L4904A
L4904A
DUAL 5V REGULATOR WITH RESET
.OUTPUT CURRENTS : I01 = 50mA
. I02 = 100mA
FIXED PRECISION OUTPUT VOLTAGE
.5V ± 2 %
RESET FUNCTION CONTROLLED BY INPUT
.VOLTAGE AND OUTPUT 1 VOLTAGE
RESET FUNCTION EXTERNALLY PRO-
.GRAMMABLE TIMING
RESET OUTPUT LEVEL RELATED TO
.OUTPUT 2
OUTPUT 2 INTERNALLY SWITCHED WITH
.ACTIVE DISCHARGING
LOW LEAKAGE CURRENT, LESS THAN 1μA
.AT OUTPUT 1
.LOW QUIESCENT CURRENT (Input 1) INPUT OVERVOLTAGE PROTECTION UP TO
.60V
.RESET OUTPUT NORMALLY HIGH
.OUTPUT TRANSISTORS SOA PROTECTION SHORT CIRCUIT AND THERMAL OVERLOAD PROTECTION
DESCRIPTION
The L4904A is a monolithic low drop dual 5V regulator designed mainly for supplying microprocessor systems.
Reset and data save functions during switch on/off can be realized.
Minidip
ORDERING NUMBER : L4904A
PIN CONNECTION
June 2000 |
1/9 |
L4904A
PIN FUNCTIONS
N° |
Name |
Function |
1Input 1 Low Quiescent Current 50mA Regulator Input.
2Input 2 100mA Regulator Input.
3 |
Timing |
If Reg. 2 is switching-ON the delay capacitor is charged with a |
|
Capacitor |
Reg. 2 is switched-OFF the delay capacitor is discharged. |
4 |
GND |
Common Ground. |
5 |
N.C. |
Not connected. |
6 |
Reset |
When pin 3 reaches 5V the reset output is switched high. |
|
Output |
5V |
|
|
Therefore tRD = Ct (10μA); tRD (ms) = Ct (nF). |
7 |
Output 2 |
5V ± 100mA Regulator Output. Enabled if Vo 1 > VRT and VIN 2 |
|
|
the Co2 capacitor is discharged. |
10μA constant current. When
> VIT. If Reg. 2 is switched-OFF
8 |
Output 1 5V ± 50mA regulator output with low leakage in switch-OFF condition. |
BLOCK DIAGRAM
SCHEMATIC DIAGRAM
2/9
|
|
|
|
L4904A |
ABSOLUTE MAXIMUM RATINGS |
|
|
|
|
Symbol |
Parameter |
|
Value |
Unit |
VIN |
DC Input Voltage |
|
24 |
V |
|
Transient Input Overvoltage (t = 40ms) |
|
60 |
V |
Io |
Output Current |
|
Internally Limited |
|
Ptot |
Power Dissipation at Tamb = 50°C |
|
1 |
W |
Tj |
Storage and Junction Temperature |
|
± 40 to 150 |
°C |
THERMAL DATA |
|
|
|
|
Symbol |
Parameter |
|
Value |
Unit |
Rth j-amb |
Thermal Resistance Junction-ambient |
Max |
100 |
°C/W |
ELECTRICAL CHARACTERISTICS (VIN = 14.4V, Tamb = 25oC unless otherwise specified)
Symbol |
Parameter |
Test Conditions |
Vi |
DC Operating Input Voltage |
|
V01 |
Output Voltage 1 |
R Load 1kΩ |
V02 H |
Output Voltage 2 HIGH |
R Load 1kΩ |
V02 L |
Output Voltage 2 LOW |
I02 = ± 5mA |
I01 |
Output Current 1 |
V01 = ± 100mV |
IL01 |
Leakage Output 1 Current |
VIN = 0, V01 ≤ 3V |
I02 |
Output Current 2 |
V02 = ± 100mV |
VI01 |
Output 1 Dropout Voltage (*) |
I01 = 10mA |
|
|
I01 = 50mA |
VIT |
Input Threshold Voltage |
|
VITH |
Input Threshold Voltage Hyst. |
|
V01 |
Line Regulation |
7V < VIN < 18V, I01 = 5mA |
V02 |
Line Regulation 2 |
7V < VIN < 18V, I02 = 5mA |
V01 |
Load Regulation 1 |
VIN = 8V, 5mA < I01 < 50mA |
V02 |
Load Regulation 2 |
VIN = 8V, 5mA < I02 < 100mA |
IQ |
Quiescent Current |
I02 = I01 ≤ 5mA |
|
|
0 < VIN < 13V |
|
|
7V < VIN < 13V |
IQ1 |
Quiescent Current 1 |
6.3V < VIN1 < 13V, VIN2 = 0 |
|
|
I01 ≤ 5mA, I02 = 0 |
VRT |
Reset Threshold Voltage |
|
VRTH |
Reset Threshold Hysteresis |
|
VRH |
Reset Output Voltage HIGH |
IR = 500μA |
VRL |
Reset Output Voltage LOW |
IR = ± 5mA |
tRD |
Reset Pulse Delay |
Ct = 10nF |
td |
Timing Capacitor Discharge |
Ct = 10nF |
|
Time |
|
Min. |
Typ. |
Max. |
Unit |
|
|
20 |
V |
4.95 |
5.05 |
5.15 |
V |
V01 ±0.1 |
5 |
V01 |
V |
|
0.1 |
|
V |
50 |
|
|
mA |
|
|
1 |
μA |
100 |
|
|
mA |
|
0.7 |
0.8 |
V |
|
0.75 |
0.9 |
V |
V01 + 1.2 |
6.4 |
V01 + 1.7 |
V |
|
250 |
|
mV |
|
5 |
50 |
mV |
|
5 |
50 |
mV |
|
5 |
20 |
mV |
|
10 |
50 |
mV |
|
4.5 |
6.5 |
mA |
|
|
||
|
1.6 |
3.5 |
|
|
0.6 |
0.9 |
mA |
V02 ±0.15 |
4.9 |
V02 ± 0.05 |
V |
30 |
50 |
80 |
mV |
V02 ± 1 |
4.12 |
V02 |
V |
|
0.25 |
0.4 |
V |
3 |
|
11 |
ms |
|
|
20 |
μs |
V01 |
Thermal Drift |
± 20°C ≤<0>Tamb ≤ 125°C |
|
0.3 |
mV/°C |
T |
|
±0.8 |
|||
|
|
|
|
||
V02 |
Thermal Drift |
± 20°C ≤<0>Tamb ≤ 125°C |
|
0.3 |
mV/°C |
T |
|
± 0.8 |
|||
|
|
|
|
||
SVR1 |
Supply Voltage Rejection |
f = 100Hz, VR = 0.5V, Io = 50mA |
50 |
84 |
dB |
SVR2 |
Supply Voltage Rejection |
f = 100Hz, VR = 0.5V, Io = 100mA |
50 |
80 |
dB |
* The dropout voltage is defined as the difference between the input and the output voltage when the output voltage is lowered of 25 mV under constant output current condition.
3/9