參數(shù)資料
型號(hào): L4949
廠商: Motorola, Inc.
元件分類(lèi): 基準(zhǔn)電壓源/電流源
英文描述: MULTIFUNCTION VERY LOW DROPOUT VOLTAGE REGULATOR
中文描述: 多功能非常低壓差穩(wěn)壓器
文件頁(yè)數(shù): 5/8頁(yè)
文件大?。?/td> 191K
代理商: L4949
L4949
5
MOTOROLA ANALOG IC DEVICE DATA
6.0
5.0
4.0
2.0
1.0
1.15
VSI, SENSE INPUT VOLTAGE (V)
1.0
0
TJ = 25
°
C
V
1.2
1.25
1.3
1.35
1.4
1.45
1.5
3.0
Resistor 10 k
from Sense Output
to 5.0 V
1.1
1.05
1.4
1.38
1.36
1.34
1.3
1.28
–40
–20
TJ, JUNCTION TEMPERATURE (
°
C)
1.2
Upper Threshold
V
0
20
40
60
80
100
120
1.32
Lower Threshold
1.26
1.24
1.22
Figure 9. Sense Output versus
Sense Input Voltage
Figure 10. Sense Thresholds versus
Junction Temperature
TYPICAL CHARACTERIZATION CURVES
(continued)
APPLICATION INFORMATION
Supply Voltage Transient
High supply voltage transients can cause a reset output
signal perturbation. For supply voltages greater than 8.0 V
the circuit shows a high immunity of the reset output against
supply transients of more than 100 V/
μ
s. For supply voltages
less than 8.0 V supply transients of more than 0.4 V/
μ
s can
cause a reset signal perturbation. To improve the transient
behavior for supply voltages less than 8.0 V a capacitor at Pin
3 can be used. A capacitor at Pin 3 (C3
1.0
μ
F) reduces
also the output noise.
S
o
VZ
(optional)
Vout
Vout
Vbat
C
s
CO
C3
RSO
10 k
Regulator
1.23 Vref
2.0 V
2.0
μ
A
Reset
1.23 V
Sense
Gnd
Reset
Si
VCC
CT
3
8
4
6
7
5
2
1
VCC
+
+
Preregulator
6.0 V
10 k
Figure 11. Application Schematic
NOTES:
1. For stability: Cs
1.0
μ
F, CO
4.7
μ
F, ESR < 10
at 10 kHz
2. Recommended for application: Cs = CO = 10
μ
F
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