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MIC24420 Datasheet(PDF) 2 Page - Micrel Semiconductor

Part No. MIC24420
Description  2.5A Dual Output PWM Synchronous Buck Regulator IC
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Manufacturer  MICREL [Micrel Semiconductor]
Direct Link  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MIC24420 Datasheet(HTML) 2 Page - Micrel Semiconductor

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Micrel, Inc.
MIC24420/MIC24421
June 2012
2
M9999-062012-C
Ordering Information
Part Number
Voltage
Switching
Frequency
Temperature Range
Package
Lead Finish
MIC24420YML
Adj
1MHz
-40
°C to +125°C
24-Pin 4mm x 4mm MLF
®
Pb-Free
MIC24421YML
Adj
500kHz
-40
°C to +125°C
24-Pin 4mm x 4mm MLF
®
Pb-Free
Notes:
1. MLF
® is GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
2. MLF
®
= Pin 1 identifier
Pin Configuration
24-Pin 4mm x 4mm MLF (ML)
Pin Description
Pin Number
Pin Name
Pin Description
1
BST1
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.
2
LSD1
Low-side Drive 1 (Output): External low-side N-Channel MOSFET driver. Use 4.5V rated
MOSFETs.
3
PGND1
Power Ground 1 (Input).
4
CS1
Current Sense 1 (Input): Place a resistor from SW1 to this pin to program the current limit point
from 0.5A to 2.7A.
5
PG1
Power Good 1 (Output): Open drain. Device is in the OFF state. i.e. high when output is within
90% of regulation.
6
EN/DLY1
Enable/Delay 1 (Input): This pin can be used to disable VOUT1. When used to disable VOUT1, 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 Functional Description
section for additional information.
7
COMP1
Compensation 1 (Input): Pin for external compensation, Channel 1.
8
FB1
Feedback 1 (Input): Input to Ch1 error amplifier. Regulates to 0.7V.
9
AVDD
5V Internal Linear Regulator (Output): Connect to an external 4.7µF bypass capacitor. When
VIN is <6V, this regulator operates in drop-out mode. Connect AVDD to VIN when VIN <6V.
10
AGND
Analog Ground (Input): Control section ground. Connect to PGND.
11
FB2
Feedback 2 (Input): Input to Channel 2 error amplifier. Regulates to 0.7V.
12
COMP2
Compensation 2 (Input): Pin for external compensation, Channel 2.


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