Skip to main content Skip to first level navigation
Skip to main content First level navigation Menu
Contact Us About Us ricoh.com
Breadcrumbs
Facebook (Open link in new window) YouTube (Open link in new window) LinkedIn (Open link in new window)
Main content
Main content

R1203 Series

PWM Step-up DC/DC Converter for White LED

  • Consumer
  • RoHS

The R1203 Series are CMOS-based PWM step-up DC/DC converters, which are optimized to drive white LEDs with constant current. R1203 includes an under-voltage lockout circuit (UVLO), and over-voltage protection circuit (OVP). By simply using an inductor, a resistor, capacitors and a diode as external components, white LEDs can be driven with constant current and high efficiency. The LED current can be determined by the value of current setting resistor. The brightness of the LEDs can be adjusted quickly by applying a PWM signal (200Hz to 300kHz) to the CE pin. Two different pin layout of SOT-23-6 package as R1203N and R1206N are available.

Specs & Datasheets

  Consumer
Input Voltage Range 1.8 V to 5.5 V (6.5 V)
Operating Temperature Range -40°C to 85°C (125°C)
Supply Current Typ. 500 µA
Standby Current Typ. 1 µA
Output Voltage Range Externally Adjustable: 28.7 V
Feedback Voltage 0.2 V
Feedback Voltage Accuracy ±10 mV
Feedback Voltage Temperature Coefficient ±150 ppm/°C
Driver ON-resistance Typ. 1.35 Ω
Oscillator Frequency Typ. 1.2 MHz
Maximum Duty Cycle Typ. 91%
Package DFN1616-6B, SOT-23-6

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

R1203x071B Typical Application

R1203x071B Typical Application

7LEDs Efficiency vs. Output Current

7LEDs Efficiency vs. Output Current

Quality & Packages

Product Name Compatibility Package Marking Reliability
R1203L071B-TR
  • gradeConsumerC
DFN1616-6B R1203L R1203L
R1203N071B-TR-FE
  • gradeConsumerC
SOT-23-6 R1203N R1203N-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Please contact us or our distributors for unpublished reliability information.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 Boost
VIN
min (V)
1.8
VIN
max (V)
5.5
VOUT
max (V)
28.7
ISS
(µA)
500