ANALOG DEVICES ADP2107 Data Sheet
Summary
The ADP series are high-efficiency, ultra-low quiescent current synchronous step-down DC-to-DC converters designed for advanced portable electronics and networking equipment. These ICs maintain peak performance while minimizing power consumption across varying loads. This manual provides comprehensive technical guidance for engineers, detailing component selection (inductors, capacitors), setting the optimal output voltage, key specifications, and integration schematics. Ideal for developing robust power solutions for mobile handsets, PDAs, set-top boxes, and consumer electronics requiring reliable, high-efficiency power management from 2.7V to 5.5V inputs.
Page 1 Text Content
1 Amp/1.5 Amp/2 Amp Synchronous, Step-Down DC-to-DC Converters
ADP2105/ADP2106/ADP2107 FEATURES GENERAL DESCRIPTION Extremely high 97% efficiency The ADP2105/ADP2106/ADP2107 are low quiescent current, Ultralow quiescent current: 20 μA synchronous, step-down dc-to-dc converters in a compact 4 mm × 1.2 MHz switching frequency 4 mm LFCSP_VQ package. At medium to high load currents, 0.1 μA shutdown supply current these devices use a current mode, constant frequency pulse- Maximum load current width modulation (PWM) control scheme for excellent stability ADP2105: 1 A and transient response. To ensure the longest battery life in portable ADP2106: 1.5 A applications, the ADP2105/ADP2106/ADP2107 use a pulse ADP2107: 2 A frequency modulation (PFM) control scheme under light load Input voltage: 2.7 V to 5.5 V conditions that reduces switching frequency to save power. Output voltage: 0.8 V to VIN
The ADP2105/ADP2106/ADP2107 run from input voltages of
Maximum duty cycle: 100%
2.7 V to 5.5 V, allowing single Li+/Li− polymer cell, multiple
Smoothly transitions into low dropout (LDO) mode 9-
alkaline/Ni MH cells, PCMCIA, and other standard power sources.
Internal synchronous rectifier
The output voltage of ADP2105/ADP2106/ADP2107 is adjustable
Small 16-lead 4 mm × 4 mm LFCSP_VQ package
from 0.8 V to the input voltage (indicated by ADJ), whereas the
Optimized for small ceramic output capacitors
ADP2105/ADP2106/ADP2107 are available in preset output
Enable/shutdown logic input
voltage options of 3.3 V, 1.8 V, 1.5 V, and 1.2 V (indicated by x.x V).
Undervoltage lockout
EF FI IE
Each of these variations is available in three maximum current
Soft start
levels: 1 A (ADP2105), 1.5 A (ADP2106), and 2 A (ADP2107). The
APPLICATIONS power switch and synchronous rectifier are integrated for minimal
external part count and high efficiency. During logic controlled
Mobile handsets
www.BDTIC.c shutdown, the input is disconnected from the output, and it m/ADI
PDAs and palmtop computers
draws less than 0.1 μA from the input source. Other key features
Telecommunication/networking equipment
include undervoltage lockout to prevent deep battery discharge
Set top boxes
and programmable soft start to limit inrush current at startup.
Audio/video consumer electronics
TYPICAL OPERATING CIRCUIT
VOUT = 2.5V
VIN = 3.6V
VIN = 3.3V
10Ω0.1μF VIN INPUT VOLTAGE = 2.7V TO 5.5V
ON FB GND IN PWIN1
OUTPUT VOLTAGE = 2.5V
OFF EN LX2 VIN = 5V
GND PGND
ADP2107-ADJ 10μF 4.7μF
GND LX1
FB VIN 40kΩ
GND PWIN2
COMP SS AGND NC 0A TO 2A
1n F LOAD CURRENT (m A)
120p F Figure 2. Efficiency vs. Load Current for the ADP2107 with VOUT = 2.5 V
NC = NO CONNECT
Figure 1. Circuit Configuration of ADP2107 with VOUT = 2.5 V
Rev. C 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
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
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. Tel: 781.329.4700 www.analog.com Trademarks and registered trademarks are the property of their respective owners. Fax: 781.461.3113 ©2006–2008 Analog Devices, Inc. All rights reserved.
Page Summary Contents For ANALOG DEVICES ADP2107 Data Sheet
Manual Details
| Brand | Analog Devices |
|---|---|
| Pages | 36 |
| File Size | 1019.04 KB |
| Published | July 22, 2026 |
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Frequently Asked Questions
What input voltage range do these converters support?
They operate from an input voltage of 2.7 V to 5.5 V.
How can I set my required output voltage?
The output voltage is adjustable from 0.8 V up to the input voltage using the ADJ pin.
What protections are included for battery power?
They feature undervoltage lockout to prevent deep battery discharge, which is crucial for battery life.
Are these converters optimized for low-power applications?
Yes, they boast an ultralow quiescent current of 20 μA and use PFM mode under light loads to save power.