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R1202L721D-TR

Description
Switching Voltage Regulators PWM Step-up DCDC Converter for White LED/PMOLED and General Use with Shutdown Function
CategoryPower/power management    The power supply circuit   
File Size1MB,31 Pages
ManufacturerRICOH Electronic Devices Co., Ltd.
Environmental Compliance
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R1202L721D-TR Overview

Switching Voltage Regulators PWM Step-up DCDC Converter for White LED/PMOLED and General Use with Shutdown Function

R1202L721D-TR Parametric

Parameter NameAttribute value
Is it lead-free?Lead free
Is it Rohs certified?conform to
MakerRICOH Electronic Devices Co., Ltd.
Parts packaging codeDFN
package instruction1.60 X 1.60 MM, HALOGEN FREE AND ROHS COMPLIANT, DFN-6
Contacts6
Reach Compliance Codeunknown
ECCN codeEAR99
Analog Integrated Circuits - Other TypesSWITCHING REGULATOR
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage5.5 V
Minimum input voltage1.8 V
Nominal input voltage3.6 V
JESD-30 codeS-PDSO-N6
JESD-609 codee4
length1.6 mm
Humidity sensitivity level1
Number of functions1
Number of terminals6
Maximum operating temperature85 °C
Minimum operating temperature-40 °C
Maximum output current0.9 A
Package body materialPLASTIC/EPOXY
encapsulated codeHVSON
Package shapeSQUARE
Package formSMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE
Peak Reflow Temperature (Celsius)260
Certification statusNot Qualified
Maximum seat height0.4 mm
surface mountYES
Switch configurationBOOST
Maximum switching frequency1400 kHz
technologyCMOS
Temperature levelINDUSTRIAL
Terminal surfacePalladium (Pd)
Terminal formNO LEAD
Terminal pitch0.5 mm
Terminal locationDUAL
Maximum time at peak reflow temperatureNOT SPECIFIED
width1.6 mm
R1202x Series
STEP-UP DC/DC CONVERTER with SHUTDOWN FUNCTION
NO.EA-255-170915
OUTLINE
The R1202x Series are CMOS-based PWM step-up DC/DC converter ICs with low supply current.
Each of these ICs consists of an NMOS FET, NPN transistor, an oscillator, a PWM comparator, a voltage
reference unit, an error amplifier, a current limit circuit, an under voltage lockout circuit (UVLO), an over-voltage
protection circuit (OVP), a soft-start circuit, a Maxduty limit circuit, and a thermal shutdown protection circuit. By
simply using an inductor, a resistor, and capacitors as external components, a high-efficiency step-up DC/DC
converter can be easily configured. At the standby mode, a rectifier transistor can separate the output from the
input.
The R1202x Series include a thermal shut-down circuit and an under-voltage lockout circuit (UVLO) which
separate the output from the input to shut down the current when the overheat caused when the output is connected
to the Gnd is detected and also during the UVLO detection. As other protection functions, the R1202x Series
contain a cycle by cycle current limit circuit that limits the Lx peak current, and an over-voltage protection circuit
(OVP) that detects the output overvoltage.
The R1202x Series offer three versions: the R1202xxxxA/B versions, which are optimized for constant-voltage
power supply and the R1202xxxxD version, which is optimized to drive serial white LEDs with constant current.
While the R1202xxxxA version discharges the V
OUT
output to 0V at the shutdown, the R1202xxxxB version doesn’t.
The brightness of the white LEDs can be adjusted quickly by applying a PWM signal (200Hz to 300kHz) to the CE
pin.
The R1202x Series are available in DFN1616-6B and TSOT-23-6 packages.
FEATURES
Input Voltage Range ......................................... 2.3V to 5.5V (R1202xxxxA/B)
1.8V to 5.5V (R1202xxxxD)
Supply Current ................................................. Typ. 800µA
Standby Current ............................................... Max. 5µA
Feedback Voltage ............................................ 1.0V±15mV (R1202xxxxA/B)
0.2V±10mV (R1202xxxxD)
Oscillator Frequency ........................................ Typ. 1.2MHz
Maximum Duty Cycle ....................................... Typ. 91%
UVLO Function ...............................................
Typ.2.0V (Hys.Typ.0.2V) (R1202xxxxA/B)
Typ.1.6V (Hys.Typ.0.1V) (R1202xxxxD)
Lx Current Limit Function ................................. Select from 350mA, 700mA
Over Voltage Protection ................................... Select from 14V-23V (Refer the Selection Guide)
LED dimming control for R1202xxxxD ............. by external PWM signal (Frequency 200Hz to 300kHz)
Thermal Protection Function .......................... Typ.150ºC(Hys.Typ.50ºC)
Built-in Auto Discharge Function ...................... R1202xxxxA
NMOS ON Resistance ..................................... 1.35Ω
Packages ......................................................... DFN1616-6B, TSOT-23-6
APPLICATION
Constant Voltage Power Source for portable equipment
OLED power supply for portable equipment
White LED Backlight for portable equipment
1

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