General Description
The MAX736/MAX737/MAX739/MAX759EWE are CMOS, inverting, switch-mode regulators with an internal power MOSFET. Guaranteed output power for the MAX739 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 1uA. 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/MAX737/MAX739 have fixed outputs of-12V, -15V, and-5V respectively. The MAX759EWE is adjustable from OVto-15V. Output voltages beyond -15V require a transformer.
These inverting DC-DC converters employ a high-perfor-mance, 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.
FEATURES
◆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)
◆1uA Shutdown Mode(MAX739)
◆+4V to +15V Input Voltage Range
◆165kHz Current-Mode PWM-Low Noise and Jitter
◆Undervoltage Lockout and Soft-Start Protection
APPLICATIONS
◆Low-Noise Analog Signal Processing Circuits
◆LCD Bias Supplies
◆Power Supplies for ECL
◆Board-Level DC-DC Conversion
◆Battery-Powered Equipment
◆Computer Peripherals
(Picture: Pinout)
