V to 17-V Input, 1.05-V Output Converter
U1
TPS562209
VIN = 4.5 V to 17 V
3
VIN
R1 10.0k
C1
10µF
C2
10µF
C3
EN
5
4
VIN
SW
EN
VBST
VFB
GND
L1
2.2 uH
VOUT = 1.05 V, 2 A
2
VOUT
C4
R2
3.74k
6
1
0.1µF
C5
22µF
C6
22µF
R3
10.0k
Not Installed
Copyright © 2016, Texas Instruments Incorporated
Figure 20. TPS562209 1.05V/2A Reference Design
8.2.1.1 Design Requirements
To begin the design process, you must know a few application parameters:
Table 1. Design Parameters
PARAMETER
VALUE
Input voltage range
4.5 V to 17 V
Output voltage
1.05 V
Output current
2A
Output voltage ripple
20 mVpp
8.2.1.2 Detailed Design Procedure
8.2.1.2.1 Output Voltage Resistors Selection
The output voltage is set with a resistor divider from the output node to the VFB pin. It is recommended to use
1% tolerance or better divider resistors. Start by using Equation 1 to calculate VOUT.
To improve efficiency at very light loads consider using larger value resistors, too high of resistance will be more
susceptible to noise and voltage errors from the VFB input current will be more noticeable.
æ R2 ö
VOUT = 0.765 ´ ç 1 +
÷
è R3 ø
(1)
8.2.1.2.2 Output Filter Selection
The LC filter used as the output filter has double pole at:
1
FP =
2p LOUT ´ COUT
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At low frequencies, the overall loop gain is set by the output set-point resistor divider network and the internal
gain of the device. The low frequency phase is 180 degrees. At the output filter pole frequency, the gain rolls off
at a –40 dB per decade rate and the phase drops rapidly. D-CAP2™ introduces a high frequency zero that
reduces the gain roll off to –20 dB per decade and increases the phase to 90 degrees one decade above the
zero frequency. The inductor and capacitor for the output filter must be selected so that the double pole of
Equation 2 is located below the high frequency zero but close enough that the phase boost provided be the high
frequency zero provides adequate phase margin for a stable circuit. To meet this requirement use the values
recommended in Table 2.
Table 2. Recommended Component Values
OUTPUT
VOLTAGE
(V)
R2
(kΩ)
R3
(kΩ)
L1 (µH)
MIN
TYP
MAX
C5 + C6 (µF)
1
3.09
10.0
1.5
2.2
4.7
20 - 68
1.05
3.74
10.0
1.5
2.2
4.7
20 - 68
1.2
5.76
10.0
1.5
2.2
4.7
20 - 68
1.5
9.53
10.0
1.5
2.2
4.7
20 - 68
1.8
13.7
10.0
1.5
2.2
4.7
20 - 68
2.5
22.6
10.0
2.2
3.3
4.7
20 - 68
3.3
33.2
10.0
2.2
3.3
4.7
20 - 68
5
54.9
10.0
3.3
4.7
4.7
20 - 68
6.5
75
10.0
3.3
4.7
4.7
20 - 68
The inductor peak-to-peak ripple current, peak current and RMS current are calculated using Equation 3,
Equation 4 and Equation 5. The inductor saturation current rating must be greater than the calculated peak
current and the RMS or heating current rating must be greater than the calculated RMS current.
Use 650 kHz for fSW. Make sure the chosen inductor is rated for the peak current of Equation 4 and the RMS
current of Equation 5.
VIN(MAX) - VOUT
VOUT
´
IlP -P =
VIN(MAX)
LO ´ ƒSW
(3)
IlPEAK = IO +
IlP -P
2
ILO(RMS) = IO2 +
(4)
1
IlP -P2
12
(5)
For this design example, the calculated peak current is 2.34 A and the calculated RMS current is 2.01 A. The
inductor used is a TDK CLF7045T-2R2N with a peak current rating of 5.5-A and an RMS current rating of 4.3-A
The capacitor value and ESR determines the amount of output voltage ripple. The TPS562209 is intended for
use with ceramic or other low ESR capacitors. Recommended values range from 20µF to 68µF. Use Equation 6
to determine the required RMS current rating for the output capacitor.
ICO(RMS) =
VOUT ´ (VIN - VOUT )
12 ´ VIN ´ LO ´ ƒSW
(6)
For this design two TDK C3216X5R0J226M 22µF output capacitors are used. The typical ESR is 2 mΩ each.
The calculated RMS current is 0.199A and each output capacitor is rated for 4A.
