1 Features and Electrical Performance
The LM5157EVM-BST supports the following features and performance capabilities:
• Tightly regulated output voltage of 12 V with 1% accurate reference voltage
• High conversion efficiency of > 92% at full load
• Constant cycle-by-cycle peak inductor current limit over input voltage range
• Programmable hiccup mode for output overcurrent protection
• User-adjustable soft-start time using C
SS
• Output overvoltage protection
• Multiple BIAS pin and VCC pin connections to test multiple configurations
– BIAS connect to VCC
– BIAS supplied with external power supply
– BIAS supplied by output voltage
• Power-good (PGOOD) indicator with selectable pullup source
• 2.1-MHz switching frequency
• External clock synchronization
• Programmable dual random spread spectrum reduces the EMI
1.1 Electrical Parameters
Table 1-1. Electrical Performance Standard Configuration
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
INPUT CHARACTERISTICS
Input voltage range V
IN
Operation
3
6
9
V
OUTPUT CHARACTERISTICS
Output Voltage V
OUT
12
V
Maximum output current I
OUT
VIN = 6 V~9 V
1.6
A
VIN = 4 V~6 V
0.8
Output Over-voltage V
OUT_OV
13.6
V
SYSTEM CHARACTERISTICS
Switching frequency
2.1
MHz
External clock synchronization
1.8
2.4
kHz
Full load efficiency
V
IN
= 6 V, I
OUT
= 1.6 A
92.2
%
Junction temperature, T
J
-40
150
C
Features and Electrical Performance
SNVU739A – OCTOBER 2020 – REVISED AUGUST 2021
LM5157EVM-BST Evaluation Module
3
Copyright © 2021 Texas Instruments Incorporated
