3 A, 1.2 MHz/600 kHz High Efficiency
Synchronous Step-Down DC-to-DC Converter
ADP2118
FEATURES
GENERAL DESCRIPTION
3 A continuous output current
75 mΩ and 40 mΩ integrated FET
1.5ꢀ output accuracy
Input voltage range from 2.3 V to 5.5 V
Output voltage from 0.6 V to VIN
600 kHz or 1.2 MHz fixed switching frequency
Synchronizable between 600 kHz and 1.4 MHz
Selectable synchronize phase shift: 0o or 180o
Selectable PWM or PFM mode operation
Current mode architecture
Precision enable input
Power good output
Voltage tracking input
Integrated soft start
Internal compensation
Starts up into a precharged output
UVLO, OVP, OCP, and thermal shutdown
The ADP2118 is a low quiescent current, synchronous, step-down,
dc-to-dc converter in a compact 4mm × 4mm LFCSP_WQ
package. It uses a current mode, constant frequency pulse-width
modulation (PWM) control scheme for excellent stability and
transient response. Under light loads, the ADP2118 can be
configured to operate in pulse frequency modulation (PFM)
mode that reduces switching frequency to save power.
The ADP2118 runs from input voltages of 2.3 V to 5.5 V. The
output voltage of the ADP2118ACPZ-R7 is adjustable from
0.6 V to input voltage (VIN), and the ADP2118ACPZ-x.x-R7 are
available in preset output voltage options of 3.3 V, 2.5 V, 1.8 V,
1.5 V, 1.2 V, and 1.0 V. The ADP2118 requires minimal external
parts and provides a high efficiency solution with its integrated
power switch, synchronous rectifier, and internal compensation.
The IC draws less than 3 μA from the input source when it is
disabled. Other key features include undervoltage lockout
(UVLO), integrated soft start to limit inrush current at startup,
Available in 16-lead 4mm × 4mm LFCSP_WQ package
overvoltage protection (OVP), overcurrent protection (OCP),
and thermal shutdown (TSD).
APPLICATIONS
DSP/FPGA/ASIC core power
Telecommunication/networking equipment
PDAs and palmtop computers
Audio/video consumer electronics
C1
0.1µF
R1
10Ω
V
IN
5V
R2
100
C
IN
10kΩ
100µF
X5R,
6.3V
90
80
70
60
50
40
30
20
10
0
PFM OPERATION
16
15
14
13
L
1µH
1
2
3
4
12
11
10
9
SYNC/MODE
FREQ
PVIN
SW
V
3.3V
3A
OUT
C
OUT
ADP2118
100µF
X5R,
6.3V
TRK
FB
SW
FPWM OPERATION
SW
5
6
7
8
V
V
= 5V
fSO=UT1.2MHz
IN
= 3.3V
R
R
BOT
TOP
2.21kΩ 10kΩ
0.01
0.1
1
10
OUTPUT CURRENT (A)
Figure 2. Efficiency vs. Output Current
Figure 1. Typical Applications Circuit
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
©2009 Analog Devices, Inc. All rights reserved.
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