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Step-down DCDC Converters (High voltage: ~40V)

Product Name Control Input Voltage Range [V] Output Voltage Range [V] VFB Voltage Accuracy Switching Frequency [kHz] Output Current [A]*1 Protection Circuit Other Features Package Datasheet
R1240 PWM 4.5 to 30.0 0.8 to 15.0,
Ext.adjustable
0.8V
±12mV
1250 1.2 Latch,
Fold-back
UVLOSoft-StartThermal SOT-23-6W*2
DFN(PLP)2527-10
Consumer
Design guide
R1244 PWM 4.5 to 30.0 0.8 to 15.0,
Ext.adjustable
0.8V
±12mV
1250 1.2 Fold-back UVLOSoft-StartThermal SOT-23-6W*2 -
R1245
*
PWM 4.5 to 30.0 0.8 to 27.6,
Ext.adjustable
0.8V
±8mV
330, 500, 1000, 2400 1.2 Latch,
Fold-back
UVLOSoft-StartThermal DFN(PLP)2020-8
SOT-23-6W*2
HSOP-8E
Consumer
R1243 PWM 4.5 to 30.0 0.8 to 18.0,
Ext.adjustable
0.5V
±7mV
330, 1000 2 Latch,
Fold-back
UVLOThermal
Soft-Start: Ext. Adjustable
DFN(PLP)2527-10
HSOP-8E
Consumer
R1242 PWM 5.0 to 30.0 0.8 to 15.0,
Ext.adjustable
0.8V
±12mV
330, 500, 1000,
330 to 1000: Ext.adjustable
3 Latch,
Fold-back
Synchro: with external low side transistor
UVLOSoft-StartThermal
HSOP-8E Consumer
Design guide
R1270
*
PWM,
PWM/VFM Auto-Switching
3.6 to 34.0 0.8 to 31.6,
Ext.adjustable
0.8V
±8mV
300 to 2400: Ext.adjustable,
Ext.synchronizable with PLL Circuit
3 Latch,
Fold-back
UVLOThermalOVLO
Soft-Start: Ext. Adjustable
HSOP-18 Consumer
Design guide
R1272
*
Forced PWM,
PWM/VFM Auto-Switching
4.0 to 34.0 0.7 to 5.3,
Ext.adjustable
0.64V
±1%
250 to 1000: Ext.adjustable,
Ext.synchronizable with PLL Circuit
Ext. Latch, Hiccup SynchroSSCGPGUVLOThermal OVP
Soft-Start: Ext. Adjustable
HSOP-18 Consumer
R1273
*
Forced PWM,
PWM/VFM Auto-Switching
4.0 to 34.0 0.7 to 5.3,
Ext.adjustable
0.64V
±1%
250 to 1000: Ext.adjustable,
Ext.synchronizable with PLL Circuit
14 Latch, Hiccup SynchroSSCGPGUVLOThermalOVP
Soft-Start: Ext. Adjustable
QFN0505-32B Consumer
NEW
R1275
*
Forced PWM 3.6 to 30.0 3.3 to 5.0,
Ext.adjustable
0.64V
±1%
2000: Ext.adjustable,
Ext.synchronizable with PLL Circuit (1800 to 2200)
2 Hiccup SynchroSSCGPGUVLOThermal OVLO
Soft-Start: Ext. Adjustable
HSOP-18 Consumer
  • *: Products partially available for applications under a high temperature environment.
  • *1Output Current (IOUT) can be affected by environmental conditions or external components. This is an approximate value.
  • *2The pin-layout of R1240N and that of R1244N is upside down.

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