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參數(shù)資料
| 型號： | LT3958IUHE#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, PQCC36 |
| 封裝： | 5 X 6 MM, LEAD FREE, PLASTIC, QFN-36 |
| 文件頁數(shù)： | 22/28頁 |
| 文件大小： | 320K |
| 代理商： | LT3958IUHE#PBF |
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LT3958
3
3958f
ELECTRICAL CHARACTERISTICS The l denotes the specications which apply over the full operating temp-
erature range, otherwise specications are at TA = 25°C. VIN = 24V, EN/UVLO = 24V, SENSE2 = 0V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VIN Operating Range
580
V
VIN Shutdown IQ
EN/UVLO = 0V
EN/UVLO = 1.15V
0.1
1
6
μA
VIN Operating IQ
VC = 0.3V, RT = 41.2k
1.6
2.2
mA
VIN Operating IQ with Internal LDO Disabled
VC = 0.3V, RT = 41.2k, INTVCC = 7.5V
350
400
μA
SW Pin Current Limit
SENSE2 = SENSE1
l
3.3
4.0
4.6
A
SW Pin On Voltage
ISW = 2A
180
mV
SENSE2 Input Bias Current
Current Out of Pin
–65
μA
Error Amplier
FBX Regulation Voltage (VFBX(REG))
FBX > 0V (Note 3)
FBX < 0V (Note 3)
l
1.569
–0.816
1.6
–0.800
1.631
–0.784
V
FBX Overvoltage Lockout
FBX > 0V (Note 4)
FBX < 0V (Note 4)
6
7
8
11
10
14
%
FBX Pin Input Current
FBX = 1.6V (Note 3)
FBX = –0.8V (Note 3)
–10
70
100
10
nA
Transconductance gm (ΔIVC/ΔFBX)
(Note 3)
230
μS
VC Output Impedance
(Note 3)
5
MΩ
VFBX Line Regulation (ΔVFBX/[ΔVIN VFBX(REG)])
FBX > 0V, 5V < VIN < 80V (Notes 3, 6)
FBX < 0V, 5V < VIN < 80V (Notes 3, 6)
0.006
0.005
0.03
0.038
%/V
VC Current Mode Gain (
ΔVVC/ΔVSENSE)
10
V/V
VC Source Current
VC = 1.5V, FBX = 0V, Current Out of Pin
–15
μA
VC Sink Current
FBX = 1.7V
FBX = –0.85V
12
11
μA
Oscillator
Switching Frequency
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
80
270
850
100
300
1000
120
330
1200
kHz
RT Voltage
FBX = 1.6V
1.2
V
SW Minimum Off-Time
200
275
ns
SW Minimum On-Time
250
300
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
l
7
7.2
7.4
V
INTVCC Undervoltage Lockout Threshold
Falling INTVCC
UVLO Hysteresis
3.55
3.75
0.15
4.00
V
INTVCC Overvoltage Lockout Threshold
11.5
12.8
V
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