MAX17233

3.5V–36V, 2.2MHz, Synchronous Dual Buck Controller with 20μA Quiescent Current

Synchronous Dual Buck Controller with Wide VIN (3.5V to 42V) and Low IQ (20μA)


Description

The MAX17232/MAX17233 offers dual synchronous step-down DC-DC controllers with integrated MOSFETs. They operates over a 3.5V to 36V input voltage range with 42V input transient protection, and can operate in dropout condition by running at 95% duty cycle. The controllers can generate fixed output voltages of 3.3V/5V, along with the capability to program the output voltage between 1V to 10V.

These devices use a current-mode-control architecture.The devices can be operated in pulse-width modulation (PWM) or pulse-frequency modulation (PFM) control schemes. PWM operation provides constant frequency operation at all loads, and is useful in applications sensitive to switching frequency. PFM operation disables negative inductor current and additionally skips pulses at light loads for high efficiency. The low-resistance, on-chip MOSFETs ensure high efficiency at full load and simplify the layout.

The devices are available in a 28-pin TQFN-EP package with exposed pad, and are specified for operation over -40°C to +85°C.
MAX17232, MAX17233: Block Diagram MAX17232, MAX17233: Block Diagram Enlarge+

Key Features

  • Eliminates External Components and Reduces Total Cost
    • No Schottky-Synchronous Operation for High Efficiency and Reduced Cost
    • Simple External RC Compensation for Stable Operation at Any Output Voltage
    • All-Ceramic Capacitor Solution: Ultra-Compact Layout
    • 180° Out-of-Phase Operation Reduces Output Ripple and Enables Cascaded Power Supplies
  • Reduces Number of DC-DC Controllers to Stock
    • Fixed Output Voltage with ±1% Accuracy (5V/3.3V)or Externally Resistor Adjustable (1V to 10V)
    • 220kHz to 2.2MHz Adjustable Frequency with External Synchronization
    • Frequency Synchronization Input
  • Reduces Power Dissipation
    • 92% Peak Efficiency
    • 8μA (typ) in Shutdown
    • 20μA (typ) Quiescent Current in PFM Mode
  • Operates Reliably
    • 42V Input Voltage Transient Protection
    • Cycle-by-Cycle Current Limit, Thermal Shutdown
    • Supply Overvoltage and Undervoltage Lockout
    • Power-OK Monitor
    • Reduced EMI Emission with Spread-Spectrum Control
    • 50ns (typ) Minimum On-Time Guarantees PWM Operation at Low Duty Cycle at 2.2MHz

Applications/Uses

  • Distributed Supply Regulation
  • General-Purpose Point-of-Load
  • Wall Transformer Regulation
Part Number VIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Preset VOUT
(V)
Output Adjust. Method IOUT1
(A)
Switch Type Synchronous Switching Power Good Signal DC-DC Outputs Oper. Freq.
(kHz)
Design Tools Package/Pins Budgetary
Price
min max min max max See Notes
MAX17232 NEW! 3.5 36 1 10
3.3
5
Preset
Resistor
10 External Yes Yes 2 1000 EE-Sim
TQFN/28
$2.59 @1k
MAX17233 NEW! 2200
TQFN/28
See All Step-Down Switching Regulators (321)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


MAX17233EVKIT: Evaluation Kit for the MAX17232 / MAX17233

Quality and Environmental Data

Request Reliability Report for: MAX17233 
Lead-Free Package Tin (Sn) Whisker Reports

Tools & Models

Design & Simulate MAX17233

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