Ordering number : EN7161
L78MS05J
L78MS05JSMP
Monolithic Linear IC
http://onsemi.com
5V Constant-Voltage
Power Supply with Strobe Line
Overview
The L78MS05J and L78MS05JSMP are general-purpose constant voltage power supplies that feature an output current
of 500mA and a built-in on/off function. The current drain in the output off state is low, making these devices effective
for reducing power consumption in application equipment. The surface mounting package can contribute to
miniaturization and improved efficiency. These devices are optimal for use in all types of AV and OA equipment and in
automotive applications (such as power supplies for meters) as well.
Functions
•
Strobe pin that controls the on/off state of the output voltage (active low input).
•
500mA output current.
Features
•
TO-220-5H package for easier mounting and thermal design (L78MS05J).
•
SMP5 package for easier mounting and thermal design (L78MS05JSMP).
•
Low output off state current drain makes these devices optimal for saving power in applications.
•
Full complement of built-in protection circuits (current limiter and thermal protection circuit).
Specifications
Maximum Ratings
at Ta = 25°C
Parameter
Maximum input voltage
Maximum strobe pin voltage
Allowable power dissipation
Symbol
VIN max
VST max
Pd max
L78MS05J - independent IC
L78MS05J SMP *: When mounted on
the stipulated circuit
board 1
*: When mounted on
the stipulated circuit
board 2
Operating temperature
Operating temperature
*: Stipulated circuit board 1:
76.1×114.3×1.6mm
3
Cooper foil ratio: 60% FR4
Heat sink fin mounting area pattern: 23% [2000mm
2
]
*: Stipulated circuit board 2:
140×300×1.6mm
3
Cooper foil ratio: 60% FR4
Topr
Tstg
Conditions
Ratings
35
VIN max
1.75
3.9
Unit
V
V
W
W
2.0
W
-40 to +85
-58 to +150
°C
°C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating
Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.
Semiconductor Components Industries, LLC, 2013
August, 2013
92706 / 10606 MS OT B8-5886 No.7161-1/7
L78MS05J/L78S05JSMP
Allowable Operating Conditions
at Ta = 25°C
Parameter
Input voltage
Output current
Output on control voltage
Output off control voltage
Symbol
VIN
LOUT
VSTL
VSTH
Conditions
Ratings
7.5 to 20.0
0 to 500
-0.3 to 0.8
2.0 to VIN
Unit
V
mA
V
mA
Electrical Characteristics
at Ta = 25°C, VIN = 10V, IOUT = 350mA
Parameter
Symbol
Conditions
min
[Output On State, VST = low]
Output voltage 1
Line regulation 1
Line regulation 2
Load regulation 1
Load regulation 2
Output voltage 2
Current drain
Output noise voltage
Ripple rejection
VOUT1
ΔVOLN1
ΔVOLN2
ΔVOLD1
ΔVOLD2
VOUT2
IQ
VNO
Rrej1
Rrej2
Minimum input to
output voltage drop
Output on control
voltage
Short circuit current
Peak output current
IOSC
IOP
VIN = 35V, for GND
300
700
mA
mA
VSTL
0.8
V
Vdrop
10Hz
≤
f
≤
100kHz
f = 120Hz, 8V
≤
VIN
≤
19V, IOUT = 100mA
f = 120H, 8V
≤
VIN
≤
19V, IOUT = 300mA
IOUT = 350mA
60
60
7V
≤
VIN
≤
25V, IOUT = 200mA
8V
≤
VIN
≤
20V, IOUT = 200mA
5mA
≤
IOUT
≤
500mA
5mA
≤
IOUT
≤
200mA
7V
≤
VIN
≤
20V, 5mA
≤
IOUT
≤
350mA
4.75
1.9
90
63
54
2.0
4.8
5.0
3
1
5.2
50
25
100
50
5.25
5.0
V
mV
mV
mV
mV
V
mA
μVrms
dB
dB
V
Ratings
typ
max
Unit
[Output Off State, VST = high]
Low-level output
voltage
Quiescent current
Output off control
voltage
[Thermal Protection]
Operating
temperature
TTSD
Design target value*
150
180
°C
IQOFF
VSTH
VST = 5V, except for ISTB
2.0
35
40
VIN
μA
V
VOOFF
VST = 5V
20
200
mV
* This rating is a design target value and is not measured.
No.7161-2/7
L78MS05J/L78S05JSMP
Block Diagram
Stipulated Test Circuits
Application Notes
Notes: 1. CIN and COUT must be located as close as possible to the IC to stabilize IC operation.
2. COUT must be 0.1µF or larger, and a capacitor (such as a tantalum capacitor) with a low temperature
coefficient must be used to prevent oscillation at low temperatures.
3. If the STB pin is open, the internal bias will result in the output going to the on state. If the STB function is not
used, the STB pin must be connected to ground to complete the STB operation.
4. Note that a large current will flow if the IC is connected in reverse, that is, if VIN is connected to - and GND is
connected to +.
No.7161-4/7
stm32/stm8
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