Ultralow Profile, 500 mA, 6 MHz, Synchronous,
Step-Down, DC-to-DC Converters
ADP2126/ADP2127
TYPICAL APPLICATION CIRCUITS
FEATURES
1.20 V and 1.26 V fixed output voltage options
Clock signal enable
Logic signal enable also available on certain models
6 MHz operating frequency
Spread spectrum frequency modulation to reduce EMI
500 mA continuous output current
Input voltage: 2.1 V to 5.5 V
L
ADP2126
1.0µH
INPUT
VOLTAGE
OUTPUT
A2
B1
C1
VOLTAGE
VIN
SW
2.1V TO 5.5V
1.20V OR 1.26V
C
2.2µF
IN
C
OUT
2.2µF
C2
GND
FB
EXTCLK MODE
B2
A1
PWM
0.3 μA (typical) shutdown supply current
Pin-selectable power-saving mode
Compatible with tiny multilayer inductors
Internal synchronous rectifier
AUTO
*
OFF ON
ON
OR
OFF
Internal compensation
Internal soft start
Output-to-ground short-circuit protection
Current-limit protection
Undervoltage lockout
Thermal shutdown protection
0.330 mm height (maximum), 6-ball BUMPED_CHIP (ADP2126)
0.200 mm height (maximum), 6-pad EWLP (ADP2127)
*LOGIC HIGH ENABLE IS ONLY AVAILABLE ON CERTAIN MODELS.
Figure 1. ADP2126 0.33 mm Maximum Height Solution
L
ADP2127
0.56µH
INPUT
VOLTAGE
OUTPUT
A2
B1
C1
VOLTAGE
VIN
SW
2.1V TO 5.5V
1.20V OR 1.26V
C
C
IN
2 × 1µF
OUT
2 × 1µF
C2
GND
FB
EXTCLK MODE
B2
A1
APPLICATIONS
Mobile phones
Digital still/video cameras
Digital audio
Portable equipment
Camera modules
Image stabilization systems
PWM
AUTO
*
OFF ON
ON
OR
OFF
*LOGIC HIGH ENABLE IS ONLY AVAILABLE ON CERTAIN MODELS.
Figure 2. ADP2127 0.22 mm Maximum Height Solution
GENERAL DESCRIPTION
The ADP2126/ADP2127 are high frequency, step-down, dc-to-
dc converters optimized for portable applications in which board
area and battery life are critical constraints. The fixed 6 MHz
operating frequency enables the use of tiny ceramic inductors
and capacitors and the regulators use spread spectrum frequency
modulation to reduce EMI. Additionally, synchronous rectification
improves efficiency and results in fewer external components.
The ADP2126/ADP2127 are enabled by a 6 MHz to 27 MHz
external clock signal applied to the EXTCLK pin. Certain models
can also be enabled with a logic high signal. When the external clock
is not switching and in a low logic state, the ADP2126/ADP2127
stop regulating and shut down to draw less than 0.3 μA (typical)
from the source.
The ADP2126/ADP2127 have an input voltage range of 2.1 V to
5.5 V, allowing the use of single Li+/Li polymer cell, three-cell
alkaline, NiMH cell, and other standard power sources. The
ADP2126/ADP2127 are internally compensated to minimize
external components and can source up to 500 mA. Other key
features, such as cycle-by-cycle peak current limit, soft start,
undervoltage lockout (UVLO), output-to-ground short-circuit
protection, and thermal shutdown provide protection for internal
and external circuit components.
At high load currents, the ADP2126/ADP2127 use a voltage
regulating pulse-width modulation (PWM) mode that maintains
a constant frequency with excellent stability and transient response.
Light load operation is determined by the state of the MODE pin.
In forced PWM mode, the converter continues operating in PWM
for light loads. Under light load conditions in auto mode, the
ADP2126/ADP2127 automatically enter a power-saving mode,
which uses pulse frequency modulation (PFM) to reduce the
effective switching frequency, thus ensuring the longest battery
life in portable applications.
Rev. A
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
©2011 Analog Devices, Inc. All rights reserved.
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