R1224N122G RICOH [RICOH electronics devices division], R1224N122G Datasheet

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R1224N122G

Manufacturer Part Number
R1224N122G
Description
PWM/VFM step-down DC/DC Converter
Manufacturer
RICOH [RICOH electronics devices division]
Datasheet
1.R1224N122G.pdf (42 pages)
OUTLINE
phase compensation circuit, a soft-start circuit, a protection circuit, a PWM/VFM alternative circuit, a chip enable
circuit, resistors for output voltage detect, and input voltage detect circuit. A low ripple, high efficiency step-down
DC/DC converter can be easily composed of this IC with only several external components, or a power-transistor,
an inductor, a diode and capacitors. Output Voltage is fixed or can be adjusted with external resistors (Adjustable
types are without PWM/VFM alternative circuit).
into the VFM oscillator from PWM oscillator. Therefore, the efficiency at small load current is improved. Several
types of the R1224Nxxx, which are without a PWM/VFM alternative circuit, are also available.
protection circuit 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. When the cause of large load current or something
else is removed, the operation is automatically released and returns to normal operation.
this IC be standby and suppresses the consumption current and avoid an unstable operation.
FEATURES
APPLICATIONS
PWM/VFM step-down DC/DC Converter
The R1224N Series are CMOS-based PWM step-down DC/DC Converter controllers with low supply current.
Each of these ICs consists of an oscillator, a PWM control circuit, a reference voltage unit, an error amplifier, a
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. The
Further, built-in UVLO function works when the input voltage is equal or less than UVLO threshold, it makes
• Supply Current ................................................................ Typ. 20µA (R1224Nxx2E/F/M/L, R1224N102M)
• Standby Current .............................................................. Typ. 0µA
• Input Voltage Range ....................................................... 2.3V~18.5V
• Output Voltage Range..................................................... 1.2V to 6.0V (R1224Nxx2x)
• Output Voltage Accuracy................................................. ±2.0%
• Oscillator Frequency ....................................................... Typ. 180kHz (R1224Nxx2M, R1224N102M)
• Efficiency......................................................................... Typ. 90%
• Low Temperature-Drift Coefficient of Output Voltage...... Typ. ±100ppm/°C
• Package .......................................................................... SOT-23-5
• Built-in Soft-start Function............................................... Typ. 10ms
• Built-in Current Limit Circuit
• Power source for hand-held communication equipment, cameras, video instruments such as VCRs,
• Power source for battery-powered equipment.
• Power source for household electrical appliances.
camcorders.
Typ. 30µA (R1224Nxx2G, R1224N102G)
Typ. 300kHz (R1224Nxx2E/G, R1224N102G)
R1224N SERIES
Typ. 40µA (R1224Nxx2H, R1224N102H)
1.0V to V
Typ. 500kHz (R1224Nxx2F/H, R1224N102H)
IN
(R1224N102x)
NO.EA-096-061102
1

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R1224N122G Summary of contents

Page 1

PWM/VFM step-down DC/DC Converter OUTLINE The R1224N Series are CMOS-based PWM step-down DC/DC Converter controllers with low supply current. Each of these ICs consists of an oscillator, a PWM control circuit, a reference voltage unit, an error amplifier, a phase ...

Page 2

R1224N BLOCK DIAGRAM EXT EXT 2 *Fixed Output Voltage Type OSC Amp Vref PWM/VFM Soft Start CONTROL Chip Enable Protection UVLO 2 GND *Adjustable Output Voltage Type OSC Amp Vref Soft Start ...

Page 3

SELECTION GUIDE In the R1224N Series, the output voltage, the oscillator frequency, the optional function, and the taping type for the ICs can be selected at the user's request. The selection can be made with designating the part number as ...

Page 4

R1224N PIN CONFIGURATIO PIN DESCRIPTION Pin No Symbol ABSOLUTE MAXIMUM RATINGS Symbol V V Supply Voltage EXT Pin Output Voltage EXT V CE Pin Input Voltage OUT ...

Page 5

ELECTRICAL CHARACTERISTICS • R1224Nxx2X (X=E/F/G/H/L/M) except R1224N102X Symbol Item V Operating Input Voltage IN V Step-down Output Voltage OUT ∆ Step-down Output Voltage OUT ∆ Topt Temperature Coefficient fosc Oscillator Frequency ∆ fosc/ Oscillator Frequency ∆ Topt Temperature ...

Page 6

R1224N • R1224N102X (X=G/H/M) Symbol Item V Operating Input Voltage IN V Feedback Voltage FB ∆ Feedback Voltage FB ∆ Topt Temperature Coefficient fosc Oscillator Frequency ∆ fosc/ Oscillator Frequency ∆ Topt Temperature Coefficient I Supply Current 1 ...

