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PIN ? DESCRIPTIONS ?
15A ? Highly ? Integrated ? SupIRBuck TM ?
IR3477 ?
PIN #
PIN NAME
I/O LEVEL
PIN DESCRIPTION
Forced ? Continuous ? Conduction ? Mode ? (CCM). ? Ground ? this ? pin ? to ? enable ? diode ?
1 ?
FCCM ?
3.3V ?
emulation ? mode ? or ? discontinuous ? conduction ? mode ? (DCM). ? Pull ? this ? pin ? to ? 3.3V ?
to ? operate ? in ? CCM ? under ? all ? load ? conditions. ?
2 ?
3 ?
4, ? 17 ?
5 ?
ISET ?
PGOOD ?
GND ?
FB ?
?
5V ?
Reference ?
3.3V ?
Connecting ? resistor ? to ? PHASE ? pin ? sets ? over ? current ? trip ? point. ?
Power ? good ? open ? drain ? output ? – ? pull ? up ? with ? a ? resistor ? to ? 3.3V ?
Bias ? return ? and ? signal ? reference. ?
Inverting ? input ? to ? PWM ? comparator, ? OVP ? / ? PGOOD ? sense. ?
Soft ? start/shutdown. ? This ? pin ? provides ? user ? programmable ? soft ‐ start ? function. ?
6 ?
SS ?
3.3V ?
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. ?
7 ?
8 ?
9 ?
10 ?
11 ?
12 ?
13 ?
14 ?
15 ?
16 ?
NC ?
3VCBP ?
NC ?
VCC ?
PGND ?
PHASE ?
VIN ?
BOOT ?
FF ?
EN ?
‐?
3.3V ?
‐?
5V ?
Reference ?
VIN ?
VIN ?
VIN ? + ? VCC ?
VIN ?
5V ?
‐?
For ? internal ? LDO. ? Bypass ? with ? a ? 1.0μF ? capacitor ? to ? GND. ??
‐?
VCC ? input. ? Gate ? drive ? supply. ? A ? minimum ? of ? 1.0μF ? ceramic ? capacitor ? is ? required. ?
Power ? return. ?
Phase ? node ? (or ? switching ? node) ? of ? MOSFET ? half ? bridge. ?
Input ? voltage ? for ? the ? system. ?
Bootstrapped ? gate ? drive ? supply ? – ? connect ? a ? capacitor ? to ? PHASE. ?
Input ? voltage ? feed ? forward ? – ? sets ? on ‐ time ? with ? a ? resistor ? to ? VIN. ?
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. ??
??
?
5
March ? 27, ? 2013 ?? | ??? V2.5 ?? | ?? PD97604
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