Datasheet

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Compact, 800 mA, 3 MHz,

Step-Down DC-to-DC Converter

Data Sheet

ADP2138/ADP2139

Rev. C Document Feedback

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FEATURES

Input voltage: 2.3 V to 5.5 V

Peak efficiency: 95%

3 MHz fixed frequency operation

Typical quiescent current: 24 μA

Very small solution size

6-lead, 1 mm × 1.5 mm WLCSP package

Fast load and line transient response

100% duty cycle low dropout mode

Internal synchronous rectifier, compensation, and soft start

Current overload and thermal shutdown protections

Ultralow shutdown current: 0.2 μA (typical)

Forced PWM and automatic PWM/PSM modes

Supported by ADIsimPower™ design tool

APPLICATIONS

PDAs and palmtop computers

Wireless handsets

Digital audio, portable media players

Digital cameras, GPS navigation units

GENERAL DESCRIPTION

The ADP2138 and ADP2139 are high efficiency, low quiescent

current, synchronous step-down dc-to-dc converters. The

ADP2139 has the additional feature of an internal discharge

switch. The total solution requires only three tiny external

components. When the MODE pin is set high, the buck

regulator operates in forced PWM mode, which provides low

peak-to-peak ripple for power supply noise sensitive loads at

the expense of light load efficiency. When the MODE pin is set

low, the buck regulator automatically switches operating modes,

depending on the load current level. At higher output loads, the

buck regulator operates in PWM mode. When the load current

falls below a predefined threshold, the regulator operates in power

save mode (PSM), improving light load efficiency.

The ADP2138/ADP2139 operate on input voltages of 2.3 V to

5.5 V, which allows for single lithium or lithium polymer cell,

multiple alkaline or NiMH cell, PCMCIA, USB, and other

standard power sources. The maximum load current of 800 mA

is achievable across the input voltage range.

The ADP2138/ADP2139 are available in fixed output voltages of

3.3 V, 3.0 V, 2.8 V, 2.5 V, 1 . 8 V, 1 . 5 V, 1.2 V, 1.0 V, and 0.8 V. All

versions include an internal power switch and synchronous rect-

ifier for minimal external part count and high efficiency. The

ADP2138/ADP2139 have internal soft start and they are internally

compensated. During logic controlled shutdown, the input is

disconnected from the output and the ADP2138/ADP2139

draw 0.2 μA (typical) from the input source.

Other key features include undervoltage lockout to prevent deep

battery discharge, and soft start to prevent input current over-

shoot at startup. The ADP2138/ADP2139 are available in a 6-ball

wafer level chip scale package (WLCSP).

TYPICAL APPLICATIONS CIRCUIT

OFF

FORCE

PWM

AUTO

VIN SW

MODE

GND

VOUT

ADP2138/

ADP2139

4.7µF 4.7µF

2.3V TO 5.5V

OUT

1.0µH

09496-001

Figure 1.

Summary of content (20 pages)

