ADP5133: Dual 3 MHz, 800 mA Buck Regulators in WLCSP

Product catalog summary

Features
The ADP5133 includes two 800 mA buck regulators with an input voltage range of 2.3 V to 5.5 V, housed in a compact 16-ball, 2 mm × 2 mm WLCSP package. It offers an accuracy of ±1.8% and supports both factory programmable and externally adjustable output voltages. The regulators operate at a frequency of 3 MHz with modes for forced PWM and auto PWM/PSM.

Applications
This device is ideal for powering processors, ASICs, FPGAs, RF chipsets, portable instrumentation, medical devices, and other space-constrained applications.

General Description
The ADP5133 integrates two high-performance buck regulators designed to meet stringent performance and board space requirements. The high switching frequency allows for the use of small external components, minimizing board space. The device supports both forced PWM and auto PWM/PSM modes, optimizing efficiency under varying load conditions. The regulators operate out of phase to reduce input capacitor requirements and noise.

Specifications

Input Voltage Range: 2.3 V to 5.5 V
Output Voltage Range: 0.8 V to 3.8 V
Thermal Shutdown: 150°C threshold with 20°C hysteresis
Start-Up Time: 250 μs for BUCK1 and 300 μs for BUCK2
Standby Current: 87 μA with all channels enabled

Performance Characteristics
The device demonstrates efficient performance across a range of input voltages and load currents. Efficiency graphs indicate performance in both PWM and PSM modes, with efficiency peaking at different load currents depending on the mode and input voltage.

Pin Configuration
The ADP5133 features a detailed pin configuration with specific functions for each pin, including feedback inputs, enable pins, and switching nodes for both buck regulators.

Thermal and Power Considerations
The device's thermal resistance is specified for worst-case conditions, ensuring reliable operation within the specified temperature range. Proper PCB layout and thermal management are crucial for optimal performance.

Theory of Operation
The unit includes a system controller for synchronized operation of the buck regulators. It supports both forced PWM mode and auto PWM/PSM mode, with transitions controlled independently for each buck. The device includes thermal shutdown and undervoltage lockout (UVLO) features to protect against overheating and battery discharge.

Control Scheme
The ADP5133 uses a fixed frequency, current mode PWM control architecture for high efficiency at medium to high loads, and shifts to PSM control at light loads to reduce power losses. The PSM current threshold is set at 100 mA, ensuring efficient operation across load currents.

Protection Features
The device includes short-circuit protection with frequency foldback, soft start to limit inrush current, and current limit protection for both positive and negative currents. It also supports 100% duty operation for conditions where the input voltage drops or load current increases significantly.

Applications Information
The document provides guidance on selecting external components such as feedback resistors, inductors, and output capacitors. It emphasizes the importance of considering factors like efficiency, transient response, and component tolerances. Suggested inductor models and considerations for output capacitor selection are provided to optimize performance.

Figures and Waveforms
The document includes various figures illustrating typical waveforms, response to line and load transients, and functional block diagrams. These visual aids help in understanding the operation and performance characteristics of the ADP5133.

Power Dissipation and Thermal Considerations
The device operates efficiently, but at high temperatures and loads, the junction temperature can reach 125°C. If it exceeds 150°C, the device shuts down until it cools below 130°C. Power dissipation is calculated using efficiency equations, and the total power dissipation is the sum of the power dissipated in both buck converters.

Buck Regulator Power Dissipation
Power loss in the buck regulator includes conductive, switching, and transition losses. Conductive losses depend on the internal resistance of the MOSFETs, while switching losses are related to the gate capacitance and switching frequency. Transition losses occur due to the non-instantaneous switching of the MOSFETs.

Junction Temperature
The junction temperature can be estimated using the thermal resistance parameter, θJA, and the power dissipation. The reliable operation is ensured if the junction temperature remains below 125°C.

