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  Microchip Technology Semiconductor Electronic Components Datasheet  


MCP1603

500 mA Synchronous Buck Regulator


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MCP1603
2.0 MHz, 500 mA Synchronous Buck Regulator
Features
• Over 90% Typical Efficiency
• Output Current Up To 500 mA
• Low Quiescent Current = 45 µA, typical
• Low Shutdown Current = 0.1 µA, typical
• Adjustable Output Voltage:
- 0.8V to 4.5V
• Fixed Output Voltage:
- 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V
• 2.0 MHz Fixed-Frequency PWM (Heavy Load)
• Automatic PWM to PFM Mode Transition
• 100% Duty Cycle Operation
• Internally Compensated
• Undervoltage Lockout (UVLO)
• Overtemperature Protection
• Space Saving Packages:
- 5-Lead TSOT
- 8-Lead 2X3 DFN
Applications
• Cellular Telephones
• Portable Computers
• Organizers / PDAs
• USB Powered Devices
• Digital Cameras
• Portable Equipment
• +5V or +3.3V Distributed Systems
General Description
The MCP1603 is a high efficient, fully integrated
500 mA synchronous buck regulator whose 2.7V to
5.5V input voltage range makes it ideally suited for
applications powered from 1-cell Li-Ion or 2-cell/3-cell
NiMH/NiCd batteries.
At heavy loads, the MCP1603 operates in the 2.0 MHz
fixed frequency PWM mode which provides a low
noise, low output ripple, small-size solution. When the
load is reduced to light levels, the MCP1603
automatically changes operation to a PFM mode to
minimize quiescent current draw from the battery. No
intervention is necessary for a smooth transition from
one mode to another. These two modes of operation
allow the MCP1603 to achieve the highest efficiency
over the entire operating current range.
The MCP1603 is available with either an adjustable or
fixed output voltage. The available fixed output voltage
options are 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V. When a
fixed option is used, only three additional small external
components are needed to form a complete solution.
Couple this with the low profile, small-foot print
packages and the entire system solution is achieved
with minimal size.
Additional protection features include: UVLO,
overtemperature, and overcurrent protection.
Package Types
5-Lead TSOT
8-Lead 2x3 DFN
VIN 1
5 LX
SHDN 1
5 VFB/VOUT
GND 2
GND 2
SHDN 3
4 VFB/VOUT
LX 3
4 VIN
MCP1603
MCP1603L
LX 1
NC 2
SHDN 3
VFB/VOUT 4
8 GND
7 VIN
6 NC
5 NC
© 2007 Microchip Technology Inc.
DS22042A-page 1



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MCP1603www.DataSheet4U.com
Typical Application Circuit
VIN
2.7V To 4.5V
CIN
4.7 µF
VIN LX
SHDN VFB
GND
L1 VOUT
4.7 µH 1.8V @ 500 mA
COUT
4.7 µF
100
95
VOUT = 1.8V
90
85 VIN = 3.6V
80
75
70
65
60 VIN = 4.5V
55
50
VIN = 2.7V
0.1 1 10 100 1000
Output Current (mA)
DS22042A-page 2
© 2007 Microchip Technology Inc.



Part Number MCP1603
Description 500 mA Synchronous Buck Regulator
Maker Microchip Technology - Microchip Technology
Total Page 26 Pages
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