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RT8204AGQW

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19
RT8204A
1
DS8204A-05 April 2011 www.richtek.com
Single Synchronous Buck with LDO Controller
Applications
z Notebook Computers
z CPU Core Supply
z Chipset/RAM Supply as Low as 0.75V
General Description
The RT8204A 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 RT8204A 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 RT8204A 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 RT8204A 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 RT8204A to power the
system friendly. The RT8204A is available in WQFN-16L
3x3 package.
Features
zz
zz
z
PWM Controller
``
``
` Ultra-High Efficiency
``
``
` Resistor Programmable Current Limit by Low Side
R
DS(ON)
Sense (Lossless Limit) or Sense Resistor
(High Accuracy)
``
``
` Quick Load Step Response within 100ns
``
``
` 1% V
OUT
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
zz
zz
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
zz
zz
z RoHS Compliant and 100% Lead (Pb)-Free
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
Ordering Information
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.
RT8204A
Package Type
QW : WQFN-16L 3x3 (W-Type)
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
RT8204A
2
DS8204A-05 April 2011www.richtek.com
Typical Application Circuit
Pin Configurations
(TOP VIEW)
WQFN-16L 3x3
12
11
10
9
13141516
1
2
3
4
8765
PGOOD
FB
VOUT
VDD
UGATE
PHASE
VDDP
OC
LPGOOD
LDRV
LFB
LGATE
TON
EN/DEM
BOOT
LEN
GND
17
1
5
1
2
1
1
8
3
V
D
D
P
E
N
/
D
E
M
U
G
A
T
E
F
B
R
T
8
2
0
4
A
L
G
A
T
E
9
1
3
B
O
O
T
P
H
A
S
E
V
O
U
T
1
L
1
V
I
N
V
D
D
2
P
G
O
O
D
4
P
G
O
O
D
G
N
D
E
x
p
o
s
e
d
P
a
d
(
1
7
)
T
O
N
1
6
V
D
D
P
5
V
C
1
4
.
7
µ
F
R
2
1
0
0
k
R
1
1
0
C
2
1
µ
F
C
C
M
/
D
E
M
D
1
B
A
T
2
5
4
3
V
t
o
2
6
V
R
4
1
M
R
5
2
.
2
R
6
0
R
7
1
0
k
C
3
0
.
1
µ
F
C
4
1
0
µ
F
Q
1
A
O
4
7
0
4
Q
2
A
O
4
7
0
4
2
.
4
µ
H
R
8
C
5
R
9
1
2
k
C
8
C
9
2
2
0
µ
F
C
1
2
V
O
U
T
1
1
.
2
V
1
0
O
C
R
1
2
1
2
k
R
1
3
3
0
k
C
1
1
1
0
µ
F
C
1
0
2
2
0
µ
F
V
O
U
T
2
1
.
0
5
V
LDRV
LFB
LEN
1
4
L
D
O
E
n
a
b
l
e
LPGOOD
L
D
O
P
G
O
O
D
V
D
D
P
R
1
0
2
0
k
R
1
1
C
7
3
3
n
F
Q
3
A
O
4
4
0
4
R
3
1
0
0
k
7
6
5
C
6
C
1
3
0
.
1
µ
F
RT8204A
3
DS8204A-05 April 2011 www.richtek.com
Functional Pin Description
Pin No. Pin Name Pin Function
1 VOUT
VOUT Sense Input. Connect to the output of PWM converter. VOUT is an
input of the PWM controller.
2 VDD
Analog Supply Voltage Input for the internal analog integrated circuit. Bypass
to GND with a 1μF ceramic capacitor.
3 FB
VOUT Feedback Input. Connect FB to a resistor voltage divider from VOUT to
GND to adjust the output from 0.75V to 3.3V.
4 PGOOD
Power Good Signal Open-Drain Output of PWM Converter. This pin will be
pulled high when the output voltage is within the target range.
5 LPGOOD
Power Good signal Open-Drain Output of LDO Regulator. This pin will be
pulled high when the output voltage is within the target range.
6 LFB
LDO Feedback Input. Connect LFB to a resistor voltage divider from VOUT to
GND to adjust the output greater than 0.75V.
7 LDRV Drive Signal for the LDO’s path MOSFET.
8 LGATE
Low side N-MOSFET Gate-Drive Output for PWM. This pin swings between
GND and VDDP.
9 VDDP
VDDP is the gate driver supply for the external MOSFETs. Bypass to GND
with a 1μF ceramic capacitor.
10 OC
PWM Current Limit Setting and sense. Connect a resistor between OC to
PHASE for current limit setting.
11 PHASE
Inductor Connection. This pin is not only the zero-current-sense input for the
PWM converter, but also the UGATE high side gate driver return.
12 UGATE
High Side N-MOSFET Floating Gate-Driver Output for the PWM converter.
This pin swings between PHASE and BOOT.
13 BOOT
Boost Capacitor Connection for PWM Converter. Connect an external
ceramic capacitor to PHASE and an external diode to VDDP.
14 LEN
LDO Enable Input with internal pull low resistor. LDO is enabled if LEN is
greater than the on level and disabled if LEN is less than the off level.
15 EN/DEM
PWM Enable and Operation Mode Selection Input. Connect to VDD for diode
emulation mode, connect to GND for shutdown mode and floating the pin for
CCM mode.
16 TON
VIN Sense Input. Connect to VIN through a resistor. TON is an input of the
PWM controller.
17 (Exposed Pad) GND
Analog Ground and Power Ground. The exposed pad must be soldered to a
large PCB and connected to GND for maximum power dissipation.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19

RT8204AGQW

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Description:
IC REG DL BCK/LINEAR SYNC 16WQFN
Lifecycle:
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