PCB Layout Guidelines
Proper layout is crucial to avoid EMI, EMC issues, and ensure stability. Key guidelines include placing components close to the IC, routing paths to minimize interference, and maximizing ground metal for thermal dissipation.

Typical Application Schematics
Figures 34 and 35 illustrate typical application schematics for fixed and adjustable output voltages, showing how the ADP5133 can be controlled by a processor.

Ordering Guide
The ADP5133 is available in a 16-ball WLCSP package, with options for adjustable output voltages and active pull-down resistors.

Catalog excerpts

ADP5133: Dual 3 MHz, 800 mA Buck Regulators in WLCSP-1

Dual 3 MHz, 800 mA Buck Regulators in WLCSP Data Sheet FEATURES The two bucks operate out of phase to reduce the input capacitor requirement and noise. Input voltage range: 2.3 V to 5.5 V Two 800 mA buck regulators Tiny, 16-ball, 2 mm × 2 mm WLCSP package Regulator accuracy: ±1.8% Factory programmable or external adjustable VOUTx 3 MHz buck operation with forced PWM and auto PWM/PSM modes BUCK1/BUCK2: output voltage range from 0.8 V to 3.8 V The regulators in the ADP5133 are activated through dedicated enable pins. The output voltages can be externally set through a resistor feedback network. Table 1. Related Devices Maximum Current 800 mA, 300 mA 1.2 A, 300 mA 1.2 A, 300 mA APPLICATIONS Power for processors, ASICs, FPGAs, and RF chipsets Portable instrumentation and medical devices Space constrained devices GENERAL DESCRIPTION Channels 2 Bucks, 1 LDO 2 Bucks, 1 LDO 2 Bucks, 2 LDOs 2 Bucks, 2 LDOs 2 Bucks, 2 LDOs with 2 ENx pins 1 Buck, 2 LDOs 1 Buck, 2 LDOs with supervisory, watchdog, manual reset 2 Bucks with 2 ENx pins 2 Bucks, 2 LDOs with precision enable and power-good output The ADP5133 combines two high performance buck regulators in a tiny, 16-ball, 2 mm × 2 mm WLCSP to meet demanding performance and board space requirements. The high switching frequency of the buck regulators enables tiny multilayer external components and minimizes the board space. When the MODE pin is set high, the buck regulators operate in forced PWM mode. When the MODE pin is set low and the buck regulators operate in PWM mode, the load current is above a predefined threshold. When the load current falls below a predefined threshold, the regulators operate in power save mode (PSM), improving the light load efficiency. Package LFCSP (CP-24-10) LFCSP (CP-24-10) LFCSP (CP-24-10), TSSOP (RE-28-1) LFCSP (CP-24-10) WLCSP (CB-16-8) TYPICAL APPLICATION CIRCUIT ADP5133 VOUT1 2.3V TO 5.5V FPWM AUTO 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. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 ©2014 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com

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ADP5133: Dual 3 MHz, 800 mA Buck Regulators in WLCSP-2

Data Sheet REVISION HISTORY 4/14—Revision 0: Initial Version

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ADP5133: Dual 3 MHz, 800 mA Buck Regulators in WLCSP-3

Data Sheet SPECIFICATIONS GENERAL SPECIFICATIONS VIN1 = VIN2 = 2.3 V to 5.5 V, TJ = −40°C to +125°C for minimum/maximum specifications, and TA = 25°C for typical specifications, unless otherwise noted. Table 2. Parameter INPUT VOLTAGE RANGE THERMAL SHUTDOWN Threshold Hysteresis START-UP TIME1 BUCK1 BUCK2 EN1, EN2, MODE INPUTS Input Logic High Input Logic Low Input Leakage Current STANDBY CURRENT All Channels Enabled All Channels Disabled VIN1 UNDERVOLTAGE LOCKOUT UVLO Input Voltage Rising UVLO Input Voltage Falling 1 Test Conditions/Comments TSSD TSSD-HYS ISTBY-NOSW ISHUTDOWN Start-up time is...

