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MC34160 Datasheet(PDF) 5 Page - ON Semiconductor

Part No. MC34160
Description  MICROPROCESSOR VOLTAGE REGULATOR/ SUPERVISORY CIRCUIT
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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MC34160 Datasheet(HTML) 5 Page - ON Semiconductor

   
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MC34160 MC33160
5
MOTOROLA ANALOG IC DEVICE DATA
Figure 9. DW Suffix (SOP–16L) Thermal Resistance and
Maximum Power Dissipation versus P.C.B. Copper Length
30
40
50
60
70
80
90
0
0.4
0.8
1.2
1.6
2.0
2.4
020
30
50
40
10
L, LENGTH OF COPPER (mm)
100
2.8
PD(max) for TA = 50°C
R
θJA
2.0 oz.
Copper
Graph represents symmetrical layout
3.0 mm
L
L
PIN FUNCTION DESCRIPTION
Pin
Function
Description
1
Comparator Inverting Input
This is the Uncommitted Comparator Inverting input. It is typically connected to a resistor
divider to monitor a voltage.
2
Comparator Noninverting Input
This is the Uncommitted Comparator Noninverting input. It is typically connected to a
reference voltage.
3
N.C.
No connection. This pin is not internally connected.
4, 5, 12, 13
Gnd
These pins are the control circuit grounds and are connected to the source and load
ground returns. They are part of the IC lead frame and can be used for heatsinking.
6
Comparator Output
This is the Uncommitted Comparator output. It is an open collector sink–only output
requiring a pull–up resistor.
7
Reset
This is the Reset Comparator output. It is an open collector sink–only output requiring a
pull–up resistor.
8
Power Warning
This is the Power Warning Comparator output. It is an open collector sink–only output
requiring a pull–up resistor.
9
Power Sense
This is the Power Warning Comparator noninverting input. It is typically connected to a
resistor divider to monitor the input power source voltage.
10
Hysteresis Adjust
The Power Warning Comparator hysteresis is programmed by a resistor connected from
this pin to ground.
11
Regulator Output
This is the 5.0 V Regulator output.
14
VCC
This pin is the positive supply input of the control IC.
15
Chip Disable
This input is used to switch the IC into a standby mode turning off all outputs.
16
Vref
This is the 2.6 V Reference output. It is intended to be used in conjunction with the Power
Warning and Uncommitted comparators.
OPERATING DESCRIPTION
The MC34160 series is a monolithic voltage regulator and
supervisory circuit containing many of the necessary
monitoring functions required in microprocessor based
systems. It is specifically designed for appliance and
industrial applications, offering the designer a cost effective
solution with minimal external components. These devices
are specified for operation over an input voltage of 7.0 V to
40 V, and with a junction temperature of –40
° to +150°C. A
typical microprocessor application is shown in Figure 10.
Regulator
The 5.0 V regulator is designed to source in excess of
100 mA output current and is short circuit protected. The
output has a guaranteed tolerance of
±5.0% over line, load,
and temperature. Internal thermal shutdown circuitry is
included to limit the maximum junction temperature to a safe
level. When activated, typically at 170
°C, the regulator output
turns off.
In specific situations a combination of input and output
bypass capacitors may be required for regulator stability. If
the regulator is located an appreciable distance (
≥ 4″) from
the supply filter, an input bypass capacitor (Cin) of 0.33 µF or
greater is suggested. Output capacitance values of less than
5.0 nF may cause regulator instability at light load (
≤ 1.0 mA)
and cold temperature. An output bypass capacitor of 0.1
µF
or greater is recommended to ensure stability under all load
conditions. The capacitors selected must provide good high
frequency characteristics.
Good construction techniques should be used to minimize
ground loops and lead resistance drops since the regulator
does not have external sense inputs.


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