2 A/1.25 A, 1.2 MHz, Synchronous,
Step-Down DC-to-DC Regulators
ADP2119/ADP2120
FEATURES
Continuous output current
ADP2119: 2 A
TYPICAL APPLICATION CIRCUIT
C1
0.1µF
V
5V
IN
ADP2120: 1.25 A
C
R1
IN
145 mΩ and 70 mΩ integrated MOSFETs
Input voltage range from 2.3 V to 5.5 V
Output voltage from 0.6 V to VIN
1.5ꢀ output accuracy
1.2 MHz fixed switching frequency
Synchronizable between 1 MHz and 2 MHz
Selectable PWM or PFM mode operation
Current mode architecture
22µF
X5R
6.3V
10Ω
ADP2119/ADP2120
1
2
3
4
5
10
VIN
EN
9
PVIN SYNC/MODE
R2
10kΩ
V
OUT
3.3V
8
SW
PGOOD
TRK
C
L
OUT
1.5µH
22µF
X5R
6.3V
7
PGND
GND
R
TOP
10kΩ
6
FB
R
BOT
Precision threshold enable input
Power-good flag
2.21kΩ
Voltage tracking
Integrated soft start
Figure 1.
Internal compensation
Startup with precharged output
UVLO, OVP, OCP, and thermal shutdown
10-lead, 3 mm × 3 mm LFCSP_WD package
APPLICATIONS
Point of load conversion
Communications and networking equipment
Industrial and instrumentation
Consumer electronics
Medical applications
GENERAL DESCRIPTION
100
The ADP2119/ADP2120 are low quiescent current, synchronous,
step-down dc-to-dc regulators in a compact 3 mm × 3 mm
LFCSP_WD package. Both devices use a current mode, constant
frequency pulse-width modulation (PWM) control scheme for
excellent stability and transient response. Under light load conditions,
they can be configured to operate in a pulse frequency modulation
(PFM) mode, which reduces switching frequency to save power.
V
V
= 5V
IN
= 1.8V
OUT
90
80
70
60
50
40
30
20
10
0
PFM
The ADP2119/ADP2120 support input voltages from 2.3 V to
5.5 V. The output voltage can be adjusted from 0.6 V up to the
input voltage (VIN) for the adjustable version, whereas the fixed
output version is 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 ADP2119/ADP2120 require
minimal external parts and provide a high efficiency solution with
their integrated power switches, synchronous rectifiers, and internal
compensation. Each IC draws less than 2 μA current from the input
source when it is disabled. Other key features include undervoltage
lockout (UVLO), integrated soft start to limit inrush current at
startup, overvoltage protection (OVP), overcurrent protection
(OCP), and thermal shutdown (TSD).
FPWM
0.01
0.1
1
OUTPUT CURRENT (A)
Figure 2. ADP2119 Efficiency vs. Output Current
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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