RICOH RP108J Series Low Voltage 3A LDO Regulator with Ext. VOUT Adjustable Data Manual User Guide

RP108J Series

Low Voltage 3A LDO Regulator with Ext. VOUT Adjustable The RP108J Series are CMOS-based LDO regulators featuring 1A output with low on-resistance. The CMOS process provides both large output current and low supply current. The dropout voltage is significantly lower than bipolar regulators. The RP108J handles

low voltage with an input voltage from 1.6V and an output voltage from 0.8V. Accordingly, the device supports highly integrated, low voltage-driven LSI as a rear stage of the DC/DC converter. PR108J081x can set adjustable output voltage with an external resistor. The CE pin can switch the regulator into standby mode. In addition to a fold-back protection circuit built into conventional LDO regulators, RP108J has a thermal shutdown circuit, a reverse current protection circuit and a constant slope circuit. The constant slope circuit is a soft start function to prevent inrush current and mis operation of devices. Ceramic capacitors can be used.

FEATURES • Supply Current (ISS) ························Typ. 350μA (IOUT=0m A, VIN=5.25V) • Load Regulation ·····························Typ. 0.1%/V • Standby Current (Istandby) ·················Typ. 2μA • Line Regulation·······························Typ. 3m V (IOUT=3A) • Dropout Voltage (VDIF) ····················Typ. 0.51V (IOUT=3A, VOUT=2.8V) • Fold-back Protection Circuit ···········Current limit Typ. 220m A • Ripple Rejection (RR)·····················Typ. 65d B (f=1k Hz) • Reverse current protection Circuit • Input Voltage Range1 (VIN) ·············1.6V to 5.25V • Constant Slope Circuit • Output Voltage Range (VOUT)··········0.8V to 4.2V (internally fixed) • Thermal Shutdown Circuit ··············Stops at 165°C

0.8V with external resistors • Auto-Discharge function ·················D Version

• Output Voltage Accuracy ················± 1% • Package··········································TO-252-5-P2 • Temp.coeff.of Output Voltage ·········Typ. ± 100ppm/°C • Ceramic capacitors can be used. ···10μF or more

(The above shows specification at Topt=25°C. Design assurance value at -40°C ≤ Topt ≤ 85°C is also available. For details, please refer to the datasheet.)

BLOCK DIAGRAMS RP108Jxx1B RP108Jxx1D (Without Auto-Discharge function) (With Auto-Discharge function)

VDD ro po ut ol ta ge IF (m V) VOUT VDD VOUT

VFB VFB

Vref Vref

Current Limit Current Limit Thermal Shutdown Thermal Shutdown

CE GND CE GND

Reverse Detecter Reverse Detecter

SELECTION GUIDES TYPICAL APPLICATION

Halogen Free Package Q'ty per Reel Part No. RP108Jxx1x RP108J081x Internally fixed output voltage Ext. adjustable output voltage

TO-252-5-P2 5,000 pcs RP108J.xx.1.∗ -T1-FE

VDD VOUT OUT IN VDD VOUT OUTIN

.xx. : Specify the output voltage within the range of RP108J RP108J R1 CIN VFB COUT

CIN VFB COUT

0.8V (.08.) to 4.2V (.42.) in 0.1V steps.

.∗ : Select from (.B.) without auto-discharge function or CE GND

CE GND

(.D.) with auto-discharge function

The VOUT pin should be connected

Output voltage should be set 4.2V

to the VFB pin

VOUT = 0.8×((R1+R2) / R2 (For details, please refer to the datasheet.)

PACKAGES TYPICAL CHARACTERISTIC

TO-252-5-P2 RP108J251x Dropout Voltage vs. Output Current

1 CE 4 VOUT 2 VDD 5 VFB 3 GND

∗) The tab is substrate level. (GND)

Output Current IOUT (A)

The VOUT pin should be connected to the VFB pin when the output voltage is fixed inside the IC.

APPLICATIONS • Power source for hand-held communication equipment, cameras, and VCRs • Power source for battery-powered equipment • Power source for home appliances

No.EK-203-111003 CMOS LDO Regulator