5 V, 1 A Voltage-regulator ICs
with Reset Function
Overview
The L88R05 Series is a series of low-saturation voltage
regulator ICs that are equipped with a function that generates a
reset signal when the power supply for a microcontroller
system is turned on or off.
Applications
.Prevents malfunction when the microcontroller power supply
is turned on or off.
.Designed to handle malfunction caused by momentary power
interruptions.
.Suited for portable electronic equipment, mobile electronic
equipment, and other battery-powered equipment with little
capacity to handle fluctuation in input voltage; also suited
for equipment with large fluctuations in the primary power
supply.
Functions
.Power supply reset generation function; the reset threshold
voltages are ranked.
L88R05C: VRT = 4.5 V
L88R05D: VRT = 4.2 V
L88R05E: VRT = 3.9 V
.5 V, 1 A output characteristics
Package Dimensions
unit : mm
3079-T0220-5H
[L88R05 Series]
SANYO : TO220-5H
Features
.Minimum I/O voltage difference is small (0.5 V typ.), making power conservation possible, and makes smaller heatsink and
transformers possible.
.External capacitor for reset signal output delay time adjustment.
.Sink/source reset output provides compatibility with logic circuitry that has an internal pull-down resistor. Active pull-up
facilitates noise suppression.
.Various types of protective circuits on chip (fold back current limiting, thermal protection).
.The package is the TO220-5H; this package facilitates designs for the radiation of heat during the mounting process.
Ordering number: EN3892B
Monolithic Linear IC
L88R05 Series
Any and all SANYO products described or contained herein do not have specifications that can handle
applications that require extremely high levels of reliability, such as life-support systems, aircraft’s
control systems, or other applications whose failure can be reasonably expected to result in serious
physical and/or material damage. Consult with your SANYO representative nearest you before using
any SANYO products described or contained herein in such applications.
SANYO assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other
parameters) listed in products specifications of any and all SANYO products described or contained
herein.
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
O1596HA(II)/5272TS No.3892-1/6
Specifications
Maximum Ratings at Ta = 25°C
Parameter Symbol Conditions Ratings Unit
Maximum input voltage VIN max 18 V
Reset pin voltage VRES max 18 V
Allowable power dissipation Pd max Ta %25°C, independent IC 1.75 W
Tc %50°C, ideal radiation of heat 20 W
Junction-to-ambiet thermal
resistance Uj-a 71.4 °C/W
Junction-to-case thermal
resisitance Uj-c 5 °C/W
Operating temperature Topr –40 to +85 °C
Storge temperature Tstg –55 to +150 °C
Operating Conditions at Ta = 25 °C
Parament Symbol Conditions Ratings Unit
Input voltage VIN 5.6to17 V
Output current lOUT 0to1 A
Reset output source current lORH 0to200 μA
Reset output sink current lORL 0to2 mA
Operating Characteristics at Tj = 25 °C, VIN =8V,I
OUT =1A,C
OUT =47μA for specified circuits
Parameter Symbol Condition min typ max Unit
[Power Supply]
Output voltage VOUT 4.85 5.0 5.15 V
Dropout voltage VDROP1 0.5 1.0 V
VDROP2 lOUT = 300 mA 0.25 0.50 V
Line regulation ΔVOLN 5.6 V %VIN %17 V 10 70 mV
Load regulation ΔVOLD 5mA%IOUT %1 A 50 150 mV
Peak output current lOP 11.8 A
Output short-circuit current lOSC 0.3 1.2 A
Current drain IQ1 IOUT =0 2.1 4 mA
IQ2 32 80 mA
Output noise voltage VNO 10 Hz %f%100 kHz 70 μVrms
Output voltage temperature
coefficient ΔVo/ΔTa Tj =25 to 125 °C –0.5 mV/°C
Ripple rejection ratio Rrej f = 120 Hz, 6 V %VIN %17 V 60 dB
[Reset]
High-level reset output voltage VORH lORH = 200 μA, CD open 4.83 4.98 5.13 V
Low-level reset output voltage VORL lORL = 2 mA, CD grounded 100 200 mV
Reset threshold voltage VRT
C-rank 4.3 4.5 4.7 V
D-rank 4.0 4.2 4.4 V
E-rank 3.7 3.9 4.1 V
Reset hysteresis voltage Vhys 50 100 200 mV
Output delay time tdCd = 0.1 μF 7.5 10 12.5 ms
Pin Assignments
Top view
L88R05 Series
No.3892-2/6
Equivalent Circuit Block Diagram
Measurement Circuit
Starter circuit
Reference
voltage
Error
amplifier
Thermal
protection
Overcurrent
limiting
Unit (capacitance: F)
L88R05 Series
No.3892-3/6
Sample Application Circuit
Notes:
