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RP401K521A-TR

Description
Switching Voltage Regulators 1A PWM/VFM Step-up DCDC Converter
Categorysemiconductor    Power management   
File Size697KB,27 Pages
ManufacturerRICOH Electronic Devices Co., Ltd.
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RP401K521A-TR Overview

Switching Voltage Regulators 1A PWM/VFM Step-up DCDC Converter

RP401K521A-TR Parametric

Parameter NameAttribute value
Product CategorySwitching Voltage Regulators
ManufacturerRICOH Electronic Devices Co., Ltd.
PackagingReel
Factory Pack Quantity5000
RP401x SERIES
HIGH EFFICIENCY, SMALL PACKAGES, STEP-UP DC/DC CONVERTERS
NO.EA-260-160812
OUTLINE
RP401x Series are high efficiency, step-up DC/DC converter ICs packaged in compact 5pin SOT23-5 or 6pin
DFN(PLP)1820-6. This IC can start up from low voltage (Typ.0.6V), therefore, it is suitable for using with single or
2 serial alkaline batteries, or a nickel-metal-hydride (NiMH) battery, or one-cell Lithium-ion (Li+) battery.
This IC consists of an oscillator, a reference voltage unit with soft start, a chip enable circuit, an error amplifier,
phase compensation circuits, a slope circuit, a PWM control circuit, a start-up circuit, a PWM/VFM mode control
circuit, internal switches and a protection circuit.
A low ripple high efficiency step-up DC/DC converter can be composed of the RP401x with only an inductor, a
diode, (resisters for adjustable type), and capacitors. The output voltage of the RP401K001s is adjustable, and
others are fixed internally. The output voltage range is from 1.8V to 5.5V. RP401Kxx1A/B series have a MODE pin
to alternate between PWM fix and PWM/VFM automatic shift to improve the efficiency at light load. If MODE pin is
set "H", the mode is PWM fix, and when the MODE pin is set "L", PWM/VFM automatic shift. The RP401xxx1C
and D do not have MODE pin. The RP401xxx1C is PWM/PFM alternative type, and the RP401xxx1D is PWM
fixed type.
FEATURES
Low Start-up Voltage guaranteed ························Typ. 0.6V
Input Voltage Range ········································0.6V ~ 5.5V
High Efficiency ···············································86% (100mA / 3.3V, V
IN
= 1.5V, 25°C)
Output current ················································500mA / 1.8V (V
IN
= 1.5V) / 5.0V (V
IN
= 3.3V)
Built-in Lx switch ·············································NMOS: 0.4Ω (V
OUT
= 3.3V, 25°C)
PWM Oscillator Frequency ································1.2MHz
Output Voltage Range ······································Fixed type: 1.8V to 5.5V with 0.1V Stepwise
Adjustable: 1.8V ~ 5.5V
(Recommendation range of output voltage)
Lx peak current limit function ·····························Typ. 1.0A
Latch protection delay time································3.3ms (Only applied to A version)
Small Packages ··············································DFN(PLP)1820-6, SOT23-5
APPLICATIONS
MP3 players, PDA, cellular phones
Digital Still Cameras
LCD Bias Supplies
Portable blood pressure meter
Wireless Handset
GPS
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