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Analog Devices Semiconductor Electronic Components Datasheet

ADP2300 Datasheet

(ADP2300 / ADP2301) Nonsynchronous Step-Down Regulator

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ADP2300 pdf
1.2 A, 20 V, 700 kHz/1.4 MHz,
Nonsynchronous Step-Down Regulator
ADP2300/ADP2301
FEATURES
1.2 A maximum load current
±2% output accuracy over temperature range
Wide input voltage range: 3.0 V to 20 V
700 kHz (ADP2300) or 1.4 MHz (ADP2301)
switching frequency options
High efficiency up to 91%
Current-mode control architecture
Output voltage from 0.8 V to 0.85 × VIN
Automatic PFM/PWM mode switching
Precision enable pin with hysteresis
Integrated high-side MOSFET
Integrated bootstrap diode
Internal compensation and soft start
Minimum external components
Undervoltage lockout (UVLO)
Overcurrent protection (OCP) and thermal shutdown (TSD)
ADIsimPower™ online design tool
Available in ultrasmall, 6-lead TSOT package
APPLICATIONS
LDO replacement for digital load applications
Intermediate power rail conversion
Communications and networking
Industrial and instrumentation
Healthcare and medical
Consumer
GENERAL DESCRIPTION
The ADP2300/ADP2301 are compact, constant-frequency,
current-mode, step-down dc-to-dc regulators with integrated
power MOSFET. The ADP2300/ADP2301 devices run from
input voltages of 3.0 V to 20 V, making them suitable for a wide
range of applications. A precise, low voltage internal reference
makes these devices ideal for generating a regulated output
voltage as low as 0.8 V, with ±2% accuracy, for up to 1.2 A load
current.
There are two frequency options: the ADP2300 runs at 700 kHz,
and the ADP2301 runs at 1.4 MHz. These options allow users to
make decisions based on the trade-off between efficiency and
TYPICAL APPLICATIONS CIRCUIT
3.0V TO 20V
VIN
BST
ADP2300/ SW
ADP2301
VOUT
ON
OFF
EN
GND
FB
100
95
90
85
80
75
70
65
60
0
Figure 1.
fSW = 1.4MHz
fSW = 700kHz
VVIONU=T
12V
= 5.0V
0.2 0.4 0.6 0.8 1.0 1.2
IOUT (A)
Figure 2. Efficiency vs. Output Current
total solution size. Current-mode control provides fast and stable
line and load transient performance. The ADP2300/ADP2301
devices include internal soft start to prevent inrush current at
power-up. Other key safety features include short-circuit protec-
tion, thermal shutdown (TSD), and input undervoltage lockout
(UVLO). The precision enable pin threshold voltage allows the
ADP2300/ADP2301 to be easily sequenced from other input/
output supplies. It can also be used as a programmable UVLO
input by using a resistive divider.
The ADP2300/ADP2301 are available in a 6-lead TSOT package
and are rated for the −40°C to +125°C junction temperature range.
Rev. 0
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2010 Analog Devices, Inc. All rights reserved.
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Analog Devices Semiconductor Electronic Components Datasheet

ADP2300 Datasheet

(ADP2300 / ADP2301) Nonsynchronous Step-Down Regulator

No Preview Available !

ADP2300 pdf
ADP2300/ADP2301
TABLE OF CONTENTS
Features .............................................................................................. 1 
Applications....................................................................................... 1 
Typical Applications Circuit............................................................ 1 
General Description ......................................................................... 1 
Revision History ............................................................................... 2 
Specifications..................................................................................... 3 
Absolute Maximum Ratings............................................................ 4 
Thermal Resistance ...................................................................... 4 
ESD Caution.................................................................................. 4 
Pin Configuration and Function Descriptions............................. 5 
Typical Performance Characteristics ............................................. 6 
Functional Block Diagram ............................................................ 13 
Theory of Operation ...................................................................... 14 
Basic Operation .......................................................................... 14 
PWM Mode................................................................................. 14 
Power Saving Mode.................................................................... 14 
Bootstrap Circuitry .................................................................... 14 
Precision Enable ......................................................................... 14 
Integrated Soft Start ................................................................... 14 
Current Limit .............................................................................. 14 
Short-Circuit Protection............................................................ 15 
Undervoltage Lockout (UVLO) ............................................... 15 
REVISION HISTORY
2/10—Revision 0: Initial Version
Thermal Shutdown .................................................................... 15 
Control Loop............................................................................... 15 
Applications Information .............................................................. 16 
Programming the Output Voltage ........................................... 16 
Voltage Conversion Limitations............................................... 16 
Low Input Voltage Considerations .......................................... 17 
Programming the Precision Enable ......................................... 17 
Inductor ....................................................................................... 18 
Catch Diode ................................................................................ 19 
Input Capacitor........................................................................... 19 
Output Capacitor........................................................................ 19 
Thermal Considerations............................................................ 20 
Design Example .............................................................................. 21 
Switching Frequency Selection................................................. 21 
Catch Diode Selection ............................................................... 21 
Inductor Selection ...................................................................... 21 
Output Capacitor Selection....................................................... 21 
Resistive Voltage Divider Selection.......................................... 22 
Circuit Board Layout Recommendations ................................... 23 
Typical Application Circuits ......................................................... 24 
Outline Dimensions ....................................................................... 26 
Ordering Guide .......................................................................... 26 
Rev. 0 | Page 2 of 28
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Part Number ADP2300
Description (ADP2300 / ADP2301) Nonsynchronous Step-Down Regulator
Maker Analog Devices
Total Page 28 Pages
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