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  Richtek Technology Electronic Components Datasheet  

RT8204L Datasheet

Single Synchronous Buck Controller

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RT8204L
Single Synchronous Buck Controller
General Description
The RT8204L 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
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 RT8204L 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 RT8204L is intended for CPU core,
chipset, DRAM, or other low voltage supplies as low as
0.75V. The RT8204L is available in a WQFN-16L 3x3
package.
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 RT8204L can provide adjustable
voltage down to 0.75V and maximum output voltage is
dependen on the selected MOSFET. The internal 0.75V
reference voltage with ±1.5% accuracy provides tight
regulation of the output voltage. Other features such as
independent enable control, open drain power good
indicator, under voltage protection, and soft start make
the RT8204L a system friendly power management solution
for various applications.
Features
z PWM Controller
` Ultra High Efficiency
` Resistor Programmable Current Limit by Low Side
RDS(ON) Sense (Lossless Limit)
` 4700ppm/°C RDS(ON) Current Sensing
` Quick Load Step Response within 100ns
` 1% VFB Accuracy Over Line and Load
` Adjustable 0.75V to 3.3V Output Range
` 4.5V to 26V Battery Input Range
` Resistor Programmable Frequency
` Integrated Bootstrap Switch
` Over/Under Voltage Protection
` Voltage Ramp Soft-Start
` Power Good Indicator
z LDO Controller
` 1.5% accuracy Over Line and Load
` 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
Applications
z Notebook Computers
z CPU Core Supply
z Chipset/RAM Supply as Low as 0.75V
Ordering Information
RT8204L
Package 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)
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.
DS8204L-04 April 2011
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT8204L Datasheet

Single Synchronous Buck Controller

No Preview Available !

RT8204L
Marking Information
RT8204LGQW
J8= : Product Code
J8=YM
DNN
YMDNN : Data Code
RT8204LZQW
J8 YM
DNN
J8 : Product Code
YMDNN : Data Code
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
5 678
WQFN-16L 3x3
Typical Application Circuit
RTON
VDDP
5V
C1
PGOOD
CCM/DEM
LDO Enable
LDO PGOOD
VDDP
16 TON
RT8204L
BOOT
13
R4
9 VDDP
R2
R1 2 VDD
C2
UGATE 12
PHASE 11
LGATE 8
OC 10
R5
RILIM
4 PGOOD
15 EN/DEM
FB 3
14 LEN
5 LPGOOD
VOUT 1
R3
LDRV 7
17 (Exposed Pad) GND
* : Optional
LFB 6
R9
C9
VIN
4.5V to 26V
C3
Q2
C4
Q1
L1
R6*
C5*
R7 C6*
VOUT1
C8
R8 C7*
R10
C10
Q3
R11
R12
C11*
C12
VOUT2
C13
C14
www.richtek.com
2
DS8204L-04 April 2011


Part Number RT8204L
Description Single Synchronous Buck Controller
Maker Richtek
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RT8204L Datasheet PDF





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