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查询L4901供应商
DUAL5V REGULATOR WITH RESET
.
OUTPUTCURRENTS : I01=400mA
I
=400mA
02
.
FIXEDPRECISIONOUTPUTVOLTAGE
5V±2%
.
RESETFUNCTION CONTROLLED BY INPUT
VOLTAGEAND OUTPUT1 VOLTAGE
.
RESET FUNCTION EXTERNALLY PROGRAMMABLETIMING
.
RESET OUTPUT LEVEL RELATED TO OUTPUT 2
.
OUTPUT 2 INTERNALLY SWITCHED WITH
ACTIVEDISCHARGING
.
LOW LEAKAGE CURRENT, LESS THAN 1µA
ATOUTPUT 1
.
LOWQUIESCENTCURRENT (Input 1)
.
INPUT OVERVOLTAGE PROTECTION UP TO
60V
.
RESETOUTPUT HIGH
.
OUTPUTTRANSISTORSSO A PROTECTION
.
SHORT CIRCUIT AND THERMAL OVERLOADPROTECTION
L4901A
HEPTAWATT (Vertical)
(PlasticPackage)
ORDERING NUMBER : L4901A
DESCRIPTION
The L4901A is a monolithic low drop dual 5V
regulatordesignedmainlyfor supplyingmicroprocessorsystems.
Resetand data savefunctionsduring switchon/off
canbe realized.
PIN CONNECTION
June 2000
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L4901A
PIN DESCRIPTION
N°
1 Input 1 Low QuiescentCurrent 400mA Regulator Input.
2 Input 2 400mA regulator input.
3 Timing
4 GND Common Ground.
5 Reset
6 Output 2 5V – 400mA Regulator Output. Enabled if V
7 Output 1 5V – 400mA regulatoroutput with Low leakage (in switch-OFF condition).
BLOCKDIAGRAM
Name Function
If Reg. 2 is switched-ON the delay capacitor is charged with a 10µA constant current. When Reg.
Capacitor
2 is switched-OFF the delay capacitor is decharged.
When pin 3 reaches 5V the reset outputis switched high.
Output
Therefore t
the C
RD=Ct
capacitor is discharged.
02
5V
(
); tRD(ms) = Ct(nF)
10µA
1>VRTand V
o
IN 2>VIT
. If Reg. 2 is switched-OFF
SCHEMATIC DIAGRAM
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L4901A
ABSOLUTE MAXIMUMRATINGS
Symbol Parameter Value Unit
V
IN
I
o
T
DC Input Voltage
Transient Input Overvoltage (t = 40ms)
Output Current Internally Limited
Storage and Junction Temperature – 40 to 150
j
THERMAL DATA
Symbol Parameter Value Unit
R
th (j-c)
Thermal Resistance Junction-case Max. 4
24
60
V
V
°C
°C/W
ELECTRICAL CHARACTERISTICS (VIN= 14, 4V, T
=25°C unless otherwise specified)
amb
Symbol Parameter Test Conditions Min. Typ. Max. Unit
DC Operating Input Voltage 20 V
V
i
V
V
V
I
I
L01
I
V
V
V
∆V
∆V
∆V
∆V
I
V
V
V
V
t
∆V
∆
∆V
∆T
SVR1 Supply Voltage Rejection f = 100Hz, V
SVR2 Supply Voltage Rejection 50 80 dB
* The dropoutvoltage is defined as thedifference between theinput and the outputvoltage when theoutput voltage is lowered of 25 mV under
constant output current condition.
Output Voltage 1
01
Output Voltage 2 HIGH
02 H
Output Voltage 2 LOW I02= – 5mA 0.1 V
02 L
Output Current 1
01
Leakage Output 1 Current
Output Current 2 ∆
02
Output 1 Dropout Voltage (*) I01= 10mA
I01
Input Threshold Voltage V01+ 1.2 6.4 V01+ 1.7 V
IT
Input Threshold Voltage Hyst. 250 mV
ITH
Line Regulation 1 7V < VIN< 18V, I01= 5mA 5 50 mV
01
Line Regulation 2 7V < VIN< 18V, I02= 5mA 5 50 mV
02
Load Regulation 1 5mA < I01< 400mA 50 100 mV
01
Load Regulation 2 5mA < I01< 400mA 50 100 mV
02
Quiescent Current
I
Q
Quiescent Current 1
Q1
Reset Threshold Voltage V02– 0.15 4.9 V02–0.05 V
RT
Reset Threshold Hysteresis 30 50 80 mV
RTH
Reset Output Voltage HIGH
RH
Reset Output Voltage LOW IR= –<0>5mA 0.25 0.4 V
RL
Reset Pulse Delay Ct= 10nF 3 5 11 ms
RD
Timing Capacitor Discharge Time Ct= 10nF 20
t
d
01
Thermal Drift
T
02
Thermal Drift
R Load 1kΩ
R Load 1k
= – 100mV
V
∆
01
=0,V01≤ 3V
V
IN
= – 100mV
V
02
= 100mA
I
01
= 300mA
I
01
02=I01
0<V
7V < V
5mA, I
≤
01
= 500µA
R
≤ 5mA
IN
IN
I
I
6.3V < V
I
–20°C≤T
–20°C≤T
Io = 100mA
Ω
< 13V
< 13V
IN
02
< 13V
amb
amb
R
=0,V
≤ 125°C
≤ 125°C
= 0.5V
IN2
=0
4.95 5.05 5.15 V
V01–0.1 5 V
01
400 mA
1
400 mA
0.7
0.8
1.1
4.5
1.6
0.8
1
1.4
6.5
3.5
0.6 0.9 mA
V
– 1 4.12 V
02
02
0.3 –
0.8
0.3 –
0.8
50 84 dB
V
µA
V
V
V
mA
V
µs
mV/°C
mV/°C
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