Service Manuals, User Guides, Schematic Diagrams or docs for : . Electronic Components Datasheets Various RT8202-DS8202AB-05
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RT8202/A/B
Single Synchronous Buck Controller
General Description Features
The RT8202/A/B PWM controller provides high efficiency, Ultra-High Efficiency
excellent transient response, and high DC output accuracy Resistor Programmable Current Limit by Low Side
needed for stepping down high voltage batteries to RDS(ON) Sense (Lossless Limit) or Sense Resistor
generate low voltage CPU core, I/O, and chipset RAM (High Accuracy)
supplies in notebook computers. Quick Load Step Response within 100ns
1% VOUT Accuracy over Line and Load
The constant on-time PWM control scheme handles wide
Adjustable 0.75V to 3.3V Output Range
input/output voltage ratios with ease and provides 100ns
4.5V to 26V Battery Input Range
"instant-on" response to load transients while maintaining
Resistor Programmable Frequency
a relatively constant switching frequency.
Over/Under Voltage Protection
The RT8202/A/B achieves high efficiency at a reduced 2 Steps Current Limit During Soft-Start
cost by eliminating the current sense resistor found in Drives Large Synchronous-Rectifier FETs
traditional current mode PWMs. Efficiency is further Power Good Indicator
enhanced by its ability to drive very large synchronous RoHS Compliant and 100% Lead (Pb)-Free
rectifier MOSFETs. The buck conversion allows this device
to directly step down high voltage batteries for the highest Applications
possible efficiency. The RT8202/A/B is intended for CPU
Notebook Computers
core, chipset, DRAM, or other low voltage supplies as
CPU Core Supply
low as 0.75V. RT8202 is available in WQFN-16L 4x4,
Chipset/RAM Supply as Low as 0.75V
RT8202A is available in WQFN-16L 3x3 and RT8202B is
available in WQFN-14L 3.5x3.5 packages.
Pin Configurations
(TOP VIEW)
Ordering Information
EN/DEM
BOOT
RT8202/A/B
TON
NC
Package Type 16 15 14 13
QW : WQFN-16L 4x4 (W-Type) (RT8202) VOUT 1 12 UGATE
QW : WQFN-16L 3x3 (W-Type) (RT8202A) VDD 2
GND
11 PHASE
FB 3 10 OC
QW : WQFN-14L 3.5x3.5 (W-Type) (RT8202B) 17
PGOOD 4 9 VDDP
Lead Plating System 5 6 7 8
P : Pb Free
NC
GND
PGND
LGATE
G : Green (Halogen Free and Pb Free)
Note : WQFN-16L 4x4/WQFN-16L 3x3
Richtek products are :
RoHS compliant and compatible with the current require-
EN/DEM
BOOT
ments of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes. 1 14
TON 2 13 UGATE
VOUT 3 12 PHASE
Marking Information VDD 4 GND
15
11 OC
FB 5 10 VDDP
For marking information, contact our sales representative PGOOD 6 9 LGATE
7 8
directly or through a Richtek distributor located in your
PGND
GND
area.
WQFN-14L 3.5x3.5
DS8202/A/B-05 April 2011 www.richtek.com
1
RT8202/A/B
Typical Application Circuit
VIN
D1 4.5V to 26V
BAT254
VDDP
5V
C1 R3
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