8.2.1.2.3 Input Capacitor Selection
The TPS562209 and TPS563209 require an input decoupling capacitor and a bulk capacitor is needed
depending on the application. A ceramic capacitor over 10 µF is recommended for the decoupling capacitor. An
additional 0.1 µF capacitor (C3) from pin 3 to ground is optional to provide additional high frequency filtering. The
capacitor voltage rating needs to be greater than the maximum input voltage.
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8.2.1.2.4 Bootstrap Capacitor Selection
A 0.1µF ceramic capacitor must be connected between the VBST to SW pin for proper operation. It is
recommended to use a ceramic capacitor.
100
100
90
90
80
80
70
70
Efficiency (%)
Efficiency (%)
8.2.1.3 Application Curves
60
50
40
30
60
50
40
30
20
20
VIN = 5V
VIN = 12V
10
0
0
0.5
1
Output Current (A)
1.5
VIN = 5V
VIN = 12V
10
0
0.001
2
Figure 21. TPS562209 Efficiency
1
1
0.8
0.8
0.6
0.6
0.4
0.2
0
-0.2
-0.4
1
2 3 45
D025
0.4
0.2
0
-0.2
-0.4
-0.6
-0.6
-0.8
-0.8
-1
-1
0
0.5
1
Output Current (A)
1.5
2
0
0.5
D026
Figure 23. TPS562209 Load Regulation, VI = 5 V
1
Output Current (A)
1.5
2
D027
Figure 24. TPS562209 Load Regulation, VI = 12 V
0.5
IO = 2 A
0.4
VI = 100 mV / div (ac coupled)
0.3
Line Regulation (%)
0.5
Figure 22. TPS562209 Light Load Efficiency
Load Regulation (%)
Load Regulation (%)
0.01 0.02 0.05 0.1 0.2
Output Current (A)
D024
0.2
0.1
0
SW = 5 V / div
-0.1
-0.2
-0.3
-0.4
-0.5
4
6
8
10
12
Input Voltage (V)
14
16
18
D028
Figure 25. TPS562209 Line Regulation
Time = 1 µsec / div
Figure 26. TPS562209 Input Voltage Ripple
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IO = 2 A
VO = 20 mV / div (ac coupled)
VO = 20 mV / div (ac coupled)
IO = 500 mA / div
SW = 5 V / div
Load step = 0.5 A - 1.5 A
Slew rate = 500 mA / µsec
Time = 1 µsec / div
Figure 27. TPS562209 Output Voltage Ripple
Time = 200 µsec / div
Figure 28. TPS562209 Transient Response
VI = 10 V / div
VI = 10 V / div
EN = 10 V / div
EN = 10 V / div
VO = 500 mV / div
VO = 500 mV / div
Time = 2 msec / div
Figure 29. TPS562209 Start Up Relative to VI
VI = 10 V / div
VI = 10 V / div
EN = 10 V / div
EN = 10 V / div
VO = 500 mV / div
VO = 500 mV / div
Time = 2 msec / div
Figure 31. TPS562209 Shut Down Relative to VI
16
Time = 2 msec / div
Figure 30. TPS562209 Start Up Relative to EN
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Time = 2 msec / div
Figure 32. TPS562209 Shut Down Relative to EN
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8.2.2 TPS563209 4.5-V to 17-V Input, 1.05-V Output Converter
U1
TPS563209
3
VIN
R1 10.0k
C1
10µF
C2
10µF
L1
1.5 uH
VOUT = 1.05 V, 3 A
VIN = 4.5 V to 17 V
C3
0.1µF
EN
5
4
VIN
SW
EN
VBST
VFB
GND
2
VOUT
C4
R2
3.74k
6
1
C5
22µF
0.1µF
C6
22µF
C7
22µF
R3
10.0k
Copyright © 2016, Texas Instruments Incorporated
Figure 33. TPS563209 1.05V/3A Reference Design
8.2.2.1 Design Requirements
To begin the design process, the user must know a few application parameters:
Table 3. Design Parameters
PARAMETER
VALUE
Input voltage range
4.5 V to 17 V
Output voltage
1.05 V
Output current
3A
Output voltage ripple
20 mVpp
8.2.2.2 Detailed Design Procedures
The detailed design procedure for TPS563209 is the same as for TPS562209 except for inductor selection.
