ADP2121-1.875EVALZ Analog Devices, ADP2121-1.875EVALZ Datasheet

ADP2121-1.875EVALZ

Manufacturer Part Number

ADP2121-1.875EVALZ

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 ADP2121-1.875EVALZ

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

Related parts for ADP2121-1.875EVALZ

ADP2121-1.875EVALZ Summary of contents

Page 1

... Figure 2. Efficiency vs. Load Current for Each Voltage Option The ADP2121 has an input voltage range of 2 5 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 ...

Page 2

... ADP2121 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 General Description ......................................................................... 1 Typical Application Circuit ............................................................. 1 Typical Performance......................................................................... 1 Revision History ............................................................................... 2 Specifications ..................................................................................... 3 Absolute Maximum Ratings ............................................................ 4 Thermal Data ................................................................................ 4 Thermal Resistance ...................................................................... 4 ESD Caution .................................................................................. 4 Pin Configuration and Function Descriptions ............................. 5 Typical Performance Characteristics ............................................. 6 REVISION HISTORY 1/11—Rev Rev. B Changes to Table 2 Summary .......................................................... 3 Changes to Undervoltage Lockout Threshold Parameter and Output Voltage Accuracy Parameter in Table 2 ........................... 3 6/10— ...

Page 3

... OUT −3 OUT −0.2 = 1. 1.875 V 4.1 FB 6.4 220 260 790 1000 828 1000 5.36 6 1.3 0.01 275 75 100 1.24 150 15 = 25°C. A ADP2121 Max Unit 5 µ µA 1.5 µ %/A 8 µA 8 µA 8 µA 440 mΩ ...

Page 4

... THERMAL DATA Absolute maximum ratings apply individually only, not in combination. The ADP2121 can be damaged when the junction temperature limits are exceeded. Monitoring ambient tempera- ture does not guarantee that the junction temperature (T within the specified temperature limits. In applications with high power dissipation and poor PCB thermal resistance, the maximum ambient temperature may need to be derated ...

Page 5

... SW Switch Node Feedback Divider Input. Connect the output capacitor from FB to GND as close as possible to the ADP2121 to set the output voltage ripple and to complete the control loop. A2 VIN Power Supply Input. Connect the input capacitor from VIN to GND as close as possible to the ADP2121. ...

Page 6

... ADP2121 TYPICAL PERFORMANCE CHARACTERISTICS 0.47 µH (1800 mA, 1008, LQM2HPNR47MG0L OUT C = 4.7 µF (6.3 V, 0402, X5R, GRM155R60J475ME87D OUT 100 90 AUTO MODE LOAD CURRENT (mA) Figure 4. Efficiency vs. Load Current 100 90 AUTO MODE ...

Page 7

... INPUT VOLTAGE ( 2.3 2.7 3.1 3.5 3.9 4.3 4.7 INPUT VOLTAGE (V) Figure 15. PWM Mode Quiescent Current vs. Input Voltage for All Voltage Options (Switching, No Load) ADP2121 = 1.8V OUT = 1.82V OUT = 1.85V OUT = 1.875V OUT = 2.3V OUT 5.1 5.5 = 1.8V OUT = 1.82V OUT = 1.85V OUT = 1.875V OUT = 2.3V OUT 5.1 5.5 = 1.8V OUT = 1 ...

Page 8

... ADP2121 –40° +25° +85° 0 LOAD CURRENT (mA) Figure 16. Efficiency vs. Load Current Over Temperature 1. 2.7V IN 1.86 1.85 1.84 1.83 AUTO MODE 1.82 0 LOAD CURRENT (mA) Figure 17. Output Voltage Accuracy (Auto Mode) 360 340 320 300 280 T A 260 ...

Page 9

... Figure 25. Load Transient Response 150 2.5 V, Auto Mode) IN OUTPUT VOLTAGE (50mV/DIV) LOAD CURRENT (100mA/DIV) TIME (20µs/DIV) Figure 26. Load Transient Response 150 3.6 V, Auto Mode) IN OUTPUT VOLTAGE (50mV/DIV) LOAD CURRENT (100mA/DIV) TIME (20µs/DIV) Figure 27. Load Transient Response 150 4.5 V, Auto Mode) IN ADP2121 ...

Page 10

... ADP2121 OUTPUT VOLTAGE (50mV/DIV) LOAD CURRENT (100mA/DIV) TIME (20µs/DIV) Figure 28. Load Transient Response 150 2.5 V, PWM Mode) IN OUTPUT VOLTAGE (50mV/DIV) LOAD CURRENT (100mA/DIV) TIME (20µs/DIV) Figure 29. Load Transient Response 150 3.6 V, PWM Mode) IN OUTPUT VOLTAGE (50mV/DIV) LOAD CURRENT (100mA/DIV) TIME (20µ ...

