R1223 Series

13.2V Input PWM/VFM Step-down DC/DC Controller

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Description

The R1223 Series are CMOS-based PWM/VFM step-down DC/DC controller with an external output transistor. By simply using a power transistor, an inductor, a diode, and capacitors as external components, a high-efficiency step-down DC/DC converter can be easily configured. The PWM/VFM alternative circuit automatically switches to VFM control in the smaller output current range and provides high efficiency even in the smaller output current range. The version with fixed PWM control is available. The current limit protection circuit can be selected from reset type or latch type.

Spec

	Consumer
Input Voltage Range	2.3 V to 13.2 V (15.0 V)
Operating Temperature Range	-40°C to 85°C (125°C)
Supply Current	Typ. 100 µA (R1223Nxx2A/C/E/G) Typ. 140 µA (R1223Nxx2B/D/F/H)
Standby Current	Typ. 0 µA
Output Voltage Range	1.5 V to 5.0 V (0.1 V step)
Output Voltage Accuracy	±2% (Ta = 25°C)
Output Voltage Temperature Coefficient	Typ. ±100 ppm/°C
Oscillator Frequency	Typ. 300 kHz, 500 kHz
Efficiency	Typ. 90%
Package	SOT-23-5

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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
R1223Nxx2x-TR-FE		SOT-23-5	R1223N	R1223N-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