ULDO LINEAR REGULATORS FAMILY OUTPUT CURRENT PRECISE OUTPUT VOLTA
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L4955
ULDO LINEAR REGULATORS FAMILY
OUTPUT CURRENT PRECISE OUTPUT VOLTAGES FAST TRANSIENT RESPONSE 0.75V TYP. DROP VOLTAGE OPERATING INPUT VOLTAGE FROM 4.5V ADJUSTABLE VERSION: 1.26V INHIBIT 120µA TYP.) POWER GOOD PROGRAMMABLE CURRENT LIMIT HEPTAWATT PACKAGE FIXED VERSION: 3.3V, 5.1V OUTPUTS VERSAWATT PACKAGE VERY QUIESCENT CURRENT SHORT CIRCUIT PROTECTION (Foldback function) THERMAL SHUTDOWN APPLICATIONS PENTIUMAND POWER PCSUPPLIES POST REGULATOR SMPS COST SOLUTION 3.3V CONVERSION COST BATTERY CHARGER CONSTANT CURRENT REGULATOR SUITABLE APPLICATION WITH STANDBY FEATURE DESCRIPTION L4955 family monolithic ultra very drop linear regulators designed supply most recent microprocessors. TYPICAL APPLICATIONS
VOUT
MULTIPOWER TECHNOLOGY
HEPTAWATT ORDERING NUMBERS L4955 L4955V3.3 L4955V5.1 OUTPUT VOLTAGE 1.26V 3.3V 5.1V
VERSAWATT (TO-220) PACKAGE HEPTAWATT VERSAWATT VERSAWATT
dropout voltage only 0.75V (Typ.) directly dependent output current conditions. Realized BCDII technology, board charge pump properly drive N-channel power Transistor with 150m RDSON. operates from 4.5V minimum supply, with very quiescent current irrespective load; minimum 22µF output capacitor required stability. on-chip trimming techniques improve precision available output voltages ±2%. Ancillary functions like power good, inhibit with power consumption, programmable output voltage current limiting make flexible heptawatt version usable applications where power management, stand-by, features, post regulation adjustable current generators battery chargers important.
L4955
L4955VXXX
VOUT
D97IN590
D97IN589
February 1999
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L4955
ABSOLUTE MAXIMUM RATINGS
Symbol Supply Input Voltage pins pins PTOT Tst, Power Dissipation Tamb 50°C Power Dissipation Tcase 90°C Storage Temperature Parameter Value -0.3 +150 Unit
CONNECTIONS (Top views)
connected
D96IN367
D96IN369
HEPTAWATT
VERSAWATT (TO220)
BLOCK DIAGRAM
10µF
1(1) VREF= 1.26V FIXED C.L. CHARGE PUMP
FOLDBACK
REGULATOR
PROGRAM. C.L.
BUFFER
POWER DMOS 150m 7(3) VOUT 22µF
THERMAL SHUTDOWN
VREF HEPTAWATT VERSAWATT (1/4W, 4(2) 0.9V
D96IN366
1.26V INHIBIT ACTIVE HIGH
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L4955
FUNCTIONS
Name Function Unregulated input voltage; this must bypassed with capacitor larger than 10µF. resistor connected between this ground sets programmable current limiting value. When programmable current limiting used must connected GND. TTL-CMOS input. logic high level this input disables device. internal pull-down insures full functionally even open. Ground. output connected directly this terminal 1.26V operation; connected output through resistive divider higher voltages. Open drain output, this signal when output voltage lower than 90%, otherwise high. Regulated output voltage. minimum bypass capacitor 22µF required insure stability.
THERMAL DATA (HEPTAWATT VERSAWATT packages)
Symbol j-case j-amb Parameter Thermal Resistance Junction-case Thermal Resistance Junction-ambient Thermal Shutdown Thermal Hysteresis Max. Max. Typ. Typ. Value Unit °C/W °C/W
L4955 ELECTRICAL CHARACTERISTICS 25°C, 12V, unless otherwise specified). Specifications referred from +125°C.
