Regulator IC. MIC24421 Datasheet

MIC24421 IC. Datasheet pdf. Equivalent

MIC24421 Datasheet
Recommendation MIC24421 Datasheet
Part MIC24421
Description 2.5A Dual Output PWM Synchronous Buck Regulator IC
Feature MIC24421; MIC24420/MIC24421 2.5A Dual Output PWM Synchronous Buck Regulator IC General Description Features .
Manufacture Micrel Semiconductor
Datasheet
Download MIC24421 Datasheet





Micrel Semiconductor MIC24421
MIC24420/MIC24421
2.5A Dual Output PWM Synchronous
Buck Regulator IC
General Description
Features
The MIC24420/MIC24421 are synchronous PWM dual
output step down converters with internal 2.5A high-side
switches. The MIC24420/MIC24421 has an integrated low-
side gate driver for synchronous step-down conversion by
connecting an external N-channel MOSFET to achieve
high efficiencies in low duty-cycle applications.
The MIC24420 switching frequency is 1MHz and the
MIC24421 switching frequency is 500kHz. A patented
control scheme allows the use of a wide range of output
capacitance from small ceramic capacitors to large
electrolytic types with only one compensation component.
A 2% output voltage tolerance over the temperature range
allows the maximum level of system performance. The
MIC24420/MIC24421 power good signal allows full control
for sequencing the output voltages with minimum external
components.
An adjustable current limit allows the use of smaller
inductors in lower current applications.
The MIC24420/MIC24421 is available in a ePad 24-pin
4mm x 4mm MLF® package, and has an operating junction
temperature range of –40°C to +125°C.
4.5V to 15V input voltage range
Adjustable output voltages down to 0.7V
2.5A per channel
180° out of phase operation
Pre-biased output startup capability
Low-side driver for synchronous operation
2% output voltage accuracy (over temperature)
500kHz (MIC24421) and 1MHz (MIC24420) switching
frequency
Output voltage sequencing
Programmable max current limit
Power good output
Ramp Control™ provides soft-start
Low-side current sensing allows very low duty-cycle
Works with ceramic output capacitors
24-pin 4mm x 4mm MLF® package
Junction temperature range of –40°C to +125°C
Applications
Multi-output power supplies with sequencing
DSP, FPGA, CPU and ASIC power supplies
Telecom and networking equipment, servers
_________________________________________________________________________________________________________________________
Typical Application
MIC24420 Dual Output Buck Converter
Ramp Control is a trademark of Micrel, Inc.
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
June 2012
M9999-062012-C



Micrel Semiconductor MIC24421
Micrel, Inc.
MIC24420/MIC24421
Ordering Information
Part Number
MIC24420YML
MIC24421YML
Voltage
Adj
Adj
Switching
Frequency
1MHz
500kHz
Temperature Range
-40°C to +125°C
-40°C to +125°C
Package
24-Pin 4mm x 4mm MLF®
24-Pin 4mm x 4mm MLF®
Notes:
1. MLF® is GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
2. MLF® z= Pin 1 identifier
Pin Configuration
Lead Finish
Pb-Free
Pb-Free
24-Pin 4mm x 4mm MLF (ML)
Pin Description
Pin Number Pin Name
1 BST1
2 LSD1
3 PGND1
4 CS1
5 PG1
6 EN/DLY1
7 COMP1
8 FB1
9 AVDD
10 AGND
11 FB2
12 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 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.
Compensation 1 (Input): Pin for external compensation, Channel 1.
Feedback 1 (Input): Input to Ch1 error amplifier. Regulates to 0.7V.
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.
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.
June 2012
2 M9999-062012-C



Micrel Semiconductor MIC24421
Micrel, Inc.
MIC24420/MIC24421
Pin Description (Continued)
Pin Number
13
14
15
16
17
18
19
20
21
22
23
24
EP
Pin Name
EN/DLY2
PG2
CS2
PGND2
LSD2
BST2
SW2
VIND2
PVDD
VIN
VIND1
SW1
ePad
Pin Description
Enable/Delay 2 (Input): This pin can be used to disable VOUT2. When used to disable VOUT2, 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.
Power Good 2 (Output) Open drain. Device is in the OFF state. i.e. high when output is within
90% of regulation
Current Sense 2 (Input) Place a resistor from SW2 to this pin to program the current limit point
from 0.5A to 2.7A
Power Ground 2 (Input)
Low-side Drive 2 (Output): External low-side N-Channel MOSFET driver. Use 4.5V rated
MOSFETs.
Boost 2 (Input): Provides voltage for high-side internal MOSFET for Channel 2. Connect a
0.01µF capacitor from SW2 to BST2 pin and a diode to PVDD.
Switch Node 2 (Output): Source of internal high-side power MOSFET.
Supply voltage (Input): For the drain of internal high-side power MOSFET 4.5V to 13.2V.
5V VDD input (input): Power connection to the internal MOSFET drivers. Connect to AVDD
through an RC filter
Supply voltage (Input): For the internal 5V linear regulator. 4.5V to 13.2V.
Supply voltage (Input): For the drain of internal high-side power MOSFET 4.5V to 13.2V.
Switch Node 1 (Output): Source of internal high-side power MOSFET.
Exposed thermal pad for package only. Connect to ground. Must make a full connection to the
ground plane to maximize thermal performance of the package.
June 2012
3 M9999-062012-C





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