RT8202L/M
Single Synchronous Buck Controller
General Description
The RT8202L/M PWM controller provides the 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
supplies in notebook computers.
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
a relatively constant switching frequency.
The RT8202L/M 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 RT8202L is available in a
WQFN-16L 4x4 package and the RT8202M is available in
a WQFN-16L 3x3 package.
Ordering Information
RT8202L/M
Package Type
QW : WQFN-16L 4x4 (W-Type)
QW : WQFN-16L 3x3 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Z : ECO (Ecological Element with
Halogen Free and Pb free)
L : WQFN-16L 4x4
M : WQFN-16L 3x3
Note :
Richtek products are :
` RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
` Suitable for use in SnPb or Pb-free soldering processes.
Features
z Ultra-High Efficiency
z Resistor Programmable Current Limit by Low Side
RDS(ON) Sense (Lossless Limit)
z 4700ppm/°C RDS(ON) Current Sensing
z Quick Load Step Response within 100ns
z 1% VFB Accuracy over Line and Load
z Adjustable 0.75V to 3.3V Output Voltage Range
z 3V to 26V Battery Input Voltage Range
z Resistor Programmable Frequency
z Integrated Bootstrap Switch
z Over Voltage Protection
z Under Voltage Protection
z Voltage Ramp Soft-Start
z Built In Soft Discharge Output
z Power Good Indicator
z RoHS Compliant and 100% Halogen Free
Applications
z Notebook Computers
z CPU Core Supply
z Chipset/RAM Supply as Low as 0.75V
Pin Configurations
(TOP VIEW)
16 15 14 13
VOUT 1
12 UGATE
VDD 2
FB 3
PGOOD 4
GND
17
11 PHASE
10 OC
9 VDDP
56 78
WQFN-16L 4x4 (RT8202L)/
WQFN-16L 3x3 (RT8202M)
DS8202L/M-04 April 2011
www.richtek.com
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Free Datasheet http://www.Datasheet4U.com
