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DC/DC CONVERTER. R1232D Datasheet

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DC/DC CONVERTER. R1232D Datasheet






R1232D CONVERTER. Datasheet pdf. Equivalent




R1232D CONVERTER. Datasheet pdf. Equivalent





Part

R1232D

Description

PWM STEP-DOWN DC/DC CONVERTER



Feature


R1232D SERIES PWM STEP-DOWN DC/DC CONVER TER WITH SYNCHRONOUS RECTIFIER NO.EA-12 9-130510 OUTLINE The R1232D Series are CMOS-based PWM step-down DC/DC converte rs with synchronous rectifier, low supp ly current. As an output capacitor, a 1 0μF or more ceramic capacitor can be u sed with the R1232D. Each of these ICs consists of an oscillator, a PWM contro l circuit, a voltag.
Manufacture

RICOH electronics

Datasheet
Download R1232D Datasheet


RICOH electronics R1232D

R1232D; e reference unit, an error amplifier, a soft-start circuit, protection circuits , a protection against miss operation u nder low voltage (UVLO), a chip enable circuit, a synchronous rectifier, Nch. driver transistor, and so on. A low rip ple, high efficiency step-down DC/DC co nverter can be easily composed of this IC with only a few kinds of external co mponents, or an in.


RICOH electronics R1232D

ductor and capacitors. (As for R1232D001 x type, divider resistors are also nece ssary.) In terms of the output voltage, it is fixed internally in the R1232Dxx 1x types. While in the R1232D001x types , the output voltage is adjustable with external divider resist .


RICOH electronics R1232D

.

Part

R1232D

Description

PWM STEP-DOWN DC/DC CONVERTER



Feature


R1232D SERIES PWM STEP-DOWN DC/DC CONVER TER WITH SYNCHRONOUS RECTIFIER NO.EA-12 9-130510 OUTLINE The R1232D Series are CMOS-based PWM step-down DC/DC converte rs with synchronous rectifier, low supp ly current. As an output capacitor, a 1 0μF or more ceramic capacitor can be u sed with the R1232D. Each of these ICs consists of an oscillator, a PWM contro l circuit, a voltag.
Manufacture

RICOH electronics

Datasheet
Download R1232D Datasheet




 R1232D
R1232D SERIES
PWM STEP-DOWN DC/DC CONVERTER WITH SYNCHRONOUS RECTIFIER
NO.EA-129-130510
OUTLINE
The R1232D Series are CMOS-based PWM step-down DC/DC converters with synchronous rectifier, low
supply current. As an output capacitor, a 10μF or more ceramic capacitor can be used with the R1232D.
Each of these ICs consists of an oscillator, a PWM control circuit, a voltage reference unit, an error amplifier, a
soft-start circuit, protection circuits, a protection against miss operation under low voltage (UVLO), a chip enable
circuit, a synchronous rectifier, Nch. driver transistor, and so on. A low ripple, high efficiency step-down DC/DC
converter can be easily composed of this IC with only a few kinds of external components, or an inductor and
capacitors. (As for R1232D001x type, divider resistors are also necessary.) In terms of the output voltage, it is
fixed internally in the R1232Dxx1x types. While in the R1232D001x types, the output voltage is adjustable with
external divider resistors.
As protection circuits, current limit circuit which limits peak current of LX at each clock cycle, and latch type
protection circuit exist. The latch protection works if the term of the over-current condition keeps on a certain time.
Latch-type protection circuit works to latch an internal driver with keeping it disable. To release the condition of
protection, after disable this IC with a chip enable circuit, enable it again, or restart this IC with power-on or make
the supply voltage at UVLO detector threshold level or lower than UVLO.
FEATURES
Two choices of Oscillator Frequency ............................ 1MHz, 2.25MHz
(Small inductors can be used. 4.7μH for 1MHz/2.2μH for 2.25MHz)
Built-in Driver ON Resistance ....................................... P-channel 0.2Ω (at VIN=5.0V)
Built-in Soft-start Function............................................. Typ. 1.0ms (fosc=1MHz type)
Output Voltage .............................................................. 0.9V to 3.3V (R1232Dxx1x Type)
0.8V to VIN (R1232D001x Type)
High Accuracy Output Voltage ......................................±2.0%
Built-in Current Limit Circuit .......................................... Typ. 1.4A
Package ........................................................................SON-8 (t=0.9mm)
APPLICATIONS
Power source for portable equipment such as PDA, DSC, Notebook PC.
Power source for HDD
1




 R1232D
R1232D
BLOCK DIAGRAMS
R1232Dxx1A/B
VDD
3
AGND
7
VIN 2
LX 8
Current Limit
Slope
Compensation
Phase
Compensation
Output
Contorol
QR
S PWM
Comparator
Vref
Error
Amplifer
Oscillator
Soft Start
1
PGND
TEST Circuit
6
TEST GND Fixed
UVLO
Chip Enable
5 VOUT
4 CE
“H” Active
R1232D001C/D
VDD
3
AGND
7
VIN 2
LX 8
Current Limit
Slope
Compensation
Phase
Compensation
Output
Contorol
QR
S PWM
Comparator
Error
Vref
Amplifer
Oscillator
Soft Start
1
PGND
TEST Circuit
6
TEST GND Fixed
UVLO
Chip Enable
5 VFB
4 CE
“H” Active
2




 R1232D
R1232D
SELECTION GUIDE
In the R1232D Series, the output voltage, the oscillator frequency and the output voltage adjustment for the
ICs can be selected at the user’s request.
Product Name
R1232Dxx1-TR-FE
Package
SON-8
Quantity per Reel
3,000 pcs
Pb Free
Yes
Halogen Free
Yes
xx: The output voltage can be designated in the range from 0.9 V(09) to 3.3V(33) in 0.1V steps.
(For externally adjustable output voltage type, (00).)
: The oscillator frequency and the output voltage adjustment are options as follows.
Code
A
B
Oscillator frequency
1MHz
2.25MHz
Output voltage
adjustment
No
No
C 1MHz
D 2.25MHz
Yes
Yes
3






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