Datasheet

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L4963

L4963D

1.5A SWITCHING REGULATOR

This is advanced information on a new product now in development or underogin evaluation. Details are subject to change without notice.

1.5A OUTPUT LOAD CURRENT

5.1 TO 36V OUTPUT VOLTAGE RANGE

DISCONTINUOUS VARIABLE FREQUENCY

MODE

PRECISE (+/–2%) ON CHIP REFERENCE

VERY HIGH EFFICIENCY

VERY FEW EXTERNAL COMPONENTS

NO FREQ. COMPENSATION REQUIRED

RESET AND POWER FAIL OUTPUT FOR MI-

CROPROCESSOR

INTERNAL CURRENT LIMITING

THERMAL SHUTDOWN

DESCRIPTION

The L4963 is a monolithic power switching regulator

delivering 1.5A at 5.1V. The output voltage is adjust-

able from 5.1V to 36V, working in discontinuous

variable frequency mode. Features of the device

include remote inhibit, internal current limiting and

thermal protection, reset and power fail outputs for

microprocessor.

BLOCK DIAGRAM

Powerdip12+3+3

SO20

ORDERING NUMBERS:

L4963W L4963D

The L4963 is mounted in a 12+3+3 lead Powerdip

(L4963) and SO20 large (L4963D) plastic pack-

ages and requires very few external components.

June 2000

1/17

Summary of content (17 pages)

