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  Richtek Technology Electronic Components Datasheet  

RT8204B Datasheet

Single Synchronous Buck

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RT8204B
Single Synchronous Buck with LDO Controller
General Description
The RT8204B 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-onresponse to load transients while maintaining
a relatively constant switching frequency.
The RT8204B 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 RT8204B is intended for CPU core,
chipset, DRAM, or other low voltage supplies as low as
0.75V.
A built-in LDO controller can drive an external N-MOSFET
to provide a second output voltage from PWM output or
other power source. The RT8204B can provide adjustable
voltage down to 0.75V and maximum output voltage is
depended on the selected MOSFET. The internal 0.75V
reference voltage with ±1.5% accuracy provides tight
regulation for the output voltage. The independent enable
control, open drain power good indicator, under voltage
protection and soft start make RT8204B to power the
system friendly. The RT8204B is available in WQFN-16L
3x3 package.
Applications
z Notebook Computers
z CPU Core Supply
z Chipset/RAM Supply as Low as 0.75V
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
Features
z PWM Controller
` Ultra-High Efficiency
` Resistor Programmable Current Limit by Low Side
RDS(ON) Sense (Lossless Limit) or Sense Resistor
(High Accuracy)
` Quick Load Step Response within 100ns
` 1% VOUT Accuracy Over Line and Load
` Adjustable 0.75V to 3.3V Output Range
` 3V to 26V Battery Input Range
` Resistor Programmable Frequency
` Over/Under Voltage Protection
` 2 Steps Current Limit During Soft-Start
` Drives Large Synchronous-Rectifier FETs
` Power-Good Indicator
z LDO Controller
` 1.5% Accuracy Over Line and Load
` Adjustabe Output Voltage down to 0.75V
` Independent Enable and Power Good Indicator
` Drive N-MOSFETs within Rail to Rail Controller
Voltage
` MLCC and POSCAP Stable
z RoHS Compliant and Halogen Free
Ordering Information
RT8204B
Package Type
QW : WQFN-16L 3x3 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
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.
DS8204B-04 April 2011
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT8204B Datasheet

Single Synchronous Buck

No Preview Available !

RT8204B
Pin Configurations
(TOP VIEW)
16 15 14 13
VOUT
VDD
FB
PGOOD
1
2
3
4
GND
17
12 UGATE
11 PHASE
10 OC
9 VDDP
5678
WQFN-16L 3x3
Typical Application Circuit
VDDP
5V
C1
4.7µF
D1
BAT254
R4
1M
VIN
3V to 26V
R2
100k
PGOOD
16
RT8204B
TON
BOOT
13
9 VDDP
R1
10 2 VDD
UGATE 12
PHASE 11
C2
1µF
LGATE 8
4 PGOOD
OC 10
R5
2.2
R6 0
R7 10k
C3
0.1µF
Q2
AO4704
CCM/DEM
LDO Enable
LDO PGOOD
15 EN/DEM
14 LEN
5 LPGOOD
R3
100k
FB 3
VOUT 1
VDDP
Exposed Pad(17) GND
LDRV 7
C7
33nF
LFB 6
R11
C8
C4
10µF
Q1
AO4704 L1
2.4µH
R8
C5
R9
12k
R10
20k
Q3
AO4404
R12
12k
C10
220µF
R13
30k
VOUT1
1.2V
C6
C13
0.1µF
C9
220µF
VOUT2
C11 1.05V
10µF
C12
www.richtek.com
2
DS8204B-04 April 2011


Part Number RT8204B
Description Single Synchronous Buck
Maker Richtek
PDF Download

RT8204B Datasheet PDF






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