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Versatile Automotive 60V/70V 2.2MHz Buck Controller with 7µA IQ and Optional Bypass Mode

Industry's Lowest 60V/70V IQ Automotive Synchronous Step-Down Controller Uses Only 7µA of Quiescent Current

Product Details

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 3.5
VIN (V) (max) 75
VOUT1 (V) (min) 0.7
VOUT1 (V) (max) 20
IOUT1 (A) (max) 22
Switch Type External
Preset VOUT (V) 5
Output Adjust. Method Preset or Adj
Synchronous Switching? Yes
Power Good Signal Yes
IQ (mA) (typ) .007
# DC-DC Outputs 1
Switching Frequency (kHz) 2200
Design Tools EE-Sim
Package/Pins TQFN-CU/20
Budgetary
Price (See Notes)
2.49
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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) 75
VOUT1 (V) (min) 0.7
VOUT1 (V) (max) 20
IOUT1 (A) (max) 22
Switch Type External
Preset VOUT (V) 5
Output Adjust. Method Preset or Adj
Synchronous Switching? Yes
Power Good Signal Yes
IQ (mA) (typ) .007
# DC-DC Outputs 1
Switching Frequency (kHz) 2200
Design Tools generateDesignEESIMUrl('http://maxim.transim.com/pwm2/designreq/Index?partId=27030', '')
Package/Pins TQFN-CU/20
Budgetary
Price (See Notes)
2.49

Key Features

  • Meets Stringent OEM Module Power Consumption and Performance Specifications
    • 7µA Quiescent Current in Skip Mode at VOUT = 3.3V
    • ±1.5% Output-Voltage Accuracy: 5.0V/3.3V Fixed, or Adjustable Between 1V and 10V
  • 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
    • 2.2MHz Step-Down Controller
    • 180° Out-of-Phase SYNCOUT Output for Synchronization
    • Current-Mode Controller with Forced-Continuous and Skip Modes
    • Thermally Enhanced 20-Pin Side-Wettable (SW) TQFN-EP Package
  • 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

  • 24V Truck systems, Infotainment Systems, 48V systems

Description

The MAX25206/MAX25207/MAX25208 are automotive 2.2MHz synchronous step-down controller IC with 7µA IQ. This IC operates with an input-voltage supply from 3.5V to 60V (MAX25206/7) and 70V (MAX25208). They can operate in dropout condition by running at 99% (typ) duty cycle. These controllers are 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 MAX25207 has an optional bypass mode which allows 100% high-side switch on until step-down function is needed during automotive transients.

The MAX25206/MAX25207/MAX25208 step-down controllers operate 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 (220 kHz to 2200 kHz). 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 IC also provides SYNCOUT output to enable two controllers to operate in parallel. The MAX25206/MAX25207/MAX25208 have a pin selectable spread-spectrum option for frequency modulation to minimize EMI interference.

The MAX25206/MAX25207/MAX25208 feature a PGOOD monitor and undervoltage lockout. Protection features include cycle-by-cycle current limit and thermal shutdown. These controllers are specified for operation over the -40°C to +125°C automotive temperature range.

Simplified Block Diagram

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 .