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About RICOH Electronic Devices
R1210 Series
8V Input PWM Step-up DCDC Converter
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Product Specifications
The R1210 Series are low supply current, CMOS-based PWM step-up DC/DC converters. By simply using an inductor, a diode, and a capacitor as external components, a high-efficiency step-up DC/DC converter can be easily configured. The xx1 version with an internal output transistor and the xx2 version with an external transistor are available. The oscillator frequency can be selected from 100kHz or 180kHz. The xx1A version is also available, which contains a basic frequency changeover circuit that switches the oscillator frequency from 100kHz to 35kHz when output load is reduced. R1210 also has a function that detects drastic changes in output voltage and reduces the amount of overshoot/undershoot by switching control mode.
FEATURES
| Input Voltage Range (Maximum Rating) | Max. 8.0 V (9.0 V) |
|---|---|
| Standby Current | Max. 0.5 µA |
| Temperature-Drift Coefficient of Output Voltage | Typ. ±100 ppm/°C |
| Output Voltage Range | 2.2 V to 3.5 V (0.1V steps) (R1210Nxx1A) 2.2 V to 6.0 V (0.1V steps) (R1210NxxxC/D) |
| Oscillator Frequency | 100 kHz (R1210Nxx1A, R1210NxxxC) 180 kHz (R1210NxxxD) |
| Output Voltage Accuracy | ±2.5% |
| Package | SOT-23-5 |
| Efficiency | Typ. 88% (VIN=Set Output Voltage×0.6 [V], IOUT=10mA) |
| Start-up Voltage | Max. 0.9 V (R1210Nxx1x), Max. 0.8 V (R1210Nxx2x) |
| Basic Frequency change-over circuit (only for xx1A type) | from Typ. 100 kHz to 35 kHz |
APPLICATION INFORMATION
R1210Nxx1x
L: 100µH, CL: 22µFx2
R1210Nxx2x
L: 27µH, CL: 47µF×2, Rb: 300Ω, Cb: 0.01µF
TYPICAL CHARACTERISTICS
R1210N301C Efficiency vs. Output Current
R1210N302C Efficiency vs. Output Current
PIN DESCRIPTION
SOT-23-5
2.9 mm × 2.8 mm| 1 | CE |
| 2 | VOUT |
| 3 | NC |
| 4 | GND |
| 5 | Lx or EXT |
R1210 Series for Consumer
APPLICATIONS
- Power source for battery-powered equipment
- Power source for portable communication appliances, cameras, VCRs
- Power source for appliances of which require higher voltage than battery voltage
SELECTION GUIDE
The OVP threshold voltage, and the package for the ICs can be selected at the user's request.
| Product Name | Package | Quantity per Reel | |
|---|---|---|---|
| R1210Nxx#$-TR-FE |  |
SOT-23-5 | 3,000 |
- xx … Specify the output voltage within the range of 2.2V (22) to 6.0V (60) in 0.1V steps. (up to 3.5V (35) for xx1A)
- # … 1: Internal output transistor type
2: External transistor type - $ … A: Oscillator frequency 100 kHz, built-in basic frequency change-over circuit
C: Oscillator frequency 100 kHz
D: Oscillator frequency 180 kHz
(R1210Nxx2A-TR-FE is not available.)
DOCUMENT/CONTACT
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| Package *1 | Marking | Reliability *2 |
|---|---|---|
| SOT-23-5 | R1210N | R1210N (-FE) |
*1: The package file includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and land pattern (foot pattern).
*2: Reliability file includes a reliability test report and a reflow profile.
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