ADP3025 データシートの表示（PDF） - Analog Devices
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ADP3025 Datasheet PDF : 24 Pages
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High Efficiency Dual Output
Power Supply Controller
ADP3025
FEATURES
GENERAL DESCRIPTION
Wide input voltage range: 5.5 V to 25 V
The ADP3025 is a highly efficient, dual synchronous buck
High conversion efficiency > 96%
switching regulator controller optimized for converting a
Integrated current sense—no external resistor required
battery or adapter input into the supply voltage required in
Low shutdown current: 19 µA (typical)
portable products and industrial systems. The oscillator
Voltage mode PWM with input feed-forward for fast line
frequency can be programmed for 200 kHz or 300 kHz
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)
E Fixed 5 V or adjustable (800 mV to 6.0 V)
Programmable PWM frequency
Integrated linear regulator controller
T Extensive circuit protection functions
APPLICATIONS
E Portable instruments
General-purpose dc-to-dc converters
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.
L VIN
5.5V TO 25V
BSO 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
O SS5
SS3
PWRGD
POWER-ON
RESET
LINEAR
CONTROLLER
ADP3025
Q5
2.5V
Figure 1.
Rev. A
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Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved.
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