3 MHz, 600 mA, Low Quiescent Current
Buck with 300 mA LDO Regulator
Data Sheet
ADP2140
FEATURES
TYPICAL APPLICATION CIRCUITS
V
= 3.6V
Input voltage range: 2.3 V to 5.5 V
LDO input (VIN2) 1.65 V to 5.5 V
Buck output voltage range: 1.0 V to 3.3 V
LDO output voltage range: 0.8 V to 3.3 V
Buck output current: 600 mA
IN1
+
C
10µF
IN
ADP2140
100kΩ
PG
10
9
1
2
3
4
5
VIN1
PGND
1µH
V
= 1.2V
OUT
PG
SW
8
+
C
EN1
EN2
EN1
AGND
FB
OUT
10µF
LDO output current: 300 mA
7
EN2
V
= 1.8V
OUT2
6
LDO quiescent current: 22 μA with zero load
Buck quiescent current: 20 μA in PSM mode
Low shutdown current: <0.3 μA
Low LDO dropout 110 mV @ 300 mA load
High LDO PSRR
VOUT2
VIN2
+
C
OUT2
1µF
Figure 1. ADP2140 with LDO Connected to VIN1
V
= 3.3V
IN1
65 dB @ 10 kHz at VOUT2 = 1.2 V
+
C
IN
10µF
ADP2140
55 dB @ 100 kHz at VOUT2 = 1.2 V
Low noise LDO: 40 μV rms at VOUT2 = 1.2 V
Initial accuracy: 1ꢀ
Current-limit and thermal overload protection
Power-good indicator
100kΩ
PG
10
9
1
2
3
4
5
VIN1
PGND
1µH
V
= 1.8V
OUT
PG
SW
8
+
C
EN1
EN2
EN1
AGND
FB
OUT
10µF
7
EN2
V
= 1.2V
OUT2
6
VOUT2
VIN2
+
Optional enable sequencing
10-lead 0.75 mm × 3 mm × 3 mm LFCSP package
C
OUT2
1µF
Figure 2. ADP2140 with LDO Connected to Buck Output
APPLICATIONS
Mobile phones
Personal media players
Digital camera and audio devices
Portable and battery-powered equipment
GENERAL DESCRIPTION
The ADP2140 includes a high efficiency, low quiescent 600 mA
stepdown dc-to-dc converter and a 300 mA LDO packaged in a
small 10-lead 3 mm × 3 mm LFCSP. The total solution requires
only four tiny external components.
ADP2140 includes a power-good pin, soft start, and internal
compensation. Numerous power sequencing options are user-
selectable through two enable inputs. In autosequencing mode,
the highest voltage output enables on the rising edge of EN1.
During logic controlled shutdown, the input disconnects from
the output and draws less than 300 nA from the input source.
Other key features include: undervoltage lockout to prevent deep
battery discharge, soft start to prevent input current overshoot
at startup, and both short-circuit protection and thermal overload
protection circuits to prevent damage in adverse conditions.
The buck regulator uses a proprietary high speed current-
mode, constant frequency, pulse-width modulation (PWM)
control scheme for excellent stability and transient response. To
ensure the longest battery life in portable applications, the
ADP2140 has a power saving variable frequency mode to reduce
switching frequency under light loads.
When the ADP2140 is used with two 0603 capacitors, one 0402
capacitor, one 0402 resistor, and one 0805 chip inductor, the
total solution size is approximately 90 mm2 resulting in the smallest
footprint solution to meet a variety of portable applications.
The LDO is a low quiescent current, low dropout linear regulator
designed to operate in a split supply mode with VIN2 as low as
1.65 V. The low input voltage minimum allows the LDO to be
powered from the output of the buck regulator increasing effi-
ciency and reducing power dissipation. The ADP2140 runs from
input voltages of 2.3 V to 5.5 V allowing single Li+/Li− polymer
cell, multiple alkaline/NiMH cell, PCMCIA, and other standard
power sources.
Rev. B
Document Feedback
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 registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2010–2019 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
5秒后页面跳转
SG3525资料手册详解：SG3525参数分析、引脚说明、应用介绍
AT89C51单片机资料手册详细解析及应用示例
CP2102资料手册解读：CP2102引脚说明、关键参数分析
资料手册解读：UC3842参数和管脚说明
微信公众号
抖音公众号
浙公网安备 33010502006866号 浙ICP备10014259号-119
营业执照ICP证
数据手册
如果您发现信息不准确，
