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R1244 Series
1.2A 30V Input PWM Step-down DCDC Converter

Product Specifications

The R1244 Series are 30V input, CMOS-based PWM step-down DC/DC converters featuring 1.2A* output current. R1244 include a soft start circuit and a fold-back protection circuit. By simply using an inductor, resistors, a diode, and capacitors as external components, a high-efficiency step-down DC/DC converter can be easily configured. Due to current mode PWM control, the R1244 provide a fast response and high efficiency.

*) This is an approximate value, because output current depending on conditions and external parts.

FEATURES

Input Voltage Range (Maximum Rating) 4.5 V to 30.0 V (32.0 V)
Supply Current Typ. 500 µA (No switching)
Standby Current Typ. 0 μA (CE="L")
Output Voltage Range 0.8 V to 15.0 V (Externally adjustable)
(Feedback voltage : 0.8 V)
Feedback Voltage Accuracy ±12 mV
Output Current 1.2 A*
Oscillator Frequency 1.25 MHz
Oscillator Maximum Duty Cycle Typ. 85%
Minimum ON Time Typ. 100 ns
UVLO Detect Voltage Typ. 3.8 V
Soft Start Time Typ. 0.4 ms
High Side Switch Limit Current Typ. 2 A
Thermal Shutdown Circuit Stops at 160°C
Fold-back Protection Circuit Fold-back frequency Typ. 310 kHz
Package SOT-23-6W

*) This is an approximate value, because output current depending on conditions and external parts.

APPLICATION INFORMATION

R1244 (VOUT=3.3V)

TYPICAL CHARACTERISTICS

Efficiency vs. Output Current

PIN DESCRIPTION

SOT-23-6W2.9 mm × 2.8 mm

SOT-23-6W

1 BST
2 GND
3 VFB
4 CE
5 VIN
6 Lx

R1244 Series for Consumer

APPLICATIONS

  • Digital Home Appliances
  • Hand-held Communication Equipment, Cameras, VCRs, Camcorders
  • Battery-powered Equipment
  • Battery Charger

SELECTION GUIDE

Product Name   Package Quantity per Reel
R1244N001B-TR-FE Consumter SOT-23-6W 3,000

DOCUMENT/CONTACT

Package *1 Marking Reliability *2
SOT-23-6W R1244N R1244N (-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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