R1223N152A RICOH [RICOH electronics devices division], R1223N152A Datasheet

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R1223N152A

Manufacturer Part Number
R1223N152A
Description
PWM/VFM Step-down DC/DC Converter
Manufacturer
RICOH [RICOH electronics devices division]
Datasheet
1.R1223N152A.pdf (19 pages)
n n n n OUTLINE
n n n n FEATURES
n n n n APPLICATIONS
Rev. 1.11
12345
a soft-start circuit, a protection circuit, a PWM/VFM alternative circuit, a chip enable circuit, and resistors for
voltage detection. A low ripple, high efficiency step-down DC/DC converter can be easily composed of this IC
with only four external components, or a power-transistor, an inductor, a diode and a capacitor.
into the VFM oscillator from PWM oscillator, therefore the efficiency at small load current is improved. The
R1223N XXXB type, which is without a PWM/VFM alternative circuit, is also available.
two types of protection function. One is latch-type protection circuit, and it works to latch an external Power
MOSFET 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. The other is Reset-type protection circuit, and it works to
restart the operation with soft-start and repeat this operation until maximum duty cycle condition is released.
Either of these protection circuits can be designated by users’ request.
l Power source for hand-held communication equipment, cameras, video instruments such as VCRs,
l Power source for battery-powered equipment.
l Power source for household electrical appliances.
process.
l Standby Current · · · · · · · · · · · · · · · · ·TYP. 0µA
l High Accuracy Output Voltage · · · · · · · · · ·±2.0%
l Low Temperature-Drift Coefficient of Output Voltage · · · · · TYP. ±100ppm/°C
With a PWM/VFM alternative circuit, when the load current is small, the operation is automatically switching
If the term of maximum duty cycle keeps on a certain time, the embedded protection circuit works. There are
l Range of Input Voltage · · · · · · · · · · · · ·2.3V~13.2V
l Built-in Soft-start Function and Two choices of Protection Function (Latch-type or Reset type)
l Two choices of Oscillator Frequency · · · · · ·300kHz, 500kHz
l High Efficiency · · · · · · · · · · · · · · · · · ·TYP. 90%
l Output Voltage · · · · · · · · · · · · · · · · · Stepwise Setting with a step of 0.1V
The R1223N Series are PWM step-down DC/DC Converter controllers with low supply current by CMOS
Each of these ICs consists of an oscillator, a PWM control circuit, a reference voltage unit, an error amplifier,
camcorders.
- 1 -
PWM/VFM step-down DC/DC Converter
R1223N Series
in the range of 1.5V ~ 5.0V
12345
‘99.12.8

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R1223N152A Summary of contents

Page 1

OUTLINE The R1223N Series are PWM step-down DC/DC Converter controllers with low supply current by CMOS process. Each of these ICs consists of an oscillator, a PWM control circuit, a reference voltage unit, an error ...

Page 2

BLOCK DIAGRAM V IN EXT PWM/VFM CONTROL GND SELECTION GUIDE In the R1223N Series, the output voltage, the oscillator frequency, the optional function, and the taping type for the ICs can be ...

Page 3

PIN CONFIGURATION n PIN DESCRIPTION Pin No. Symbol GND 3 V OUT 4 EXT ABSOLUTE MAXIMUM RATINGS Symbol V V Supply Voltage EXT ...

Page 4

ELECTRICAL CHARACTERISTICS lR1223N**2A(,C,E,G) Output Voltage : Vo Symbol Item V Operating Input Voltage IN V Step-down Output Voltage OUT DV / Step-down Output Voltage OUT DT Temperature Coefficient fosc Oscillator Frequency Df / Oscillator Frequency OSC ...

Page 5

Output Voltage : Vo Symbol Item V Operating Input Voltage IN V Step-down Output Voltage OUT DV / Step-down Output Voltage OUT DT Temperature Coefficient fosc Oscillator Frequency Df / Oscillator Frequency OSC DT Temperature Coefficient I Supply Current1 ...

Page 6

TEST CIRCUITS A) PMOS ...

