UA78S40 ONSEMI | Alldatasheet

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µ/C0065/C0055/C0056/C0083/C0052/C0048 SEMICONDUCTOR TECHNICAL DATA UNIVERSAL SWITCHING REGULATOR SUBSYSTEM

ORDERING INFORMATION

µA78S40PC µA78S40PV TA = 0° to +70°C TA = – 40° to +85°C Plastic Plastic PIN CONNECTIONS Order this document µA78S40/D P SUFFIX PLASTIC PACKAGE CASE 648 (Top View) Diode Anode Reference Inv. Input Noninv. VCC Op Amp Op Amp Output Switch Emitter Diode Cathode Op Amp Comparator Noninv. Input Comparator Inv. Input Ground Timing Capacitor VCC Ipk Sense Driver Collector Switch Collector 1MOTOROLA ANALOG IC DEVICE DATA /C0085/C0110/C0105/C0118/C0101/C0114/C0115/C0097/C0108 /C0083/C0119/C0105/C0116/C0099/C0104/C0105/C0110/C0103 /C0082/C0101/C0103/C0117/C0108/C0097/C0116/C0111/C0114 /C0083/C0117/C0098/C0115/C0121/C0115/C0116/C0101/C0109 The µ A78S40 is a switching regulator subsystem, consisting of a temperature compensated voltage reference, controlled–duty cycle oscillator with an active current limit circuit, comparator, high–current and high–voltage output switch, capable of 1.5 A and 40 V, pinned–out power diode and an uncommitted operational amplifier, which can be powered up or down independent of the IC supply. The switching output can drive external NPN or PNP transistors when voltages greater the 40 V, or currents in excess of 1.5 A, are required. Some of the features are wide–supply voltage range, low standby current, high efficiency and low drift. The µA78S40 is available in commercial (0° to + 70°C), and automotive (–40° to + 85°C) temperature ranges. Some of the applications include use in step–up, step–down, and inverting regulators, with extremely good results obtained in battery– operated systems.

  • Output Adjustable from 1.25 V to 40 V
  • Peak Output Current of 1.5 A Without External Transistor
  • 80 dB Line and Load Regulation
  • Operation from 2.5 V to 40 V Supply
  • Low Standby Current Drain
  • High Gain, High Output Current, Uncommitted Op Amp Simplified Block Diagram C T Ipk Oscilator +Comp. Op1.25V Reference S R Q 170 (Bottom View) Ref Output Output Inv Input Noninv Input VCC Op Amp Switch Emitter Diode Anode Diode Cathode Noninv. Input Inv. Input Gnd Timing Capacitor VCC Ipk Sense Driver Collector Switch Collector 765432 1 10 11 12 13 14 15 16 Amp  Motorola, Inc. 1996 Rev 1

µA78S40

2 MOTOROLA ANALOG IC DEVICE DATA

Power Supply Voltage VCC 40 V Op Amp Power Supply Voltage VCC (Op Amp) 40 V Common Mode Input Range (Comparator and Op Amp) VICR –0.3 to VCC V Differential Input Voltage (Note 2) VID ± 30 V Output Short Circuit Duration (Op Amp) Continuous – Reference Output Current Iref 10 mA Voltage from Switch Collectors to Gnd 40 V Voltage from Switch Emitters to Gnd 40 V Voltage from Switch Collectors to Emitter 40 V Voltage from Power Diode to Gnd 40 V Reverse–Power Diode Voltage VDR 40 V Current through Power Switch ISW 1.5 A Current through Power Diode ID 1.5 A Power Dissipation and Thermal Characteristics: Plastic Package (TA = + 25°C) Derate above + 25°C (Note 1) PD 1/RθJA 1500 mW mW/ °C Storage Temperature Range Tstg –65 to + 150 °C Operating Temperature Range µA78S40V µA78S40C TA –40 to +85 0 to +70 NOTES: 1. Tlow = –40 ° for µA78S40PV T high= +85° for µA78S40PV =0 ° for µA78S40PC = +70 ° for µA78S40PC 2. For supply voltages less than 30 V the maximum differential input voltage (Error Amp and Op Amp) is equal to the supply voltage. ELECTRICAL CHARACTERISTICS (VCC = VCC (Op Amp) 5.0 V, TA = Tlow to Thigh, unless otherwise noted.) Characteristic Symbol Min Typ Max Unit GENERAL Supply Voltage VCC 2.5 – 40 V Supply Current (Op Amp VCC , disconnected) (VCC = 5.0 V) (VCC = 40 V) ICC 1.8 2.3 3.5 5.0 mA Supply Current (Op Amp VCC , connected) (VCC = 5.0 V) (VCC = 40 V) ICC 4.0 5.5 mA REFERENCE Reference Voltage (Iref = 1.0 mA) Vref 1.180 1.245 1.310 V Reference Voltage Line Regulation (3.0 V≤ VCC ≤ 40 V, Iref = 1.0 mA, TA = 25°C) Reg line – 0.04 0.2 mV/V Reference Voltage Load Regulation (1.0 mA≤ Iref≤ 10 mA, TA = 25°C) Reg load – 0.2 0.5 mV/mA

