Features and Benefits

  • Input voltage range: 2.3 V to 5.5 V
  • One 0.8 A buck regulator
  • Two 300 mA LDOs
  • 20-lead, 4 mm x~ 4 mm LFCSP package
  • Initial regulator accuracy: ±1%
  • Overcurrent and thermal protection
  • Soft start
    Undervoltage lockout
    Open drain processor reset with threshold monitoring - ±1.5% threshold accuracy over the full temperate range
  • Guaranteed reset output valid to VCC = 1 V
  • Dual watchdog for secure systems
    Watchdog 1 controls reset
    Watchdog 2 controls reset and regulators power cycle
  • Buck key specifications
    Current mode topology for excellent transient response
    3 MHz operating frequency
    Uses tiny multilayer inductors and capacitors
  • Mode pin selects forced PWM or auto PFM/PSM modes
    100% duty cycle low dropout mode
  • LDOs key specifications
    Low VIN from 1.7 V to 5.5 V
    Stable with1 μF ceramic output capacitors
    High PSRR, 60 dB PSRR up to 1 kHz/10 kHz
  • Low output noise: 110 μV rms typical output noise at VOUT = 2.8 V
    Low dropout voltage: 150 mV at 300 mA load
    -40°C to +125°C junction temperature range

Product Details

The ADP5042 combines one high performance buck regulator and two low dropout regulators (LDO) in a small 20-lead LFCSP to meet demanding performance and board space requirements.

The high switching frequency of the buck regulator enables use of tiny multilayer external components and minimizes the board space.

The MODE pin selects the buck mode of operation. When set to logic high, the buck regulators operate in forced PWM mode. When the MODE pin is set to logic low, the buck regulators operate in PWM mode when the load is around the nominal value. When the load current falls below a predefined threshold the regulator operates in power save mode (PSM) improving the light-load efficiency.

The low quiescent current, low dropout voltage, and wide input voltage range of the ADP5042 LDOs extend the battery life of portable devices. The two LDOs maintain power supply rejection greater than 60 dB for frequencies as high as 10 kHz while operating with a low headroom voltage.

Each regulator is activated by a high level on the respective enable pin. The ADP5042 is available with factory programmable default output voltages and can be set to a wide range of options.

The ADP5042 contains supervisory circuits that monitor power supply voltage levels and code execution integrity in microprocessor-based systems. They also provide power-on reset signals. An on-chip dual watchdog timer can reset the microprocessor or power cycle the system (Watchdog 2) if it fails to strobe within a preset timeout period.

Product Lifecycle icon-recommended 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.

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ADI Linear Regulator Design Tool and Parametric Search

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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.

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