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RT8011GQW

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17
RT8011/A
1
DS8011/A-02 March 2011 www.richtek.com
Features
zz
zz
z
High Efficiency : Up to 95%
zz
zz
z Low R
DS(ON)
Internal Switches : 110m
ΩΩ
ΩΩ
Ω
zz
zz
z Programmable Frequency : 300kHz to 4MHz
zz
zz
z No Schottky Diode Required
zz
zz
z 0.8V Reference Allows Low Output Voltage
zz
zz
z Forced Continuous Mode Operation
zz
zz
z Low Dropout Operation : 100% Duty Cycle
zz
zz
z Synchronizable Switching Frequency (For RT8011
Only)
zz
zz
z Power Good Output Voltage Monitor (For RT8011
Only)
zz
zz
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z Portable Instruments
z Battery-Powered Equipment
z Notebook Computers
z Distributed Power Systems
z IP Phones
z Digital Cameras
General Description
The RT8011/A is a high efficiency synchronous, step-down
DC/DC converter. Its input voltage range is from
2.6V to
5.5V and provides an adjustable regulated output voltage
from 0.8V to 5V while delivering up to 2A of output current.
The internal synchronous low on-resistance power
switches increase efficiency and eliminate the need for
an external Schottky diode. Switching frequency is set
by an external resistor or can be synchronized to an
external clock. 100% duty cycle provides low dropout
operation extending battery life in portable systems.
Current mode operation with external compensation
allows the transient response to be optimized over a wide
range of loads and output capacitors.
RT8011/A operation in forced continuous PWM Mode which
minimizes ripple voltage and reduces the noise and RF
interference.
100% duty cycle in Low Dropout Operation further
maximize battery life.
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.
Ordering Information
Pin Configurations
(TOP VIEW)
MSOP-10
2A, 4MHz, Synchronous Step-Down Regulator
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
WDFN-10L 3x3
SHDN/RT
PGND
GND
COMP
FB
VDD
PVDD
LX
7
6
5
1
2
3
4
8
WDFN-8EL 3x3
COMP
VDD
SHDN/RT
LX
GND
FB
PGOOD
PGND
PVDD
SYNC
5
6
7
8
4
3
2
10
9
SHDN/RT
SYNC
PGND
LX
COMP
FB
PGOOD
PVDD
VDD
GND
9
8
7
9
1
2
3
4
5
10
RT8011/A
Package Type
F : MSOP-10 (RT8011)
QW : WDFN-10L 3x3 (RT8011)
QW : WDFN-8EL 3x3 (RT8011A)
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
Without SYNC and PGOOD Function
With SYNC and PGOOD Function
RT8011/A
2
DS8011/A-02 March 2011www.richtek.com
Typical Application Circuit
Figure 1. Typical Application Circuit for RT8011
Figure 2. Typical Application Circuit for RT8011A
Note : Using all Ceramic Capacitors
COMP
FB
PGOOD
SHDN/RT
SYNC
LX
RT8011
1
2
4
7
8
9
VDD
PVDD
GND
6
5
PGND
3
10
V
IN
2.6V to 5.5V
V
OUT
2.5V/2A
R
OSC
332k
L1
2.2uH
R
COMP
13k
R
PGOOD
100k
C
IN
22uF
R2
240k
C
COMP
1000pF
C1
22pF
R1
510k
C
OUT
22uF
COMP
FB
SHDN/RT
LX
RT8011A
1
3
6
7
VDD
PVDD
GND
5
4
PGND
2
8
V
IN
2.6V to 5.5V
V
OUT
2.5V/2A
R
OSC
332k
L1
2.2uH
R
COMP
13k
C
IN
22uF
R2
240k
C
COMP
1000pF
R1
510k
C
OUT
22uF
Component Supplier Series Inductance (μH) DCR (mΩ) Current Rating (mA) Dimensions (mm)
TAIYO YUDEN NR 4018 2.2 60 2700 4x4x1.8
Sumida CDRH4D28 2.2 31.3 2040 4.5x4.5x3
GOTREND GTSD53 2.2 29 2410 5x5x2.8
ABC SR0403 2.2 47 2600 4.5x4x3.2
Table 1
Component Supplier Part No. Capacitance (μF) Case Size
TDK C3225X5R0J226M 22 1210
TDK C3225X5R0J226M 22 1210
TDK C2012X5R0J106M 10 0805
Panasonic ECJ4YB0J226M 22 1210
Panasonic ECJ4YB1A226M 22 1210
Panasonic ECJ4YB1A106M 10 1210
TAIYO YUDEN LMK325BJ226ML 22 1210
TAIYO YUDEN JMK316BJ226ML 22 1206
TAIYO YUDEN JMK212BJ106ML 10 0805
Table 2
RT8011/A
3
DS8011/A-02 March 2011 www.richtek.com
Functional Pin Description
Pin Number Pin Function
RT8011 RT8011A
Pin Name
1 1 SHDN/RT
Oscillator Resistor Input. Connecting a resistor to ground from this pin sets
the switching frequency. Forcing this pin to V
DD
causes the device to be shut
down.
2 -- SYNC
External Clock Synchronization Input. The oscillation frequency can be
synchronized to an external oscillation applied to this pin. When tied to V
DD
,
internal oscillator is selected.
3 2 GND
Signal Ground. All small-signal components and compensation components
should connect to this ground, which in turn connects to PGND at one point.
4 3 LX Internal Power MOSFET Switches Output. Connect this pin to the inductor.
5 4 PGND Power Ground. Connect this pin close to the (−) terminal of C
IN
and C
OUT
.
6 5 PVDD Power Input Supply. Decouple this pin to PGND with a capacitor.
7 6 VDD
Signal Input Supply. Decouple this pin to GND with a capacitor. Normally V
DD
is equal to PVDD.
8 -- PGOOD
Power Good Indicator. Open-drain logic output that is pulled to ground when
the output voltage is not within ±12.5% of regulation point.
9 7 FB
Feedback Pin. Receives the feedback voltage from a resistive divider
connected across the output.
10 8 COMP
Error Amplifier Compensation Point. The current comparator threshold
increases with this control voltage. Connect external compensation elements
to this pin to stabilize the control loop.
Figure 4. RT8011A Layout Guide
Figure 3. RT8011 Layout Guide
Layout Guide
V
IN
GND
L1
V
OUT
GND
C
IN
C
OUT
V
OUT
V
IN
R
COMP
C
COMP
R2
R1
C
F
R
OSC
C
IN
must be placed between
V
DD
and GND as closer as
possible
LX should be
connected to
Inductor by wide
and short trace,
keep sensitive
compontents away
from this trace
Output capacitor must
be near RT8011
Connect the FB pin directly to feedback resistors. The
resistor divider must be connected between V
OUT
and
GND.
COMP
VDD
SHDN/RT
LX
GND
FB
PGOOD
PGND
PVDD
SYNC
5
6
7
8
4
3
2
10
9
1
RT8011
V
IN
GND
L1
V
OUT
GND
C
IN
C
OUT
V
OUT
R
COMP
C
COMP
R2
R1
C
F
R
OSC
C
IN
must be placed between
V
DD
and GND as closer as
possible
LX should be
connected to
Inductor by wide
and short trace,
keep sensitive
compontents away
from this trace
Output capacitor must
be near RT8011A
Connect the FB pin directly to feedback resistors. The
resistor divider must be connected between V
OUT
and
GND.
COMP
VDD
SHDN/RT
LX
GNDFB
PGND
PVDD
4
5
63
2
8
7
1
RT8011A
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17

RT8011GQW

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IC REG BUCK ADJUSTABLE 2A 10WDFN
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