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Dual Buck, Sync Boost and LDO–Complete Front-End Power Supply with 17μA IQ

Complete Front End Automotive Power Supply Enables a Space-Efficient, Crank-Ready Design

Product Details

The MAX20030/MAX20031 ICs are automotive 2.2MHz dual-synchronous step-down controllers with preboost controller and low-IQ LDO. The preboost controller enables VOUT1 and VOUT2 to stay in regulation during cold-crank operation all the way down to battery input of 2V. The ICs offer two high-voltage synchronous step-down controllers that operate 180 degrees out of phase. This device operates with an input-voltage supply from 3.5V to 42V and can operate in dropout conditions by running at 97% duty cycle. It is intended for applications with mid- to high-power requirements that operate at a wide input voltage range, such as during automotive cold-crank or engine stop-start conditions.

The step-down controllers operate at a frequency of up to 2.2MHz to allow small external components, reduced output ripple, and to guarantee no AM band interference. The switching frequency is resistor-adjustable (220kHz to 2200kHz). SYNC input programmability enables three frequency modes for optimized performance: forced fixed-frequency operation, skip mode with ultra-low quiescent current, and synchronization to an external clock. The ICs have a spread-spectrum pin for frequency modulation to minimize EMI interference.

The ICs will be offered with a synchronous step-up controller. This preboost circuitry turns on during low input-voltage conditions, and is designed to provide power to step-down controller channels with input voltages as low at 2V.

The ICs feature a power-OK monitor and overvoltage and undervoltage lockout. Protection features include cycle-by-cycle current limit and thermal shutdown. The MAX20030/MAX20031 are specified for operation over the -40°C to +125°C automotive temperature range.

Key Features

  • Meets Stringent OEM Module Power Consumption and Performance Specifications
    • 17µA IQ with 3.3V Buck On
    • 25µA IQ with 5V Buck On
    • 25µA IQ with LDO On
    • 65µA IQ with All Controllers Enabled
  • Enables Crank-Ready Designs
    • Synchronous Boost Converter for High-Current Capability and Efficiency
  • EMI Reduction Features Reduce Interference with Sensitive Radio Bands without Sacrificing Wide Input Voltage Range
    • 50ns (typ) Minimum On-Time Guarantees Skip-Free Operation for 3.3V Output from Car Battery at 2.2MHz
    • Forced Fixed-Frequency PWM Operation
    • Resistor-Programmable Frequency Between 220kHz and 2.2MHz
    • Pin-Selectable Spread Spectrum
  • Integration and Thermally Enhanced Packages Save Board Space and Cost
    • Dual 2.2MHz Step-Down Controller with Synchronous Boost Controller and HV 200mA LDO
    • Current-Mode Controller with Forced-Fixed Frequency and Skip Modes
    • Thermally Enhanced 7mm x 7mm, 48-Pin TQFN Packages with Exposed Pad
  • Protection Features Improve System Reliability
    • Supply Overvoltage and Undervoltage Lockout
    • Overtemperature and Short-Circuit Protections

Applications/Uses

  • Distributed DC Power Systems
  • Instrument Cluster
  • Navigation and Radio Head Units
Parametric specs for Step-Down/Up Switching Regulators
VIN (V) (min) 2
VIN (V) (max) 42
VOUT1 (V) (min) 1
VOUT1 (V) (max) 10
IOUT1 (A) (max) 10
Switch Type External
Preset VOUT (V) 5
VOUT1 Tolerance (±%) 1
Output Adjust. Method Preset
Resistor
Synchronous Switching? Yes
Power Good Signal Yes
ICC (mA) (max) 0.017
Alternate Topology Step-Down
Step-Up
# LDO/ Op.Amp. Outputs 1
Switching Frequency (kHz) 1000
2200
2500
Design Tools EE-Sim
Package/Pins TQFN-CU/48
Oper. Temp. (°C) -40 to +125
Budgetary
Price (See Notes)
$5.23 @1k
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Simplified Block Diagram

MAX20030, MAX20031: Block Diagram MAX20030, MAX20031: Block Diagram Zoom icon

Technical Docs

Design & Development

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Description

The MAX20030 evaluation kit (EV kit) is a fully assembled and tested application circuit for the MAX20030 highvoltage, dual-synchronous step-down controller IC with preboost and an internal LDO. The EV kit is set up to provide 5V and 3.3V from an input voltage ranging from 3.5V to 36V. The preboost circuit maintains the 10V supply rail for input voltages below 10V. Each buck rail can deliver up to 5A load current. Various jumpers are provided to help evaluate features of the IC. The EV kit can also be used to evaluate the pin-compatible MAX20031 with IC replacement of U1.

