Details, datasheet, quote on part number: R1212D002A
PartR1212D002A
Category
DescriptionStep-up Dc/dc Contoller
CompanyRicoh Corporation
DatasheetDownload R1212D002A datasheet
  

 

Features, Applications

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....................................................... 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.................... 1.4MHz, 300kHz Maximum Duty Cycle/Soft-start time............................. Adjustable with external capacitors (If internal limit is set by version, Typ. 90% or Typ. 91.5%) 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

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

In the R1212D Series, the oscillator frequency, UVLO detector threshold, and with/without internal limit of maximum duty cycle can be selected at the user's request. The selection can be made with designating the part number as shown below;

a Code 2C b Oscillator Frequency Typ. 700kHz Typ. 1.4MHz Typ. 700kHz Typ. 300kHz Typ. 700kHz Typ. 300kHz b

Contents UVLO Detector Threshold Typ. 1.9V Typ. 1.9V Typ. 2.1V Typ. 2.1V Typ. 2.8V Typ. 2.8V Internal Maximum Duty Limit No Typ. 90% Typ. 91.5% Typ. 90% Typ. 91.5%

Designation of composition of pin plating -F: Lead free plating

Pin No Symbol EXT GND DTC DELAY VFB VREFOUT AMPOUT VIN Ground Pin for Setting Maximum Duty Cycle and Soft start time Pin for External Capacitor (for Setting Output Delay of Protection) Feedback Pin for monitoring Output Voltage Reference Voltage Output Pin Amplifier Output Pin Power Supply Pin for the IC Description External FET Drive Pin (CMOS Output)

Symbol VIN VEXT VDLY VREFOUT VAMP VDTC VFB IAMP IROUT IEXT PD Topt Tstg VIN Pin Voltage

Item EXT Pin Output Voltage DELAY Pin Voltage VREFOUT Pin Voltage AMPOUT Pin Voltage DTC Pin Voltage VFB Pin Voltage AMPOUT Pin Current VREFOUT Pin Current EXT Pin Inductor Drive Output Current Power Dissipation (SON-8)*

Operating Temperature Range Storage Temperature Range
1) For Power Dissipation, please refer to PACKAGE INFORMATION to be described.

 

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