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R1224 Series
18.5V Input PWM/VFM Step-down DCDC Controller

Product Specifications

The R1224 Series are low supply current CMOS-based PWM/VFM step-down DC/DC controller with an external output transistor. By simply using a power transistor, an inductor, a diode, and a capacitor as external components, a high-efficiency step-down DC/DC converter can be easily configured. The PWM/VFM alternative circuit automatically switches to VFM control in the smaller output current range and provides high efficiency even in the smaller output current range. The version with fixed PWM control and adjustable output voltage with an external resistor is also available.

The reset type protection circuit embedded into the device limits output current by repeatedly triggering the soft start circuit when the oscillator maximum duty cycle continues for a predetermined period of time. When the oscillator maximum duty cycle ends, normal operation is resumed automatically. R1224 also includes an under-voltage lockout circuit (UVLO) that stops DC/DC operation and prevents malfunction when the supply voltage falls below the UVLO detect voltage and reduces supply current.

FEATURES

Input Voltage Range (Maximum Rating) 2.3 V to 18.5 V (20.0 V)
Supply Current Typ. 20 µA (R1224Nxx2E/F/M/L, R1224N102M)
Typ. 30 µA (R1224Nxx2G, R1224N102G)
Typ. 40 µA (R1224Nxx2H, R1224N102H)
Standby Current Typ. 0 µA
Output Voltage Range 1.2 V to 6.0 V (0.1 V steps; R1224Nxx2x)
1.0 V to VIN (R1224N102x)
Output Voltage Accuracy ±2.0%
Oscillator Frequency Typ. 180 kHz (R1224Nxx2L/M, R1224N102M)
Typ. 300 kHz (R1224Nxx2E/G, R1224N102G)
Typ. 500 kHz (R1224Nxx2F/H, R1224N102H)
Efficiency Typ. 90%
Reset Protection Circuit Typ. 15 ms
Temperature-Drift Coefficient of Output Voltage Typ. ±100 ppm/°C
Package SOT-23-5
Soft Start Time Typ. 10 ms
Protection Function Built-in Current Limit Circuit

APPLICATION INFORMATION

R1224Nxx2E/F/G/H/L/M

L: 27µH, C1: 10µF, C2: 0.1µF, C3: 47µF, R1: 10Ω

TYPICAL CHARACTERISTICS

R1224N332E Efficiency vs. Output Current

PIN DESCRIPTION

SOT-23-52.9 mm × 2.8 mm

SOT-23-5

1 CE
2 GND
3 VOUT or VFB
4 EXT
5 VIN

R1224 Series for Consumer

APPLICATIONS

  • Power source for hand-held communication equipment, cameras, video instruments such as VCRs, camcorders
  • Power source for battery-powered equipment
  • Power source for household electrical appliances

SELECTION GUIDE

The output voltage, the oscillator frequency, the modulation method and the output voltage adjustment for the ICs can be selected at the user’s request.

Product Name   Package Quantity per Reel
R1224Nxx2#−TR-FE Consumter SOT-23-5 3,000
  • xx … The output voltage can be designated in the range from 1.2V(12) to 6.0V(60) in 0.1V steps.
    (For externally adjustable output voltage type, feedback voltage of 1.0V(10).)
  • # … The oscillator frequency, the modulation method and the output voltage adjustment are options as follows.
    E: 300kHz, PWM/VFM, internally fixed
    F: 500kHz, PWM/VFM, internally fixed
    G: 300kHz, fixed PWM, internally fixed/externally adjustable
    H: 500kHz, fixed PWM, internally fixed/externally adjustable
    L: 180kHz, PWM/VFM, internally fixed
    M: 180kHz, fixed PWM, internally fixed/externally adjustable

DOCUMENT/CONTACT

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Technical Support

Package *1 Marking Reliability *2
SOT-23-5 R1224N R1224N (-FE)

*1: The package file includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and land pattern (foot pattern).
*2: Reliability file includes a reliability test report and a reflow profile.

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