Symbol Parameter Operating Supply Voltage Output Voltage Line regulation Dropout Voltage 0.1A 4.5V <12V 4.5V 12V; 0.1A 4.5V <22V; 10mA 0.1A 4.5V Current Limiting Short Circuit Current Programmable Current Limiting Quiescent Current Stand Current Inhibit Threshold Inhibit Hysteresis Inhibit Bias Sink Current Power Good Threshold Power Good Hysteresis Power Good Saturation Ripple Rejection
Output voltage connected ADJ.
Test Condition
Min. 1.235 1.222
Typ. 1.26 1.26 0.75 0.55
Max. 1.285 1.298 0.75 3.45 1.00 1.42
Unit
Load regulation
Rlim Rlim 0.1A Rising Edge 0.8V Rising Edge 120Hz, 2VPP
2.55 0.70
0.85
1.26
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L4955
L4955V3.3 ELECTRICAL CHARACTERISTICS 25°C, unless otherwise specified) Specifications referred from +125°C.
Symbol Parameter Operating Input Voltage Output Voltage 4.75V 12V; 0.1A 4.75V 12V; 0.1A Line regulation Load regulation Current Limiting Short Circuit Current Quiescent Current Ripple Rejection 0.1A 120Hz, 2VPP 4.5V <12V; 10mA 0.1A Test Condition Min. 3.234 3.300 3.300 Typ. Max. 3.366 3.399 Unit
3.201
L4955V5.1 ELECTRICAL CHARACTERISTICS 25°C, unless otherwise specified) Specifications referred from +125°C.
Symbol Parameter Operating Input Voltage Output Voltage 6.75V 15V; 0.1A 6.75V 15V; 0.1A Drop-out Voltage Test Condition Min. VO+VD 5.000 5.100 5.100 0.75 Typ. Max. 5.200 5.250 0.75 Unit
4.950
0.55
Line regulation Load regulation Current Limiting Short Circuit Current Quiescent Current Ripple Rejection 0.1A 120Hz, 2VPP 6.5V <15V; 10mA 0.1A
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L4955
L4955 Figure L4955 Operating Area
tput rent perating 70°C 12.5 17.5 22.5 dson sipation 25°C itation 4.5V 125°C
Figure Output Voltage Stability Junction Temperature
Figure Line Regulation Junction Temperature
Figure Load Regulation
Deviation
Voltage
Output
utput Voltage
eviation
Figure Dropout Voltage
Figure Maximum OutputCurrent Junction Temperaturewith internalcurrent limiting
utput urrent
(Vin-Vout)
[°C]
ulsed tecnique been used
5/14
L4955
L4955 Figure Short-circuit Current Junction Temperature with Programmable Current Limiting
Figure Quiescent Current Temperature
Figure Quiescent Current Supply voltage
Figure Quiescent Current Supply Voltage with Programmable Current Limiting
[mA] 25°C
Rlim
Figure Stand-by Current Supply Voltage with LOGIC HIGH
Figure Ripple Rejection Frequency
1.26
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L4955
L4955 Figure Ripple Rejection Output Current
High
Figure Power Good Function
VADJ VOUT=VADJ (R1+R2)/R2
VADJ hyst 200mV
D96IN364B
Figure Inhibit Function
VINH
Vref 1.26V hyst 200mV
regulator
regulator
regulator
D96IN365A
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L4955
LINE TRANSIENT RESPONSE Figure
Figure
Figure
Test condition: 12V; 3.3V; 200mA; 10µF (electrolytic capacitor); Cout 22µF (electrolytic capacitor); dV/dt V/µs; 25°C
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L4955
LOAD TRANSIENT RESPONSE Figure Figure
Figure
Test condition: VOUT 3.3V; Load Transient from 0.5A
dIout 25°C
Figure Load transient test circuit.
100µF/10V each each VOUT 3.3V
L4955
C1,C2 470µF/25V Panasonic
D97IN546
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L4955
L4955V3.3 Figure operating area.
utput Current
Figure Output Voltage Stability Junction Temperature.