PAGE 1
Compact, 800 mA, 3 MHz, Step-Down DC-to-DC Converter ADP2138/ADP2139 Data Sheet FEATURES GENERAL DESCRIPTION Input voltage: 2.3 V to 5.5 V Peak efficiency: 95% 3 MHz fixed frequency operation Typical quiescent current: 24 μA Very small solution size 6-lead, 1 mm × 1.5 mm WLCSP package Fast load and line transient response 100% duty cycle low dropout mode Internal synchronous rectifier, compensation, and soft start Current overload and thermal shutdown protections Ultralow shutdown current: 0.
PAGE 2
ADP2138/ADP2139 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Short-Circuit Protection............................................................ 12 Applications ....................................................................................... 1 Undervoltage Lockout ............................................................... 12 General Description ........................................................
PAGE 3
Data Sheet ADP2138/ADP2139 SPECIFICATIONS VIN = 3.6 V, VOUT = 0.8 V − 3.3 V, TJ = −40°C to +125°C for minimum/maximum specifications, and TA = 25°C for typical specifications, unless otherwise noted. All limits at temperature extremes are guaranteed via correlation using standard statistical quality control (SQC). Table 1.
PAGE 4
ADP2138/ADP2139 Data Sheet ABSOLUTE MAXIMUM RATINGS Table 3. Parameter VIN, EN, MODE VOUT, SW to GND Temperature Range Operating Ambient Operating Junction Storage Temperature Lead Temperature Range Soldering (10 sec) Vapor Phase (60 sec) Infrared (15 sec) ESD Model Human Body Charged Device Machine Rating −0.4 V to +6.5 V −1.0 V to (VIN + 0.
PAGE 5
Data Sheet ADP2138/ADP2139 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS VIN EN 1 4 SW MODE 2 5 GND VOUT 6 TOP VIEW (BALL SIDE DOWN) Not to Scale 09496-002 3 Figure 2. Pin Configuration (Top View) Table 5. Pin Function Descriptions Pin No. 1 Mnemonic VIN 2 SW 3 4 5 GND EN MODE 6 VOUT Description Power Source Input. VIN is the source of the PFET high-side switch. Bypass VIN to GND with a 4.7 μF or greater capacitor as close to the ADP2138/ADP2139 as possible. Switch Node Output.
PAGE 6
ADP2138/ADP2139 Data Sheet TYPICAL PERFORMANCE CHARACTERISTICS 100 100 90 90 80 80 70 70 EFFICIENCY (%) 60 50 40 0.01 0.1 10 1 IOUT (A) 0 0.001 100 90 90 80 80 70 70 EFFICIENCY (%) 1 60 50 40 30 60 50 40 30 VIN = 2.3V VIN = 3.6V VIN = 4.2V VIN = 5.5V 10 0.01 0.1 20 VIN = 3.9V VIN = 4.2V VIN = 5.5V 10 1 IOUT (A) 0 0.001 09496-004 20 0.01 0.1 1 IOUT (A) Figure 4. Efficiency vs. Load Current, Across Input Voltage, VOUT = 1.
PAGE 7
Data Sheet ADP2138/ADP2139 1.825 3.5 VIN = 2.3V VIN = 3.6V VIN = 4.2V VIN = 5.5V 3.3 3.2 FREQUENCY (MHz) VOUTA (V) 1.815 –40°C +25°C +85°C +125°C 3.4 1.805 1.795 3.1 3.0 2.9 2.8 2.7 1.785 2.6 0.1 0.2 0.3 0.4 IOUT (A) 0.5 0.6 0.7 0.8 2.5 0 Figure 9. Load Regulation Across Input Voltage, VOUT = 1.8 V, PWM Mode 0.2 0.3 0.4 IOUT (A) 0.5 0.7 3.5 VIN = 2.3V VIN = 3.6V VIN = 4.2V VIN = 5.5V 3.4 3.3 FREQUENCY (MHz) 0.805 0.800 0.795 0.790 3.2 3.1 3.0 2.9 2.8 VIN = 2.3V VIN = 3.
PAGE 8
ADP2138/ADP2139 Data Sheet 350 T –40°C +25°C +125°C 300 SW 4 250 RDSON (mΩ) VOUT 200 1 150 IOUT 100 2.8 3.3 3.8 4.3 INPUT VOLTAGE (V) 4.8 09496-036 0 2.3 5.3 CH1 100mV CH2 250mA Ω CH4 5.00V M 40.0µs A CH2 215mA T 26.00% Figure 15. RDSON PFET vs. Input Voltage, Across Temperature 09496-015 2 50 Figure 18. Response to Load Transient, 50 mA to 500 mA, VOUT = 1.8 V, Automatic Mode 250 T –40°C +25°C +125°C SW 200 VOUT 150 1 IOUT 100 50 2.8 3.3 3.8 4.
PAGE 9
