3694 查看數據表（PDF） - Linear Technology
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3694 Datasheet PDF : 28 Pages
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LT3694/LT3694-1
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C, VIN = 12V, VBIAS = 3V, unless otherwise noted. (Notes 2, 9)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VIN Internal Undervoltage Lockout
l 3.5
3.8
4
V
Overvoltage Shutdown Threshold
l 36
38
40
V
Input Quiescent Current
Not Switching
1
2
mA
Bias Quiescent Current
Not Switching
2
3.5
mA
Shutdown Current
VEN/UVLO = 0.1V
0.1
2
µA
EN/UVLO Threshold, Bias On
350
500
mV
EN/UVLO Threshold, Switching On
l 1.16
1.2
1.23
V
Reference Voltage Line Regulation
Switching Frequency
5V < VIN < 36V
RT = 40.2k
0.01
%/V
l 0.9
1.0
1.1
MHz
SYNC Input Frequency Range
LT3694 Only
l 0.25
2.5
MHz
VIH, SYNC
VIL, SYNC
VOH, CLKOUT
LT3694 Only
LT3694 Only
ICLKOUT = –50µA, LT3694-1 Only
l 1.5
l
l 1.6
V
0.35
V
2.6
V
VOL, CLKOUT
ICLKOUT = 50µA, LT3694-1 Only
l
0.3
V
PGOOD Output Voltage Low
PGOOD Leakage
PGOOD Threshold (Relative to VFB)
Switching Regulator
IPGOOD = 250µA
VPGOOD = 2V
(Note 8)
0.2
0.4
V
10
1000
nA
86
90
94
%
Feedback Pin Voltage
l 735
750
765
mV
Feedback Pin Bias Current
l
–50 –500
nA
Error Amplifier Transconductance
350
µS
Error Amplifier Voltage Gain
600
V/V
TRK/SS Pull-Up Current
–2
–3
–4
µA
TRK/SS Threshold to Start Switching
35
50
70
mV
VC1 Source Current
VC1 Sink Current
VC1 Clamp Voltage
VC = 0.6V
VC = 0.6V
–20
µA
28
µA
2
V
VC1 Switching Threshold
0.75
V
VC1 to Switch Current Gain
Switch Leakage Current
Minimum Boost Voltage Above Switch
VIN = 36V
(Note 4)
3.6
A/V
0.01
10
µA
1.8
2.5
V
Switch Current Limit (Note 3)
(Note 3) 10% Duty Cycle
l 3.5
4.9
6
A
Switch VCESAT
BST Operating Current
VF, BST Diode
IL BST Diode
ISW1 = 3A
ISW1 = 3A
IBST = 100mA
VBST – VBIAS = 36V
600
mV
60
mA
0.8
V
1
µA
DA Current Limit
l 2.6
3.6
4.5
A
Minimum Switch Off-Time
l
140
ns
36941fb
3
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