Page 7

TYPICAL APPLICATIONS AND APPLICATION HINTS PMOS CONTROL PMOS : HAT1020R(Hitachi), Si3443DV(Siliconix) SD1 : RB491D (Rohm 10mF52(Tantalum Type) IN When you use these ICs, consider the following issues; l ...

Page 8

Use an inductor with appropriate inductance. l Use a diode of a Schottky type with high switching speed, and also pay attention to its current capacity not use this IC under the condition The performance ...

Page 9

Equation 2 tonc=T´ OUT When ton<tonc, the mode is the discontinuous mode, and when ton=tonc, the mode is the continuous mode. n OUTPUT CURRENT AND SELECTION OF EXTERNAL COMPONENTS When LxTr is ON: (Wherein, Ripple Current P-P ...

Page 10

TYPICAL CHARACTERISTICS 1) Output Voltage vs. Output Current R1223N332H 3.400 3.380 3.360 3.340 3.320 3.300 3.280 3.260 3.240 3.220 3.200 1E-05 0.0001 0.001 0.01 Output Current IOUT(A) 2) Efficiency vs. Output Current R1223N332A (VIN=4.5V) 100 ...

Page 11

R1223N332C (VIN=4.5V) 100 0 Output Current IOUT(mA) R1223N502A (VIN=6.0V) 100 0 Output Current IOUT(mA) R1223N502B (VIN=6.0V) ...

Page 12

R1223N502C (VIN=6.0V) 100 0 Output Current IOUT(mA) 3) Ripple Voltage vs. Output Current R1223N332A 200 180 VIN4.5V 160 VIN8V 140 VIN12V 120 100 ...

Page 13

... L=27uH 600 500 400 300 200 100 L=27uH 1.53 1.52 1.51 1.50 1.49 1.48 1. R1223N502C L=27uH VIN6V VIN8V VIN12V 10 100 1000 Output Current IOUT(mA) R1223N152A L=27uH Input Voltage VIN(V) L=27uH R1223N152A Input Voltage VIN(V) 12345 ...

Page 14

R1223N332B 3.36 3.34 3.32 3.30 3.28 3.26 3. Input Voltage V 6) Output Voltage vs. Temperature R1223N332H 3.33 3.32 3.31 3.30 3.29 3.28 3.27 -50 0 Temperature Topt 7) Oscillator Frequency vs. Temperature R1223N252A 360 340 320 300 ...

Page 15

Supply Current vs. Temperature R1223N332G 100 -50 0 Temperature Topt 9) Soft-start time vs. Temperature R1223N252A -50 0 Temperature Topt 10) Delay Time for Latch-type ...

Page 16

Delay Time for Reset-type Protection vs. Temperature R1223N332G -50 0 Temperature Topt 12) EXT "H" Output Current vs. Temperature R1223N332B -50 0 Temperature Topt ...

Page 17

Load Transient Response R1223N332A 3.4 3.3 3.2 3.1 3 2.9 2.8 2.7 2.6 2.5 2.4 0 0.0002 0.0004 0.0006 0.0008 0.001 Time (sec) R1223N332B 3.4 3.3 3.2 3.1 3 2.9 2.8 2.7 2.6 2.5 2.4 0 0.0002 0.0004 0.0006 ...

Page 18

R1223N332D 3.4 3.3 3.2 3.1 3 2.9 2.8 2.7 2.6 2.5 2.4 0 0.0002 0.0004 0.0006 0.0008 0.001 Time (sec) 15) Turn-on Waveform R1223N332A (VIN=10V,IOUT=0mA) 3.5 3 2.5 2 1.5 1 0.5 0 -0.5 -1 -1.5 -2 -2.5 -3 -3.5 ...

Page 19

R1223N332A (VIN=10V,IOUT=100mA) 3.5 3 2.5 2 1.5 1 0.5 0 -0.5 -1 -1.5 -2 -2.5 -3 -3.5 -0.01 0 Time (sec) R1223N332B (VIN=10V,IOUT=100mA) 3.5 3 2.5 2 1.5 1 0.5 0 -0.5 -1 -1.5 -2 -2.5 -3 -3.5 -0.01 0 ...

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