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參數(shù)資料
| 型號(hào)： | L4955 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 5A ULDO Linear Regulators Family(5A極低壓差線性穩(wěn)壓器) |
| 中文描述： | 5A條ULDO線性穩(wěn)壓器系列（5A條極低壓差線性穩(wěn)壓器） |
| 文件頁數(shù)： | 3/15頁 |
| 文件大?。?/td> | 162K |
| 代理商： | L4955 |
L4955 - ELECTRICAL CHARACTERISTICS
(T
j
= 25
°
C, V
in
= 12V, unlessotherwise specified).
= Specificationsreferred to T
J
from 0
°
Cto +125
°
C.
Symbol
V
IN
V
O
Parameter
Test Condition
Min.
4.5
1.235
1.222
Typ.
Max.
22
1.285
1.298
10
10
1.1
1.5
0.75
7.5
Unit
V
V
V
mV
mV
V
V
V
A
A
A
A
mA
mA
μ
A
V
V
μ
A
V
V
V
Operating Supply Voltage
Output Voltage (1)
0.1A < I
O
< 5A; 4.5V< V
IN
<12V
4.5V < V
IN
< 12V; 0.1A< I
O
< 5A
4.5V < V
IN
<22V; I
O
= 10mA
0.1A < IO < 5A
I
O
= 5A
V
IN
≥
4.5V
1.26
1.26
2
2
0.75
1.1
0.55
6.3
1.8
3
0.85
2
2.7
120
1.26
0.2
20
0.9x V
O
0.2
0.1
V
O
V
O
V
O
Line regulation
Load regulation (1)
Dropout Voltage
(1)
I
O
= 2A
I
O
Current Limiting
Short Circuit Current
Programmable Current
Limiting
Quiescent Current
5.1
V
O
= 0V
R
lim
= 13k
R
lim
= 47k
0.1A < I
O
< 5A
2.55
0.70
3.45
1.00
3
4
200
1.42
I
Q
C
L
= 0
C
L
= 13k
Stand By Current
Inhibit Threshold
Inhibit Hysteresis
Inhibit Bias Sink Current
Power Good Threshold
Power Good Hysteresis
Power Good Saturation
INH = 5V
Rising Edge
1.1
INH = 5V or 0.8V
Rising Edge
60
I
PG
= 4mA
0.4
Ripple Rejection
f = 120Hz, I
O
= 5A
V
IN
= 6V
V
IN
= 2V
PP
60
75
dB
(1) Output voltage connected to ADJ.
THERMAL DATA
(HEPTAWATT & VERSAWATTpackages)
Symbol
R
th j-case
R
th j-amb
Parameter
Value
2.5
50
150
20
Unit
°
C/W
°
C/W
°
C
°
C
Thermal Resistance Junction-case
Thermal Resistance Junction-ambient
Thermal Shutdown
Thermal Hysteresis
Max.
Max.
Typ.
Typ.
PIN FUNCTIONS
HW
1
2
VW
1
–
Name
IN
CL
Function
Unregulated input voltage; this pin must be bypassed with a capacitor larger than 10
μ
F.
A resistor connected between this pin and ground sets the programmable current limiting
value. When the programmable current limiting is not used the pin must be connected to GND.
TTL-CMOS input. A logic high level on this input disables the device. An internal pull-down
insures full functionally even if the pin is open.
Ground.
The output is connected directly to this terminal for 1.26V operation; it is connected to the
output through a resistive divider for higher voltages.
Opendrain output, this signal islow when theoutput voltage is lower than90%, otherwise ishigh.
Regulated output voltage. A minimum bypass capacitor of 22
μ
F is required to insure stability.
3
–
INH
4
5
2
–
GND
ADJ
6
7
–
3
PG
OUT
L4955
3/15
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