Power supply IC 5V dual output 3.3V and 0.8-1.8V
Discontinued Products are limited to existing inventory.
The SM8172A is a 2-output power supply IC that incorporates a step-down DC/DC converter and series regulator with built-in reset circuit. The DC/DC converter is a PWM-type synchronous rectifier. The SM8172A has soft start, over-current detection, supply under-voltage lockout, and thermal shutdown circuits built-in, making it ideal as a supply voltage source IC for large-scale LSIs that operate from a 5V supply.
Key Features
  • Input voltage range: 4.5 to 5.5V
  • Standby current: 0.01µA (typ)
  • Series regulator
    • Feedback-type current limiter to reduce output current when outputs are short-circuit
    • Output voltage: 3.3V (available for optional setting from 2.1 to 3.6V by 0.1V-step)
    • Maximum output current: 450mA
    • Voltage accuracy: ±2% (Vin=5.0V, Ta=25°C
  • DC/DC converter
    • Current-mode operation for excellent transient response
    • Output voltage: 0.8 to 1.8V (typ, selectable by external resistor)
    • Maximum output current: 900mA
    • Operating frequency: 2 MHz (typ)
    • Voltage accuracy: ±2% (FB pin, VIN = 5.0V, Ta = 25°C, Scout=1.0V
  • Reset circuit built-in
    • Reset detection voltage: 3.7V (typ) (available for optional setting from 3.2 to 4.2V by 0.1V step)
    • Reset return delay time: 65ms (typ) (50ms, 32ms, 16ms, and 8ms selectable with option)
  • Multiple protection circuits built-in
    • Startup soft start circuit
    • Over-temperature thermal shutdown (TSD) circuit
    • Supply under-voltage lockout (UVLO) circuit
  • Package: 10-pin SON
Typical Applications
  • ODD
  • DVD player/recorder
  • Next-generation DVD player/recorder
  • Electronic equipment
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