RT8202/A/B
General Description
The RT8202/A/B PWM controller provides high efficiency,
excellent transient response, and high DC output accuracy
needed for stepping down high voltage batteries to
generate low voltage CPU core, I/O, and chipset RAM
The constant on-time PWM control scheme handles wide
input/output voltage ratios with ease and provides 100ns
“instant-on” response to load transients while maintaining
The RT8202/A/B achieves high efficiency at a reduced
cost by eliminating the current sense resistor found in
traditional current mode PWMs. Efficiency is further
enhanced by its ability to drive very large synchronous
rectifier MOSFETs. The buck conversion allows this device
to directly step down high voltage batteries for the highest
possible efficiency. The RT8202/A/B is intended for CPU
core, chipset, DRAM, or other low voltage supplies as
low as 0.75V. RT8202 is available in WQFN-16L 4x4,
RT8202A is available in WQFN-16L 3x3 and RT8202B is
Ultra-High Efficiency
RDS(ON) Sense (Lossless Limit) or Sense Resistor
Quick Load Step Response within 100ns
Adjustable 0.75V to 3.3V Output Range
Resistor Programmable Frequency
2 Steps Current Limit During Soft-Start
Power Good Indicator
Applications
CPU Core Supply
Pin Configurations
RT8202/A/B
Package Type
QW : WQFN-16L 3x3 (W-Type) (RT8202A)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Richtek products are :
RoHS compliant and compatible with the current require-
Suitable for use in SnPb or Pb-free soldering processes.
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
16 15 14 13
VDD
PGOOD
2
4
17
11 PHASE
9 VDDP
WQFN-16L 4x4/WQFN-16L 3x3
VOUT
FB
2
4
6
GND
78
12 PHASE
10 VDDP
WQFN-14L 3.5x3.5
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
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