1.5A SWITCHING REGULATOR 1.5A OUTPUT LOAD CURRENT OUTPUT VOLTAGE

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1.5A SWITCHING REGULATOR 1.5A OUTPUT LOAD CURRENT OUTPUT VOLTAGE

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L4963 L4963D
1.5A SWITCHING REGULATOR
1.5A OUTPUT LOAD CURRENT OUTPUT VOLTAGE RANGE DISCONTINUOUS VARIABLE FREQUENCY MODE PRECISE (+/-2%) CHIP REFERENCE VERY HIGH EFFICIENCY VERY EXTERNAL COMPONENTS FREQ. COMPENSATION REQUIRED RESET POWER FAIL OUTPUT MICROPROCESSOR INTERNAL CURRENT LIMITING THERMAL SHUTDOWN
Powerdip12+3+3
SO20
ORDERING NUMBERS:
DESCRIPTION L4963 monolithic power switching regulator delivering 1.5A 5.1V. output voltage adjustable from 5.1V 36V, working discontinuous variable frequency mode. Features device include remote inhibit, internal current limiting thermal protection, reset power fail outputs microprocessor. BLOCK DIAGRAM
L4963W
L4963D
L4963 mounted 12+3+3 lead Powerdip (L4963) SO20 large (L4963D) plastic packages requires very external components.
June 2000
This advanced information product development underogin evaluation. Details subject change without notice.
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L4963 L4963D
ABSOLUTE MAXIMUM RATINGS
Symbol SO20 V3-V2 Ptot V12, V17, Powerdip Input Voltage (pin connected togheter) Input Output Voltage Difference Negative Output Voltage Negative Output Peak Voltage t=0.2 f=50kHz Power Fail Input Reset Power Fail Output Reset Delay Input Feedback Inhibit Inputs Oscillator Inputs Total Power Dissipation Tpins 90°C (Power DIP) (Tamb 70°C copper area PCB) (Tamb 70°C, copper area PCB) Storage Junction Temperature (Tamb 70°C copper area PCB) Total Power Dissipation Tpins 90°C (SO20L) 1.45 Parameter Value Unit
Tstg, Ptot
CONNECTION (top view)
Powerdip18
SO20
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FUNCTIONS
SO20L Power Name SIGNAL SUPPLY VOLTAGE OUTPUT SUPPLY VOLTAGE GROUND Description Must Connected Regulator output Unregulated voltage input. internal regulator powers internal logic. Common ground terminal Input power fail circuit. threshold modified introducing external voltage divider between Supply Voltage GND. Open collector power fail signal output. This output high when supply voltage safe. capacitor connected between this terminal ground determines reset signal delay time. Open collector reset signal output. This output high when output voltage value correct. Reference voltage output. Feedback terminal regulation loop. output connected directly this terminal 5.1V operation; connected divider higher voltages. level remote inhibit. logic level this input disables device. Oscillator waveform. capacitor connected between this terminal ground modifies maximum oscillator frequency. resistor connected between this terminal ground defines maximum switching frequency.
POWER FAIL INPUT
POWER FAIL OUTPUT RESET DELAY RESET OUTPUT REFERENCE VOLTAGE
FEEDBACK INPUT
INHIBIT INPUT
OSCILLATOR
OSCILLATOR FREQ.
THERMAL DATA
Symbol j-pins j-amb
Fig.
Parameter Thermal Resistance Junction Pins Thermal Resistance Junction Ambient max. max.
SO20
Powerdip
Unit °C/W °C/W
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L4963 L4963D
CIRCUIT DESCRIPTION (Refer Block Diagram) L4963 monolithic stepdown regulator providing 1.5A 5.1V working discontinuous variable frequency mode. normal operation device resonates frequency dependingprimarily inductance value, input output voltage load current. maximum switching however limited internal oscillator, which programmed only external resistor. fondamental regulation loop consists comparators, precision 5.1V on-chip reference drive latch. Briefly operation follows: when choke ends discharge catch freewheeling recirculation filter diode begins come forward conduction output voltage device approaches ground. When output voltage reaches -0.1V internal comparator sets latch power stage turned Then inductor current rises linearly until voltage sensed feedback input reaches 5.1V reference. second comparator then resets latch output stage turned off. current choke falls linearly until fully discharged, then cycle repeats. Closing loop directly gives output voltage 5.1V. Higher output voltages Figure Reset Power Fail Function obtained inserting voltage divider this method control requires frequency compensation network. output voltages greater than 5.1V available output current must derated increased power dissipation device. Output overload protection provided internal current limiter. load current sensed on-chip metal resistor connected comparator which resets latch turns powerstage overload condition. reset circuits (see fig. generates output high signal when output voltage value correct. open collector output output signal delay time programmed with external capacitor. powerfail circuit also available used monitor supply voltage. output goes high when supply voltage reaches pre-programmedtreshold voltage divider input from supply ground. With input left open threshold approximately equal 5.1V. output power fail open collector. level inhibit provided applications such remote on/off control. This input activated logic level disables circuits operation. thermal overload circuit disables device when junction temperature about 150°C hysteresis prevent unstable conditions.
