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L4976 数据表(PDF) 7 Page - STMicroelectronics

部件名 L4976
功能描述  1A step down switching regulator
PDF  17 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

L4976 数据表(HTML) 7 Page - STMicroelectronics

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L4976
Electrical characteristics
7/17
Symbol
Parameter
Test condition
Min
Typ
Max
Unit
DC Characteristics
Iqop
Total operating quiescent current
4
6
mA
Iq
Quiescent current
Duty Cycle = 0; VFB = 3.8V
2.5
3.5
mA
Error Amplifier
VFB
Voltage feedback input
3.33
3.36
3.39
V
RL
Line regulation
VCC = 8 to 55V
510
mV
Ref. voltage stability vs
temperature
(1)
0.4
mV/°
C
VoH
High level output voltage
VFB = 2.5V
10.3
V
VoL
Low level output voltage
VFB = 3.8V
0.65
V
IO source
Source output current
Vcomp = 6V; VFB = 2.5V
180
220
µA
IO sink
Sink output current
Vcomp = 6V; VFB = 3.8V
200
300
µA
Ib
Source bias current
2
3
µA
SVRR E/A
Supply voltage ripple rejection
Vcomp = Vfb; VCC = 8 to 55V
60
80
dB
DC open loop gain
RL = ∞
50
57
dB
gm
Transconductance
Icomp = -0.1 to 0.1mA
Vcomp = 6V
2.5
ms
Oscillator section
Ramp valley
0.78
0.85
0.92
V
Ramp peak
VCC = 8V
22.15
2.3
V
VCC = 55V
9
9.6
10.2
V
Maximum duty cycle
95
97
%
Maximum frequency
Duty cycle = 0%
Rosc = 13kW, Cosc = 820pF
300
kHz
1.
Specification refered to Tj from 0 to 125°C
Table 5. Electrical characteristics (continued)
(TJ = 25°C, COSC = 2.7nF, ROSC = 20kΩ, VCC = 24V, unless otherwise specified.)



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