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Step-Down Converter. RT8057A Datasheet

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Step-Down Converter. RT8057A Datasheet
















RT8057A Converter. Datasheet pdf. Equivalent













Part

RT8057A

Description

2.25MHz 1A Synchronous Step-Down Converter



Feature


® RT8057A 2.25MHz 1A Synchronous Step- Down Converter General Description The RT8057A is a high efficiency Pulse-Wid th-Modulated (PWM) step-down DC/DC conv erter, capable of delivering 1A output current over a wide input voltage range from 2.7V to 5.5V. The RT8057A is idea lly suited for portable electronic devi ces that are powered from 1-cell Li-ion battery or from ot.
Manufacture

Richtek

Datasheet
Download RT8057A Datasheet


Richtek RT8057A

RT8057A; her power sources such as cellular phone s, PDAs, hand-held devices, game consol e and related accessories. The internal synchronous rectifier with low RDS(ON) dramatically reduces conduction loss a t PWM mode. No external Schottky diode is required in practical applications. The RT8057A enters Low Dropout Mode whe n normal Pulse -Width Mode cannot provi de regulated outpu.


Richtek RT8057A

t voltage by continuously turning on the upper P-MOSFET. The RT8057A enters shu t-down mode and consumes less than 1μA when the EN pin is pulled low. The swi tching ripple is easily smoothed-out by small package filtering elements due t o a fixed operating frequency of 2.25MH z. The RT8057A is available in a small WDFN-6SL 2x2 package. Ordering Informat ion RT8057A (2) Pin.


Richtek RT8057A

1 Orientation (2) : Quadrant 2, Follow EIA-481-D (For WDFN-6SL 2x2 Only) Packa ge Type QW : WDFN-6SL 2x2 (W-Type) J5 : TSOT-23-5 Lead Plating System G : Gree n (Halogen Free and Pb Free) Note : Ric htek products are :  RoHS compliant and compatible with the current require ments of IPC/JEDEC J-STD-020.  Suita ble for use in SnPb or Pb-free solderin g processes. Features.





Part

RT8057A

Description

2.25MHz 1A Synchronous Step-Down Converter



Feature


® RT8057A 2.25MHz 1A Synchronous Step- Down Converter General Description The RT8057A is a high efficiency Pulse-Wid th-Modulated (PWM) step-down DC/DC conv erter, capable of delivering 1A output current over a wide input voltage range from 2.7V to 5.5V. The RT8057A is idea lly suited for portable electronic devi ces that are powered from 1-cell Li-ion battery or from ot.
Manufacture

Richtek

Datasheet
Download RT8057A Datasheet




 RT8057A
®
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




 RT8057A
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




 RT8057A
RT8057A
Absolute Maximum Ratings (Note 1)
Supply Input Voltage, VIN ------------------------------------------------------------------------------------------------ 6.5V
Power Dissipation, PD @ TA = 25°C
WDFN-6SL 2x2 ------------------------------------------------------------------------------------------------------------ 0.833W
TSOT-23-5 ------------------------------------------------------------------------------------------------------------------- 0.625W
Package Thermal Resistance (Note 2)
WDFN-6SL 2x2, θJA ------------------------------------------------------------------------------------------------------- 120°C/W
WDFN-6SL 2x2, θJC ------------------------------------------------------------------------------------------------------ 8.2°C/W
TSOT-23-5, θJA ------------------------------------------------------------------------------------------------------------- 160°C/W
Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------- 260°C
Junction Temperature ----------------------------------------------------------------------------------------------------- 150°C
Storage Temperature Range -------------------------------------------------------------------------------------------- 65°C to 150°C
ESD Susceptibility (Note 3)
HBM -------------------------------------------------------------------------------------------------------------------------- 2kV
MM ---------------------------------------------------------------------------------------------------------------------------- 200V
Recommended Operating Conditions (Note 4)
Supply Input Voltage, VIN ------------------------------------------------------------------------------------------------ 2.7V to 5.5V
Junction Temperature Range -------------------------------------------------------------------------------------------- 40°C to 125°C
Ambient Temperature Range -------------------------------------------------------------------------------------------- 40°C to 85°C
Electrical Characteristics
(VIN = 3.6V, TA = 25°C unless otherwise specified)
Parameter
Symbol
Test Conditions
Output Current
Quiescent Current
IOUT
IQ
VIN = 2.7V to 5.5V
IOUT = 0mA
Reference Voltage (0.6V)
VREF
Note 5
Under Voltage Lockout Threshold VUVLO
VIN Rising
Hysteresis
Shutdown Current
ISHDN
Switching Frequency
EN Threshold Logic-High
VIH
Voltage
Logic-Low
VIL
Thermal Shutdown Temperature TSD
Switch On
Resistance
High Side
Low Side
Peak Current Limit
RDS(ON)_H ISW = 0.2A
RDS(ON)_L ISW = 0.2A
ILIM
Output Voltage Line Regulation
VIN = 2.7V to 5.5V
Output Voltage Load Regulation
Start-Up Time
tss
0mA < IOUT < 0.6A
Guaranteed by Design
Min Typ Max Unit
--
--
1
A
--
81 -- A
2
--
2
%
2.5 -- 2.5
2
2.2 2.4
V
--
0.2 --
--
0.1 1 A
-- 2.25 -- MHz
1
--
VIN
V
--
-- 0.4
--
150 -- °C
--
250 --
m
--
200 --
1.1 1.5 2
A
--
--
1 %/V
--
--
1
%
200 300 400 s
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS8057A-01 March 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
3




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