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IR3476 Datasheet(PDF) 5 Page - International Rectifier

Part # IR3476
Description  Compensation Loop not Required
Download  21 Pages
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Manufacturer  IRF [International Rectifier]
Direct Link  http://www.irf.com
Logo IRF - International Rectifier

IR3476 Datasheet(HTML) 5 Page - International Rectifier

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March 27, 2013  |  V2.2  |  PD97603
5
IR3476 
12A Highly Integrated SupIRBuck
TM 
PIN DESCRIPTIONS 
PIN #
PIN NAME
I/O LEVEL
PIN DESCRIPTION
FCCM 
3.3V 
Forced Continuous Conduction Mode (CCM). Ground this pin to enable diode 
emulation mode or discontinuous conduction mode (DCM). Pull this pin to 3.3V 
to operate in CCM under all load conditions. 
ISET  
Connecting resistor to PHASE pin sets over current trip point. 
PGOOD 
5V 
Power good open drain output – pull up with a resistor to 3.3V 
4, 17 
GND 
Reference 
Bias return and signal reference. 
FB 
3.3V 
Inverting input to PWM comparator, OVP / PGOOD sense. 
SS 
3.3V 
Soft start/shutdown. This pin provides user programmable soft‐start function. 
Connect an external capacitor from this pin to GND to set the startup time of the 
output voltage. The converter can be shutdown by pulling this pin below 0.3V. 
NC 
‐ 
‐ 
3VCBP 
3.3V 
For internal LDO. Bypass with a 1.0µF capacitor to GND.  
NC 
‐ 
‐ 
10 
VCC 
5V 
VCC input. Gate drive supply. A minimum of 1.0µF ceramic capacitor is required. 
11 
PGND 
Reference 
Power return. 
12 
PHASE 
VIN 
Phase node (or switching node) of MOSFET half bridge. 
13 
VIN 
VIN 
Input voltage for the system. 
14 
BOOT 
VIN + VCC 
Bootstrapped gate drive supply – connect a capacitor to PHASE. 
15 
FF 
VIN 
Input voltage feed forward – sets on‐time with a resistor to VIN. 
16 
EN 
5V 
Enable pin to turn on and off the device. Use two external resistors to set the 
turn on threshold (see Electrical Specifications) for input voltage monitoring.  
  
 


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