MIC4782 Datasheet, PDF (3/23 Pages) Micrel Semiconductor – 1.8 MHz Dual 2A Integrated Switch Buck Regulator

Micrel, Inc.
MIC4782
Pin Description
Pin Number
1
Pin Name
FB2
2⁽¹⁾
EN2
3,4
SW2
5
PGND2
6,15
VIN2
7,14
VIN1
8
PGND1
9,10
11⁽¹⁾
SW1
EN1
12
FB1
13
SGND
16
BIAS
EPAD
GND
Note:
1. Do not float Enable Input.
Pin Function
Feedback for output 2 (Input). Input to the error amplifier, connect to the external resistor
divider network to set the output voltage.
Enable for output 2 (Input). Logic level low, will shutdown the device, reducing the current
draw to 1.6µA typical. (both EN1 and EN2 are low).
Switch for output 2 (Output): Internal power P-Channel MOSFET output switch
Power Ground for output 2. Provides the ground return path for the high-side drive current.
PGND1 pin and PGND2 pin are internally connected by anti-parallel diodes.
Supply Voltage for output 2 (Input): Supply voltage for the source of the internal P-channel
MOSFET and driver. Requires bypass capacitor-to-GND.
VIN1 pins and VIN2 pins are internally connected by anti-parallel diodes.
Supply Voltage for output 1 (Input): Supply voltage for the source of the internal P-channel
MOSFET and driver. Requires bypass capacitor-to-GND.
VIN1 pins and VIN2 pins are internally connected by anti-parallel diodes.
Power Ground for output 1. Provides the ground return path for the high-side drive
current.
PGND1 pin and PGND2 pin are internally connected by anti-parallel diodes.
Switch for output 1 (Output): Internal power P-Channel MOSFET output switch
Enable for output 1 (Input). Logic level low, will shutdown the device, reducing the current
draw to 1.6µA typical. (both EN1 and EN2 are low).
Feedback for output 1 (Input). Input to the error amplifier, connect to the external resistor
divider network to set the output voltage.
Signal (Analog) Ground. Provides return path for control circuitry and internal reference.
Internal circuit bias supply. Must be bypassed with a 0.1µF ceramic capacitor-to-SGND.
Biased through a 10Ω resistor to VIN.
Connect to ground.
August 2009
3
M9999-081709-D