Data Sheet ADP2138/ADP2139 T T SW VIN 4 VOUT 1 IOUT VOUT 1 2 CH2 250mA Ω CH4 5.00V M 40.0µs A CH2 275mA T 26.00% CH1 20.0mV CH3 1.00V M 40.0µs T Figure 21. Response to Load Transient, 150 mA to 500 mA, VOUT = 3.3 V, PWM Mode A CH3 4.50V –84.0000µs 09496-021 CH1 100mV 09496-018 3 Figure 24. Response to Line Transient, VOUT = 0.8 V, VIN = 4.0 V to 4.8 V, PWM Mode T T SW VIN 4 VOUT 1 IOUT VOUT 1 2 CH2 100mA Ω CH4 5.00V M 40.0µs A CH2 114mA T 26.00% CH1 20.0mV CH3 1.00V M 40.
PAGE 10
ADP2138/ADP2139 Data Sheet T T SW SW 4 IIN 4 VOUT 2 2 IL VOUT 1 EN 1 CH2 500mA Ω CH4 5.00V M 40.0µs A CH3 2.50V T 10.40% CH1 10.0mVΩ CH2 500mA Ω CH4 2.00V M 40.0µs A CH4 1.32V T 50.00% Figure 27. Startup, VOUT = 0.8 V, IOUT = 10 mA 09496-026 CH1 1.00V Ω CH3 5.00V 09496-023 31 Figure 30. Typical Waveform, VOUT = 1.8 V, PWM Mode, IOUT = 200 mA T T SW VOUT 1 4 IIN MODE 2 31 SW VOUT 1 EN CH2 500mA Ω CH4 5.00V M 40.0µs A CH3 2.50V T 10.40% 09496-024 CH1 5.00V Ω CH3 5.
PAGE 11
Data Sheet ADP2138/ADP2139 THEORY OF OPERATION PWM COMP GM ERROR AMP SOFT START VIN ILIMIT VOUT PSM COMP PWM/ PSM CONTROL LOW CURRENT OSCILLATOR UNDERVOLTAGE LOCK OUT DRIVER AND ANTISHOOT THROUGH ADP2138 THERMAL SHUTDOWN SW MODE 09496-027 EN GND Figure 33. ADP2138 Functional Block Diagram The ADP2138 and ADP2139 are step-down dc-to-dc converters that use a fixed frequency and high speed current-mode architecture.
PAGE 12
ADP2138/ADP2139 Data Sheet SHORT-CIRCUIT PROTECTION possible input voltage drops when a battery or a high impedance power source is connected to the input of the converter. The ADP2138/ADP2139 include frequency fold back to prevent output current runaway on a hard short. When the voltage at the feedback pin falls below half the target output voltage, indicating the possibility of a hard short at the output, the switching frequency is reduced to half the internal oscillator frequency.
PAGE 13
Data Sheet ADP2138/ADP2139 APPLICATIONS INFORMATION ADIsimPower DESIGN TOOL The ADP2138/ADP2139 is supported by ADIsimPower design tool set. ADIsimPower is a collection of tools that produce complete power designs optimized for a specific design goal. The tools enable the user to generate a full schematic, bill of materials, and calculate performance in minutes.
PAGE 14
ADP2138/ADP2139 Data Sheet THERMAL CONSIDERATIONS 6 Because of the high efficiency of the ADP2138/ADP2139, only a small amount of power is dissipated inside the ADP2138/ADP2139 package, which reduces thermal constraints.
PAGE 15
Data Sheet ADP2138/ADP2139 EVALUATION BOARD TB1 1 VIN VIN 3 CIN 4.7µF TB2 EN 4 VIN SW 2 1 L1 1µH VOUT U1 GND EN VOUT 6 EN 5 TB3 2 COUT 4.7µF MODE TB6 TB4 T5 GND IN GND OUT 09496-030 MODE Figure 36. Evaluation Board Schematic 09496-031 09496-032 EVALUATION BOARD LAYOUT Figure 38. Bottom Layer Figure 37. Top Layer Rev.
PAGE 16
ADP2138/ADP2139 Data Sheet OUTLINE DIMENSIONS 1.070 1.030 0.990 2 1 A BALL A1 IDENTIFIER 1.545 1.505 1.465 1.00 REF (BALL SIDE DOWN) 0.50 REF BOTTOM VIEW 0.370 0.355 0.340 SIDE VIEW (BALL SIDE UP) COPLANARITY 0.05 0.340 0.320 0.300 0.270 0.240 0.210 Figure 39. 6-Ball Wafer Level Chip Scale Package [WLCSP] (CB-6-12) Dimensions shown in millimeters Rev. C | Page 16 of 20 08-10-2012-A SEATING PLANE C 0.50 REF TOP VIEW 0.640 0.595 0.
PAGE 17
Data Sheet ADP2138/ADP2139 ORDERING GUIDE Model 1 ADP2138ACBZ-0.8-R7 ADP2138ACBZ-1.0-R7 ADP2138ACBZ-1.2-R7 ADP2138ACBZ-1.5-R7 ADP2138ACBZ-1.8-R7 ADP2138ACBZ-2.5-R7 ADP2138ACBZ-2.8-R7 ADP2138ACBZ-3.0-R7 ADP2138ACBZ-3.3-R7 ADP2139ACBZ-0.8-R7 ADP2139ACBZ-1.0-R7 ADP2139ACBZ-1.2-R7 ADP2139ACBZ-1.5-R7 ADP2139ACBZ-1.8-R7 ADP2139ACBZ-2.5-R7 ADP2139ACBZ-2.8-R7 ADP2139ACBZ-3.0-R7 ADP2139ACBZ-3.3-R7 ADP2138CB-0.8EVALZ ADP2138CB-1.0EVALZ ADP2138CB-1.2EVALZ ADP2138CB-1.5EVALZ ADP2138CB-1.8EVALZ ADP2138CB-2.
PAGE 18
ADP2138/ADP2139 Data Sheet NOTES Rev.
PAGE 19
Data Sheet ADP2138/ADP2139 NOTES Rev.