MOTOROLA UA78S40PV, UA78S40PC, UA78S40MC Datasheet

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MOTOROLA UA78S40PV, UA78S40PC, UA78S40MC Datasheet

Universal Switching

Regulator Subsystem

The μA78S40 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

Order this document μA78S40/D

μA78S40

UNIVERSAL

SWITCHING REGULATOR

SUBSYSTEM

SEMICONDUCTOR

TECHNICAL DATA

P SUFFIX

PLASTIC PACKAGE

CASE 648

Simplified Block Diagram

Noninv.

Inv.

 

Timing

 

Ipk

 

Driver

Switch

Input

Input

Gnd

Capacitor

VCC

Sense

Collector

Collector

9

10

11

12

13

14

 

15

16

 

 

CT

Ipk

 

 

 

 

 

 

 

Oscilator

 

S

Q

 

 

 

 

±

 

 

 

 

 

 

 

 

+Comp.

 

R

 

170

 

 

 

 

 

 

 

1.25V

 

 

± Op

 

 

 

 

 

Reference

 

 

 

 

 

 

 

Amp

 

 

 

 

D1

 

 

 

 

 

 

 

 

 

 

+

 

 

 

 

 

8

7

6

5

4

3

 

2

1

Ref

Inv

Noninv

VCC

Output

Switch

Diode

Diode

Output

Input

Input

Op Amp

 

Emitter

Anode

Cathode

(Bottom View)

PIN CONNECTIONS

 

 

 

 

 

 

 

 

Switch Collector

Diode Cathode

1

 

 

 

16

 

 

 

 

 

 

 

Driver Collector

 

 

 

 

 

 

 

 

Diode Anode

2

 

 

 

15

Switch Emitter

 

 

 

 

 

Ipk Sense

 

 

 

 

 

3

 

 

 

14

Op Amp Output

 

 

 

 

 

VCC

4

 

 

 

13

 

VCC Op Amp

 

 

 

 

 

Timing Capacitor

 

5

 

 

 

12

 

 

 

 

 

 

 

 

 

Op

 

Noninv.

6

 

 

 

11

Ground

 

 

 

 

 

 

 

Comparator

Amp

 

 

 

 

 

 

Inv. Input

7

 

 

 

10

 

 

 

 

 

Inv. Input

 

 

 

 

 

 

 

 

Comparator

 

 

Reference

8

 

 

 

9

 

 

 

 

 

 

 

 

Noninv. Input

 

 

 

 

 

 

 

 

 

 

 

 

 

(Top View)

 

ORDERING INFORMATION

 

Temperature

 

Device

Range

Package

 

 

 

μA78S40PC

TA = 0° to +70°C

Plastic

μA78S40PV

TA = ± 40° to +85°C

Plastic

Motorola, Inc. 1996

Rev 1

 

 

 

μA78S40

 

MAXIMUM RATINGS

 

 

 

 

 

 

 

 

 

 

 

Rating

Symbol

 

Value

Unit

 

 

 

 

 

Power Supply Voltage

VCC

 

40

V

Op Amp Power Supply Voltage

VCC (Op Amp)

40

V

Common Mode Input Range

VICR

 

±0.3 to VCC

V

(Comparator and Op Amp)

 

 

 

 

 

 

 

 

 

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)

PD

 

1500

mW

Derate above + 25°C (Note 1)

1/RθJA

 

14

mW/°C

Storage Temperature Range

Tstg

 

±65 to + 150

°C

Operating Temperature Range

TA

 

 

°C

μA78S40V

 

 

 

±40 to +85

 

μA78S40C

 

 

 

0 to +70

 

 

 

 

 

 

 

NOTES: 1. Tlow =

±40° for μA78S40PV

Thigh =

+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)

ICC

 

 

 

mA

(VCC = 5.0 V)

 

±

1.8

3.5

 

(VCC = 40 V)

 

±

2.3

5.0

 

Supply Current (Op Amp VCC, connected)

ICC

 

 

 

mA

(VCC = 5.0 V)

 

±

±

4.0

 

(VCC = 40 V)

 

±

±

5.5

 

REFERENCE

 

 

 

 

 

 

 

 

 

 

 

Reference Voltage

Vref

1.180

1.245

1.310

V

(Iref = 1.0 mA)

 

 

 

 

 

Reference Voltage Line Regulation

Regline

±

0.04

0.2

mV/V

(3.0 V VCC 40 V, Iref = 1.0 mA, TA = 25°C)

 

 

 

 

 

Reference Voltage Load Regulation

Regload

±

0.2

0.5

mV/mA

(1.0 mA Iref 10 mA, TA = 25°C)

 

 

 

 

 

2

MOTOROLA ANALOG IC DEVICE DATA

μA78S40

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)

Ichg

 

 

 

μA

(VCC = 5.0 V)

 

20

±

50

 

(VCC = 40 V)

 

20

±

70

 

Discharging Current (TA = 25°C)

Idis

 

 

 

μA

(VCC = 5.0 V)

 

150

±

250

 

(VCC = 40 V)

 

150

±

350

 

Oscillator Voltage Swing (TA = 25°C)

Vosc

±

0.5

±

V

(VCC = 5.0 V)

 

 

 

 

 

Ratio of Charge/Discharge Time

tchg/tdis

±

6.0

±

±

CURRENT LIMIT

 

 

 

 

 

 

 

 

 

 

 

Current±Limit Sense Voltage (TA = 25°C)

VCLS

250

±

350

mV

(VCC ± Vlpk Sense)

 

 

 

 

 

OUTPUT SWITCH

 

 

 

 

 

 

 

 

 

 

 

Output Saturation Voltage 1

Vsat1

±

0.93

1.3

V

(ISW = 1.0 A, Pin 15 tied to Pin 16)

 

 

 

 

 

Output Saturation Voltage 2

Vsat2

±

0.5

0.7

V

(ISW = 1.0 A, I15 = 50 mA)

 

 

 

 

 

Output Transistor Current Gain (TA = 25°C)

hFE

±

70

±

±

(IC = 1.0 A, VCE = 5.0 V)

 

 

 

 

 

Output Leakage Current (TA = 25°C)

IC(off)

±

10

±

nA

(VCE = 40 V)

 

 

 

 

 

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)

PSRR

70

96

±

dB

(3.0 VCC 40 V)

 

 

 

 

 

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)

AVOL+

25

250

±

V/mV

(RL = 2.0 kΩ to Gnd, 1.0 V VO 2.5 V)

 

 

 

 

 

Voltage Gain ± (TA = 25°C)

AVOL±

25

250

±

V/mV

(RL = 2.0 kΩ to VCC (Op Amp), 1.0 V VO 2.5 V)

 

 

 

 

 

Common Mode Voltage Range (TA = 25°C)

VICR

0

±

VCC ± 2.0

V

Common Mode Rejection Ratio (TA = 25°C)

CMRR

76

100

±

dB

(VCM = 0 V to 3.0 V)

 

 

 

 

 

Power±Supply Rejection Ratio (TA = 25°C)

PSRR

76

100

±

dB

(3.0 V VCC (Op Amp) 40 V)

 

 

 

 

 

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)

±

±

V

 

 

± 3.0

 

 

 

 

 

 

 

 

 

MOTOROLA ANALOG IC DEVICE DATA

3

 

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