LT3957AIUHE データシートの表示（PDF） - Linear Technology
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LT3957AIUHE Datasheet PDF : 28 Pages
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LT3957A
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temp-
erature range, otherwise specifications are at TA ≈ TJ = 25°C. VIN = 24V, EN/UVLO = 24V, SENSE2 = 0V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VIN Operating Range
3
40
V
VIN Shutdown IQ
EN/UVLO = 0V
EN/UVLO = 1.15V
0.1
1
μA
6
μA
VIN Operating IQ
VIN Operating IQ with Internal LDO Disabled
SW Pin Current Limit
VC = 0.3V, RT = 41.2k
VC = 0.3V, RT = 41.2k, INTVCC = 5.5V
1.7
2.3
mA
350
400
μA
l
5
5.9
6.8
A
SW Pin On Voltage
SENSE2 Input Bias Current
ISW = 3A
Current Out of Pin
100
mV
–65
μA
Error Amplifier
FBX Regulation Voltage (VFBX(REG))
FBX > 0V (Note 3)
FBX < 0V (Note 3)
l 1.569 1.6 1.631
V
l –0.816 –0.800 –0.784
V
FBX Overvoltage Lockout
FBX > 0V (Note 4)
FBX < 0V (Note 4)
6
8
10
%
7
11
14
%
FBX Pin Input Current
FBX = 1.6V (Note 3)
FBX = –0.8V (Note 3)
70
100
nA
–10
10
nA
Transconductance gm (ΔIVC /ΔFBX)
VC Output Impedance
VFBX Line Regulation (ΔVFBX/[ΔVIN • VFBX(REG)])
VC Current Mode Gain (ΔVVC /ΔVSENSE)
VC Source Current
(Note 3)
(Note 3)
FBX > 0V, 3V < VIN < 40V (Notes 3, 6)
FBX < 0V, 3V < VIN < 40V (Notes 3, 6)
VC = 1.5V, FBX = 0V, Current Out of Pin
230
μS
5
MΩ
0.04 0.06
%/ V
0.03 0.06
%/ V
10
V/ V
–15
μA
VC Sink Current
FBX = 1.7V
FBX = –0.85V
12
μA
11
μA
VC Low Side Clamp Voltage
Oscillator
FBX = 1.65V
0.8
V
Switching Frequency
RT Voltage
RT = 140k to SGND, FBX = 1.6V, VC = 1.5V
RT = 41.2k to SGND, FBX = 1.6V, VC = 1.5V
RT = 10.5k to SGND, FBX = 1.6V, VC = 1.5V
FBX = 1.6V
80
100
120
kHz
270
300
330
kHz
850 1000 1200
kHz
1.2
V
SW Minimum Off-Time
220
275
ns
SW Minimum On-Time
240
320
ns
SYNC Input Low
0.4
SYNC Input High
1.5
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
5
5.2
5.45
V
2.6
2.7
2.85
V
0.15
V
3957afa
3
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