Page 7

TYPICAL APPLICATION AND APPLICATION HINTS (1) Fixed Output Voltage Type (R1224Nxx2E/F/G/H/L/M except xx=10 PMOS: HAT1044M (Hitachi) SD1 : RB063L-30 (Rohm 10µF (Ceramic Type 10Ω (2) Adjustable Output Type (R1224N102G/H/M) Example: Output Voltage=3.2V C1 ...

Page 8

R1224N When you use these ICs, consider the following issues; ⋅As shown in the block diagram, a parasitic diode is formed in each terminal, each of these diodes is not formed for load current, therefore do not use it in ...

Page 9

How to Adjust Output Voltage and about Phase Compensation As for Adjustable Output type, feedback pin (V Output Voltage following equation: OUT V : R2+R4 OUT FB =V ×(R2+R4)/R2 V OUT FB Thus, with changing ...

Page 10

R1224N OPERATION of step-down DC/DC converter and Output Current The step-down DC/DC converter charges energy in the inductor when Lx transistor is ON, and discharges the energy from the inductor when Lx transistor is OFF and controls with less energy ...

Page 11

In the continuous mode, when Equation 1 is solved for ton and assumed that the solution is tonc, tonc=T×V /V ..................................................................................... Equation 2 OUT IN When ton<tonc, the mode is the discontinuous mode, and when ton=tonc, the mode is the ...

Page 12

R1224N External Components 1. Inductor Select an inductor that peak current does not exceed ILmax. If larger current than allowable current flows, magnetic saturation occurs and make transform efficiency worse. When the load current is definite, the smaller value of ...

Page 13

TIMING CHART V IN Input Voltage Rising Time CE V Set Output OUT Voltage EXT V Set Output OUT Voltage V OUT Soft Start The timing chart shown above describes the changing process of input voltage rising, stable operating, operating ...

Page 14

R1224N TEST CIRCUITS Output Voltage, Oscillator Frequency, CE “H” Input Voltage, CE “L” Input Voltage, Soft-start time Oscilloscope V Supply Current 1 2 R1224N GND V OUT EXT “H” Output Current 4 EXT 2 A GND ...

Page 15

TYPICAL CHARACTERISTICS 1)Output Voltage vs. Output Current (*Note) R1224N182E L=10µH 1.850 1.830 1.810 1.790 V 3.3V IN 1.770 1.750 0 Output Current l R1224N182G 1.850 1.830 1.810 1.790 V 3. 1.770 ...

Page 16

R1224N R1224N332E 3.40 3.38 3.36 3.34 3.32 3.30 3.28 3.26 V 4. 3.22 3.20 0 Output Current l R1224N332G 3.400 3.380 3.360 3.340 3.320 3.300 3.280 V 4.8V IN 3.260 V 12V IN ...

Page 17

R1224N332L L=27µH 3.400 3.380 3.360 3.340 3.320 3.300 3.280 3.260 V 4.8V IN 3.240 3.220 3.200 0 100 1000 Output Current l (mA) OUT R1224N332M (V =5V) IN 3.35 3.34 3.33 3.32 3.31 3.30 0 ...

Page 18

R1224N R1224N502F 5.100 5.080 5.060 5.040 5.020 5.000 4.980 V 6.5V 4.960 IN 4.940 V 10V IN 4.920 4.900 0 Output Current l R1224N502G (V 5.05 5.04 5.03 5.02 5.01 5.00 0 Output Current l R1224N502H ...

Page 19

R1224N502M 5.100 5.080 V 6.5V IN 5.060 V 12V IN 5.040 V 15V IN 5.020 5.000 4.980 4.960 4.940 4.920 4.900 0 Output Current l 2) Efficiency vs. Output Current (*Note) R1224N182F (V =3.3V) IN 100 90 80 ...

Page 20

R1224N R1224N182G (V =12V) IN 100 0 Output Current l R1224N182H (V =5.0V) IN 100 0 ...

Page 21

R1224N182M (V =3.3V) CDRH127-27µH IN 100 0 100 Output Current l (mA) OUT R1224N182M (V =12V) CDRH127-27µH IN 100 ...

Page 22

R1224N R1224N332F (V =4.8V) IN 100 0 Output Current l R1224N332G (V =4.8V) IN 100 0 ...

Page 23

R1224N332H (V =12V) CDRH127-10µH IN 100 0 100 Output Current l (mA) OUT R1224N332H (V =15V) CDRH127-10µH IN 100 ...

Page 24

R1224N R1224N332M (V =4.8V) IN 100 0 Output Current l R1224N332M (V 100 Output Current ...

Page 25

R1224N502E (V =10V) CDRH127-10µH IN 100 0 100 Output Current l (mA) OUT R1224N502F (V =10V) CDRH127-10µH IN 100 ...

Page 26

R1224N R1224N502G (V =12V) IN 100 0 Output Current l R1224N502H (V =6.5V) IN 100 0 ...

Page 27

R1224N502L (V =10V) IN 100 0 Output Current l R1224N502M (V =12V) IN 100 0 Output ...

