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R1240 Series
1.2A 30V Input PWM Step-down DCDC Converter

Product Specifications

The R1240 Series are 30V input, CMOS-based PWM step-down DC/DC converters featuring 1.2A* output current. R1240 include a soft start circuit and a latch or 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 R1240 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 Min. 75%, 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
Latch Protection Circuit Delay time for protection Typ. 2 ms (A Version)
Fold-back Protection Circuit Fold-back frequency Typ. 310 kHz (B Version)
Packages DFN(PLP)2527-10, SOT-23-6W

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

APPLICATION INFORMATION

R1240 (VOUT=3.3V)

TYPICAL CHARACTERISTICS

Efficiency vs. Output Current

PIN DESCRIPTION

DFN(PLP)2527-102.5 mm × 2.7 mm

DFN(PLP)2527-10

1 Lx
2 VIN***
3 VIN***
4 CE
5 TEST**
6 GND
7 NC
8 VFB
9 NC
10 BST

*) The tab is substrate level (GND).
**) TEST pin should be open.
***) The VIN pin must be wired together when it is mounted on board.

SOT-23-6W2.9 mm × 2.8 mm

SOT-23-6W

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

R1240 Series for Consumer

APPLICATIONS

  • Digital Home Appliances: Digital TVs, DVD Players
  • OA Equipment: Printers, Fax
  • Hand-held Communication Equipment, Cameras, VCRs, Camcorders
  • Battery-powered Equipment

SELECTION GUIDE

In the R1240, the Package, type of short protection (Latch or Fold-back) can be selected at the user’s request.

Product Name   Package Quantity per Reel
R1240K003#-TR Consumter DFN(PLP)2527-10 5,000
R1240N001#-TR-FE Consumter SOT-23-6W 3,000
  • # … Designation of Optional Function at off state are options as follows.
    A: Latch Type protection
    B: Fold-back Type protection

DOCUMENT/CONTACT

Purchase

Technical Support

Package *1 Marking Reliability *2
DFN(PLP)2527-10 R1240K R1240K
SOT-23-6W R1240N R1240N (-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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