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  Richtek Technology Electronic Components Datasheet  

RT8057A Datasheet

2.25MHz 1A Synchronous Step-Down Converter

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®
RT8057A
2.25MHz 1A Synchronous Step-Down Converter
General Description
The RT8057A is a high efficiency Pulse-Width-Modulated
(PWM) step-down DC/DC converter, capable of delivering
1A output current over a wide input voltage range from 2.7V
to 5.5V. The RT8057A is ideally suited for portable
electronic devices that are powered from 1-cell Li-ion
battery or from other power sources such as cellular
phones, PDAs, hand-held devices, game console and
related accessories.
The internal synchronous rectifier with low RDS(ON)
dramatically reduces conduction loss at PWM mode.
No external Schottky diode is required in practical
applications. The RT8057A enters Low Dropout Mode when
normal Pulse -Width Mode cannot provide regulated output
voltage by continuously turning on the upper P-MOSFET.
The RT8057A enters shut-down mode and consumes less
than 1μA when the EN pin is pulled low. The switching
ripple is easily smoothed-out by small package filtering
elements due to a fixed operating frequency of 2.25MHz.
The RT8057A is available in a small WDFN-6SL 2x2
package.
Ordering Information
RT8057A (2)
Pin 1 Orientation
(2) : Quadrant 2, Follow EIA-481-D
(For WDFN-6SL 2x2 Only)
Package Type
QW : WDFN-6SL 2x2 (W-Type)
J5 : TSOT-23-5
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.
Features
2.7V to 5.5V Wide Input Operation Range
2.25MHz Fixed-Frequency PWM Operation
Up to 1A Output Current
Up to 90% Efficiency
0.6V Reference Allows Low Output Voltage
Internal Soft-Start
No Schottky Diode Required
Internal Compensation to Reduce External
Components
Low Dropout Operation : 100% Duty Cycle
RoHS Compliant and Halogen Free
Applications
Portable Instruments
Game Console and Accessories
Microprocessors and DSP Core Supplies
Cellular Phones
Wireless and DSL Modems
PC Cards
Pin Configurations
(TOP VIEW)
LX 1
NC 2
FB 3
6 GND
5 VIN
7 4 EN
WDFN-6SL 2x2
LX
FB
5
4
2
3
VIN GND EN
TSOT-23-5
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS8057A-01 March 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT8057A Datasheet

2.25MHz 1A Synchronous Step-Down Converter

No Preview Available !

RT8057A
Marking Information
RT8057AGJ5
04=DNN
04= : Product Code
DNN : Date Code
RT8057AGQW
0CW
0C : Product Code
W : Date Code
Typical Application Circuit
RT8057A
VIN
VIN
LX
CIN
4.7µF
EN
FB
GND
L1
2.2µH
C1 R1
10pF 680k
R2
240k
VOUT
2.3V
COUT
10µF
Function Pin Description
Pin No.
Pin Name
WDFN-6SL 2x2 TSOT-23-5
Pin Function
1
5
LX
Switch Node. Connect to the external inductor.
2
--
NC
No Internal Connection. Connect to GND.
3
4
FB
Feedback Pin. Connect to the external resistor divider. The FB
reference voltage is 0.6V typically.
4
3
EN
Chip Enable (Active High).
5
1
VIN
Power Input. Connect to the input capacitor.
6,
7 (Exposed Pad)
2
GND
Power GND. The Exposed Pad must be soldered to a large PCB and
connected to GND for maximum power dissipation.
Function Block Diagram
EN
VIN
Slope
Compensation
OSC &
Shutdown
Control
Current
Sense
Current
Limit
Detector
Error
Amplifier
FB
Control
Logic
Driver
PWM
RC
Comparator
COMP
UVLO &
Power Good
Detector
VREF
RS1
LX
RS2
GND
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS8057A-01 March 2014


Part Number RT8057A
Description 2.25MHz 1A Synchronous Step-Down Converter
Maker Richtek
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RT8057A Datasheet PDF






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