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L4963 L4963D ® 1.5A SWITCHING REGULATOR 1.5A OUTPUT LOAD CURRENT 5.1 TO 36V OUTPUT VOLTAGE RANGE DISCONTINUOUS VARIABLE FREQUENCY MODE PRECISE (+/–2%) ON CHIP REFERENCE VERY HIGH EFFICIENCY VERY FEW EXTERNAL COMPONENTS NO FREQ. COMPENSATION REQUIRED RESET AND POWER FAIL OUTPUT FOR MICROPROCESSOR INTERNAL CURRENT LIMITING THERMAL SHUTDOWN Powerdip12+3+3 SO20 ORDERING NUMBERS: DESCRIPTION The L4963 is a monolithic power switching regulator delivering 1.5A at 5.1V.
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L4963 - L4963D ABSOLUTE MAXIMUM RATINGS Symbol Value Unit Input Voltage (pin 1 and pin 3 connected togheter) 47 V Input to Output Voltage Difference 47 V V2 Negative Output DC Voltage –1 V V2 Negative Output Peak Voltage at t=0.2 µs, f=50kHz –5 V Power Fail Input 25 V Reset and Power Fail Output Vi Reset Delay Input 5.
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L4963 - L4963D PIN FUNCTIONS SO20L Power DIP Name Description 1 1 SIGNAL SUPPLY VOLTAGE Must be Connected to pin 3 2 2 OUTPUT Regulator output 3 3 SUPPLY VOLTAGE Unregulated voltage input. An internal regulator powers the internal logic. 4, 5, 6, 7 14, 15, 16, 17 4, 5, 6 13, 14, 15 GROUND Common ground terminal 8 7 POWER FAIL INPUT Input of the power fail circuit. The threshold can be modified introducing an external voltage divider between the Supply Voltage and GND.
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L4963 - L4963D CIRCUIT DESCRIPTION (Refer to Block Diagram) The L4963 is a monolithic stepdown regulator providing 1.5A at 5.1V working in discontinuous variable frequency mode. In normal operation the device resonates at a frequency depending primarily on the inductance value, the input and output voltage and the load current. The maximum switching however can be limited by an internal oscillator, which can be programmed by only one external resistor.
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L4963 - L4963D ELECTRICAL CHARACTERISTIC (Refer to the test circuit Vi = 30V Tj = 25°C unless otherwise specified ) Symbol Parameter Test Conditions Min. Typ. Max. Unit Fig. Vref 36 V 2 46 V 2 5.1 5.2 V 2 5 20 µA 3a 5 10 mV 3a DYNAMIC CHARACTERISTICS Vo Output Voltage Range Vi = 46V Io = 0.5A Vi Input Voltage Range Vo = Vref to 36V Io = 0.5A 9 V12 Feedback Voltage Vi = 9 to 46V Io = 0.
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L4963 - L4963D ELECTRICAL CHARACTERISTIC (Continued) Symbol Parameter Test Conditions Min. Typ. Max. Unit Fig. RESET V12 Rising Threshold Voltage Vi = 9 to 46V Vref –150 Vref –100 Vref –50 mV 3b V12 Falling Threshold Voltage Vi = 9 to 46V Vref –150 Vref –200 Vref –250 mV 3b V9D Delay Rising Thereshold Voltage V7 = OPEN 4.3 4.5 4.7 V 3b V9F Delay Falling Thereshold Voltage 1 1.5 2 V 3b 110 140 µA 3b Delay Source Current V9 = 4.7V V12 = 5.
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L4963 - L4963D Figure 2: Test Circuit Figure 3: DC Test Circuit Figure 3a Figure 3b 7/17
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L4963 - L4963D Figure 3c Figure 4: Quiescent Drain Current vs. Supply Voltage (0% Duty Cycle) Figure 5: Quiescent Drain Current vs. Supply Voltage (100% Duty Cycle) Figure 6: Quiescent Drain Current vs. Junction Temperature (0% Duty Cycle) Figure 7: Quiescent Drain Current vs.
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L4963 - L4963D Figure 8: Reference Voltage vs. Vi Figure 9: Reference Voltage vs. Tj Figure 10: Line Transient Response Figure 11: Load Transient Figure 12: Supply Voltage Ripple Rejection vs. Frequency Figure 13: Dropout Voltage Between pi3 and 2 vs.
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L4963 - L4963D Figure 14: Dropout Voltage Between pin3 and 2 vs. Junction Temperature Figure 15: Maximum Allowable PowerDissipation vs. Ambient Temperature (Powerdip Package Only) Figure 16: Power Dissipation (device only) vs. Input Voltage (Powerdip Package Only) Figure 17: Power Dissipation (device only) vs. Output Voltage (Powerdip Package Only) Figure 18: Voltage and Current Waveform at pin2 Figure 19: Efficiency vs.
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L4963 - L4963D Figure 20: Efficiency vs. Output Voltage (Powerdip Package Only) Figure 21: Current Limit vs. Junction Temperature Vi = 30V Figure 22: Current Limit vs. Input Voltage Figure 23: Oscillator Frequency vs. R2 (see fig. 26) Figure 24: Oscillator Frequency vs. Junction Temperature Figure 25: Oscillator Frequency vs.
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L4963 - L4963D Figure 26: Evaluation Board Circuit PART LIST CAPACITOR Resistor Values for Standard Output Voltages C1 1000µF 50V EKR (*) VO R6 R5 C2 2.2mF 16V 12 4.7KΩ 6.2KΩ C3 1000µF 40V with low ESR 15 4.7KΩ 9.1KW C4 1µF 50V film 18 4.7KΩ 12KW 24 4.7KΩ 18KW RESISTOR R1 1KΩ R2 51KΩ R3 1KΩ R4 1KΩ R5, R6 Diode: BYW98 Core: L = 40µH Magnetics 58121-A2MPP 34 Turns 0.
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L4963 - L4963D Figure 27: P.C. Board and Component Layout of the Circuit of fig. 26 (Powerdip Package) (1:1 scale). Figure 28: Thermal Characteristics Figure 29: Junction to Ambient Thermal Resistance vs.
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L4963 - L4963D Figure 30: A Minimal 5.
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L4963 - L4963D mm DIM. MIN. a1 0.51 B 0.85 b b1 TYP. inch MAX. MIN. TYP. MAX. 0.020 1.40 0.033 0.50 0.38 0.055 0.020 0.50 D 0.015 0.020 24.80 0.976 E 8.80 0.346 e 2.54 0.100 e3 20.32 0.800 F 7.10 0.280 I 5.10 0.201 L OUTLINE AND MECHANICAL DATA 3.30 0.130 Powerdip 18 Z 2.54 0.
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L4963 - L4963D mm inch OUTLINE AND MECHANICAL DATA DIM. MIN. TYP. MAX. MIN. TYP. MAX. A 2.35 2.65 0.093 0.104 A1 0.1 0.3 0.004 0.012 B 0.33 0.51 0.013 0.020 C 0.23 0.32 0.009 0.013 D 12.6 13 0.496 0.512 E 7.4 7.6 0.291 0.299 e 1.27 0.050 H 10 10.65 0.394 0.419 h 0.25 0.75 0.010 0.030 L 0.4 1.27 0.016 0.050 SO20 K 0˚ (min.)8˚ (max.
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L4963 - L4963D Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are subject to change without notice.