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)
SM8172A.pdf