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4V to 72V Input LDOs with Boost Preregulator

Input LDOs with Boost Preregulators Operate Seamlessly from 4V Cold Crank to 72V Load Dump

Product Details

The MAX5092A/MAX5092B/MAX5093A/MAX5093B low-quiescent-current, low-dropout (LDO) regulators contain simple boost preregulators operating at a high frequency. The devices seamlessly provide a preset 3.3V (MAX5092A/MAX5093A) or 5V (MAX5092B/MAX5093B) LDO output voltage from a cold-crank through load-dump (3.5V to 80V) input voltage conditions. The MAX5092_/MAX5093_ deliver up to 250mA with excellent load and line regulation. During normal operation, when the battery is healthy, the boost preregulator is completely turned off, reducing quiescent current to 65µA (typ). This makes the devices suitable for always-on power supplies.

The buck-boost operation achieved by this combination of LDO and boost preregulator offers the advantage of using a single off-the-shelf inductor in place of the multiple- winding custom magnetics needed in typical single- ended primary inductor converter (SEPIC) and transformer-based flyback topologies. The high operating frequency of the boost regulator significantly reduces component size. The MAX5092_ integrates a blocking diode to further reduce the external component count. The boost preregulator output voltage is preset to 7V. Both LDO and boost output voltages are programmable using external resistors. The boost preregulator output voltage is adjustable up to 11V (MAX5092_), or up to 12V (MAX5093_). The LDO output voltage is adjustable from 1.5V to 9V (MAX5092_) or from 1.5V to 10V (MAX5093_).

The devices feature a shutdown mode with 5µA (typ) shutdown current, a active-low HOLD input to implement a self-holding circuit, and a power-on-reset output (active-low RESET) with an externally programmable timeout period. Additional features include output overload, short-circuit, and thermal protection.

The MAX5092_/MAX5093_ are available in a thermally enhanced, 16-pin 5mm x 5mm thin QFN package and can dissipate up to 2.7W at +70°C on a multilayer PC board.

Key Features

  • Wide Operating Input Voltage Range: 3.5V to 72V with a 4V Startup Voltage
  • LDO Output Regulates to 5V Seamlessly from an Input Voltage of 3.5V to 72V
  • Up to 250mA Output Current
  • Preset 3.3V, 5V, or Externally Programmable LDO Output Voltage from 1.5V to 9V (MAX5092_) or from 1.5V to 10V (MAX5093_)
  • Preset 7V or Externally Programmable Boost Output Voltage Up to 11V (MAX5092_) or Up to 12V (MAX5093_)
  • 65µA Quiescent Current in LDO Mode (VIN ≥ 8V)
  • 5µA Shutdown Current
  • Power-On Reset (Active-Low RESET) with Programmable Timeout Period
  • Output Short-Circuit and Thermal Protection
  • TQFN Package Capable of Dissipating up to 2.7W at +70°C

Applications/Uses

  • Industrial
Parametric specs for Step-Down/Up (Buck Boost) Regulator
VIN (V) (min) 3.5
VIN (V) (max) 72
VOUT1 (V) (min) 1.5
VOUT1 (V) (max) 9
IOUT1 (A) (max) 0.25
Switch Type Internal
Output Adjust. Method Preset
Resistor
ICC (mA) (max) 0.085
# DC-DC Outputs 1
# LDO/ Op.Amp. Outputs 1
Package/Pins TQFN/16
Parametric specs for All LDOs
VIN (V) (min) 3.5
VIN (V) (max) 72
Adj. VOUT (V) (min) 1.5
Adj. VOUT (V) (max) 9
Rated ILOAD (mA) 250
Preset VOUT (V) 5
# Regulators 1
VDROPOUT @Rated ILOAD (V) (typ) 0.9
ICC (µA) (max) 85
Low Batt./ Pwr. Fail Out No
POK/Reset Thresh. (V) (nom) Vout-10%
Watchdog No
Reverse Batt. Protect. No
Oper. Temp. (°C) -40 to +125
Package/Pins TQFN/16
Budgetary
Price (See Notes)
$2.03 @1k
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Simplified Block Diagram

MAX5092, MAX5093: Typical Operating Circuit MAX5092, MAX5093: Typical Operating Circuit Zoom icon

Technical Docs

Design & Development

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Description

The MAX5092 evaluation kit (EV kit) is a fully assembled and tested surface-mount printed-circuit board (PCB) demonstrating the MAX5092B, a low-dropout (LDO) regulator with internal boost preregulator. The EV kit operates from a 4V to 72V input voltage and delivers up to 250mA from a preprogrammed 7V boost preregulator output (BSOUT) and 5V LDO output (VOUT). Both the LDO and the boost preregulator output voltages are programmable using external resistors.

The MAX5092 EV kit features include on-board jumper settings that allow for evaluation of the ENABLE and active-low HOLD functions of the MAX5092, a power-on-reset output (active-low RESET) to indicate LDO out-of-regulation conditions, and a programmable active-low RESET time period.

