R1232 Series

PWM Step-down DC/DC Converter with Synchronous Rectifier

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Description

The R1232 Series are low supply current CMOS-based PWM step-down DC/DC converters with synchronous rectifier. R1232 includes a soft start circuit, under-voltage lockout circuit (UVLO) and latch type protection circuit. By simply using an inductor, a capacitor, and (resistors) as external components, a high-efficiency step-down DC/DC converter can be easily configured. R1232 comes in two types: R1232Dxx1A/B with internally fixed output voltage and R1232D001C/D with adjustable output voltage with external resistors.

Spec

	Consumer
Input Voltage Range	2.6 V to 5.5 V (6.5 V)
Operating Temperature Range	-40°C to 85°C (125°C)
Supply Current	Typ. 140 µA (1 MHz), 240 µA (2.25 MHz) (Non-switching)
Standby Current	Typ. 0 µA (CE = "L")
Output Voltage Range	Internally Fixed Ver.: 0.9 V to 3.3 V Externally Adjustable Ver.: 0.8 V to VIN (Feedback Voltage: 0.8V)
Output Voltage Accuracy	±2% (Ta = 25°C)
Feedback Voltage Accuracy	±16 mV
Output Current	1 A
Oscillator Frequency	Typ. 1 MHz, 2.25 MHz
Maximum Duty Cycle	Min. 100%
Package	SON-8

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TSD	ILX	OCP	OVP	UVLO	OVLO	Reverse	Shutdown	Soft Start	SSCG	PGOOD	Auto Discharge	Anti-ringing	Sequencing	Max Duty	Ext. Phase	LED Adjust

Functional Description

Quality &
Packages

Product Name	Compatibility	Package	Marking	Reliability
R1232Dxx1x-TR-FE		SON-8	R1232D	R1232D-FE

Refer to the datasheets for the details on the product.
The package file or the datasheet includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and recommended land pattern.

TSD	Thermal Shutdown Function
ILX	LX Current Limit Function
OCP	Overcurrent Protection
OVP	Overvoltage Protection
UVLO	Undervoltage Lockout Protection
OVLO	Overvoltage Lockout Protection
Reverse	Reverse Current Protection Circuit
Shutdown	Shutdown Function
Soft Start	Soft Start Function
SSCG	Spread Spectrum Clock Generator Function
PGOOD	Power Good Output
Auto Discharge	Auto Discharge Function
Anti-ringing	Anti-ringing Switch Function
Sequencing	Start-up Sequencing Control
Max Duty	Maximum Duty Cycle
Ext. Phase	Externally Adjustable Phase Compensation
LED Adjust	LED High-speed Dimming Control