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L4978 数据表(PDF) 4 Page - STMicroelectronics

部件名 L4978
功能描述  2A STEP DOWN SWITCHING REGULATOR
PDF  13 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

L4978 数据表(HTML) 4 Page - STMicroelectronics

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L4978
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Table 6. Electrical Characteristcs
(Tj = 25°C, Cosc = 2.7nF, Rosc = 20kΩ, VCC = 24V, unless otherwise specified). “●" Specification Referred
to Tj from 0 to 125°C
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
DYNAMIC CHARACTERISTIC
VI
Operating input voltage range
Vo = 3.3 to 50V; Io = 2A
●
8
55
V
Vo
Output voltage
Io = 0.5A
3.33
3.36
3.39
V
Io = 0.2 to 2A
Vcc = 8 to 55V
3.292
3.36
3.427
V
●
3.22
3.36
3.5
V
Vd
Dropout voltage
Vcc = 10V; Io = 2A
0.58
0.733
V
●
1.173
V
Il
Maximum limiting current
Vcc = 8 to 55V
●
2.5
3
3.5
A
Efficiency
Vo = 3.3V; Io= 2A
87
%
fs
Switching frequency
●
90
100
110
KHz
SVRR
Supply voltage ripple rejection
Vi = Vcc+2VRMS; Vo= Vref;
Io = 2.5A; f ripple= 100Hz
60
dB
Switching Frequency Stability
vs. Vcc
Vcc = 8 to 55V
3
6
%
Temp. stability of switching
frequency
Tj = 0 to 125°C
4
%
SOFT START
Soft start charge current
30
40
50
µA
Soft start discharge current
6
10
14
µA
INHIBIT
VLL
Low level voltage
●
0.9
V
IsLL
Isource Low level
●
5
15
µA
DC CHARACTERISTICS
Iqop
Total operating quiescent
current
4
6
mA
Iq
Quiescent current
Duty Cycle = 0; VFB= 3.8V
2.5
3.5
mA
Iqst-by
Total stand-by quiescent
current
Vinh < 0.9V
100
200
µA
Vcc = 55V; Vinh<0.9V
150
300
µA
ERROR AMPLIFIER
VFB
Voltage Feedback Input
3.33
3.36
3.39
V
RL
Line regulation
Vcc = 8 to 55V
5
10
mV
Ref. voltage stability vs
temperature
●
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



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