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Analog Devices - High Efficiency Dual Output Power Supply Controller

Numéro de référence ADP3025JRU-REEL
Description High Efficiency Dual Output Power Supply Controller
Fabricant Analog Devices 
Logo Analog Devices 





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ADP3025JRU-REEL fiche technique
FEATURES
Wide input voltage range: 5.5 V to 25 V
High conversion efficiency > 96%
Integrated current sense—no external resistor required
Low shutdown current: 19 µA (typical)
Voltage mode PWM with input feed-forward for fast line
transient response
Dual synchronous buck controllers
Built-in gate drive boost circuit for driving external high-side
N-channel MOSFET
2 independently programmable output voltages:
Fixed 3.3 V or adjustable (800 mV to 6.0 V)
Fixed 5 V or adjustable (800 mV to 6.0 V)
Programmable PWM frequency
Integrated linear regulator controller
Extensive circuit protection functions
APPLICATIONS
Portable instruments
General-purpose dc-to-dc converters
High Efficiency Dual Output
Power Supply Controller
ADP3025
GENERAL DESCRIPTION
The ADP3025 is a highly efficient, dual synchronous buck
switching regulator controller optimized for converting a
battery or adapter input into the supply voltage required in
portable products and industrial systems. The oscillator
frequency can be programmed for 200 kHz or 300 kHz
operation, or can be synchronized to an external clock signal of
up to 350 kHz.
The ADP3025 provides accurate and reliable short-circuit
protection by using an internal current sense circuit that
reduces cost and increases overall efficiency. Other protection
features include programmable soft start, UVLO, and integrated
output undervoltage/overvoltage protection. The ADP3025
contains a linear regulator controller designed to drive an
external N-channel MOSFET. The linear regulator output is
adjustable and can be used to generate auxiliary supply voltages.
The ADP3025 is specified over the 0°C to 70°C commercial
temperature range and is available in a 38-lead TSSOP package.
VIN
5.5V TO 25V
5V
SIMPLIFIED FUNCTIONAL BLOCK DIAGRAM
Q3
L2
Q4
5V LINEAR
REGULATOR
800mV
REF
PFO
5V
SWITCHING
CONTROLLER
3.3V
SWITCHING
CONTROLLER
Q1
L1
Q2
3.3V
SS5
PWRGD
POWER-ON
RESET
LINEAR
CONTROLLER
ADP3025
SS3
Q5
2.5V
Figure 1.
Rev. A
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved.

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