ADP2139CB-1.5EVALZ

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Compact, 800 mA, 3 MHz, Step-Down DC-to-DC Converter Data Sheet ADP2138/ADP2139 Rev. C Document Feedback 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. Tel: 781.329.4700 ©2011–2013 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com

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 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 ON OFF FORCE PWM AUTO VIN SW EN MODE GND VOUT ADP2138/ ADP2139 4.7µF 4.7µF 2.3V TO 5.5V VOUT1.0µH 09496-001 Figure 1.

ADP2138/ADP2139 Data Sheet Rev. C | Page 2 of 20 TABLE OF CONTENTS Input and Output Capacitor, Recommended Specifications .. 3

REVISION HISTORY

1/13—Rev. B to Rev. C 6/12—Rev. A to Rev. B 4/11—Rev. 0 to Rev. A 1/11—Revision 0: Initial Version

Data Sheet ADP2138/ADP2139 Rev. C | Page 3 of 20 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. Parameter Test Conditions/Comments Min Typ Max Unit INPUT CHARACTERISTICS Input Voltage Range 2.3 5.5 V Undervoltage Lockout Threshold VIN rising 2.3 V VIN falling 2.00 2.15 2.25 V OUTPUT CHARACTERISTICS Output Voltage Accuracy PWM mode −2 +2 % Line Regulation VIN = 2.3 V to 5.5 V, PWM mode 0.25 %/V Load Regulation ILOAD = 0 mA − 800 mA −0.95 %/A PWM TO POWER SAVE MODE CURRENT THRESHOLD 100 mA INPUT CURRENT CHARACTERISTICS DC Operating Current ILOAD = 0 mA, device not switching 23 30 μA Shutdown Current EN = 0 V, TA = TJ = −40°C to +85°C 0.2 1.0 μA SW CHARACTERISTICS SW On Resistance PFET 155 240 mΩ NFET 115 200 mΩ Current Limit PFET switch peak current limit 1100 1500 1650 mA Discharge Switch (ADP2139) 100 Ω ENABLE AND MODE CHARACTERISTICS Input High Threshold 1.2 V Input Low Threshold 0.4 V Input Leakage Current EN/MODE = 0 V (min), 3.6 V (max ) −1 0 +1 μA OSCILLATOR FREQUENCY 2.6 3.0 3.4 MHz START-UP TIME 250 μs THERMAL CHARACTERISTICS Thermal Shutdown Threshold 150 °C Thermal Shutdown Hysteresis 20 °C INPUT AND OUTPUT CAPACITOR, RECOMMENDED SPECIFICATIONS TA = −40°C to +125°C, unless otherwise specified. All limits at temperature extremes are guaranteed via correlation using standard statistical quality control (SQC). Table 2. Parameter Symbol Min Typ Max Unit MINIMUM INPUT AND OUTPUT CAPACITANCE CMIN 4.7 µF CAPACITOR ESR RESR 0.001 1 Ω

Note, MicroCSPTM Wafer Level Chip Scale Package. device soldered in a circuit board for surface-mount packages. Table 4. Thermal Resistance

Figure 2. Pin Configuration (Top View) Table 5. Pin Function Descriptions capacitor as close to the ADP2138/ADP2139 as possible. 2 SW Switch Node Output. SW is the drain of the P-channel MOSFET switch and N-channel synchronous rectifier. Connect the output LC filter between SW and the output voltage. 3 GND Ground. Connect the input and output capacitors to GND. 4 EN Buck Activation. To turn on the buck, set EN to high. To turn off the buck, set EN to low. pin low to allow automatic PWM/PSM operating mode. 6 VOUT Output Voltage Sensing Input.

Figure 33. ADP2138 Functional Block Diagram package allow for a small step-down dc-to-dc converter solution. to 5.5 V, and regulate an output voltage down to 0.8 V. high) or power save mode (when the mode pin is set low). across the inductor, causing the inductor current to decrease. The synchronous rectifier stays on for the rest of the cycle. the peak inductor current threshold. shutdown current to 0.2 μA (typical).

frequency is reduced to half the internal oscillator frequency. the inductor to discharge, preventing a runaway of output current. operation until the on-chip temperature drops below 130°C. When coming out of thermal shutdown, soft start is initiated. power source is connected to the input of the converter. when the output is in regulation after the EN pin is driven high. Start-up time consists of the power-up time and the soft start time. 100% of the time, VOUT drops below the desired output voltage. without allowing overshoot on VOUT. shutdown. The time to discharge is typically 200 μs. Figure 34. ADP2139 Functional Block Diagram

complete power designs optimized for a specific design goal. inductors are shown in Table 6. fSW is the switching frequency. through the inductor, which has an associated internal DCR. low core losses and low electromagnetic interference (EMI). Table 6. Suggested 1.0 μH Inductors each with different behavior over temperature and applied voltage. rating of 6.3 V or 10 V are recommended for best performance. CEFF is the effective capacitance at the operating voltage. TEMPCO is the worst-case capacitor temperature coefficient. TOL is the worst-case component tolerance. over −40°C to +85°C is assumed to be 15% for an X5R dielectric. COUT is 4.0466 μF at 1.8 V, as shown in Figure 35. on the behavior of the capacitors be evaluated for each application.

