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R1243 Series

2A 30V Input PWM Step-down DC/DC Converter

  • Consumer
  • PLP
  • RoHS

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.

Specs & Datasheets

  Consumer
Input Voltage Range 4.5 V to 30.0 V (32.0 V)
Operating Temperature Range -40°C to 85°C (125°C)
Supply Current Typ. 700 µA (VIN = 30 V, VFB = 1.0 V)
Standby Current Typ. 0 µA (VIN = 30 V, CE = “L”)
Output Voltage Range Externally Adjustable: 0.8 V to 18.0 V
Feedback Voltage 0.5 V
Feedback Voltage Accuracy ±7 mV
Output Current Max. 2 A
Driver ON-resistance Typ. 175 mΩ
Oscillator Frequency 1000 kHz (Ver.A/B/E)
330 kHz (Ver.C/D)
Maximum Duty Cycle Min. 85%
Package DFN(PLP)2527-10, HSOP-8E

Download Datasheet

Protections / Functions

Functional Description

TSD ILX OCP OVP UVLO OVLO Reverse Shutdown Soft Start SSCG PGOOD Auto Discharge Anti-ringing Sequencing Max Duty Ext. Phase LED Adjust
                     

Technical Documents

R1243x001C/D Typical Application

R1243x001C/D Typical Application

VOUT=5.0V, Soft Start Time 12ms, Flag Function using

R1243x001A/B, R1243S001E Efficiency vs. Output Current

R1243x001A/B, R1243S001E Efficiency vs. Output Current

R1243x001C/D Efficiency vs. Output Current

R1243x001C/D Efficiency vs. Output Current

Quality & Packages

Product Name Compatibility Package Marking Reliability
R1243K001x-TR
  • gradeConsumerC
  • plpP
DFN(PLP)2527-10 R1243K R1243K
R1243S001x-E2-FE
  • gradeConsumerC
  • plpP
HSOP-8E R1243S R1243S-FE

Refer to the datasheets for the details on the product.
The package file includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and recommended land pattern.
Please contact us or our distributors for unpublished reliability information.

Sample / Buy

Functional Description

TSD Thermal Shutdown Function
ILX LX Current Limit Function
OCP Overcurrent Protection
OVP Overvoltage Protection
UVLO Undervoltage Lockout Protection
OVLO Overvoltage Lockout Protection
Reverse Reverse Current Protection Circuit
Shutdown Shutdown Function
Soft Start Soft Start Function
SSCG Spread Spectrum Clock Generator Function
PGOOD Power Good Output
Auto Discharge Auto Discharge Function
Anti-ringing Anti-ringing Switch Function
Sequencing Start-up Sequencing Control
Max Duty Maximum Duty Cycle
Ext. Phase Externally Adjustable Phase Compensation
LED Adjust LED High-speed Dimming Control

Search for similar products under conditions below.

Category:DC/DC Switching Regulators

Topology Buck
VIN
min (V)
4.5
VIN
max (V)
30.0
VOUT
min (V)
0.8
VOUT
max (V)
18.0
IOUT
(mA)
2000
ISS
(µA)
700