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What is XRP7662?

This electronic component, produced by the manufacturer "Exar", performs the same function as "12A 300KHz Synchronous Step Down Regulator".


XRP7662 Datasheet PDF - Exar

Part Number XRP7662
Description 12A 300KHz Synchronous Step Down Regulator
Manufacturers Exar 
Logo Exar Logo 


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XRP7662
PowerBloxTM
12A 300KHz Synchronous Step Down Regulator
September 2012
Rev. 2.2.0
GENERAL DESCRIPTION
APPLICATIONS
The XRP7662 is a synchronous voltage mode
PWM step down (buck) regulator capable of a
constant output current up to 12 Amps. A wide
5V to 22V single input voltage range allows for
single supply operations from industry
standard 5V, 12V and 18V power rails.
Operations down to 3V are supported with an
additional biasing voltage.
Distributed Power Architectures
Point of Load Converters
Power Supply Modules
FPGAs, DSPs and Processors Supplies
FEATURES
With a 300kHz constant operating frequency
and integrated high and low side switch, the
XRP7662 reduces the overall component count
and solution footprint. In addition to a 1%
output set-point 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.
12A Continuous Current
5V-22V Single Input Voltage Rail
3V-22V Input Voltage with 5V Bias
PWM Voltage Mode Control
300kHz Fixed Synchronous Operations
Low RDSON Power Switches
0.8V Min. Output Voltage 1% Accuracy
Built-in current limiting, UVLO, output short-
circuit and over temperature protection insure
safe operation under abnormal operating
conditions.
The XRP7662 is offered in a RoHS compliant,
lead free 26-pin 7mmx4mm DFN package.
Type II & III Compensations Support
Programmable Soft Start
Over Temperature & Short Circuit
Protection/Auto-Restart
Current Limiting
RoHS Compliant Lead Free 26-Pin DFN
US Patent #6,922,041
TYPICAL APPLICATION DIAGRAM
Fig. 1: XRP7662 Application Diagram
Exar Corporation
48720 Kato Road, Fremont CA 94538, USA
www.exar.com
Tel. +1 510 668-7000 Fax. +1 510 668-7001

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XRP7662 equivalent
XRP7662
PowerBloxTM
12A 300KHz Synchronous Step Down Regulator
PIN DESCRIPTION
Name
PGND
GND
VFB
COMP
SS
ISN
ISP
SWN
VINP
LX
BST
VIN
UVIN
VCC
Pin Number
1-4
5,9,19,20,28
6
7
8
10
11
12
13, 29
14-16, 23-27
17
18
21
22
Description
Ground connection for the synchronous rectifier.
Ground Pin. The control circuitry of the IC and lower power driver are referenced to this
pin. Return separately from other ground traces to the (-) terminal of COUT.
Feedback Voltage and Short Circuit Detection pin. It is the inverting input of the Error
Amplifier and serves as the output voltage feedback point for the Buck Converter. The
output voltage is sensed and can be adjusted through an external resistor divider.
Whenever VFB drops 0.25V below the positive reference, a short circuit fault is detected
and the IC enters hiccup mode.
Output of the Error Amplifier. It is internally connected to the inverting input of the
PWM comparator. An optimal filter combination is chosen and connected to this pin and
either ground or VFB to stabilize the voltage mode loop.
Soft Start. Connect an external capacitor between SS and GND to set the soft start rate
based on the 10μA source current. The SS pin is held low via a 1mA (min) current
during all fault conditions.
Current sense negative input. Rail-to-rail input for over current detection.
Current sense positive input. Rail-to-rail input for over current detection.
Lower supply rail for the GH high-side gate driver. Connect this pin to the switching
node as close as possible to pins 23- 27. Do not connect this pin to pins 14 16.
Input connection to the high side N-channel MOSFET.
Connect an inductor between this pin and VOUT.
High side driver supply pin. Connect BST to the external boost diode and capacitor as
shown in the Typical Application Circuit on page 1. The high side driver is connected
between BST pin and SWN pin.
VIN connection for internal LDO and PWM Controller.
UVLO input for VIN voltage. Connect a resistor divider between VIN and UVIN to set
minimum operating voltage. Use resistor values below 20kΩ to override internal resistor
divider.
Output of internal regulator. May be externally biased if VIN < 5V. A 4.7uF or higher
ceramic capacitor should be connected to this pin close to the device.
ORDERING INFORMATION
Part Number
XRP7662IH-F
XRP7662IHTR-F
XRP7662EVB
Junction
Temperature
Range
Marking
XRP7662IH
-40°C≤TJ≤+125°C
YYWWF
X
XRP7662 Evaluation Board
Package
26-pin DFN
Packing
Quantity
Note 1
Bulk
3K/Tape & Reel Lead Free
“YY” = Year – “WW” = Work Week – “X” = Lot Number – when applicable.
Note 2
© 2012 Exar Corporation
5/19
Rev. 2.2.0


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