MIC4742 Datasheet, PDF (3/23 Pages) Micrel Semiconductor – 2 MHz Dual 2A Integrated Switch Buck Regulator

Micrel, Inc.
MIC4742
Pin Description
Pin Number
(MLF^®)
1
Pin Number
(EPAD-TSSOP)
7
2⁽¹⁾
8⁽¹⁾
3,4
9,10
5
11
6,15
5,12
7,14
4,13
8
14
9,10
11⁽¹⁾
15,16
1⁽¹⁾
12
2
13
3
16
6
EPAD
EPAD
Note:
1. Do not float Enable Input.
Pin Name Pin Function
FB2
EN2
SW2
PGND2
VIN2
VIN1
PGND1
SW1
EN1
FB1
SGND
BIAS
GND
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 less than 5µA (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 less than 5µA (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.
March 2009
3
M9999-030209-D