1. Set COUT to be 47 μF or greater and select it according to the applications.
2. Use the capacitators for COUT and Cd with high-temperature stability.
L88R05C’s Reset Operation
To VDD of peripheral
circuit
Unit (capacitance: F)
L88R05 Series
No.3892-4/6
VO–I
O
Output voltage, VO–V
Output current, IO–A
VO–V
IN
Input voltage, VIN –V
Output voltage, VO–V
VO–Ta
Output voltage, VO–V
Ambient temperature, Ta – °C
IQ–V
IN
Current drain, IQ–mA
Input voltage, VIN –V
IQ–I
O
Current drain, IQ–mA
Output current, IO–A
VDROP –I
O
Dropout voltage, VDROP –V
Output current, IO–A
VRES –V
O
C-type
Reset voltage, VRES –V
Output voltage, VO–V
VRES –V
O
D-type
Reset voltage, VRES –V
Output voltage, VO–V
L88R05 Series
No.3892-5/6
VRES –V
O
E-type
Reset voltage, VRES – V
Output voltage, VO–V
Pdmax–Ta
Infinite heatsink Sillicon grease on heatsink
39 Nvcm mounting torque
θj-c=5°C/W
θj-a = 71.4°C/W
Allowable power dissipation, Pd max – W
100 ×100 ×2mm
3
Al plate
50 ×50 ×2mm
3
Al plate
No heatsink
Ambient temprature, Ta – °C
L88R05 Series
PS No.3892-6/6
Specifications of any and all SANYO products described or contained herein stipulate the performance,
characteristics, and functions of the described products in the independent state, and are not guarantees
of the performance, characteristics, and functions of the described products as mounted in the customer’s
products or equipment. To verify symptoms and states that cannot be evaluated in an independent device,
the customer should always evaluate and test devices mounted in the customer’s products or equipment.
SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all
semiconductor products fail with some probability. It is possible that these probabilistic failures could
give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire,
or that could cause damage to other property. When designing equipment, adopt safety measures so
that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective
circuits and error prevention circuits for safe design, redundant design, and structural design.
In the event that any or all SANYO products(including technical data,services) described or
contained herein are controlled under any of applicable local export control laws and regulations,
such products must not be exported without obtaining the export license from the authorities
concerned in accordance with the above law.
No part of this publication may be reproduced or transmitted in any form or by any means, electronic or
mechanical, including photocopying and recording, or any information storage or retrieval system,
or otherwise, without the prior written permission of SANYO Electric Co. , Ltd.
Any and all information described or contained herein are subject to change without notice due to
product/technology improvement, etc. When designing equipment, refer to the “Delivery Specification”
for the SANYO product that you intend to use.
Information (including circuit diagrams and circuit parameters) herein is for example only ; it is not
guaranteed for volume production. SANYO believes information herein is accurate and reliable, but
no guarantees are made or implied regarding its use or any infringements of intellectual property rights
or other rights of third parties.
This catalog provides information as of October, 1996. Specifications and information herein are subject to
change without notice.
