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Exar Corporation

XRP7657 Datasheet Preview

XRP7657 Datasheet

25V Non Synchronous PWM Step Down Regulator

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September 2009
XRP7657
2A, 25V Non Synchronous PWM Step Down Regulator
Rev. 1.0.0
GENERAL DESCRIPTION
The XRP7657 is a non synchronous voltage
mode PWM step down (buck) regulator
capable of a constant output current up to
2Amps. A wide 4.75V to 25V input voltage
range allows for single supply operations from
industry standard 5V, 12V and 24V power
rails.
With a 420kHz constant operating frequency
and integrated high side switch, the XRP7657
reduces the overall component count and
solution footprint. In addition to a 2% output
setpoint accuracy, this device provides high
efficiency, low ripple and excellent line and
load regulation. An enable function and soft
start feature allow for controlled power up
sequencing implementation.
Built-in over current, output short-circuit and
over temperature protection insure safe
operations under abnormal operating
conditions.
The XRP7657 is offered in a RoHS compliant,
“green”/halogen free 8-pin SOIC package.
APPLICATIONS
Distributed Power Architectures
Point of Load Converters
Audio-Video Equipments
Medical & Industrial Equipments
FEATURES
2A Constant Output Current
4.75V to 25V Wide Input Voltage
PWM Voltage Mode Control
420kHz Constant Operations
Up to 94% Efficiency
Adjustable Output Voltage
0.8V to 21V Range
2% Accuracy
Soft-Start and Enable Function
Built-in Thermal, Over Current and
Output Short Circuit Protection
RoHS Compliant, “Green”/Halogen
Free 8-Pin SOIC Package
TYPICAL APPLICATION DIAGRAM
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Fig. 1: XRP7657 Application Diagram
Exar Corporation
48720 Kato Road, Fremont CA 94538, USA
www.exar.com
Tel. +1 510 668-7000 – Fax. +1 510 668-7001




Exar Corporation

XRP7657 Datasheet Preview

XRP7657 Datasheet

25V Non Synchronous PWM Step Down Regulator

No Preview Available !

XRP7657
2A, 25V Non Synchronous PWM Step Down Regulator
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation of
the device at these ratings or any other above those
indicated in the operation sections of the specifications
below is not implied. Exposure to absolute maximum
rating conditions for extended periods of time may affect
reliability.
VIN ............................................................ -0.3V to 30V
COMP, FB pin voltage....................................-0.3V to 6V
SW, EN pin voltage ...................................... -0.3V to VIN
Storage Temperature .............................. -65°C to 150°C
Power Dissipation ................................ Internally Limited
Junction Temperature TJ ....................................... 150°C
Lead Temperature (Soldering, 10 sec) ................... 260°C
ESD Rating (HBM - Human Body Model) .................... 2kV
OPERATING RATINGS
Input Voltage Range VIN.............................. 4.75V to 25V
Output Voltage Range VOUT ............................0.8V to 21V
Junction Temperature TJ Range.................-40°C to 125°C
Thermal Resistance θJA
(junction to ambient, no heat sink, free air) ........100°C/W
ELECTRICAL SPECIFICATIONS
Specifications with standard type are for an Ambient Temperature of TA = 25°C only; limits applying over the full Operating
Junction Temperature range are denoted by a “•”. Minimum and Maximum limits are guaranteed through test, design, or
statistical correlation. Typical values represent the most likely parametric norm at TA = 25°C, and are provided for reference
purposes only. Unless otherwise indicated, VIN = 12V, VOUT = 5V, TA= 25°C.
Parameter
Input Voltage VIN
Shutdown Quiescent Current
ISHDN
Quiescent Current IQ
Feedback Voltage VFB
Feedback Bias Current IFB
Switch Current Limit ILIM
Oscillator Frequency fOSC
Oscillator Frequency fOSC1
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Error Amplifier Voltage Gain GV
Error Amplifier
Transconductance GS
EN Pin Threshold High VH
EN Pin Threshold Low VL
EN Pin Input Leakage Current IEN
Internal PMOS ON Resistance
RDS(ON)
Maximum Duty Cycle DMAX
Thermal Shutdown TOTSD
Thermal Shutdown Hysteresis
THYS
Min.
4.75
0.784
2.5
336
1.5
Typ.
44
1.3
0.800
-0.1
3.4
420
40
1000
700
-5
130
155
20
Max.
25
60
2
0.816
-0.5
504
0.7
-10
150
100
Units
µA
mA
V
µA
A
kHz
kHz
V/V
µA/V
V
V
µA
m
%
°C
°C
Conditions
VEN=0.4V
VEN=2.0V, VFB=1.3V
VIN=5V to 25V
VFB=1.3V
VFB=0.52V, Current limit activated or
short circuit protection mode
VEN=2.5V
VIN= VEN=12V, VFB=0.65V, IOUT=12A
VFB=0.65V, ISW=0.1A
© 2009 Exar Corporation
2/11
Rev. 1.0.0


Part Number XRP7657
Description 25V Non Synchronous PWM Step Down Regulator
Maker Exar Corporation
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XRP7657 Datasheet PDF






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