2 A/3 A, 20 V, 700 kHz,
Nonsynchronous Step-Down Regulators
ADP2302/ADP2303
TYPICAL APPLICATIONS CIRCUIT
FEATURES
V
IN
Wide input voltage range: 3.0 V to 20 V
Maximum load current
2 A for ADP2302
VIN
BST
ADP2302/
ADP2303
V
OUT
3 A for ADP2303
PGOOD
SW
1.ꢀ5 output accuracy over temperature
Output voltage down to 0.8 V
700 kHz switching frequency
Current-mode control architecture
Automatic PFM/PWM mode
Precision enable pin with hysteresis
Integrated high-side MOSFET
Integrated bootstrap diode
Internal compensation and soft start
Power-good output
ON
OFF
EN
FB
GND
Figure 1. Typical Application Circuit
100
90
80
70
60
50
40
Undervoltage lockout (UVLO)
Overcurrent protection (OCP)
Thermal shutdown (TSD)
8-lead SOIC package with exposed paddle
APPLICATIONS
Intermediate power rail conversion
DC-to-DC point of load applications
Communications and networking
Industrial and instrumentation
Healthcare and medical
V
V
= 3.3V
= 5.0V
OUT
OUT
INDUCTOR: VLF10040T
DIODE: SSB43L
-
4R7N5R4
0
0.5
1.0
1.5
2.0
2.5
3.0
Consumer
OUTPUT CURRENT (A)
Figure 2. ADP2303 Efficiency vs. Output Current at VIN = 12 V
GENERAL DESCRIPTION
The ADP2302/ADP2303 are fixed frequency, current-mode
control, step-down, dc-to-dc regulators with an integrated
power MOSFET. The ADP2302/ADP2303 can run from an
input voltage of 3.0 V to 20 V, which makes them suitable for a
wide range of applications. The output voltage of the ADP2302/
ADP2303 can be down to 0.8 V for the adjustable version, while
the fixed output version is available in preset output voltage
options of 5.0 V, 3.3 V, and 2.5 V. The 700 kHz operating
frequency allows small inductor and ceramic capacitors to be
used, providing a compact solution. Current mode control
provides fast and stable line and load transient performance.
The ADP2302/ADP2303 have integrated soft start circuitry to
prevent a large inrush current at power-up. The power-good
signal can be used to sequence devices that have an enable input.
The precision enable threshold voltage allows the part to be
easily sequenced from other input/output supplies. Other key
features include undervoltage lockout (UVLO), overvoltage
protection (OVP), thermal shutdown (TSD), and overcurrent
protection (OCP).
The ADP2302/ADP2303 devices are available in the 8-lead,
SOIC package with exposed paddle and are rated for the −40oC
to +125oC 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.
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
Fax: 781.461.3113
www.analog.com
©2010 Analog Devices, Inc. All rights reserved.
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