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ADP2230 PDF预览

ADP2230

更新时间: 2024-11-24 01:21:59
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亚德诺 - ADI /
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18页 726K
描述
Dual 2 MHz, 800 mA, Synchronous, Low Quiescent Current Buck Regulator

ADP2230 数据手册

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Dual 2 MHz, 800 mA, Synchronous, Low  
Quiescent Current Buck Regulator  
Data Sheet  
ADP2230  
FEATURES  
TYPICAL APPLICATION CIRCUIT  
Input voltage range: 2.3 V to 6.5 V  
ADP2230  
L1  
Fixed and adjustable output voltage options  
Fixed output voltage pair options: 1.2 V/1.8 V, 1.2 V/3.3 V,  
1.8 V/3.3 V  
2.2µH  
V
2
9
VIN1  
IN  
V
1
OUT1  
SW1  
FB1  
C
IN  
VIN2  
10µF  
C
10µF  
3
OUT1  
Adjustable output voltage range: 0.8 V to 6 V  
Minimum guaranteed continuous output current: 800 mA  
Up to 94% efficiency  
Low quiescent current of 15 µA for both channels in power  
saving mode (PSM)  
Low shutdown current: 0.1 μA (typical)  
100% duty cycle for low dropout operation  
SYNC pin switching frequency options  
ON  
ON  
4
7
EN1  
EN2  
OFF  
L2  
2.2µH  
10  
8
V
SW2  
FB2  
OFF  
OUT2  
PWM  
C
10µF  
OUT2  
6
SYNC  
PSM/PWM  
PGND  
(EPAD)  
11  
AGND  
5
2 MHz fixed pulse-width modulation (PWM) mode  
2 MHz PSM/PWM automatic transitioning mode  
External clock synchronization from 1.5 MHz to 2.5 MHz  
Enable input with precision thresholds for each output  
180° phase shifted PWM outputs for minimum VIN ripple  
Current-limit and thermal shutdown (TSD) protection  
Quick output discharge (QOD)  
Figure 1. Fixed Output Voltage Typical Application Circuit  
10-lead, 3 mm × 3 mm × 0.75 mm LFCSP package  
APPLICATIONS  
During logic controlled shutdown, the input is disconnected  
from the output, and it draws less than 0.1 μA from the input  
source. The ADP2230 operates from input voltages from 2.3 V  
to 6.5 V, allowing the use of multiple alkaline, NiMH, or lithium  
cells and other standard power sources.  
Portable and battery-powered equipment  
Automatic meter readers (WSN)  
Point of sales and transaction processing instruments  
Mobile phones  
Digital cameras and audio devices  
Medical instruments  
The ADP2230 offers multiple options for setting the operating  
frequency. To maximize light load efficiency, the ADP2230 can  
operate at a reduced switching frequency in PSM and switch  
automatically to PWM as the load increases. The ADP2230 can  
be forced to operate at 2 MHz in PWM only mode when noise  
considerations are more important than efficiency. The  
ADP2230 can also be synchronized with a 1.5 MHz to 2.5 MHz  
external clock via the SYNC pin. When using the external clock  
synchronization control, both buck outputs operate in phase  
with the applied clock signal.  
Medium format display tablets and pads  
GENERAL DESCRIPTION  
The ADP2230 includes two high efficiency, low quiescent current,  
800 mA, step-down, dc-to-dc converters in a small, 10-lead,  
3 mm × 3 mm, LFCSP package. The total solution requires only  
five tiny external components. When the ADP2230 is used with  
three 0603 capacitors and two 2 mm × 2 mm inductors, the  
total solution size is about 48 mm2, resulting in the smallest  
footprint solution to meet a variety of portable applications.  
The ADP2230 includes an internal power switch, synchronous  
rectifier, and compensation to minimize external part count  
and maximize efficiency. Other key protection features include  
undervoltage lockout to prevent deep battery discharge, internal  
soft start to prevent input current overshoot at startup, and an  
integrated, switched resistor, QOD function that automatically  
discharges the output when the device is disabled. Short-circuit  
protection and thermal overload protection circuits prevent  
damage in adverse conditions.  
The ADP2230 buck regulator uses a proprietary, high speed,  
current mode, constant frequency, PWM control scheme for  
excellent stability and transient response. The buck outputs  
operate out of phase to reduce the input current ripple.  
To ensure the longest battery life in portable applications, the  
ADP2230 has a power saving variable frequency mode that  
reduces the switching frequency under light load conditions.  
Rev. A  
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  
rightsof third parties that may result fromits 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 andregisteredtrademarks 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  
Technical Support  
©2014 Analog Devices, Inc. All rights reserved.  
www.analog.com  
 
 
 
 

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