The MAX5092 EV kit can be configured to demonstrate the MAX5092A (3.3V LDO output) or the MAX5093A/MAX5093B. To evaluate the MAX5092A, replace the IC with the MAX5092A. To evaluate the MAX5093_, the addition of an external Schottky diode is required. See the Configuring for the MAX5093_ section in the full data sheet to modify the MAX5092 EV kit for the MAX5093_.

The EV kit comes fully assembled and tested, is qualified lead-free, and is rated for an operating temperature range of 0°C to +70°C.

Warning: The MAX5092 EV kit is designed to operate with high voltages. Dangerous voltages can be present on this EV kit and on equipment connected to it. Users who power up this EV kit, or the power sources connected to it, must be careful to follow safety procedures appropriate when working with high-voltage electrical equipment.

View Details

Features

  • Wide 4V to 72V Input-Voltage Range
  • Preset 5V LDO Output Voltage
  • Preset 7V Boost Preregulator Output Voltage
  • Adjustable LDO Output Voltage from 1.5V to 9V
  • Adjustable Boost Preregulator Output Voltage Up to 11V
  • Jumper-Programmable ENABLE and Active-Low HOLD Functions
  • Programmable Active-Low HOLD Time Period
  • Surface-Mount Components
  • Lead-Free Evaluation Kit
  • Fully Assembled and Tested

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Parameters

Parametric specs for Step-Down/Up (Buck Boost) Regulator
VIN (V) (min) 3.5
VIN (V) (max) 72
VOUT1 (V) (min) 1.5
VOUT1 (V) (max) 9
IOUT1 (A) (max) 0.25
Switch Type Internal
Output Adjust. Method Preset
Resistor
ICC (mA) (max) 0.085
# DC-DC Outputs 1
# LDO/ Op.Amp. Outputs 1
Package/Pins TQFN/16
Parametric specs for All LDOs
VIN (V) (min) 3.5
VIN (V) (max) 72
Adj. VOUT (V) (min) 1.5
Adj. VOUT (V) (max) 9
Rated ILOAD (mA) 250
Preset VOUT (V) 5
# Regulators 1
VDROPOUT @Rated ILOAD (V) (typ) 0.9
ICC (µA) (max) 85
Low Batt./ Pwr. Fail Out No
POK/Reset Thresh. (V) (nom) Vout-10%
Watchdog No
Reverse Batt. Protect. No
Oper. Temp. (°C) -40 to +125
Package/Pins TQFN/16
Budgetary
Price (See Notes)
$2.03 @1k

Key Features

  • Wide Operating Input Voltage Range: 3.5V to 72V with a 4V Startup Voltage
  • LDO Output Regulates to 5V Seamlessly from an Input Voltage of 3.5V to 72V
  • Up to 250mA Output Current
  • Preset 3.3V, 5V, or Externally Programmable LDO Output Voltage from 1.5V to 9V (MAX5092_) or from 1.5V to 10V (MAX5093_)
  • Preset 7V or Externally Programmable Boost Output Voltage Up to 11V (MAX5092_) or Up to 12V (MAX5093_)
  • 65µA Quiescent Current in LDO Mode (VIN ≥ 8V)
  • 5µA Shutdown Current
  • Power-On Reset (Active-Low RESET) with Programmable Timeout Period
  • Output Short-Circuit and Thermal Protection
  • TQFN Package Capable of Dissipating up to 2.7W at +70°C

Applications/Uses

  • Industrial

Description

The MAX5092A/MAX5092B/MAX5093A/MAX5093B low-quiescent-current, low-dropout (LDO) regulators contain simple boost preregulators operating at a high frequency. The devices seamlessly provide a preset 3.3V (MAX5092A/MAX5093A) or 5V (MAX5092B/MAX5093B) LDO output voltage from a cold-crank through load-dump (3.5V to 80V) input voltage conditions. The MAX5092_/MAX5093_ deliver up to 250mA with excellent load and line regulation. During normal operation, when the battery is healthy, the boost preregulator is completely turned off, reducing quiescent current to 65µA (typ). This makes the devices suitable for always-on power supplies.

The buck-boost operation achieved by this combination of LDO and boost preregulator offers the advantage of using a single off-the-shelf inductor in place of the multiple- winding custom magnetics needed in typical single- ended primary inductor converter (SEPIC) and transformer-based flyback topologies. The high operating frequency of the boost regulator significantly reduces component size. The MAX5092_ integrates a blocking diode to further reduce the external component count. The boost preregulator output voltage is preset to 7V. Both LDO and boost output voltages are programmable using external resistors. The boost preregulator output voltage is adjustable up to 11V (MAX5092_), or up to 12V (MAX5093_). The LDO output voltage is adjustable from 1.5V to 9V (MAX5092_) or from 1.5V to 10V (MAX5093_).

The devices feature a shutdown mode with 5µA (typ) shutdown current, a active-low HOLD input to implement a self-holding circuit, and a power-on-reset output (active-low RESET) with an externally programmable timeout period. Additional features include output overload, short-circuit, and thermal protection.

The MAX5092_/MAX5093_ are available in a thermally enhanced, 16-pin 5mm x 5mm thin QFN package and can dissipate up to 2.7W at +70°C on a multilayer PC board.

Simplified Block Diagram

MAX5092, MAX5093: Typical Operating Circuit MAX5092, MAX5093: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal.