Texas Instruments TPS51125AEVM, Руководство пользователя

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1 Introduction
The TPS51125A is a cost effective, dual-synchronous buck controller targeted for notebook system power
supply solutions. It provides 5-V and 3.3-V LDOs and requires few external components. The 270-kHz VCLK
output can be used to drive an external charge pump, generating gate drive voltage for the load switches without
reducing the efficiency of the main converter. The TPS51125A supports high-efficiency, fast transient response
and provides a combined power-good signal. Out-of-Audio
™ mode light-load operation enables low acoustic
noise at much higher efficiency than conventional forced PWM operation. Adaptive on-time D-CAP ™ control
provides convenient and efficient operation. The part operates with supply input voltages ranging from 5.5 V to
28 V and supports output voltages from 2 V to 5.5 V.
The TPS51125AEVM evaluation module is a high-efficiency, dual synchronous buck converter providing 5 V at
8 A and 3.3 V at 8 A from 8-V to 25-V input.
2 Performance Specification Summary
Table 2-1 gives the EVM performance specifications and qualifications.
Table 2-1. Performance Specification Summary
SPECIFICATION TEST CONDITIONS MIN TYP MAX UNITS
V
IN
Input voltage range Voltage applied to VBAT 8 25 V
CHANNEL1
V
OUT
Output voltage 5 V
f Operating frequency V
TONSEL
= V
VREF
, V
VIN
= 12 V, I
OUT
= 6 A 245 kHz
I
OUT
Output current 8 V ≤ V
VIN
≤ 25 V 8
A
I
OC
Overcurrent limit V
VIN
= 12 V 10
CHANNEL2
V
OUT
Output voltage 3.3 V
f Operating frequency V
TONSEL
= V
VREF
, V
VIN
= 12 V, I
OUT
= 6 A 305 kHz
I
OUT
Output current 8 V ≤ V
VIN
≤ 25 V 8
A
I
OC
Overcurrent limit V
VIN
= 12 V 10
Introduction www.ti.com
2 TPS51125A Buck Controller Evaluation Module User's Guide SLUU408A – FEBRUARY 2010 – REVISED JANUARY 2022
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