R1221N15AA RICOH [RICOH electronics devices division], R1221N15AA Datasheet

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R1221N15AA

Manufacturer Part Number
R1221N15AA
Description
Step-down DC/DC Converter with Voltage Detector
Manufacturer
RICOH [RICOH electronics devices division]
Datasheet
1.R1221N15AA.pdf (21 pages)
n n n n OUTLINE
n n n n FEATURES
n n n n APPLICATIONS
Rev. 1.11
1 1 1 1 2 2 2 2 3 3 3 3 45
voltage unit, an error amplifier, 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
composed of this IC with only four external components, or a power-transistor, an inductor, a diode and a
capacitor.
from PWM oscillator automatically, therefore the efficiency at small load current is improved.
types of protection function. One is latch-type protection circuit, and it works to latch an external Power MOS 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.
low supply current by CMOS process.
The output voltage of DC/DC converter can be supervised by the built-in voltage detector.
With a PWM/VFM alternative circuit, when the load current is small, the operation turns into the VFM oscillator
And the PWM/VFM alternative circuit is an option, in terms of C version and D version, the circuit is not included.
If the term of maximum duty cycle keeps on a certain time, the embedded protection circuit works. There are two
The R1221N Series are PWM step-down DC/DC Converter controllers embedded with a voltage detector, with
Each step-down DC/DC converter in these ICs consists of an oscillator, a PWM control circuit, a reference
l Wide Range of Input Voltage · · · · · · · · · · · · · 2.3V to 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 Standby Current · · · · · · · · · · · · · · · · · · · · · TYP. 0µA
l Setting Output Voltage · · · · · · · · · · · · · · · · · Stepwise setting with a step of 0.1V in the range of
l High Accuracy Output Voltage · · · · · · · · · · · · · · ±2.0%
l Setting Detector Threshold Voltage · · · · · · · · · · · Stepwise setting with a step of 0.1V in the range of
l High Accuracy Detector Threshold Voltage· · · · · · · ±2.0%
l Low Temperature-Drift Coefficient of Output Voltage · TYP. ±100ppm/°C
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.
camcorders.
45
45
45
- 1 -
Step-down DC/DC Converter with Voltage Detector
R1221N Series
1.5V to 5.0V
1.2V to 4.5V
12345
‘ 99.12.8

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R1221N15AA Summary of contents

Page 1

OUTLINE The R1221N Series are PWM step-down DC/DC Converter controllers embedded with a voltage detector, with low supply current by ...

Page 2

BLOCK DIAGRAM V IN EXT PWM/VFM CONTROL VD OUT GND n SELECTION GUIDE In the R1221N Series, the output voltage, the detector threshold, the oscillator frequency, the optional function, and the taping type for the ICs can be selected ...

Page 3

PIN CONFIGURATION PIN DESCRIPTION Pin No. Symbol 1 EXT 2 VD OUT GND 6 V OUT ABSOLUTE MAXIMUM RATING Symbol V V ...

Page 4

ELECTRICAL CHARACTERISTICS lR1221N***A(C,E,G) Output Voltage : Vo, Detector Threshold : V 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 ...

Page 5

Output Voltage : Vo, Detector Threshold : V 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 / Frequency Temperature OSC DT Coefficient ...

Page 6

TEST CIRCUITS A) PMOS + ...

Page 7

TYPICAL APPLICATIONS AND APPLICATION HINTS PMOS EXT GND CE CONTROL PMOS: HAT1020R (Hitachi), Si3443DV (Siliconix) SD1 : RB491D (Rohm) C :10mF(Tantalum Type) IN When you use these ICs, consider the following ...

Page 8

Use capacitors with a capacity of 22mF or more for V as tantalum capacitors. We recommend you to use capacitors with an allowable voltage which is at least twice as much as setting output voltage. This is because there ...

Page 9

In Equation 1, V OUT change of the current at OFF. When the output current(IOUT) is relatively small, topen<toff as illustrated in the above diagram. In this case, the energy is charged in the inductor during the ...

Page 10

Capacitor As for C , use a capacitor with low ESR(Equivalent Series Resistance) and a capacity of at least 10mF for stable IN operation. C can reduce ripple of Output Voltage, therefore 47mF to 100mF tantalum type is recommended. ...

Page 11

TYPICAL CHARACTERISTCS 1) Output Voltage vs. Output Current R1221N33AH 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 Output Current 2) Efficiency vs. Output Current R1221N33AA(VIN=4.5V) 100 ...

Page 12

R1221N33AC(VIN=4.5V) 100 0 Output Current I R1221N50XA(VIN=6.0V) 100 0 Output Current R1221N50XB(VIN=6.0V) 100 0 ...

Page 13

R1221N50XC(VIN=6.0V) 100 0 Output Current 3) Ripple Voltage vs. Output Current R1221N33AA 200 180 VIN4.5V 160 VIN8V 140 VIN12V 120 100 Output Current R1221N33AB 200 180 ...

Page 14

R1221N33AC 200 180 VIN4.5V 160 VIN8V 140 VIN12V 120 100 Output Current 4) Oscillator Frequency vs. Input Voltage R1221N15XB 600 500 400 300 200 100 Input Voltage 5) Output Voltage ...

Page 15

R1221N33AB 3.36 3.34 3.32 3.30 3.28 3.26 3. Input Voltage 6) Output Voltage vs. Temperature R1221N33AH 3.31 3.30 3.29 3.28 3.27 -50 0 Temperature Topt 7) Detector Threshold vs. Temperature R1221N25XA(VD=2.0V) 2.01 2.00 1.99 1.98 1.97 -50 0 ...

Page 16

R1221N33AB(VD=3.0V) 3.06 3.04 3.02 3.00 2.98 2.96 2.94 -50 0 Temperature Topt 8) Oscillator Frequency vs. Temperature R1221N33AB 600 550 500 450 400 -50 0 Temperature Topt 9) Supply Current vs. Temperature R1221N33AH 135 130 125 120 115 110 105 ...

Page 17

Soft-start Time vs. Temperature R1221N33AB -50 0 Temperature Topt 11) Delay Time for Latch-type Protection vs. Temperature R1221N33AB 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 -50 0 Temperature Topt 12) Delay ...

Page 18

VD Output Delay Time vs. Temperature R1221N33AB -50 0 Temperature Topt 14) EXT”H” Output Current vs. Temperature R1221N33AB -50 0 Temperature Topt 15) ...

Page 19

VD “L” Output Current vs. Temperature OUT R1221N33AD 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 -50 0 Temperature Topt 17) Load Transient Response R1221N33AA 3.4 3.3 3.2 3.1 3 2.9 2.8 2.7 2.6 2.5 2.4 0 0.0005 ...

Page 20

R1221N33AC 3.4 3.3 3.2 3.1 3 2.9 2.8 2.7 2.6 2.5 2.4 0 0.0005 Time (sec) R1221N33AD 3.4 3.3 3.2 3.1 3 2.9 2.8 2.7 2.6 2.5 2.4 0 0.0005 Time (sec) 18) Turn-on Waveform R1221N33AA (V =10V,I IN 3.5 ...

Page 21

R1221N33AB (V =10V,I IN 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) R1221N33AA (V =10V,I IN 3.5 3 2.5 2 1.5 1 0.5 0 -0.5 -1 -1.5 -2 -2.5 ...

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