IR3894MTR1PBF International Rectifier, IR3894MTR1PBF Datasheet - Page 4

• Manufacturer Part Number: IR3894MTR1PBF
• Description: 12A Highly Integrated Single-Input Voltage, Synchronous Buck Regulator in a PQFN package.
• Manufacturer: International Rectifier

Specifications of IR3894MTR1PBF

• Part Status: Active and Preferred
• Package: PQFN / 5 x 6
• Circuit: Single Output
• Iout (a): 12
• Switch Freq (khz): 0 - 1500
• Input Range (v): 1.0 - 16
• Output Range (v): 0.5 - 12
• Pbf: PbF Option Available

PIN DESCRIPTIONS
PIN #
10
11
12
13
14
15
16
17
4
1
2
3
4
5
6
7
8
9
FEBRUARY 01, 2012 | DATA SHEET | Rev 3.0
PIN NAME
Vcc/LDO_Out
Rt/Sync
PGood
Enable
Comp
S_Ctrl
PGnd
Vsns
PVin
Boot
Vref
Gnd
Gnd
Vin
SW
Vp
Fb
Single‐Input Voltage, Synchronous Buck Regulator
Inverting input to the error amplifier. This pin is connected directly to the output
of the regulator via resistor divider to set the output voltage and provide
feedback to the error amplifier.
Internal reference voltage , it can be used for margining operation also. A
minimum value of 100pF ceramic capacitor is recommended between this pin
and Gnd. Tie to Gnd for tracking function.
Output of error amplifier. An external resistor and capacitor network is typically
connected from this pin to Fb to provide loop compensation.
Signal ground for internal reference and control circuitry.
Multi‐function pin to set switching frequency. Use an external resistor from this
pin to Gnd to set the free‐running switching frequency. An external clock signal
to connect to this pin through a diode, the device’s switching frequency is
synchronized with the external clock.
Soft start/stop control. A high logic input enables the device to go into the
internal soft start; a low logic input enables the output soft discharged. Pull this
pin to Vcc if this function is not used.
Power Good status pin. Output is open drain. Connect a pull up resistor from
this pin to Vcc.
Sense pin for over‐voltage protection and PGood. It is optional to tie this pin to
Fb pin directly instead of using a resistor divider from Vout.
Input voltage for Internal LDO. A 1.0µF capacitor should be connected between
this pin and PGnd. If external supply is connected to Vcc/LDO_out pin, this pin
should be shorted to Vcc/LDO_Out pin.
Input Bias Voltage, output of internal LDO. Place a minimum 2.2µF cap from this
pin to PGnd.
Power Ground. This pin serves as a separated ground for the MOSFET drivers
and should be connected to the system’s power ground plane.
Switch node. This pin is connected to the output inductor.
Input voltage for power stage.
Supply voltage for high side driver, a 100nF capacitor should be connected
between this pin and SW pin.
Enable pin to turn on and off the device, if this pin is connected to PVin pin
through a resistor divider, input voltage UVLO can be implemented.
Input to error amplifier for tracking purposes. It can be left floating for non‐
tracking applications and no external capacitor is required.
Signal ground for internal reference and control circuitry.
- 4 -`
12A Highly Integrated SupIRBuck
PIN DESCRIPTION
IR3894
PD‐97745