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R1212 Series
PWM Step-up DCDC Controller

Product Specifications

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).

FEATURES

Input Voltage Range (Maximum Rating) 2.2 V to 5.5 V (6.5 V)
Supply Current Typ. 400 µA (300 kHz)
Typ. 600 µA (700 kHz)
Typ. 900 µA (1.4 MHz)
Oscillator Frequency Typ. 300 kHz, 700 kHz, 1.4 MHz
Built-in Latch-type Protection Function Output Delay Time can be set with an external capacitor
Maximum Duty Cycle Adjustable with external capacitors
(If internal limit is set by version, Typ. 90% or Typ. 91.5%)
Soft-start Time Adjustable with external capacitors
Feedback Voltage 1.0 V
Feedback Voltage Accuracy ±1.5%
Temperature-Drift Coefficient of Feedback Voltage Typ. ±150 ppm/°C
UVLO Detector Threshold Typ. 1.9 V, 2.1 V, 2.8 V
Package SON-8

APPLICATION INFORMATION

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

TYPICAL CHARACTERISTICS

R1212D100A Efficiency vs. Output Current

PIN DESCRIPTION

SON-82.9 mm × 3.0 mm

SON-8

1 EXT
2 GND
3 DTC
4 DELAY
5 VFB
6 VREFOUT
7 AMPOUT
8 VIN

*) The tab suspension leads are substrate level (GND).


R1212 Series for Consumer

APPLICATIONS

  • Constant Voltage Power Source for portable equipment
  • Constant Voltage Power Source for LCD and CCD

SELECTION GUIDE

The oscillator frequency, UVLO detector threshold, and oscillator maximum duty cycle internal limit for the ICs can be selected at the user’s request.

Product Name   Package Quantity per Reel
R1212D10xx-TR-FE Consumter SON-8 3,000
  • xx … The combination of the oscillator frequency, oscillator maximum duty cycle internal limit, and UVLO detect voltage can be designated.
Code Oscillator Frequency UVLO Detector Threshold Internal Maximum Duty Limit
0A Typ. 700 kHz Typ. 1.9 V No
0B Typ. 1.4 MHz Typ. 1.9 V No
1A Typ. 700 kHz Typ. 2.1 V Typ. 90%
1C Typ. 300 kHz Typ. 2.1 V Typ. 91.5%
2A Typ. 700 kHz Typ. 2.8 V Typ. 90%
2C Typ. 300 kHz Typ. 2.8 V Typ. 91.5%

DOCUMENT/CONTACT

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Package *1 Marking Reliability *2
SON-8 R1212D R1212D (-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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