Page 11

... OUTPUT VOLTAGE (50mV/DIV, 1.82V DC OFFSET) LOAD CURRENT (100mA/DIV) TIME (20µs/DIV) Figure 38. Load Transient Response,150 mA to 400 3.6 V, PWM Mode) IN OUTPUT VOLTAGE (50mV/DIV, 1.82V DC OFFSET) LOAD CURRENT (100mA/DIV) TIME (20µs/DIV) Figure 39. Load Transient Response, 150 mA to 400 4.5 V, PWM Mode) IN Rev Page ADP2121 ...

Page 12

... ADP2121 1.8V OUT NO LOAD OUTPUT VOLTAGE INDUCTOR CURRENT (200mA/DIV) EN PIN VOLTAGE (5V/DIV) TIME (10µs/DIV) Figure 40. Start-Up Waveform, No Load OUTPUT VOLTAGE (500mV/DIV) INDUCTOR CURRENT (200mA/DIV) ENABLE PIN VOLTAGE (5V/DIV) TIME (40µs/DIV) Figure 41. Start-Up Waveform, No Load 2.3V OUT OUTPUT VOLTAGE NOLOAD ...

Page 13

... 2.3V OUT OUTPUT VOLTAGE (200mV/DIV) INDUCTOR CURRENT (500mA/DIV) TIME (200μs/DIV) Figure 48. Output Short-Circuit Response OUTPUT VOLTAGE (20mV/DIV, 1.82V DC OFFSET) OUTPUT VOLTAGE (20mV/DIV, 1.82V DC OFFSET) = 1.82V Rev Page ADP2121 SWITCH NODE VOLTAGE (2V/DIV) INDUCTOR CURRENT V = 3.6V IN (200mA/DIV 1.82V OUT I ...

Page 14

... MODE low to allow the converter to automatically enter the power-saving PFM mode at light load currents. Do not leave this pin floating. The MODE pin is not designed for dynamic control and should not be changed after the ADP2121 is enabled. Pulse-Width Modulation (PWM) Mode The PWM mode forces the part to maintain a fixed frequency of 6 MHz (typical) over all load conditions ...

Page 15

... OUT ENABLE/SHUTDOWN The EN input turns the ADP2121 on or off. Connect EN to GND or logic low to shut down the part and reduce the current consumption to 1.0 µA (maximum). Connect EN to VIN or to logic high to enable the part. Do not leave this pin floating. ...

Page 16

... If the output voltage is inadvertently shorted to GND, a standard dc-to-dc controller delivers maximum power into that short. This may result in a potentially catastrophic failure. To prevent this, the ADP2121 senses when the output voltage is below the short-circuit protection threshold (typically 1.24 V). At this point, the controller turns off for approximately 1 ...

Page 17

... For a given loop crossover frequency (the frequency at which the loop gain drops to 0 dB), the maximum voltage transient excursion (overshoot) is inversely proportional to the value of the output capacitor. The ADP2121 (1) has been designed to operate with small ceramic capacitors in the 4.7 µ ...

Page 18

... ADP2121 Table 6. Recommended Inductor Selection Manufacturer Series Murata LQM2HPNR47MG0L LQM21PNR47MC0D Taiyo Yuden BRC1608TR45M TDK MLZ2012DR47MT GLFR1608TR47M-LR Table 7. Recommended Input Capacitor Selection Manufacturer Part Number Murata GRM155R60J225M Taiyo Yuden JMK105BJ225MV-F Table 8. Recommended Output Capacitor Selection Manufacturer Part Number Murata GRM188R60J475KE19D GRM155R60J475ME87D Taiyo Yuden AMK105BJ475MV-F Inductance (µ ...

Page 19

... SW or near the inductor to prevent radiated EN CIN noise injection. • Keep the low ESR output capacitor, COUT, close to FB and GND of the ADP2121. Long trace lengths from the part to the output capacitor add series inductance and may cause GND instability or increased ripple. Rev Page MODE ...

Page 20

... ADP2121ACBZ-1875R7 −40 °C to +85 °C ADP2121ACBZ-2.3-R7 −40 °C to +85 °C ADP2121-1.8-EVALZ ADP2121-1.82-EVALZ ADP2121-1.85-EVALZ ADP2121-1.875EVALZ ADP2121-2.3-EVALZ RoHS Compliant Part. 2 Halide free. ©2009–2011 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. ...

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