ADP3051 Down DC-DC Datasheet

ADP3051 Datasheet, PDF, Equivalent


Part Number

ADP3051

Description

PWM Step Down DC-DC

Manufacture

Analog Devices

Total Page 16 Pages
Datasheet
Download ADP3051 Datasheet


ADP3051
FEATURES
Current mode control for simple loop compensation
Input voltage range: 2.7 V to 5.5 V
Output voltage range: 0.8 V to 5.5 V
Tri-Mode™ operation for high efficiency
550 kHz PWM operating frequency
High accuracy over line, load, and temperature
Micropower shutdown mode
Space-saving MSOP-8 package
APPLICATIONS
Li-ion powered handhelds
MP3 players
PDAs and palmtops
Consumer electronics
500 mA PWM Step-Down DC-DC with
Synchronous Rectifier
ADP3051
GENERAL DESCRIPTION
The ADP3051 is a low noise, current mode, pulse width modu-
lator (PWM) step-down converter capable of supplying over
500 mA to output voltages as low as 0.8 V. This device integrates
a low resistance power switch and synchronous rectifier, provid-
ing excellent efficiency over the entire output voltage range and
eliminating the need for a large and costly external Schottky
rectifier. Its 550 kHz switching frequency permits the use of
small external components.
Current mode control and external compensation allow the
regulator to be easily optimized for a wide range of operating
conditions. The ADP3051 operates at a constant 550 kHz
frequency at medium to heavy loads; it smoothly transitions
into Tri-Mode operation to save power at light loads. A pin-
controlled micropower shutdown mode is also included.
The ADP3051’s 2.7 V to 5.5 V input operating range makes it
ideal for both battery-powered applications as well as those with
3.3 V or 5 V supply buses. It is available in a space-saving, 8-lead
MSOP package.
VIN 3.3V
10µF
10k
270pF
TYPICAL APPLICATION CIRCUIT
ADP3051
4 IN
SW 3
7 SHDN
10µH
12.5k
6 COMP
FB 5
27pF
PGND
2
GND
8
10k
VOUT 1.8V
10µF
Figure 1.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable.
However, no responsibility is assumed by Analog Devices for its use, nor for any
infringements of patents or other rights of third parties that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
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Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved.

ADP3051
ADP3051
TABLE OF CONTENTS
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 4
ESD Caution.................................................................................. 4
Pin Configuration and Function Descriptions............................. 5
Typical Performance Characteristics ............................................. 6
Theory of Operation ........................................................................ 9
PWM Control Mode .................................................................... 9
Tri-Mode Operation..................................................................... 9
100% Duty Cycle Operation ..................................................... 10
Shutdown..................................................................................... 10
REVISION HISTORY
6/04—Revision 0: Initial Version
Undervoltage Lockout (UVLO) ............................................... 10
Short-Circuit Protection and Recovery................................... 10
Applications..................................................................................... 11
Recommended Components .................................................... 11
Design Procedure ....................................................................... 11
Output Capacitor Selection....................................................... 12
Circuit Board Layout Considerations...................................... 13
Outline Dimensions ....................................................................... 15
Ordering Guide .......................................................................... 15
Rev. 0 | Page 2 of 16


Features 500 mA PWM Step-Down DC-DC with Synchron ous Rectifier ADP3051 FEATURES Current mode control for simple loop compensati on Input voltage range: 2.7 V to 5.5 V Output voltage range: 0.8 V to 5.5 V Tr i-Mode™ operation for high efficiency 550 kHz PWM operating frequency High a ccuracy over line, load, and temperatur e Micropower shutdown mode Space-saving MSOP-8 package GENERAL DESCRIPTION Th e ADP3051 is a low noise, current mode, pulse width modulator (PWM) step-down converter capable of supplying over 500 mA to output voltages as low as 0.8 V. This device integrates a low resistanc e power switch and synchronous rectifie r, providing excellent efficiency over the entire output voltage range and eli minating the need for a large and costl y external Schottky rectifier. Its 550 kHz switching frequency permits the use of small external components. Current mode control and external compensation allow the regulator to be easily optimi zed for a wide range of operating conditions. The ADP3051 operate.
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