8.2.2.2.1 Output Filter Selection
Table 4. Recommended Component Values
OUTPUT
VOLTAGE
(V)
R2
(kΩ)
R3
(kΩ)
L1 (µH)
MIN
TYP
MAX
C5 +C6 + C7
(µF)
1
3.09
10.0
1.0
1.5
4.7
20 - 68
1.05
3.74
10.0
1.0
1.5
4.7
20 - 68
1.2
5.76
10.0
1.0
1.5
4.7
20 - 68
1.5
9.53
10.0
1.0
1.5
4.7
20 - 68
1.8
13.7
10.0
1.5
2.2
4.7
20 - 68
2.5
22.6
10.0
1.5
2.2
4.7
20 - 68
3.3
33.2
10.0
1.5
2.2
4.7
20 - 68
5
54.9
10.0
2.2
3.3
4.7
20 - 68
6.5
75
10.0
2.2
3.3
4.7
20 - 68
The inductor peak-to-peak ripple current, peak current and RMS current are calculated using Equation 7,
Equation 8 and Equation 9. The inductor saturation current rating must be greater than the calculated peak
current and the RMS or heating current rating must be greater than the calculated RMS current. Use 650 kHz for
ƒSW.
Use 650 kHz for ƒSW. Make sure the chosen inductor is rated for the peak current of Equation 8 and the RMS
current of Equation 9.
VIN(MAX) - VOUT
VOUT
´
IlP -P =
VIN(MAX)
LO ´ ƒSW
(7)
IlPEAK = IO +
IlP -P
2
(8)
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ILO(RMS) = IO2 +
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1
IlP -P2
12
(9)
For this design example, the calculated peak current is 3.505 A and the calculated RMS current is 3.014 A. The
inductor used is a TDK CLF7045T-1R5N with a peak current rating of 7.3-A and an RMS current rating of 4.9-A
The capacitor value and ESR determines the amount of output voltage ripple. The TPS563209 is intended for
use with ceramic or other low ESR capacitors. Recommended values range from 20µF to 68µF. Use Equation 6
to determine the required RMS current rating for the output capacitor.
ICO(RMS) =
VOUT ´ (VIN - VOUT )
12 ´ VIN ´ LO ´ ƒSW
(10)
For this design three TDK C3216X5R0J226M 22µF output capacitors are used. The typical ESR is 2 mΩ each.
The calculated RMS current is 0.292A and each output capacitor is rated for 4A.
100
100
90
90
80
80
70
70
Efficiency (%)
Efficiency (%)
8.2.2.3 Application Curves
60
50
40
30
60
50
40
30
20
20
VIN = 5V
VIN = 12V
10
0
0
0.5
1
1.5
2
Output Current (A)
2.5
VIN = 5V
VIN = 12V
10
0
0.001
3
0.5
1
2 3 45
D020
Figure 35. TPS563209 Light Load Efficiency
1
1
0.8
0.8
0.6
0.6
Load Regulation (%)
Load Regulation (%)
Figure 34. TPS563209 Efficiency
0.4
0.2
0
-0.2
-0.4
0.4
0.2
0
-0.2
-0.4
-0.6
-0.6
-0.8
-0.8
-1
-1
0
0.5
1
1.5
2
Output Current (A)
2.5
3
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0
0.5
D021
Figure 36. TPS563209 Load Regulation, VI = 5 V
18
0.01 0.02 0.05 0.1 0.2
Output Current (A)
D019
1
1.5
2
Output Current (A)
2.5
3
D022
Figure 37. TPS563209 Load Regulation, VI = 12 V
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0.5
IO = 3 A
0.4
VI = 50 mV / div (ac coupled)
Line Regulation (%)
0.3
0.2
0.1
0
SW = 5 V / div
-0.1
-0.2
-0.3
-0.4
-0.5
4
6
8
10
12
Input Voltage (V)
14
16
18
D029
Figure 38. TPS563209 Line Regulation
Time = 1 µsec / div
Figure 39. TPS563209 Input Voltage Ripple
IO = 3 A
VO = 20 mV / div (ac coupled)
VO = 50 mV / div (ac coupled)
SW = 5 V / div
IO = 1 A / div
Load step = 0.75 A - 2.25 A
Slew rate = 500 mA / µsec
Time = 1 µsec / div
Figure 40. TPS563209 Output Voltage Ripple
Time = 200 µsec / div
Figure 41. TPS563209 Transient Response
VI = 10 V / div
VI = 10 V / div
EN = 10 V / div
EN = 10 V / div
VO = 500 mV / div
VO = 500 mV / div
Time = 1 msec / div
Figure 42. TPS563209 Start Up Relative to VI
Time = 1 msec / div
Figure 43. TPS563209 Start Up Relative to EN
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VI = 10 V / div
VI = 10 V / div
EN = 10 V / div
EN = 10 V / div
VO = 500 mV / div
VO = 500 mV / div
Time = 1 msec / div
Figure 44. TPS563209 Shut Down Relative to VI
Time = 1 msec / div
Figure 45. TPS563209 Shut Down Relative to EN
9 Power Supply Recommendations
The TPS562209 and TPS563209 are designed to operate from input supply voltage in the range of 4.5V to 17V.
