L4947PD STMicroelectronics, L4947PD Datasheet - Page 3

• Manufacturer Part Number: L4947PD
• Description: IC REG LDO W/RESET 20 PSOIC
• Manufacturer: STMicroelectronics

Specifications of L4947PD

• Regulator Topology: Positive Fixed
• Voltage - Output: 5V
• Voltage - Input: 6 ~ 26 V
• Voltage - Dropout (typical): 0.4V @ 500mA
• Number Of Regulators: 1
• Current - Output: 500mA
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: PowerSO-20 Exposed Bottom Pad
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Current - Limit (min): -
• Other names: 497-1405-5

ELECTRICAL CHARACTERISTICS (refer to the test circuit, V
R
(*) For a DC voltage 26 < V
FUNCTIONAL DESCRIPTION
The L4947PD is a very low drop 5V/0.5A voltage
regulator provided with a reset function and there-
fore particularly suited to meet the requirements
of supplying the microprocessor systems used in
automotive and industrial applications.
The block diagram shows the basic structure of
the device : the reference, the error amplifier, the
driver, the power PNP, the protection and reset
p
Symbol
V
V
V
= 1K , R
V
V
SVR
RT peak
V
RT (off)
RT (on)
i
V
V
V
I
V
disch
T
T
V
–V
I
Hyst
I
V
I
V
V
sc
R
dH
q
d
R
d
o
d
i
o
o
o
o
L
Output Voltage
Operating Input Voltage
Line Regulation
Load Regulation
Dropout Voltage
Quiescent Current
Temperature Output Voltage
Drift
Supply Volt. Rej.
Output Short Circuit Current
Reset Output Saturation Voltage
Reset Output Leakage Current
Power On-Off Reset out Peak
Voltage
Power OFF V
Power ON V
Power ON-Off Hysteresis
Delay Comparator Threshold
Delay Comparator Hysteresis
Delay Capacitor Charging
Current
Delay Capacitor Discharge
Voltage
Power on Reset Delay Time
= 1K , –40 C
i
< 37V the device is not operating
Parameter
o
o
Threshold
Threshold
T
J
125 C, unless otherwise specified)
I
Over Full T Range
T
I
V
I
I
I
Over Full T Range
I
I
I
I
C
V
1.5V < V
I
3.0V < V
I
V
1K Reset Pull-up to V
V
Transition
V
Transition
V
V
Transition
V
Transition
V
V
C
o
o
o
o
o
o
o
o
o
R
R
J
i
i
O
o
o
RT (on)
d
d
d
o
o
d
= 0mA to 500mA
= 0mA to (*) 500mA
= 5mA
= 5mA to 500mA
= 500mA, T
= 0mA, T
= 0mA Over Full T
= 500mA Over Full T
= 350mA ; f = 120Hz
= 1.6mA
= 8mA
= 6V to 26V ;
= 12V
= 25 C
@ Reset Out H to L
@ Reset Out L to H
@ Reset Out L to H
@ Reset Out H to L
= 3V, T
< V
= 100 F ;
in Regulation, V
= 100nF, T
RT (off)
Test Conditions
–V
o
o
< V
< V
RT (off)
5V
J
J
= 25 C
functions.
The power stage is a Lateral PNP transistor
which allows a very low dropout voltage (typ.
400mV at T
temperature range @ I
curve of the dropout voltage as a function of the
junction temperature is shown in Fig. 1 : that is
the worst case, where I
The current consumption of the device (quiescent
= 25 C
pp
RT (off)
RT (off)
J
J
= 25 C
= 25 C
R
,
,
= 5V
i
= 14. 4V, C
o
J
= 25 C, max. 750mV over the full
Min.
4.80
4.90
0.50
4.75
3.65
3.20
50
10
o
6
= 47 F, ESR < 10 ,
O
O
= 500mA.
= 500mA). The typical
V
+ 0.05
– 0.5
Vo –
Typ.
5.00
5.00
0.40
0.80
0.65
0.15
0.05
4.00
3.55
0.45
0.55
RT (off)
110
6.5
15
60
20
20
5
5
Max.
5.20
5.10
0.55
0.75
1.50
0.40
0.40
V
0.04
4.35
3.90
1.20
180
1.0
26
50
60
10
13
50
30
o
–
L4947PD
mV/ C
Unit
mV
mV
mA
mA
mA
/ A
ms
dB
V
V
V
V
V
A
V
V
V
V
V
V
V
V
V
V
A
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