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XRP7665 Datasheet Preview

XRP7665 Datasheet

3A 18V Synchronous Step-Down Converter

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XRP7665
3A 18V Synchronous Step-Down Converter
March 2013
GENERAL DESCRIPTION
The XRP7665 is a synchronous current-mode
PWM step down (buck) regulator capable of a
constant output current up to 3 Amps. A wide
4.50V to 18V input voltage range allows for
single supply operations from industry
standard 5V and 12V power rails.
With a 340kHz constant operating frequency
and integrated high and low side
100mΩ/90mΩ MOSFETs, the XRP7665 reduces
the overall component count and solution
footprint. Current-mode control provides fast
transient response and cycle-by-cycle current
limit. An adjustable soft-start prevents inrush
current at turn-on, and in shutdown mode the
supply current drops to 0.1µA.
Built-in output over voltage (open load), over
temperature, cycle-by-cycle over current and
under voltage lockout (UVLO) protections
insure safe operations under abnormal
operating conditions.
The XRP7665 is a pin and function compatible
device to MP1484 and a 3A pin to pin upgrade
to XRP7664.
The XRP7665 is offered in a RoHS compliant,
“green”/halogen free 8-pin exposed pad SOIC
package.
Rev. 2.0.1
APPLICATIONS
Distributed Power Architectures
Point of Load Converters
Audio-Video Equipments
Medical & Industrial Equipments
FEATURES
Pin/Function Compatible to MP1484
3A Continuous Output Current
4.50V to 18V Wide Input Voltage
PWM Current Mode Control
340kHz Constant Operations
Up to 93% Efficiency
Adjustable Output Voltage
0.925V to 16V Range
2.0% Accuracy
Programmable Soft-Start and Enable
Function
Built-in Thermal, Over Current, UVLO
and Output Over Voltage Protections
RoHS Compliant “Green”/Halogen Free
8-Pin Exposed Pad SOIC Package
TYPICAL APPLICATION DIAGRAM
Fig. 1: XRP7665 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

XRP7665 Datasheet Preview

XRP7665 Datasheet

3A 18V Synchronous Step-Down Converter

No Preview Available !

XRP7665
3A 18V Synchronous Step-Down Converter
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.
Supply Voltage VIN...................................... -0.3V to 20V
Switch Node Voltage VSW ......................................... 21V
Boost Voltage VBS ................................... -0.3 to VSW+6V
Enable Voltage VEN......................................... -0.3 to VIN
All Other Pins .............................................. -0.3 to +6V
Junction Temperature .......................................... 150°C
Storage Temperature .............................. -65°C to 150°C
Lead Temperature (Soldering, 10 sec) ................... 260°C
ESD Rating (HBM - Human Body Model) .................... 2kV
ESD Rating (MM - Machine Model) ...........................200V
Moisture Sensitivity Level (MSL) ................................... 3
OPERATING RATINGS
Input Voltage VIN ....................................... 4.50V to 18V
Ambient Operating Temperature ................ -40°C to 85°C
Maximum Output Current.................................... 3A min
Thermal Resistance θJA ...................................... 60°C/W
ELECTRICAL SPECIFICATIONS
Specifications are for an Operating Ambient Temperature of TA = 25°C only; limits applying over the full Ambient Operating
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 = VEN = 12V, VOUT=3.3V.
Parameter
Shutdown Supply Current
Quiescent Current
Feedback Voltage VFB
Feedback Overvoltage Threshold
Feedback Bias Current
Error Amplifier Voltage Gain AEA
(Note 1)
Error Amplifier
Transconductance GEA
High-Side switch On Resistance
RDSONH (Note 2)
Low-Side switch On Resistance
RDSONL (Note 2)
High-Side switch Leakage
Current
High-Side Switch Current Limit
Low-Side Switch Current Limit
COMP to Current Sense
Transconductance GCS
Oscillator Frequency FOSC1
Short Circuit Oscillator
Frequency FOSC2
Maximum Duty Cycle DMAX
Minimum Duty Cycle DMIN
EN Enable Threshold Voltage
EN Enable Threshold Voltage
Hysteresis (Note 1)
UVLO Threshold
Min.
0.907
-0.1
4.3
280
2.2
3.65
Typ.
0.1
1.2
0.925
1.1
400
800
100
100
0.1
5.6
1.4
5.2
340
90
90
2.5
210
4.00
Max.
10
1.4
0.943
0.1
10
400
0
2.7
4.25
Units
µA
mA
V
V
µA
V/V
µA/V
mΩ
mΩ
µA
A
A
A/V
kHz
kHz
%
%
V
mV
V
Conditions
VEN0.75V
VEN=3V, VFB=1V
VFB=1V
ISW=0.2A&0.7A
ISW=-0.2A&-0.7A
VIN=18V, VEN=0V, VSW=0V
From Drain to Source
VFB=0.85V
VFB=1V
VIN Rising
© 2013 Exar Corporation
2/12
Rev. 2.0.1


Part Number XRP7665
Description 3A 18V Synchronous Step-Down Converter
Maker Exar
Total Page 12 Pages
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