Buck converters require the input voltage to be higher than the output voltage for proper operation. The
maximum recommended operating duty cycle is 65%. Using that criteria, the minimum recommended input
voltage is VO / 0.65.
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10 Layout
10.1 Layout Guidelines
1. VIN and GND traces should be as wide as possible to reduce trace impedance. The wide areas are also of
advantage from the view point of heat dissipation.
2. The input capacitor and output capacitor should be placed as close to the device as possible to minimize
trace impedance.
3. Provide sufficient vias for the input capacitor and output capacitor.
4. Keep the SW trace as physically short and wide as practical to minimize radiated emissions.
5. Do not allow switching current to flow under the device.
6. A separate VOUT path should be connected to the upper feedback resistor.
7. Make a Kelvin connection to the GND pin for the feedback path.
8. Voltage feedback loop should be placed away from the high-voltage switching trace, and preferably has
ground shield.
9. The trace of the VFB node should be as small as possible to avoid noise coupling.
10. The GND trace between the output capacitor and the GND pin should be as wide as possible to minimize its
trace impedance.
10.2 Layout Example
VOUT
GND
OUTPUT
CAPACITOR
Additional
Vias to the
GND plane
Vias to the
internal SW
node copper
BOOST
CAPACITOR
OUTPUT
INDUCTOR
GND
SW
Vias to the
internal SW
node copper
VIN
VIN
VBST
EN
TO ENABLE
CONTROL
FEEDBACK
RESISTORS
VFB
INPUT BYPAS
CAPACITOR
SW node copper
pour area on internal
or bottom layer
Figure 46. TPS562209 and TPS563209 Layout
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11 Device and Documentation Support
11.1 Related Links
The table below lists quick access links. Categories include technical documents, support and community
resources, tools and software, and quick access to sample or buy.
Table 5. Related Links
PARTS
PRODUCT FOLDER
SAMPLE & BUY
TECHNICAL
DOCUMENTS
TOOLS &
SOFTWARE
SUPPORT &
COMMUNITY
TPS563209
Click here
Click here
Click here
Click here
Click here
TPS562209
Click here
Click here
Click here
Click here
Click here
11.2 Receiving Notification of Documentation Updates
To receive notification of documentation updates, navigate to the device product folder on ti.com. In the upper
right corner, click on Alert me to register and receive a weekly digest of any product information that has
changed. For change details, review the revision history included in any revised document.
11.3 Community Resources
The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective
contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of
Use.
TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration
among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help
solve problems with fellow engineers.
Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and
contact information for technical support.
11.4 Trademarks
D-CAP2, E2E are trademarks of Texas Instruments.
Blu-ray Disc is a trademark of Blu-ray Disc Association.
11.5 Electrostatic Discharge Caution
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
11.6 Glossary
SLYZ022 — TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.
12 Mechanical, Packaging, and Orderable Information
The following pages include mechanical, packaging, and orderable information. This information is the most
current data available for the designated devices. This data is subject to change without notice and revision of
this document. For browser-based versions of this data sheet, refer to the left-hand navigation.
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PACKAGE OPTION ADDENDUM
www.ti.com
6-Oct-2017
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
Lead/Ball Finish
MSL Peak Temp
(2)
(6)
(3)
Op Temp (°C)
Device Marking
(4/5)
TPS562209DDCR
ACTIVE
SOT-23-THIN
DDC
6
3000
Green (RoHS
& no Sb/Br)
CU SN
Level-1-260C-UNLIM
-40 to 125
209
TPS562209DDCT
ACTIVE
SOT-23-THIN
DDC
6
250
Green (RoHS
& no Sb/Br)
CU SN
Level-1-260C-UNLIM
-40 to 125
209
TPS563209DDCR
ACTIVE
SOT-23-THIN
DDC
6
3000
Green (RoHS
& no Sb/Br)
CU SN
Level-1-260C-UNLIM
-40 to 125
309
TPS563209DDCT
ACTIVE
SOT-23-THIN
DDC
6
250
Green (RoHS
& no Sb/Br)
CU SN
Level-1-260C-UNLIM
-40 to 125
309
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of
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