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參數資料
| 型號： | R1212D102C |
| 廠商： | Ricoh Co., Ltd. |
| 英文描述： | STEP-UP DC/DC CONTOLLER |
| 中文描述： | 升壓型DC /直流位指示 |
| 文件頁數： | 1/41頁 |
| 文件大小： | 690K |
| 代理商： | R1212D102C |
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R1212D SERIES
STEP-UP DC/DC CONTOLLER
NO.EA-109-0607
OUTLINE
1
The R1212D Series are CMOS-based PWM step-up DC/DC converter controllers with low supply current.
Each of the R1212D Series consists of an oscillator, a PWM comparator circuit, a reference voltage unit, an
error amplifier, a reference current unit, a protection circuit, and an under voltage lockout (UVLO) circuit. A low
ripple, high efficiency step-up DC/DC converter can be composed of this IC with some external components, or
an inductor, a diode, a power MOSFET, divider resisters, and capacitors.
Maximum duty cycle and the soft start time are easily adjustable with external resistors and capacitors. In
terms of maximum duty cycle, with or without internal limit can be set by mask options. As for the protection
circuit, after the soft-starting time, if the maximum duty cycle is continued for a certain period, the R1212D Series
latch the external driver with its off state, or the latch-type protection circuit works.
The delay time for latch the state can be set with an external capacitor.
To release the protection circuit, restart with power-on (Voltage supplier is equal or less than UVLO detector
threshold level).
FEATURES
Input Voltage Range .......................................................2.2V to 5.5V
Built-in Latch-type Protection Function (Output Delay Time can be set with an external capacitor)
Two Options of Basic Oscillator Frequency....................700kHz, 1.4MHz, 300kHz
Maximum Duty Cycle/Soft-start time .............................Adjustable with external capacitors
High Reference Voltage Accuracy ..................................±1.5%
U.V.L.O. Threshold level.................................................Typ.1.9V/2.1V/2.8V by mask option
Small Temperature Coefficient of Reference Voltage ...Typ.±150ppm/°C
Package..........................................................................SON-8 ( t
=
Max. 0.9mm )
APPLICATIONS
(If internal limit is set by version, Typ. 90% or Typ. 91.5%)
Constant Voltage Power Source for portable equipment.
Constant Voltage Power Source for LCD and CCD.
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