MAX737

PRODUCTION

-5V, -12V, -15V, and Adjustable Inverting Current-Mode PWM Regulators

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Overview

  • Pre-Set -5V, -12V, -15V or Adjustable Outputs
  • Convert Positive Voltages to Negative
  • 1.25W Guaranteed Output Power
  • 83% Typical Efficiency
  • 1.7mA Quiescent Current (MAX739)
  • 1µA Shutdown Mode (MAX739)
  • +4V to +15V Input Voltage Range
  • 165kHz Current-Mode PWM - Low Noise and Jitter
  • Undervoltage Lockout and Soft-Start Protection

The MAX736/MAX737/MAX739/!MAX759 are CMOS, in­verting, switch-mode regulators with an internal power MOSFET. Guaranteed output power for the MAX.739 is 1.25W when powered from a +4.5V input, and 1.5W when powered from +6V. Quiescent supply current for the MAX739 is typically 1. 7mA, and a shutdown mode reduces this to 1µ.A. These power-conserving features, along with high efficiency and an application circuit that lends itself to miniaturization, make these parts excel in a broad range of on-card and portable equipment applications.

The MAX736/MAX/737/MAX739 have fixed outputs of -12\/, -15V, and -5V respectively. The MAX759 is adjustable from 0V to -1 SV. Output voltages beyond -15V require a transformer.

These inverting DC-DC converters employ a high-perfor­mance, current-mode, pulse-width modulation (PWM) con­trol scheme to provide tight output voltage regulation and low noise. The fixed-frequency oscillator is factory-trimmed to 165kHz, allowing easy noise filtering. The devices are production tested in an actual application circuit, and output accuracy is guaranteed at ±5% over all specified conditions of line, load, and temperature.

The input voltage range is +4V to + 15V. For similar devices with smaller packages and an input voltage range of +4V to + 11V, refer to the MAX735/MAX755 data sheet.

APPLICATIONS

  • Low-Noise Analog Signal Processing Circuits
  • LCD Bias Supplies
  • Power Supplies for ECL
  • Board-Level DC-DC Conversion
  • Battery-Powered Equipment
  • Computer Peripherals

MAX737
-5V, -12V, -15V, and Adjustable Inverting Current-Mode PWM Regulators
MAX736, MAX737, MAX739, MAX759: Pin Configuration
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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Switching Regulators & Controllers 2
MAX635 PRODUCTION Preset/Adjustable Output CMOS Inverting Switching Regulators
MAX735 PRODUCTION -5V/Adjustable, Negative-Output, Inverting, Current-Mode PWAf Regulators
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Evaluation Kits

MAX739EVKIT

Evaluation Kit for the MAX739

Product Details

The MAX739 evaluation kit (EV kit) permits evaluation of Maxim's current-mode, pulse-width modulation (PWM), inverting DC-DC converters.

MAX759LCDEVKIT

Evaluation Kit for the MAX759

Product Details

The MAX759 LCD power supply evaluation kit (EV kit) is a special application circuit that uses the MAX759 inverting DC-DC converter to generate the variable negative voltage needed by liquid crystal displays (LCDs.)

MAX739EVKIT
Evaluation Kit for the MAX739
MAX759LCDEVKIT
Evaluation Kit for the MAX759

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