LT3757(RevB) Просмотр технического описания (PDF) - Linear Technology
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LT3757 Datasheet PDF : 36 Pages
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LT3757
Electrical Characteristics The l denotes the specifications which apply over the full operating temp-
erature range, otherwise specifications are at TA = 25°C. VIN = 24V, SHDN/UVLO = 24V, SENSE = 0V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VIN Operating Range
2.9
40
V
VIN Shutdown IQ
SHDN/UVLO = 0V
SHDN/UVLO = 1.15V
0.1
1
µA
6
µA
VIN Operating IQ
VC = 0.3V, RT = 41.2k
1.6
2.2
mA
VIN Operating IQ with Internal LDO Disabled
SENSE Current Limit Threshold
VC = 0.3V, RT = 41.2k, INTVCC = 7.5V
280
400
µA
l 100
110
120
mV
SENSE Input Bias Current
Current Out of Pin
–65
µA
Error Amplifier
FBX Regulation Voltage (VFBX(REG))
FBX Overvoltage Lockout
FBX Pin Input Current
Transconductance gm (∆IVC /∆VFBX)
VFBX > 0V (Note 3)
VFBX < 0V (Note 3)
VFBX > 0V (Note 4)
VFBX < 0V (Note 4)
VFBX = 1.6V (Note 3)
VFBX = –0.8V (Note 3)
(Note 3)
l 1.569 1.6 1.631
V
l –0.816 –0.80 –0.784
V
6
8
10
%
7
11
14
%
70
100
nA
–10
10
nA
230
µS
VC Output Impedance
(Note 3)
5
MΩ
VFBX Line Regulation [∆VFBX /(∆VIN • VFBX(REG))]
VC Current Mode Gain (∆VVC /∆VSENSE)
VC Source Current
VC Sink Current
Oscillator
VFBX > 0V, 2.9V < VIN < 40V (Notes 3, 7)
VFBX < 0V, 2.9V < VIN < 40V (Notes 3, 7)
VFBX = 0V, VC = 1.5V
VFBX = 1.7V
VFBX = –0.85V
0.002 0.056
%/ V
0.0025 0.05
%/ V
5.5
V/ V
–15
µA
12
µA
11
µA
Switching Frequency
RT Voltage
Minimum Off-Time
RT = 41.2k to GND, VFBX = 1.6V
RT = 140k to GND, VFBX = 1.6V
RT = 10.5k to GND, VFBX = 1.6V
VFBX = 1.6V
270
300
330
kHz
100
kHz
1000
kHz
1.2
V
220
ns
Minimum On-Time
220
ns
SYNC Input Low
0.4
V
SYNC Input High
1.5
V
SS Pull-Up Current
SS = 0V, Current Out of Pin
–10
µA
Low Dropout Regulator
INTVCC Regulation Voltage
INTVCC Undervoltage Lockout Threshold
Falling INTVCC
UVLO Hysteresis
l
7
7.2
7.4
V
2.6
2.7
2.8
V
0.1
V
INTVCC Overvoltage Lockout Threshold
INTVCC Current Limit
INTVCC Load Regulation (∆VINTVCC / VINTVCC)
INTVCC Line Regulation ∆VINTVCC /(VINTVCC • ∆VIN)
VIN = 40V
VIN = 15V
0 < IINTVCC < 20mA, VIN = 8V
8V < VIN < 40V
16
17.5
V
30
40
55
mA
95
mA
–0.9 –0.5
%
0.008 0.03
%/V
Dropout Voltage (VIN – VINTVCC)
VIN = 6V, IINTVCC = 20mA
400
mV
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