Page 28

R1224N 3) Ripple Voltage vs. Output Current R1224N182E 3. 0 Output Current I R1224N182G 3. 12V ...

Page 29

R1224N332E L=10µ 4. 0 100 1000 Output Current I (mA) OUT R1224N332G L=10µ 4. 12V 15V IN ...

Page 30

R1224N R1224N502E 6. 10V 0 Output Current l R1224N502G 6. 12V 15V ...

Page 31

Output Voltage vs. Input Voltage R1224N182E L=10µH 2.00 1.95 1.90 1.85 1.80 1.75 1.70 1mA 500mA 1.65 1. Input Voltage V R1224N182G 2.00 1.95 1.90 1.85 1.80 1.75 1.70 -1mA -500mA 1.65 1. ...

Page 32

R1224N R1224N332E 3.40 3.38 3.36 3.34 3.32 3.30 3.28 3.26 1mA 3.24 500mA 3.22 3. Input Voltage V R1224N332G 3.40 3.38 3.36 3.34 3.32 3.30 3.28 3.26 -1mA 3.24 -500mA 3.22 3. Input Voltage V R1224N332L ...

Page 33

R1224N502E L=10µH 5.20 5.15 5.10 5.05 5.00 4.95 4.90 1mA 500mA 4.85 4. Input Voltage V (V) IN R1224N502G L=10µH 5.20 5.15 -1mA -500mA 5.10 5.05 5.00 4.95 4.90 4.85 4. Input ...

Page 34

R1224N 5) Output Voltage vs. Temperature R1224N332E 3.33 3.32 3.31 3.30 3.29 3.28 3.27 -40 -15 10 Temperature Topt(˚C) R1224N602L 6.10 6.05 6.00 5.95 5.90 -40 -15 10 Temperature Topt(˚C) 6) Oscillator Frequency vs. Temperature R1224N102G 360 330 300 270 ...

Page 35

R1224N102M 216 198 180 162 144 -40 -15 10 Temperature Topt(˚C) 7) Supply Current vs. Temperature R1224N332E -40 -15 10 Temperature Topt(˚C) R1224N602F -40 -15 10 Temperature Topt(˚C) ...

Page 36

R1224N R1224N102H -40 -15 10 Temperature Topt(˚C) 8) Soft-start time vs. Temperature R1224N102G -40 -15 10 Temperature Topt(˚C) 9) Delay Time for Protection vs. Temperature ...

Page 37

EXT “H” Output Current vs. Temperature R1224N332E -10 -15 -20 -25 -40 -15 10 Temperature Topt(˚C) 11) EXT “L” Output Current vs. Temperature R1224N332E -40 -15 10 Temperature Topt(˚C) 12) Load Transient Response R1224N332G L=10µH ...

Page 38

R1224N R1224N332G 3.50 3.40 3.30 3.20 3.10 3.00 2.90 2.80 2.70 2.60 2.50 -0.0002 -0.0001 0.0000 0.0001 0.0002 0.0003 0.0004 Time(sec) R1224N332H L=10µH V 3.50 3.40 3.30 3.20 3.10 3.00 2.90 2.80 2.70 2.60 2.50 -2E-04 -1E-04 0 1E-04 2E-04 ...

Page 39

R1224N332M L=27µH V 3.50 3.40 3.30 3.20 3.10 3.00 2.90 2.80 2.70 2.60 2.50 -2E-04 -1E-04 0 0.0001 0.0002 0.0003 0.0004 Time(sec) R1224N332M L=27µH V 3.50 3.40 3.30 3.20 3.10 3.00 2.90 2.80 2.70 2.60 2.50 -2E-04 -1E-04 0 1E-04 ...

Page 40

PACKAGE INFORMATION • SOT-23-5 (SC-74A) PACKAGE DIMENSIONS TAPING SPECIFICATION 2.0Max. TAPING REEL DIMENSIONS REUSE REEL (EIAJ-RRM-08Bc) (1reel=3000pcs) 2.9±0.2 1.9±0.2 (0.95) (0.95 0.4±0.1 +0.1 φ1.5 0 0.3±0.1 3.3 TR User Direction of Feed 2±0.5 21±0.8 PE-SOT-23-5-0610 ...

Page 41

PACKAGE INFORMATION POWER DISSIPATION (SOT-23-5) This specification is at mounted on board. Power Dissipation (P This specification is based on the measurement at the condition below: (Power Dissipation (SOT-23-5) is substitution of SOT-23-6.) Measurement Conditions Environment Board Material Board Dimensions ...

Page 42

... R1224N SERIES MARK SPECIFICATION • SOT-23-5 (SC-74A • Part Number vs. Product Code Product Code Part Number Part Number R1224N102G R1224N102H R1224N122G R1224N122H R1224N152G R1224N132H R1224N182G R1224N152H R1224N252G R1224N182H R1224N302G R1224N252H R1224N332G ...

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