ADP2121-2.3-EVALZ Analog Devices, ADP2121-2.3-EVALZ Datasheet

ADP2121-2.3-EVALZ

Manufacturer Part Number

ADP2121-2.3-EVALZ

Description

Power Management IC Development Tools 6MHz Volt Mode Buck 500mA Bumped Die

Manufacturer

Analog Devices

Type

DC/DC Converters, Regulators & Controllersr

Series

ADP2121r

Datasheet

1.ADP2121-2.3-EVALZ.pdf (20 pages)

Specifications of ADP2121-2.3-EVALZ

Rohs

yes

Tool Is For Evaluation Of

ADP2121

Input Voltage

2.3 V to 5.5 V

Output Current

500 mA

Factory Pack Quantity

Current page: 1 of 20
Download datasheet (2Mb)

FEATURES

Peak efficiency: 92%

Operating frequency: 6 MHz

Typical quiescent current in auto mode: 36 µA

Fixed output voltage: 1.8 V, 1.82 V, 1.85 V, 1.875 V, 2.3 V

Maximum guaranteed load current: 600 mA at V

Input voltage: 2.3 V to 5.5 V

Typical shutdown supply current: 0.3 µA

Automatic power-saving mode

Compatible with tiny multilayer inductors

Internal synchronous rectifier

Internal compensation

Internal soft start

Output to ground short-circuit protection

Cycle-by-cycle current-limit protection

Enable/shutdown logic input

Undervoltage lockout

Thermal shutdown protection

Ultrasmall 6-ball, 0.4 mm pitch, 1.17 mm

APPLICATIONS

Mobile phones

Digital cameras

Digital audio

Portable equipment

GENERAL DESCRIPTION

The ADP2121 is a high frequency, low quiescent current

step-down dc-to-dc converter optimized for portable applications

in which board area and battery life are critical constraints. The

6 MHz operating frequency enables the use of tiny ceramic induc-

tors and capacitors. Additionally, the synchronous rectification

improves efficiency and results in fewer external components.

At high load currents, the device uses a voltage regulating pulse-

width modulation (PWM) mode that maintains a constant

frequency with excellent stability and transient response. In forced

PWM mode, the converter continues operating in PWM for light

loads. At light load conditions in auto mode, the ADP2121 can

automatically enter a power-saving mode that uses pulse-frequency

modulation (PFM) to reduce the effective switching frequency and

ensure the longest battery life in portable applications. During logic

controlled shutdown (EN ≤ 0.4 V), the input is disconnected

from the output and draws less than 0.3 μA current (typical)

from the source.

Rev. B

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 registered trademarks are the property of their respective owners.

WLCSP

= 2.7 V to 5.5 V

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.461.3113

Step-Down DC-to-DC Converter

The ADP2121 has an input voltage range of 2.3 V to 5.5 V (2.9 V

to 5.5 V for V

polymer cell, 3-cell alkaline or Ni-MH cell, and other standard

power sources. The converter can source up to 600 mA and is

internally compensated to minimize external components. 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, protect the internal and

external circuit components.

Table 1. Output Voltage Options

Input Voltage

Range (V)

2.3 to 5.5

2.9 to 5.5

INPUT VOLTAGE*

*FOR OUTPUT VOLTAGE = 2.3 V, INPUT VOLTAGE = 2.9 V TO 5.5V.

2.3V TO 5.5V

600 mA, 6 MHz, Synchronous

Figure 2. Efficiency vs. Load Current for Each Voltage Option

0.1

2.2µF

AUTO MODE

TYPICAL APPLICATION CIRCUIT

= 2.7 V

= 2.9V FOR V

OUT

TYPICAL PERFORMANCE

= 2.3 V), allowing the use of a single Li+/Li−

VIN

GND

ADP2121

Typical Start-Up

Time (μs)

275

100

OUT

LOAD CURRENT (mA)

MODE

= 2.3V)

Figure 1.

0.47µH

1.8V, 1.82V, 1.85V, 1.875V, 2.3V

100

OUTPUT VOLTAGE

4.7µF

Fixed Output

Voltage (V)

1.8, 1.85, 1.875

1.82

2.3

ADP2121

OUT

www.analog.com

= 1.8V

= 1.82V

= 1.85V

= 1.875V

= 2.3V

1000

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