µA78S40 3MOTOROLA ANALOG IC DEVICE DATA ELECTRICAL CHARACTERISTICS (VCC = VCC (Op Amp) 5.0 V, TA = Tlow to Thigh, unless otherwise noted.) Characteristic Symbol Min Typ Max Unit OSCILLATOR Charging Current (TA = 25°C) (VCC = 5.0 V) (VCC = 40 V) Ichg µA Discharging Current (TA = 25°C) (VCC = 5.0 V) (VCC = 40 V) Idis 150 150 250 350 µA Oscillator Voltage Swing (TA = 25°C) (VCC = 5.0 V) Vosc – 0.5 – V Ratio of Charge/Discharge Time tchg/tdis – 6.0 – – CURRENT LIMIT Current–Limit Sense Voltage (TA = 25°C) (VCC – Vlpk Sense) VCLS 250 – 350 mV OUTPUT SWITCH Output Saturation Voltage 1 (ISW = 1.0 A, Pin 15 tied to Pin 16) Vsat1 – 0.93 1.3 V Output Saturation Voltage 2 (ISW = 1.0 A, I15 = 50 mA) Vsat2 – 0.5 0.7 V Output Transistor Current Gain (TA = 25°C) (IC = 1.0 A, VCE = 5.0 V) hFE – 70 – – Output Leakage Current (TA = 25°C) (VCE = 40 V) IC(off) – 10 – nA POWER DIODE Forward Voltage Drop (ID = 1.0 A) VD – 1.25 1.5 V Diode Leakage Current (TA = 25°C) (VDR = 40 V) IDR – 10 – nA COMPARATOR Input Offset Voltage (VCM = Vref) VIO – 1.5 15 mV Input Bias Current (VCM = Vref) IIB – 35 200 nA Input Offset Current (VCM = Vref) IIO – 5.0 75 nA Common Mode Voltage Range (TA = 25°C) VICR 0 – VCC – 2.0 V Power–Supply Rejection Ratio (TA = 25°C) (3.0≤ VCC ≤ 40 V) PSRR 70 96 – dB OUTPUT OPERATION AMPLIFIER Input Offset Voltage (VCM = 2.5 V) VIO – 4.0 15 mV Input Bias Current (VCM = 2.5 V) IIB – 30 200 nA Input Offset Current (VCM = 2.5 V) IIO – 5.0 75 nA Voltage Gain + (TA = 25°C) (RL = 2.0 kΩ to Gnd, 1.0 V≤ VO ≤ 2.5 V) AVOL + 25 250 – V/mV Voltage Gain – (TA = 25°C) (RL = 2.0 kΩ to VCC (Op Amp), 1.0 V≤ VO ≤ 2.5 V) AVOL – 25 250 – V/mV Common Mode Voltage Range (TA = 25°C) VICR 0 – VCC – 2.0 V Common Mode Rejection Ratio (TA = 25°C) (VCM = 0 V to 3.0 V) CMRR 76 100 – dB Power–Supply Rejection Ratio (TA = 25°C) (3.0 V≤ VCC (Op Amp)≤ 40 V) PSRR 76 100 – dB Output Source Current (TA = 25°C) ISource 75 150 – mA Output Sink Current (TA = 25°C) ISink 10 35 – mA Slew Rate (TA = 25°C) SR – 0.6 – V/µs Output Low Voltage (TA = 25°C, IL = –5.0 mA) VOL – – 1.0 V Output High Voltage (TA = 25°C, IL = 50 mA) VOH VCC (Op Amp) – 3.0 – – V

4 MOTOROLA ANALOG IC DEVICE DATA

Figure 1. Output Switch On/Off Time Figure 2. Standby Supply Current Figure 3. Emitter–Follower Configuration Figure 4. Common–Emitter Configuration

6 MOTOROLA ANALOG IC DEVICE DATA

Figure 7. Inverting Converter

2 Iout(max) 2 Iout(max)

8 Vripple(pp) Vripple Vripple

Vsat = Saturation voltage of the output switch. VF = Forward voltage drop of the ringback rectifier. – Nominal input voltage. If this voltage is not constant, then use Vin(max) for step–down and Vin(min) for step–up and inverting convertor. – Minimum desired output switching frequency at the selected values for Vin and IO . – resistance and board layout. The ripple voltage should be kept to a low value since it will directly effect the line and load regulation.

µA78S40 7MOTOROLA ANALOG IC DEVICE DATA OUTLINE DIMENSIONS P SUFFIX PLASTIC PACKAGE CASE 648–08 ISSUE R NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3. DIMENSION L TO CENTER OF LEADS WHEN FORMED PARALLEL. 4. DIMENSION B DOES NOT INCLUDE MOLD FLASH. 5. ROUNDED CORNERS OPTIONAL. –A– B F C S H G D J L M 16 PL SEATING 916 K PLANE–T– MAM0.25 (0.010) T DIM MIN MAX MIN MAX MILLIMETERSINCHES A 0.740 0.770 18.80 19.55 B 0.250 0.270 6.35 6.85 C 0.145 0.175 3.69 4.44 D 0.015 0.021 0.39 0.53 F 0.040 0.70 1.02 1.77 G 0.100 BSC 2.54 BSC H 0.050 BSC 1.27 BSC J 0.008 0.015 0.21 0.38 K 0.110 0.130 2.80 3.30 L 0.295 0.305 7.50 7.74 M 0 10 0 10 S 0.020 0.040 0.51 1.01 /C0095/C0095/C0095/C0095

µA78S40

8 MOTOROLA ANALOG IC DEVICE DATA

Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters which may be provided in Motorola data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. Motorola does not convey any license under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part. Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer. How to reach us: USA / EUROPE / Locations Not Listed: Motorola Literature Distribution;JAPAN : Nippon Motorola Ltd.; Tatsumi–SPD–JLDC, 6F Seibu–Butsuryu–Center, P.O. Box 20912; Phoenix, Arizona 85036. 1–800–441–2447 or 602–303–54543–14–2 Tatsumi Koto–Ku, Tokyo 135, Japan. 03–81–3521–8315 INTERNET : http://Design–NET.com 51 Ting Kok R oad, Tai Po, N.T., Hong Kong. 852–26629298 µA78S40/D /C0042/C0117/C0065/C0055/C0056/C0083/C0052/C0048/C0047/C0068/C0042