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PT1203 Datasheet Preview

PT1203 Datasheet

Synchronous Step-Down Converter

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PT1203
2A, 18V, 350KHz
Synchronous Step-Down Converter
GENERAL DESCRIPTION
FEATURES
The PT1203 is a monolithic pulse-width-modulated
(PWM) synchronous step-down switch mode regulator
with two internal power MOSFETs. It achieves 2A
continuous output current over a wide input supply
range with excellent load and line regulation. Current
mode operation provides fast transient response and
eases loop stabilization. Fault condition protection
includes cycle-by-cycle current limit and thermal
shutdown.
The PT1203 requires a minimum number of external
components, available in SOP-8 and ESOP-8 package.
z 2A Output Current
z 0.13Internal Power MOSFET Switch
z Stable with Low ESR Output Ceramic Capacitors
z Up to 93% Efficiency
z Fixed 350KHz Frequency
z Thermal Shutdown
z Cycle-by-Cycle Over Current Protection
z Wide 4.75V to 18V Operating Input Range
z Output Adjustable from 0.923V to 15V
z Available in 8-Pin SOP8 and ESOP8 Packages
APPLICATION
z PC Monitors
z LCD TV
z Distributed Power Systems
z Network Systems
z FPGA, DSP, ASIC Power Supplies
z Notebook Computers
ORDERING INFORMATION
PACKAGE
SOP-8
TEMPERATURE
RANGE
-40to 85
ORDERING PART
NUMBER
PT1203ESOH
ESOP-8
-40to 85
PT1203EESH
Note:
xxxxxX
Assembly Factory Code
Lot Number
TRANSPORT
MEDIA
Tape and Reel
2500 units
Tape and Reel
2500 units
MARKING
PT1203
xxxxxX
PT1203
xxxxxX
TYPICAL APPLICATION CIRCUIT
Figure1 ——PT1203 Typical application circuit
China Resources Powtech (Shanghai) Limited
PT1203_DS Rev EN1.0
WWW.CRPOWTECH.COM
Page1




Powtech

PT1203 Datasheet Preview

PT1203 Datasheet

Synchronous Step-Down Converter

No Preview Available !

PT1203
2A, 18V, 350KHz
Synchronous Step-Down Converter
PIN ASSIGNMENT
BS
IN
SW
GND
TOP VIEW
SS
EN
COMP
FB
SOP8
BS
IN
SW
GND
TOP VIEW
SS
EN
COMP
FB
EXPOSED PAD
ON BACKSIDE
CONNECT
TO GND PIN
ESOP8
PIN DESCRIPTIONS
SOP8
PIN No.
1
2
3
4
5
6
7
8
PIN
NAMES
BS
IN
SW
GND
FB
COMP
EN
SS
DESCRIPTION
High-Side Gate Driver Boost Input. BS supplies the drive for the high-side N-channel
MOSFET switch. Connect a 0.01uF or greater capacitor from SW to BS to power the high
side switch.
Supply Voltage. The PT1203 operates from a +4.75V to +18V unregulated input. C1 is
needed to prevent large voltage spikes from appearing at the input.
Power Switching Output. This PIN is connected to IN through M1 or to GND through M2.
Ground
Feedback Input. FB senses the output voltage through an external resistive divider which is
connected from the output to GND.
Compensation Node. COMP compensates the control loop by connecting a serial RC
network to ground. In some cases, an additional capacitor from COMP to GND is required.
Enable Input. EN is digital input that turns the regulator on or off. Drive EN high to turn on
the regulator, drive it low to turn it off. Pull up to IN with 100kresistor for automatic
startup.
Soft-Start. Connect a capacitor from SS to GND to program the soft-start period. Leave it
open if unused.
China Resources Powtech (Shanghai) Limited
PT1203_DS Rev EN1.0
WWW.CRPOWTECH.COM
Page2


Part Number PT1203
Description Synchronous Step-Down Converter
Maker Powtech
Total Page 13 Pages
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