Features and Benefits
- PVINx voltage range: 3 V to 5.5 V
- Continuous output current
- Channel 1 to Channel 4 (buck): 1 A
- Channel 5 (LDO): 250 mA
- 3.2 MHz fixed PWM switching frequency
- Synchronization input function
- Buck regulators run at 90° out of phase
- Individual precision enable input
- Power-on reset output
- Integrated compensation
- Soft start and power-up sequencing reduce inrush current
- Active output discharge switch function
- Stable with low ESR output ceramic capacitors
- OVLO, UVM, and UVLO
- TSD protection
- Qualified for automotive applications
The ADP5138 integrates four high performance synchronous step-down regulators and one low noise radio frequency (RF) low dropout (LDO) regulator. The device runs from PVINx input voltages of 3 V to 5.5 V. The output voltage of each channel is factory set or can be programmed down to 0.8 V with a resistor. Each step-down regulator can provide up to 1 A of continuous output current and the LDO can provide 250 mA of output current.
The ADP5138 runs at the fixed PWM switching frequency, 3.2 MHz, or can be synchronized to the external clock from 2.8 MHz to 3.5 MHz, which is outside the amplitude modulation (AM) band. The four buck regulators run at 90° out of phase to reduce the input ripple current and the input capacitor size, thereby helping to lower system electromagnetic interference (EMI).
The ADP5138 integrates internal compensation to simplify the design. The internal soft start circuitry and power-up sequencing help reduce the input inrush current.
The ADP5138 monitors the input voltage and provides input overvoltage lockout (OVLO), undervoltage monitor (UVM), and undervoltage lockout (UVLO) features. It also monitors the undervoltage and overvoltage of the outputs. The power-on reset (POR) signal is asserted when the input or output voltage fault occurs.
Additional protection includes overcurrent protection (OCP) and thermal shutdown (TSD).
The ADP5138 operates over the −40°C to +125°C operating temperature range (junction), and is available in a 28-lead LFCSP package.
- Industrial and instrumentation
- DC-to-dc point of load application
Product Lifecycle Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (1)
The ADP5138W-1-EVALZ evaluation board provides a complete and compact solution that allows users to evaluate the performance of the ADP5138 with a near ideal printed circuit board (PCB) layout.
The main device on the evaluation board, the ADP5138, integrates four high performance synchronous step-down regulators and one low noise radio frequency (RF) low dropout (LDO) regulator.
The ADP5138W-1-EVALZ has independent enable controls for each regulator that allow flexible configuration when evaluating the ADP5138.
Full details on the ADP5138 regulator are provided in the ADP5138 data sheet, available from Analog Devices, Inc. Consult the data sheet in conjunction with this user guide when working with the ADP5138W-1-EVALZ.
Features & Benefits
- Full featured evaluation board for the ADP5138
- Compact solution size
- 4-layer high glass transition temperature PCB for superior thermal performance
- Connections through vertical printed circuit tail pin headers
- Supply voltage
- 3 V to 5.5 V (5 V typical) for PVINx
- Fixed or adjustable output options for quad 1 A buck regulators and one 250 mA RF LDO regulator
- Independent enable control for each regulator
- Power-on reset output
Tools & Simulations
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Models for the following parts are available in LTspice:
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
Sample & Buy
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.