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R1223 Series
13.2V Input PWM/VFM Step-down DCDC Controller

Product Specifications

The R1223 Series are 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 capacitors 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 is available. The current limit protection circuit can be selected from reset type or latch type.

FEATURES

Input Voltage Range (Maximum Rating) 2.3 V to 13.2 V (15.0 V)
Supply Current Typ. 100 µA (R1223Nxx2A/C/E/G)
Typ. 140 µA (R1223Nxx2B/D/F/H)
Standby Current Typ. 0 µA
Output Voltage Range 1.5 V to 5.0 V (0.1 V step)
Output Voltage Accuracy ±2.0%
Oscillator Frequency 300 kHz, 500 kHz
Efficiency Typ. 90%
Temperature-Drift Coefficient of Output Voltage Typ. ±100 ppm/°C
Soft Start Time Typ. 10 ms (300 kHz), Typ. 6 ms (500 kHz)
Reset Protection Circuit Delay time for protection
Typ. 3 ms (300 kHz), Typ. 2 ms (500 kHz)
Latch Protection Circuit Delay time for protection
Typ. 3 ms (300 kHz), Typ. 2 ms (500 kHz)
Package SOT-23-5

APPLICATION INFORMATION

R1223N

L: 27µH, CIN: 10µF×2, COUT: 47µF

TYPICAL CHARACTERISTICS

R1223N332A Efficiency vs. Output Current

PIN DESCRIPTION

SOT-23-52.9 mm × 2.8 mm

SOT-23-5

1 CE
2 GND
3 VOUT
4 EXT
5 VIN

R1223 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

In the R1223 Series, the output voltage, the oscillator frequency, switching mode and type of short protection (Latch or Reset) for the IC are selectable at the user’s request.

Product Name   Package Quantity per Reel
R1223Nxx2#−TR-FE Consumter SOT-23-5 3,000
  • xx … The output voltage can be designated in the range from 1.5V(15) to 5.0V(50) in 0.1V steps.
  • # … Designation of the oscillator frequency, switching mode and type of short protection.
    A: 300kHz, PWM/VFM, Latch type
    B: 500kHz, PWM/VFM, Latch type
    C: 300kHz, fixed PWM, Latch type
    D: 500kHz, fixed PWM, Latch type
    E: 300kHz, PWM/VFM, Reset type
    F: 500kHz, PWM/VFM, Reset type
    G: 300kHz, fixed PWM, Reset type
    H: 500kHz, fixed PWM, Reset type

DOCUMENT/CONTACT

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Technical Support

Package *1 Marking Reliability *2
SOT-23-5 R1223N R1223N (-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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