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L387
VERY LOW DROP 5V REGULATOR WITH RESET
L387AVERY LOW DROP 5V REGULATOR WITH RESET PRECISE OUTPUT VOLTAGE(5V± 4%). VERY LOW DROPOUT VOLTAGE. OUTPUT CURRENTIN EXCESS OF 500mA. POWER-ON, POWER-OFF INFORMATION
(RESET FUNCTION). HIGH NOISE IMMUNITY ON RESET DELAY
CAPACITOR
ORDERING NUMBER: L387A
Pentawatt
The L387Aisa very low drop voltage regulatorin Pentawatt package specially designedto pro-
vide stabilized 5V suppliesin consumer and in-
dustrial applications. Thanksto its very low in-
put/output voltage drop this deviceis very useful battery powered equipment, reducing con-
sumption and prolonging battery life.A reset out-
put makes the L387A particularly suitable for mi-
croprocessor systems. This output providesa re-
set signal when poweris applied (afteran exter-
nal programmable delay) and goes low when
DESCRIPTIONpoweris removed, inhibiting the microprocessor. hysteresison reset delay capacitor raises the
immunityto the ground noise.
APPLICATION CIRCUIT
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit D.C. Input Voltage 35 V
Tj,Tstg Junction and Storage Temperature Range –55to 150 °C
PIN CONNECTION (Top views)thj-case Thermal ResistanceJunction-case Max 4 °C/W
THERMAL DATA
BLOCK DIAGRAM
L387A
ELECTRICAL CHARACTERISTICS (referto the test circuit, Vi= 14.4V, Tj =25 °C, Co= 100 μF;
unless otherwise specified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit Output Voltage Io=5 mAto 500 mATj =25°C
–40≤Tj≤ 125°C
5.25 Operating Input Voltage (*), Over FullT Range(–40to 125 °C)
(see note**) V
ΔVo Line Regulation Vi =6Vto26V Io =5 mA 5 50 mV
ΔVo Load Regulation Io=5 mAto 500 mA 15 60 mV –Vo Dropout Voltage VO =VO NOM– 100 mV= 350 mA= 500 mA
0.8 Quiescent Current Io =0 mA= 150 mA= 350 mA= 500 mA
160= 6.2V Io= 500 mA 160 180 mAVoT
Temperature Output
Voltage Drift 0.5 mV/°C
SVR Supply Voltage Rejection Io= 350 mA f= 120Hz= 100 μFVi =12V± 5Vpp
ISC Output Short Circuit
Current
1.2 1.6 A Reset Output Voltage IR=3 mA 1
Over FullT(–40°C≤Tj≤ 125 °C)
0.8 Reset Output Leakage
Currentin Regulation VR =5V
Over FullT Range μA Delay Timefor Reset
Output= 100nF
Over FullT Range ms
VRT(off) Vo@ Reset outHtoL Transition, Over
FullT Range
4.75 Vo 0.15
IC4 Charging Current
(current generator)=3V 102030 μA
VRT(on) Poweron
VoThreshold@ Reset outLtoH Transition, Over
FullT Range
VRT(off)
+0.05V
–0.04V Comparator Threshold
(pin4)@ Reset outHtoL Transition 3.2 3.9 V@ Reset outLtoH Transition 3.7 4.3 V Hysteresis Voltage Over FullT Range 450 mV
(*) ForaDC voltage26(**) Design limitsare guaranteed (butnot 100% production tested) over the indicated temperature and supply voltage ranges.
These limitsarenot usedto calculate outgoing quality levels.
L387A
Figure1: Dropout Voltage vs. Output Current. Figure2: Quiescent Current vs. Output
Current.
Figure3: Output Voltage vs. Temperature.
L387A
PENTAWATT PACKAGE MECHANICAL DATA
DIM. mm inch
MIN. TYP. MAX. MIN. TYP. MAX. 4.8 0.189 1.37 0.054 2.4 2.8 0.094 0.110 1.2 1.35 0.047 0.053 0.35 0.55 0.014 0.022 0.8 1.05 0.031 0.041 1 1.4 0.039 0.055 3.4 0.126 0.134 0.142 6.8 0.260 0.268 0.276 10.4 0.409 10.05 10.4 0.396 0.409 17.85 0.703 15.75 0.620 21.4 0.843 22.5 0.886 2.6 3 0.102 0.118 15.1 15.8 0.594 0.622 6 6.6 0.236 0.260 4.5 0.177 4 0.157
Dia 3.65 3.85 0.144 0.152L5
Dia.
L387A
Information furnishedis believedtobe accurate and reliable. However, SGS-THOMSON Microelectronics assumesno responsibilityfor
the consequencesof useof such informationnorforany infringementof patentsor other rightsof third parties which may result fromits
use.No licenseis grantedby implicationor otherwise under any patentor patent rightsof SGS-THOMSON Microelectronics. Specifica-
tions mentionedin this publicationare subjectto change without notice. This publication supersedes and replacesall information pre-
viously supplied. SGS-THOMSON Microelectronics productsarenot authorizedfor useas critical componentsinlife support devicesor
systems without express written approvalof SGS-THOMSON Microelectronics.
PENTAWATTis registered trademarks ofSGS-THOMSON Microelectronics 1994 SGS-THOMSON Microelectronics-All Rights Reserved
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L387A