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ADP5133: Dual 3 MHz, 800 mA Buck Regulators in WLCSP-4

Data Sheet BUCK1 AND BUCK2 SPECIFICATIONS VIN1 = VIN2 = 2.3 V to 5.5 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 3. Parameter INPUT CHARACTERISTICS Input Voltage Range OUTPUT CHARACTERISTICS Output Voltage Accuracy Line Regulation Load Regulation VOLTAGE FEEDBACK PSM CURRENT THRESHOLD PSM to PWM Operation OPERATING SUPPLY CURRENT BUCK1 Only Test Conditions/Comments BUCK2 Only BUCK1 and BUCK2...

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ADP5133: Dual 3 MHz, 800 mA Buck Regulators in WLCSP-5

Data Sheet ABSOLUTE MAXIMUM RATINGS Storage Temperature Range Operating Junction Temperature Range Soldering Conditions Stresses at or above those listed under Absolute Maximum Ratings may cause permanent damage to the product. This is a stress rating only; functional operation of the product at these or any other conditions above those indicated in the operational section of this specification is not implied. Operation beyond the maximum operating conditions for extended periods may affect product reliability. For detailed information on power dissipation, see the Power Dissipation and Thermal...

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ADP5133: Dual 3 MHz, 800 mA Buck Regulators in WLCSP-6

Data Sheet PIN CONFIGURATION AND FUNCTION DESCRIPTIONS BALL A1 INDICATOR 2 AGND AGND TOP VIEW (BALL SIDE DOWN) Not to Scale Table 7. Pin Function Descriptions Pin No. A1 AGND MODE Description BUCK1 Feedback Input. For device models with an adjustable output voltage, connect this pin to the middle of the BUCK1 resistor divider. For device models with a fixed output voltage, leave this pin unconnected. Analog Ground. Analog Ground. BUCK2 Feedback Input. For device models with an adjustable output voltage, connect this pin to the middle of the BUCK2 resistor divider. For device models with a fixed...

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ADP5133: Dual 3 MHz, 800 mA Buck Regulators in WLCSP-7

Data Sheet TYPICAL PERFORMANCE CHARACTERISTICS VIN1 = VIN2 = 3.6 V, TA = 25°C, unless otherwise noted. 140 3.310 Figure 3. System Quiescent Current vs. Input Voltage, VOUT1 = 1.8 V, VOUT2 = 1.8 V, All Channels Enabled Figure 6. BUCK1 Load Regulation Across Temperature, VIN = 4.2 V, VOUT1 = 3.3 V, PWM Mode 1.812 Figure 7. BUCK2 Load Regulation Across Temperature,VIN = 3.6 V, VOUT2 = 1.8 V, PWM Mode Figure 8. BUCK1 Load Regulation Across Temperature, VIN = 3.6 V, VOUT1 = 0.8 V, PWM Mode

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ADP5133: Dual 3 MHz, 800 mA Buck Regulators in WLCSP-8

Figure 9. BUCK1 Efficiency vs. Load Current, Across Input Voltage, VOUT1 = 3.3 V, Auto PWM/PSM Mode Figure 10. BUCK1 Efficiency vs. Load Current, Across Input Voltage, VOUT1 = 3.3 V, PWM Mode Figure 13. BUCK1 Efficiency vs. Load Current, Across Input Voltage, VOUT1 = 0.8 V, Auto PWM/PSM Mode Figure 11. BUCK2 Efficiency vs. Load Current, Across Input Voltage, VOUT2 = 1.8 V, Auto PWM/PSM Mode Figure 12. BUCK2 Efficiency vs. Load Current, Across Input Voltage, VOUT2 = 1.8 V, PWM Mode Figure 14. BUCK1 Efficiency vs. Load Current, Across Input Voltage, VOUT1 = 0.8 V, PWM Mode

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