Texas Instruments TPS51120 Datasheet
High Performance
Synchronous Buck EVM
TPS51120 User’s Guide
SLUU240A – JANUARY 2006 – REVISED FEBRUARY 2006
Using the TPS51120
User’s Guide
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TPS51120 User’s Guide
SLUU240 – JANUARY 2006
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TPS51120 User’s Guide
SLUU240A – JANUARY 2006 – REVISED FEBRUARY 2006
CONTENTS
1. Description ·················································································································4
2. Electrical Performance Specifications·····································································5
3. Schematic···················································································································6
4. Test Setup and Results ·····························································································7
5. Configuration ·············································································································7
6. EVM Assembly Drawing and PCB layout·································································8
7. List of Materials··········································································································9
8. References··················································································································10
1. Description
The TPS51120 is a highly sophisticated dual current mode synchronous step-down controller. It is a
full featured controller designed to run directly off three to four-cell Li-ion battery and provide high
power and 5V and/or 3.3V standby regulation for all the downstream circuitry in a notebook
computer system. High current, 100-mA, 5-V or 3.3-V on-board linear regulators have glitch-free
switch over function to SMPS and can be kept alive independently during standby state. The
pseudo-constant frequency adaptive on-time control scheme supports full range of current mode
operation including simplified loop compensation, ceramic output capacitors as well as seamless
transition to reduced frequency operation at light-load condition. Optional D-CAP™ mode operation
optimized for SP-CAP or POSCAP output capacitors allows further reduction of external
compensation parts.
TPS51120EVM-001 evaluation module is a high efficiency, dual synchronous buck conve rter providing 5 V at
6 A and 3.3 V at 6 A from 8 V to 25 V input. This user’s guide describes the TPS51120EVM-001 performance
in
D-CAP™ mode and R
current sensing.
DS(on)
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TPS51120 User’s Guide
SLUU240 – JANUARY 2006
2. ELECTRICAL PERFORMANCE
Table1. Electrical Performance
SPECIFICATIONS TEST CONDITIONS MIN TYP MAX UNIT
Input voltage range (VBAT) 8 12 25 V
CH1 Output voltage 5 V
Operating frequency TONSEL : VREF2
280 kHz
VBAT=12V, Iout1=6A
Output current VBAT: 8V to 25V 6 A
Over current limit VBAT=12V 10 A
Output ripple voltage VBAT=12V, Iout1=6A 40 mVp-p
CH2 Output voltage 3.3 V
Operating frequency TONSEL : VREF2
430 kHz
VBAT=12V, Iout2=6A
Output current VBAT: 8V to 25V 6 A
Over current limit VBAT=12V 10 A
Output ripple voltage VBAT=12V, Iout2=6A 45 mVp-p
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3. Schematic
TPS51120 User’s Guide
SLUU240A – JANUARY 2006 – REVISED FEBRUARY 2006
Figure 1. TPS51120 EVM schematic diagram
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