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R1223 Series

13.2V Input PWM/VFM Step-down DC/DC Controller

  • Consumer
  • RoHS

The R1223 Series are CMOS-based PWM/VFM step-down DC/DC controller with an external output transistor. By simply using a power transistor, an inductor, a diode, and capacitors as external components, a high-efficiency step-down DC/DC converter can be easily configured. The PWM/VFM alternative circuit automatically switches to VFM control in the smaller output current range and provides high efficiency even in the smaller output current range. The version with fixed PWM control is available. The current limit protection circuit can be selected from reset type or latch type.

Specs & Datasheets

Input Voltage Range 2.3 V to 13.2 V (15.0 V)
Operating Temperature Range -40°C to 85°C (125°C)
Supply Current Typ. 100 µA (R1223Nxx2A/C/E/G)
Typ. 140 µA (R1223Nxx2B/D/F/H)
Standby Current Typ. 0 µA
Output Voltage Range 1.5 V to 5.0 V (0.1 V step)
Output Voltage Accuracy ±2% (Ta = 25°C)
Output Voltage Temperature Coefficient Typ. ±100 ppm/°C
Oscillator Frequency Typ. 300 kHz, 500 kHz
Efficiency Typ. 90%
Package SOT-23-5

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

Typical Application

Typical Application

L: 27µH, CIN: 10µF×2, COUT: 47µ

R1223N332A Efficiency vs. Output Current

R1223N332A Efficiency vs. Output Current

Quality & Packages

Product Name Compatibility Package Marking Reliability
  • gradeConsumerC
SOT-23-5 R1223N R1223N-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Please contact us or our distributors for unpublished reliability information.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

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