MAX17232 Datasheet, PDF (1/24 Pages) Maxim Integrated Products – Eliminates External Components and Reduces Total Cost

MAX17232/MAX17233
EVALUATION KIT AVAILABLE
3.5V–36V, 2.2MHz, Synchronous Dual Buck
Controller with 20µA Quiescent Current
General 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.
Applications
●● Distributed Supply Regulation
●● Wall Transformer Regulation
●● General-Purpose Point-of-Load
Benefits and 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
Ordering Information and Selector Guide appears at end of
data sheet.
19-8366; Rev 0; 2/16