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Features

  • Dual-Synchronous Step-Down Controllers Operate at 180° Out-of-Phase to Reduce Switching Noise
  • Preboost Controller Maintains Operation with Low Supply Voltage
  • 3.5V to 36V Wide Input Supply Range
  • Buck Output Voltage: 5V and 3.3V Fixed or Adjustable Between 1V and 10V
  • 5V, 200mA LDO Output
  • Current-Mode Controllers with Forced-PWM and Skip Modes
  • Resistor-Programmable Frequency Between 1MHz and 2.2MHz
  • Frequency Synchronization Input
  • Independent Enable Inputs
  • Voltage-Monitoring PGOOD_ Outputs
  • Proven PCB Layout
  • Fully Assembled and Tested

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Tools & Models

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Parameters

Parametric specs for Step-Down/Up Switching Regulators
VIN (V) (min) 2
VIN (V) (max) 42
VOUT1 (V) (min) 1
VOUT1 (V) (max) 10
IOUT1 (A) (max) 10
Switch Type External
Preset VOUT (V) 5
VOUT1 Tolerance (±%) 1
Output Adjust. Method Preset
Resistor
Synchronous Switching? Yes
Power Good Signal Yes
ICC (mA) (max) 0.017
Alternate Topology Step-Down
Step-Up
# LDO/ Op.Amp. Outputs 1
Switching Frequency (kHz) 1000
2200
2500
Design Tools EE-Sim
Package/Pins TQFN-CU/48
Oper. Temp. (°C) -40 to +125
Budgetary
Price (See Notes)
$5.23 @1k

Key Features

  • Meets Stringent OEM Module Power Consumption and Performance Specifications
    • 17µA IQ with 3.3V Buck On
    • 25µA IQ with 5V Buck On
    • 25µA IQ with LDO On
    • 65µA IQ with All Controllers Enabled
  • Enables Crank-Ready Designs
    • Synchronous Boost Converter for High-Current Capability and Efficiency
  • EMI Reduction Features Reduce Interference with Sensitive Radio Bands without Sacrificing Wide Input Voltage Range
    • 50ns (typ) Minimum On-Time Guarantees Skip-Free Operation for 3.3V Output from Car Battery at 2.2MHz
    • Forced Fixed-Frequency PWM Operation
    • Resistor-Programmable Frequency Between 220kHz and 2.2MHz
    • Pin-Selectable Spread Spectrum
  • Integration and Thermally Enhanced Packages Save Board Space and Cost
    • Dual 2.2MHz Step-Down Controller with Synchronous Boost Controller and HV 200mA LDO
    • Current-Mode Controller with Forced-Fixed Frequency and Skip Modes
    • Thermally Enhanced 7mm x 7mm, 48-Pin TQFN Packages with Exposed Pad
  • Protection Features Improve System Reliability
    • Supply Overvoltage and Undervoltage Lockout
    • Overtemperature and Short-Circuit Protections

Applications/Uses

  • Distributed DC Power Systems
  • Instrument Cluster
  • Navigation and Radio Head Units

Description

The MAX20030/MAX20031 ICs are automotive 2.2MHz dual-synchronous step-down controllers with preboost controller and low-IQ LDO. The preboost controller enables VOUT1 and VOUT2 to stay in regulation during cold-crank operation all the way down to battery input of 2V. The ICs offer two high-voltage synchronous step-down controllers that operate 180 degrees out of phase. This device operates with an input-voltage supply from 3.5V to 42V and can operate in dropout conditions by running at 97% duty cycle. It is intended for applications with mid- to high-power requirements that operate at a wide input voltage range, such as during automotive cold-crank or engine stop-start conditions.

The step-down controllers operate at a frequency of up to 2.2MHz to allow small external components, reduced output ripple, and to guarantee no AM band interference. The switching frequency is resistor-adjustable (220kHz to 2200kHz). SYNC input programmability enables three frequency modes for optimized performance: forced fixed-frequency operation, skip mode with ultra-low quiescent current, and synchronization to an external clock. The ICs have a spread-spectrum pin for frequency modulation to minimize EMI interference.

The ICs will be offered with a synchronous step-up controller. This preboost circuitry turns on during low input-voltage conditions, and is designed to provide power to step-down controller channels with input voltages as low at 2V.

The ICs feature a power-OK monitor and overvoltage and undervoltage lockout. Protection features include cycle-by-cycle current limit and thermal shutdown. The MAX20030/MAX20031 are specified for operation over the -40°C to +125°C automotive temperature range.

Simplified Block Diagram

MAX20030, MAX20031: Block Diagram MAX20030, MAX20031: Block Diagram 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