mic4742 Micrel Semiconductor, mic4742 Datasheet - Page 3

• Manufacturer Part Number: mic4742
• Description: 2 Mhz Dual 2a Integrated Switch Buck Regulator
• Manufacturer: Micrel Semiconductor

Micrel, Inc.
Pin Description
Note:
1. Do not float Enable Input.
December 2008
Pin Number
(MLF
6,15
7,14
9,10
11
2
3,4
EP
12
13
16
1
5
8
(1)
(1)
®
)
(EPAD-TSSOP)
Pin Number
15,16
9,10
5,12
4,13
8
1
EP
11
14
7
2
3
6
(1)
(1)
Pin Name
PGND2
PGND1
SGND
BIAS
SW2
VIN2
VIN1
SW1
GND
EN2
EN1
FB2
FB1
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).
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.
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.
Pin Function
Switch for output 2 (Output): Internal power P-Channel MOSFET output switch
Switch for output 1 (Output): Internal power P-Channel MOSFET output switch
3
M9999-120908-B
MIC4742