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R1243 Series
2A 30V Input PWM Step-down DCDC Converter

Product Specifications

The R1243 Series are 30V input, CMOS-based PWM step-down DC/DC converters featuring 2A* output current. R1243 includes a soft start circuit and a latch or 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 R1243 provides 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 V (32 V)
Supply Current Typ. 0.7 mA (VIN=30V, VFB=1.0V)
Standby Current Typ. 0 µA (VIN=30V, CE=“L”)
Output Voltage Range 0.8 V to 18 V, Adjustable with external resistors
Feedback Voltage 0.5 V with 1.4% accuracy
Output Current Max. 2 A*
Peak Current Limiting Typ. 3.8 A
Internal Nch MOSFET Driver Typ. 175 mΩ
Maximum Duty Cycle Min. 85%
Oscillator Frequency Ver. A/B: 1000 kHz, Ver. C/D: 330 kHz
Latch Type Protection Ver. A/C: Typ. 2 ms, Ver. E: 0.08 ms
Fold-back Type Protection Ver. B: 250 kHz, Ver. D: 82.5 kH
Internal Soft-start Time Typ. 0.4 ms, TSS = Open
External Soft-start Time Typ. 12 ms, CSS = 0.1 µF
Flag Output Typ. 0.25 ms, FLG “OFF” delay time
UVLO Released Voltage Typ. 4.0 V
Thermal Shutdown Typ. 160°C, Hysteresis = 35°C
Packages HSOP-8E (Ver.A/B/C/D/E), DFN(PLP)2527-10 (Ver.A/B/C/D)

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

APPLICATION INFORMATION

R1243x001C/D
(VOUT=5.0V, Soft Start Time 12ms, Flag Function using)

TYPICAL CHARACTERISTICS

Efficiency vs. Output Current

R1243x001A/B, R1243S001E

R1243x001C/D

PIN DESCRIPTION

DFN(PLP)2527-102.5 mm × 2.7 mm

DFN(PLP)2527-10

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

*) The tab is substrate level (GND), must be connected to GND level.
**) The FLG pin connected to the GND level or should be open when FLG is not used.

HSOP-8E5.2 mm × 6.2 mm

HSOP-8E

1 BST
2 VIN
3 Lx
4 GND
5 VFB
6 FLG**
7 CE
8 TSS

*) The tab is substrate level (GND), must be connected to GND level.
**) The FLG pin connected to the GND level or should be open when FLG is not used.


R1243 Series for Consumer

APPLICATIONS

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

PRODUCT LONGEVITY PROGRAM

R1243 series operate PRODUCT LONGEVITY PROGRAM.
This program has been introduced to help customers select the most appropriate part for applications that require long life cycles.


SELECTION GUIDE

The package type, the oscillator frequency (Fixed: 1000 kHz, 330 kHz) and the short-circuit protection type (Latch, Fold-back) are user-selectable options.

Product Name   Package Quantity per Reel
R1243K001#-TR ConsumterPLP DFN(PLP)2527-10 5,000
R1243S001#-E2-FE ConsumterPLP HSOP-8E 1,000
  • # … Specify the oscillator frequency and the short-circuit protection type.
    A: Fixed Frequency: 1000 kHz, Latch Protection
    B: Fixed Frequency: 1000 kHz, Fold-back Protection
    C: Fixed Frequency: 330 kHz, Latch Protection
    D: Fixed Frequency: 330 kHz, Fold-back Protection

DOCUMENT/CONTACT

Purchase

Technical Support

Package *1 Marking Reliability *2
DFN(PLP)2527-10 R1243K R1243K
HSOP-8E R1243S R1243S (-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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