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  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP1612 Datasheet

1.4 MHz Synchronous Buck Regulator

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MCP1612 pdf
MCP1612
Single 1A, 1.4 MHz Synchronous Buck Regulator
Features
• Fixed Switching Frequency: 1.4 MHz
• Input Operating Voltage Range: 2.7V to 5.5V
• Integrated Buck and Synchronous Switches
• Adjustable-Output Voltage Range: 0.8V to 5.0V
www.DataSheet4U.com• 100% Duty Cycle Capable for Low Input Voltage
• Continuous Output Current Capability: 1A
• Shutdown Control with IQ < 0.01 µA (Typ.)
• Integrated Soft-Start Feature
• Integrated Undervoltage Lockout (UVLO)
Protection
• Integrated Overtemperature Protection
• Fast Dynamic Response to Line and Load Steps
• Small, 8-Pin DFN and MSOP Packages
• Operating Temperature Range: -40°C to +85°C
Applications
• Network Interface Cards
• Portable Computers
• Set-Top Boxes
• DSL Modems and Routers
• USB-Powered Devices
• GBIC Modules
• High-Speed Data System Bus Termination
• Medical Instruments
• Cellular/GSM/PHS Phones
• +5V or +3.3V Distributed Voltages
Description
The MCP1612 is a 1A, 1.4 MHz, fully-integrated,
current mode-controlled, synchronous buck regulator.
The MCP1612 is packaged in the 8-pin MSOP and
space-saving, 3x3 DFN packages. The DFN package
also provides a lower thermal resistance package
option for high-power, high ambient temperature
applications. With an input operating range from 2.7V
to 5.5V, the MCP1612 is ideal for applications that are
powered by one single-cell Li-Ion, 2- to 3-cell NiMH,
NiCd or alkaline sources.
The output voltage of the MCP1612 is easily set over
the range of 0.8V to 5.0V by using an external resistor
divider. The external inductor and output capacitor size
are minimized due to an internally-fixed, 1.4 MHz clock
being used to set the switching frequency. The fixed
clock allows for continuous, fixed-frequency PWM
operation over the full load range.
The MCP1612 is designed to provide fast dynamic
response to sudden changes in input voltage and load
current to minimize the necessary amount of external
output capacitance.
The MCP1612 can be used with ceramic, tantalum or
aluminum electrolytic output capacitors. Ceramic
capacitors with values as low as 4.7 µF can be used to
keep the output ripple voltage low. For applications that
require better load step performance, the value of the
output capacitor can be increased to 47 µF.
Additional features integrated into the MCP1612
include shutdown capability, soft-start, UVLO,
overcurrent and overtemperature protection.
Package Types
8-Lead DFN
8-Lead MSOP
VIN 1
VCC 2
SHDN 3
COMP 4
8 LX
7 PGND
6 AGND
5 FB
VIN 1
VCC 2
SHDN 3
COMP 4
8 LX
7 PGND
6 AGND
5 FB
© 2005 Microchip Technology Inc.
DS21921B-page 1



  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP1612 Datasheet

1.4 MHz Synchronous Buck Regulator

No Preview Available !

MCP1612 pdf
MCP1612
Functional Block Diagram
VCC
www.DataSheet4U.com
Comp
FB
AGND
Undervoltage
Lockout
(UVLO)
UVLO
Slope Comp.
+
+
Peak Current
Limit
VREF
gm
+
ISENSE P-Channel
Disable
INSET
Circuit
IN
PDRV
NDRV
VIN
LX
Soft-
Disable Start
1.4 MHz Clock
VCC
VCC
1.2V
A VBG
Leading-
Edge
Blank
Disable
VREF
Peak Current
Limit
PGND
PGND
Disable
UVLO
SHDN
0.8V
AGND
Thermal
Shutdown
AGND
DS21921B-page 2
© 2005 Microchip Technology Inc.



  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP1612 Datasheet

1.4 MHz Synchronous Buck Regulator

No Preview Available !

MCP1612 pdf
MCP1612
Typical Application Circuit
MCP1612 3.3V to 1.2V Synchronous Buck Converter
www.DataSheet4U.com
3.3 VIN ±10%
CIN
10 µF
Ceramic
ON
OFF
CBYP
0.1 µF
Ceramic
1
VIN
MCP1612
10Ω
8 L = 3.3 µH
Lx
2
VCC
PGND 7
3
SHDN
6
AGND
4
Comp
5
FB
1.2V VOUT @ 1A
COUT
10 µF
Ceramic
100 kΩ
200 kΩ
25 kΩ
1000 pF
© 2005 Microchip Technology Inc.
DS21921B-page 3




Part Number MCP1612
Description 1.4 MHz Synchronous Buck Regulator
Maker Microchip Technology
Total Page 22 Pages
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