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Versatile Automotive 36V 2.2MHz Buck Controller with 3.5µA IQ

Industry's Lowest IQ Automotive Synchronous Step-Down Controller Uses Only 3.5µA of Quiescent Current at Light Loads

Product Details

Key Features

Applications/Uses

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 3.5
VIN (V) (max) 42
VOUT1 (V) (min) 1
VOUT1 (V) (max) 10
IOUT1 (A) (max) 15
Switch Type External
Preset VOUT (V) 5
Output Adjust. Method Preset
Resistor
Synchronous Switching? Yes
Power Good Signal Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 1200
1700
2000
2100
220
250
275
300
330
350
400
440
500
540
560
600
700
750
800
2200
Design Tools EE-Sim
Package/Pins TQFN-CU/16
Budgetary
Price (See Notes)
1.15
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Simplified Block Diagram

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Parameters

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 3.5
VIN (V) (max) 42
VOUT1 (V) (min) 1
VOUT1 (V) (max) 10
IOUT1 (A) (max) 15
Switch Type External
Preset VOUT (V) 5
Output Adjust. Method Preset
Resistor
Synchronous Switching? Yes
Power Good Signal Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 1200
1700
2000
2100
220
250
275
300
330
350
400
440
500
540
560
600
700
750
800
2200
Design Tools generateDesignEESIMUrl('http://maxim.transim.com/pwm2/designreq/Index?partId=9802', '')
Package/Pins TQFN-CU/16
Budgetary
Price (See Notes)
1.15

Key Features

  • Meets Stringent OEM Module Power Consumption and Performance Specifications
    • 3.5µA Quiescent Current in Skip Mode at VOUT = 3.3V
    • Fixed 5.0V/3.3V or Adjustable 1V to 10V Output
    • ±1.1% Output-Voltage Accuracy for 5V Fixed Setting
  • Enables Crank-Ready Designs
    • Wide Input Supply Range from 3.5V to 42V
  • 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
    • Spread-Spectrum Option
    • Frequency-Synchronization Input
    • Resistor-Programmable Frequency Between 220kHz and 2.2MHz
  • Integration and Thermally Enhanced Packages Save Board Space and Cost
    • 2MHz Step-Down Controller
    • Current-Mode Controller with Forced-Continuous and Skip Modes
    • 16-Pin Side-Wettable (SW) TQFN-EP Package
    • 20A Reference Design Available
  • Protection Features Improve System Reliability
    • Supply Undervoltage Lockout
    • Overtemperature and Short-Circuit Protection
    • Output Overvoltage and Undervoltage Monitoring
    • -40°C to +125°C Grade 1 Automotive Temperature Range

Applications/Uses

  • General-Purpose Point-of-Load (POL)
  • Infotainment Systems
  • USB Hub

Description

The MAX20098 is an automotive 2.2MHz synchronous step-down controller IC with 3.5µA IQ. This IC operates with an input-voltage supply from 3.5V to 42V and can operate in dropout condition by running at 99% 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 controller operates at up to 2.2MHz frequency to allow small external components, reduced output ripple, and to guarantee no AM band interference. The switching frequency is resistor adjustable (220kHz to 2.2MHz). FSYNC 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 IC also provides a SYNC output to enable two controllers to operate in parallel. The IC has a factory-programmable spread-spectrum option for frequency modulation to minimize EMI interference.

The PGOOD output indicates when the voltage is within regulation range. Protection features include cycle-by-cycle current limit and thermal shutdown. The MAX20098 is specified for operation over the -40°C to +125°C automotive temperature range.

Simplified Block Diagram

MAX20098 MAX20098 Zoom icon

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 .