MIC25400 Datasheet, PDF (2/27 Pages) Micrel Semiconductor – 2A Dual Output PWM Synchronous Buck Regulator IC

Micrel, Inc.
Ordering Information
Part Number
MIC25400YML
Voltage
Adj
Switching
Frequency
1MHz
Temperature Range
-40°C to +125°C
Package
24-Pin 4mm x 4mm MLF^®
MIC25400
Lead Finish
Pb-Free
Pin Configuration
24-Pin 4mm x 4mm MLF^® (ML)
Pin Description
Pin Number
1
2
3
4
5
6
7
8
9
10
11
12
Pin Name
BST1
LSD1
PGND1
CS1
PG1
EN/DLY1
COMP1
FB1
NC
AGND
FB2
COMP2
Pin Description
Boost 1 (Input): Provides voltage for high-side internal MOSFET for
channel 1. Connect a 0.01µF capacitor from SW1 to BST1 pin and a
diode-to-PVDD.
Low-side Drive 1 (Output): External low-side N-Channel MOSFET
driver. Use 4.5V rated MOSFETs.
Power Ground 1 (Input).
Current Sense 1 (Input): Place a resistor from SW1 to this pin to
program the current limit point from 0.5A to 2.7A.
Power Good 1 (Output): Open drain. Device is in the OFF state. i.e.,
high when output is within 90% of regulation.
Enable/Delay 1 (Input): This pin can be used to disable V_OUT1. When
used to disable V_OUT1, this pin must be pulled down to ground in less
than 1µs for proper operation. It is also used for soft-start of the
output. Soft start capacitor range is 4.7nf to 22nf. See the Functional
Description section of this datasheet for additional information.
Compensation 1 (Input): Pin for external compensation, Channel 1.
Feedback 1 (Input): Input to Ch1 error amplifier. Regulates to 0.7V.
No Connect.
Analog Ground (Input): Control section ground. Connect to PGND.
Feedback 2 (Input): Input to Channel 2 error amplifier. Regulates to
0.7V.
Compensation 2 (Input): Pin for external compensation, Channel 2.
January 2011
2
M9999-020111-C