R1211 Series

PWM Step-up DC/DC Controller

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Description

The R1211 Series are low supply current CMOS-based PWM step-up DC/DC controllers. R1211 does not include an internal output transistor. By simply using a power MOS, an inductor, a diode, resistors, and capacitors as external components, a high-efficiency step-up DC/DC converter can be easily configured. R1211 is available in two versions: B/D versions with an internal phase compensation and A/C versions with adjustable phase compensation with an external capacitor and resistor.

The oscillator frequency can be selected from 300kHz or 700kHz. The soft start function built into the controller is set to Typ. 10.5ms for 300kHz and to Typ. 9ms for 700kHz. The latch type protection circuit embedded into the device latches the external driver in the "OFF" state when the oscillator maximum duty cycle continues for a predetermined period of time setting by an external capacitor.

Spec

	Consumer	Automotive
Input Voltage Range	2.5 V to 6 V (6.5 V)
Operating Temperature Range	-40°C to 85°C (125°C)
Supply Current	Typ. 600 µA
Standby Current	Typ. 0 µA
Output Voltage Temperature Coefficient	Typ. ±150ppm/°C
Feedback Voltage	1.0 V
Feedback Voltage Accuracy	±1.5%
Oscillator Frequency	Typ. 300 kHz, Typ. 700 kHz
Maximum Duty Cycle	Typ. 90%
Package	SON-6, SOT-23-6W	SOT-23-6W

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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	Package	Marking	Reliability
R1211D002x-TR-FE	SON-6	R1211D	R1211D-FE
R1211N002x-TR-FE	SOT-23-6W	R1211N	R1211N-FE
R1211N002x-TR-AE	SOT-23-6W	R1211N	R1211N-AE

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