1 Description
The TPS51220 is a dual, peak-current mode, synchronous step-down controller with three low-dropout (LDO)
regulators. It is optimized for 5-V /3.3-V notebook system power supplies. A 99% duty cycle operation enables
designers to complete Li-ion battery applications from 2-cells to 4-cells cost effectively. The TPS51220 supports
high-efficiency, fast transient response and 99% duty cycle operation. DCR current sensing provides lossless
current sensing and free MOSFET selection; resistor sensing supports accurate current-sensing operation. It
supports supply input voltages ranging from 4.5 V to 30 V and output voltages from 1 V to 12 V. High-current, 5
V at 100 mA, 3.3 V at 10 mA, onboard linear regulators have glitch-free switchover function to SMPS, and the
2-V reference has a 100-μA capability.
A peak current-sensing current mode and fixed-frequency control scheme support the full range of current mode
operation including simplified loop compensation, ceramic output capacitors, as well as a seamless transition to
reduced frequency operation at light-load condition.
This evaluation module demonstrates the performance of the high-current/ high-efficiency TPS51220 buck
converter
2 Electrical Performance
SPECIFICATIONS
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Input voltage range (VIN)
8
12
20
V
CH1
Output voltage
5
V
Operating frequency
VIN = 12 V, Iout1 = 6 A
280
kHz
Output current
VIN = 8 V to 20 V
6
A
Over current limit
VIN = 12 V
9
A
Output ripple voltage
VIN = 12 V, Iout1 = 6 A
15
mVp-p
CH2
Output voltage
3.3
V
Operating frequency
VIN = 12 V, Iout2 = 6 A
280
kHz
Output current
VIN = 8 V to 20 V
6
A
Over current limit
VIN = 12 V
9
A
Output ripple voltage
VIN = 12 V, Iout2 = 6 A
15
mVp-p
Description
2
TPS51220 Buck Controller Evaluation Module User's Guide
SLVU251B – JUNE 2008 – REVISED FEBRUARY 2022
Copyright © 2022 Texas Instruments Incorporated