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ELECTRICAL CHARACTERISTIC (Refer test circuit 25°C unless otherwise specified
Symbol Parameter Test Conditions Min. Typ. Max. Unit Fig.
DYNAMIC CHARACTERISTICS
VOS12 Output Voltage Range Input Voltage Range Feedback Voltage Input Bias Current Input Offset Voltage Line Regulation Load Regulation Dropout Voltage Between Current Limiting Maximum Operating Load Current Supply Voltage Ripple Rejection Reference Voltage Average Temperature Coefficient Ref. Volt. Vref Line Regulation Vref Line Regulation Efficiency Thermal Shutdown Junction Temperature Hysteresis Vref 0.5A Vref 1.5A Vref Vref 2Vrms Vref fripple 100Hz 1.5A Iref Rosc 1.5A Vref 0.5A Vref 0.5A 0.5A V17f Vref mV/°C
CHARACTERISTICS
Quescent Drain Current Vref 5.3V
INHIBIT
V16L V16H I16L I16L Input Voltage High Input Voltage Input Current with Input Voltage Input Current with High Input Voltage 0.8V
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L4963 L4963D
ELECTRICAL CHARACTERISTIC (Continued)
Symbol Parameter Test Conditions Min. Typ. Max. Unit Fig.
RESET
-I9SO I9SI Rising Threshold Voltage Falling Threshold Voltage Delay Rising Thereshold Voltage Delay Falling Thereshold Voltage Delay Source Current Delay Sink Current Output Leakage Current Output Saturation Volt. 4.7V 5.3V 4.7V 4.7V 8.5V 15mA; OPEN Vref -150 Vref -150 Vref -100 Vref -200 Vref Vref -250
POWER FAIL
Rising Threshold Voltage Falling Threshold Voltage Rising Threshold Voltage Falling Threshold Voltage Output Saturation Volt. Output Leakage Current Pin7 open Pin7 open 17.5 14.25 4.14 3.325 20.5 15.75 4.86 3.675
OSCILLATOR
Oscillator Frequency Oscillator Frequency 125°C
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L4963 L4963D
Figure Test Circuit
Figure Test Circuit Figure
Figure
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L4963 L4963D
Figure
Figure Quiescent Drain Current Supply Voltage Duty Cycle)
Figure Quiescent Drain Current Supply Voltage (100% Duty Cycle)
Figure Quiescent Drain Current Junction Temperature Duty Cycle)
Figure Quiescent Drain Current Junction Temperature (100% Duty Cycle)
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L4963 L4963D
Figure Reference Voltage Figure Reference Voltage
Figure Line Transient Response
Figure Load Transient
Figure Supply Voltage Ripple Rejection Frequency
Figure Dropout Voltage Between Current pin2
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L4963 L4963D
Figure Dropout Voltage Between pin3 Junction Temperature Figure Maximum Allowable PowerDissipation Ambient Temperature (Powerdip Package Only)
Figure Power Dissipation (device only) Input Voltage (Powerdip Package Only)
Figure Power Dissipation (device only) Output Voltage (Powerdip Package Only)
Figure Voltage Current Waveform pin2
Figure Efficiency Output Current (Powerdip Package Only)
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L4963 L4963D
Figure Efficiency Output Voltage (Powerdip Package Only) Figure Current Limit Junction Temperature
Figure Current Limit Input Voltage
Figure Oscillator Frequency (see fig.
Figure Oscillator Frequency Junction Temperature
Figure Oscillator Frequency Input Voltage
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L4963 L4963D
Figure Evaluation Board Circuit
PART LIST
CAPACITOR 1000µF 2.2mF 1000µF with film RESISTOR table Resistor Values Standard Output Voltages 4.7K 4.7K 4.7K 4.7K 6.2K 9.1KW 12KW 18KW
Diode: BYW98 Core: 40µH Magnetics58121-A2MPP34 Turns 0.9mm (20AWG)
Minimum 100µF preregulated offline SMPS output 1000µF 50Hz transformer plus rectifiers used.
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Figure P.C. Board Component Layout Circuit fig. (Powerdip Package) (1:1 scale).
Figure Thermal Characteristics
Figure Junction Ambient Thermal Resistance Area Board Heatsink (SO20)
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L4963 L4963D
Figure Minimal Fixed Regulator Very Components Required
Figure Minimal Components count
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L4963 L4963D
MIN. 3.30 2.54 8.80 2.54 20.32 7.10 5.10 0.130 0.100 0.38 0.51 0.85 0.50 0.50 24.80 0.346 0.100 0.800 0.280 0.201 0.015 1.40 TYP. MAX. MIN. 0.020 0.033 0.020 0.020 0.976 0.055 inch TYP. MAX.
DIM.
OUTLINE MECHANICAL DATA
Powerdip
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L4963 L4963D
MIN. 0.25 2.35 0.33 0.23 12.6 1.27 10.65 0.75 1.27 0.394 0.010 0.016 TYP. MAX. 2.65 0.51 0.32 MIN. 0.093 0.004 0.013 0.009 0.496 0.291 0.050 0.419 0.030 0.050 inch TYP. MAX. 0.104 0.012 0.020 0.013 0.512 0.299
DIM.
OUTLINE MECHANICAL DATA
SO20
(min.)8° (max.)
SO20MEC
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L4963 L4963D
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 publication supersedes replaces information previously supplied. STMicroelectronics products authorized critical components life support devices systems without express written approval STMicroelectronics. logo registered trademark STMicroelectronics 2000 STMicroelectronics Printed Italy Rights Reserved STMicroelectronics GROUP COMPANIES Australia Brazil China Finland France Germany Hong Kong India Italy Japan Malaysia Malta Morocco Singapore Spain Sweden Switzerland United Kingdom U.S.A. http://www.st.com
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1.5A SWITCHING REGULATOR 1.5A OUTPUT LOAD CURRENT OUTPUT VOLTAGE

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