Current itation
Vout 3.3V 125°C
Power Dissipation Rdson 25°C ax=40W
perating Area
c=70°C ax=22W
10.5 13.5 16.5 19.5 22.5
Input Voltage
Figure Quiescent Current Temperature.
Figure Load Regulation
Output Voltage Deviation [mV] Vin=5V (Pulsed tecnique been used) Iout
Figure Line regulation Junction Temperature.
Output Voltage Deviation [mV]
Figure MaximumOutput Current vs.Junction Temperaturewith internalcurrent limiting
utput urrent [°C] (Vin-Vout)
ulsed tecnique been used
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L4955
L4955V5.1 Figure operating area.
itatio ratin issip 5.1V
Figure Output Voltage Stability Junction Temperature.
Vout 5.15 Iout
5.05
4.95
Figure Quiescent Current Temperature.
[mA]
Figure Load Regulation
Output Voltage Deviation [mV]
[°C] Iout 10mA
Figure Line regulation Junction Temperature.
Output Voltage Deviation [mV] [°C] 6.5V Iout 10mA
Figure Maximum OutputCurrent Junction Temperaturewith internalcurrent limiting
utput urrent [°C] (Vin-Vout)
ulsed tecnique been used
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L4955
DIM. TYP. inch TYP.
MIN.
0.35 2.34 4.88 7.42 10.05 16.7 21.24 22.27 15.1 2.55 4.83 3.65 2.54 5.08 7.62
16.9 14.92 21.54 22.52 15.5 6.35 5.08
MAX. 1.37 1.35 0.55 0.97 2.74 5.28 7.82 10.4 10.4 17.1 21.84 22.77 1.29 15.8 3.05 5.33 3.85
MIN.
0.094 0.047 0.014 0.028 0.024 0.095 0.193 0.295 0.396 0.657 0.386 0.877 0.102 0.594 0.236 0.100 0.190 (typ.) 0.144 0.100 0.200 0.300
0.668 0.587 0.848 0.891 0.110 0.610 0.250 0.008 0.110 0.200
MAX. 0.189 0.054 0.110 0.053 0.022 0.038 0.031 0.035 0.105 0.205 0.307 0.409 0.409 0.673 0.860 0.896 0.051 0.118 0.622 0.260 0.120 0.210 0.152
OUTLINE MECHANICAL DATA
Heptawatt
Dia.
HEPTAMEC
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L4955
MIN. 3.75 13.0 2.65 15.25 6.20 3.50 3.85 0.147 4.40 1.23 2.40 0.49 0.61 1.14 1.14 4.95 2.40 10.0 16.4 14.0 2.95 15.75 6.60 3.93 0.511 0.104 0.600 0.244 0.137 0.102 0.151 TYP. MAX. 4.60 1.32 2.72 0.70 0.88 1.70 1.70 5.15 2.70 10.4 MIN. 0.173 0.048 0.094 0.019 0.024 0.044 0.044 0.194 0.094 0.393 0.645 0.551 0.116 0.620 0.260 0.154 inch TYP. MAX. 0.181 0.051 0.107 0.027 0.034 0.067 0.067 0.203 0.106 0.409
DIM.
OUTLINE MECHANICAL DATA
Versawatt (TO220)
TO220MEC
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L4955
Information furnished believed accurate reliable. However, STMicroelectronics assumes responsibility consequences such information infringement patents other rights third parties which result from use. license granted implication otherwise under patent patent rights STMicroelectronics. Specification mentioned this publication subject change without notice. This publicationsupersedes replaces information previously supplied. STMicroelectronics products notauthorizedfor critical components life support devices systems without express writtenapproval STMicroelectronics. logois registered trademark STMicroelectronics 1999 STMicroelectronics Printed Italy Rights Reserved STMicroelectronics GROUP COMPANIES Australia Brazil Canada China France Germany Italy Japan Korea Malaysia Malta Mexico Morocco Netherlands Singapore Spain Sweden Switzerland Taiwan Thailand United Kingdom U.S.A. http://www.st.com
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