R1212 Series
PWM Step-up DC/DC Controller
Download Datasheet
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Description
The R1212 Series are low supply current CMOS-based PWM step-up DC/DC controllers. R1212 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. The oscillator maximum duty cycle and soft start time as well as phase compensation can be set with external resistors and capacitor (The oscillator maximum duty cycle can be selected from the type with/without internal limit.)
The oscillator frequency can be selected from 300kHz, 700kHz, or 1.4MHz. 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. R1212 also includes an under-voltage lockout circuit (UVLO).
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Spec
Consumer Input Voltage Range 2.2 V to 5.5 V (6.5 V) Operating Temperature Range -40°C to 85°C (125°C) Supply Current Typ. 400 µA (300 kHz)
Typ. 600 µA (700 kHz)
Typ. 900 µA (1.4 MHz)Feedback Voltage 1.0 V Feedback Voltage Accuracy ±15 mV Feedback Voltage Temperature Coefficient Typ. ±150 ppm/°C Oscillator Frequency Typ. 300 kHz, 700 kHz, 1.4 MHz Maximum Duty Cycle Adjustable with external capacitors
(If internal limit is set by version, Typ. 90% or Typ. 91.5%)Package SON-8 Protections / Functions
TSD ILX OCP OVP UVLO OVLO Reverse Shutdown Soft Start SSCG PGOOD Auto Discharge Anti-ringing Sequencing Max Duty Ext. Phase LED Adjust 
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Technical
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Typical Application
L: 10µH(A), 4.7µH(B), 22µH(C), C1: 2.2µF, C2: 1µF, C3: 15µF, C4=C5: 1000pF(A), 680pF(B), 1500pF(C), C6: 0.1µF, C7: 0.1µF, R3: 1kΩ, R4: 4.7kΩ, R5: 240kΩ, R6: 300kΩ
Output voltage set value 5V…R1: 120kΩ, R2: 30kΩ, 10V…R1: 180kΩ, R2: 20kΩ, 15V…R1: 140kΩ, R2: 10kΩ -
R1212D100A Efficiency vs. Output Current
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Related Links
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Quality &
Packages- 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.
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Sample / Buy
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Buy Online
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Buy, Request for Samples, Request for Information Materials
Authorized Distributors
Please contact your local distributors for any sales-related inquiry such as price, stock, delivery, etc.
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Download Datasheet
Functional Description
| 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 |