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L4979D 数据表(PDF) 9 Page - STMicroelectronics

部件名 L4979D
功能描述  Low drop voltage regulator
PDF  22 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

L4979D 数据表(HTML) 9 Page - STMicroelectronics

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L4979D, L4979MD
Electrical specifications
Doc ID 10262 Rev 9
9/22
Res
R_p_u
Internal pull-up
resistance
With respect to Vo
12
25
50
k
Res
Vo_th
Reset threshold voltage
Vs = 5.6 to 31 V
Io = 1 to 150 mA
6%
below
Vo_ref
8%
below
Vo_ref
10%
below
Vo_ref
Vcr
Vrhth
Reset timing high
threshold
Vs = 13.5 V
44%
Vo_ref
47%
Vo_ref
50%
Vo_ref
Vcr
Vrlth
Reset timing low
threshold
Vs = 13.5 V
10%
Vo_ref
13%
Vo_ref
16%
Vo_ref
Vcr
Icr
Charge current
Vs = 13.5 V
8
17
30
µA
Vcr
Idr
Discharge current
Vs = 13.5 V
8
17
30
µA
Res
trr_2
Reset delay time(1)
Vo =Vo_th - 100 mV
100
250
700
µs
Res
trd
Reset pulse delay
Vs = 13.5 V; Ctr = 1 nF
65
150
ms
1.
When Vo becomes lower than 4 V, the reset reaction time decreases down to 2 µs assuring a faster reset
condition in this particular case.
Table 8.
Watchdog
Pin
Symbol
Parameter
Test condition
Min.
Typ.
Max.
Unit
Wi
Vih
Input high voltage
Vs = 13.5 V
3.5
V
Wi
Vil
Input low voltage
Vs = 13.5 V
1.5
V
Wi
Vih
Input hysteresis
Vs = 13.5 V
300
mV
Wi
Ii
Pull down current
Vs = 13.5 V
10
20
µA
Vcw
Vwhth
High threshold
Vs = 13.5 V
2.20
2.35
2.50
V
Vcw
Vwlth
Low threshold
Vs = 13.5 V
0.50
0.65
0.80
V
Vcw
Icwc
Charge current
Vs = 13.5 V; Vcw = 0.1 V
4
7.5
14
µA
Vcw
Icwd
Discharge current
Vs = 13.5 V; Vcw = 2.5 V
1.0
2.4
4.5
µA
Vcw
Twop
Watchdog period
Vs = 13.5 V;
Ctw =47nF
25
50
90
ms
Res
twol
Watchdog output low
time
Vs = 13.5 V;
Ctw =47nF
6
10
22
ms
Table 9.
Enable
Pin
Symbol
Parameter
Test condition
Min.
Typ.
Max.
Unit
En
Ven_l
Enable input low voltage
1
V
En
Ven_h
Enable input high
voltage
3
V
En
Ven_hy
Enable input hysteresis
700
1000
1100
mV
En
I_leak
Pull down current
En = 5 V
2
10
20
µA
Table 7.
Reset (continued)
Pin
Symbol
Parameter
Test condition
Min.
Typ.
Max.
Unit



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