Figure 35. Typical Capacitor Performance temperature and dc bias effects, is 3 µF. Table 7. Suggested 4.7 μF Capacitors of recommended capacitors is shown in Table 8. Table 8. Suggested 4.7 μF Capacitors package, which reduces thermal constraints. the junction temperature falls below 130°C. TJ is the junction temperature. TA is the ambient temperature. TR is the rise in temperature of the package. ambient temperature of the package. PD is the power dissipation in the package.

• Place the inductor, input capacitor, and output capacitor close to the IC using short tracks. These components carry high switching frequencies, and large tracks act as antennas.
• Route the output voltage path away from the inductor and SW node to minimize noise and magnetic interference.
• Maximize the size of ground metal on the component side to help with thermal dissipation.
• Use a ground plane with several vias connecting to the com- ponent side ground to further reduce noise interference on sensitive circuit nodes.

0.50 REF

Figure 39. 6-Ball Wafer Level Chip Scale Package [WLCSP]

Data Sheet ADP2138/ADP2139 Rev. C | Page 17 of 20 ORDERING GUIDE Model1 Temperature Range Output Voltage (V) Package Description Package Option Branding ADP2138ACBZ-0.8-R7 −40°C to +125°C 0.8 6-Ball Wafer Level Chip Scale Package [WLCSP] CB-6-12 LJH ADP2138ACBZ-1.0-R7 −40°C to +125°C 1.0 6-Ball Wafer Level Chip Scale Package [WLCSP] CB-6-12 L88 ADP2138ACBZ-1.2-R7 −40°C to +125°C 1.2 6-Ball Wafer Level Chip Scale Package [WLCSP] CB-6-12 L89 ADP2138ACBZ-1.5-R7 −40°C to +125°C 1.5 6-Ball Wafer Level Chip Scale Package [WLCSP] CB-6-12 L8A ADP2138ACBZ-1.8-R7 −40°C to +125°C 1.8 6-Ball Wafer Level Chip Scale Package [WLCSP] CB-6-12 L8C ADP2138ACBZ-2.5-R7 −40°C to +125°C 2.5 6-Ball Wafer Level Chip Scale Package [WLCSP] CB-6-12 L93 ADP2138ACBZ-2.8-R7 −40°C to +125°C 2.8 6-Ball Wafer Level Chip Scale Package [WLCSP] CB-6-12 LDH ADP2138ACBZ-3.0-R7 −40°C to +125°C 3.0 6-Ball Wafer Level Chip Scale Package [WLCSP] CB-6-12 LDJ ADP2138ACBZ-3.3-R7 −40°C to +125°C 3.3 6-Ball Wafer Level Chip Scale Package [WLCSP] CB-6-12 LDP ADP2139ACBZ-0.8-R7 −40°C to +125°C 0.8 6-Ball Wafer Level Chip Scale Package [WLCSP] CB-6-12 LJJ ADP2139ACBZ-1.0-R7 −40°C to +125°C 1.0 6-Ball Wafer Level Chip Scale Package [WLCSP] CB-6-12 LHN ADP2139ACBZ-1.2-R7 −40°C to +125°C 1.2 6-Ball Wafer Level Chip Scale Package [WLCSP] CB-6-12 LHP ADP2139ACBZ-1.5-R7 −40°C to +125°C 1.5 6-Ball Wafer Level Chip Scale Package [WLCSP] CB-6-12 LHQ ADP2139ACBZ-1.8-R7 −40°C to +125°C 1.8 6-Ball Wafer Level Chip Scale Package [WLCSP] CB-6-12 LHR ADP2139ACBZ-2.5-R7 −40°C to +125°C 2.5 6-Ball Wafer Level Chip Scale Package [WLCSP] CB-6-12 LHS ADP2139ACBZ-2.8-R7 −40°C to +125°C 2.8 6-Ball Wafer Level Chip Scale Package [WLCSP] CB-6-12 LHT ADP2139ACBZ-3.0-R7 −40°C to +125°C 3.0 6-Ball Wafer Level Chip Scale Package [WLCSP] CB-6-12 LHU ADP2139ACBZ-3.3-R7 −40°C to +125°C 3.3 6-Ball Wafer Level Chip Scale Package [WLCSP] CB-6-12 LHV ADP2138CB-0.8EVALZ Evaluation Board ADP2138CB-1.0EVALZ Evaluation Board ADP2138CB-1.2EVALZ Evaluation Board ADP2138CB-1.5EVALZ Evaluation Board ADP2138CB-1.8EVALZ Evaluation Board ADP2138CB-2.5EVALZ Evaluation Board ADP2138CB-2.8EVALZ Evaluation Board ADP2138CB-3.0EVALZ Evaluation Board ADP2138CB-3.3EVALZ Evaluation Board ADP2139CB-0.8EVALZ Evaluation Board ADP2139CB-1.0EVALZ Evaluation Board ADP2139CB-1.2EVALZ Evaluation Board ADP2139CB-1.5EVALZ Evaluation Board ADP2139CB-1.8EVALZ Evaluation Board ADP2139CB-2.5EVALZ Evaluation Board ADP2139CB-2.8EVALZ Evaluation Board ADP2139CB-3.0EVALZ Evaluation Board ADP2139CB-3.3EVALZ Evaluation Board 1 Z = RoHS Compliant Part.

ADP2138/ADP2139 Data Sheet Rev. C | Page 18 of 20 NOTES

Data Sheet ADP2138/ADP2139 Rev. C | Page 19 of 20 NOTES

ADP2138/ADP2139 Data Sheet Rev. C | Page 20 of 20 NOTES ©2011–2013 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D09496-0-01/13(C)