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參數(shù)資料
| 型號： | LTC3890EGN-1#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, PDSO28 |
| 封裝： | LEAD FREE, PLASTIC, SSOP-28 |
| 文件頁數(shù)： | 23/36頁 |
| 文件大小： | 498K |
| 代理商： | LTC3890EGN-1#PBF |
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LTC3890-1
3
38901f
ELECTRICAL CHARACTERISTICS The l denotes the specications which apply over the full operating
junction temperature range, otherwise specications are at TJ = 25°C. VIN = 12V, VRUN1,2 = 5V, EXTVCC = 0V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
gm1,2
Transconductance Amplier gm
ITH1,2 = 1.2V, Sink/Source = 5μA (Note 4)
2
mmho
IQ
Input DC Supply Current
(Note 5)
Pulse Skip or Forced Continuous Mode
(One Channel On)
RUN1 = 5V and RUN2 = 0V or
RUN1 = 0V and RUN2 = 5V,
VFB1 = 0.83V (No Load)
2mA
Pulse Skip or Forced Continuous Mode
(Both Channels On)
RUN1,2 = 5V, VFB1,2 = 0.83V (No Load)
2
mA
Sleep Mode (One Channel On)
RUN1 = 5V and RUN2 = 0V or
RUN1 = 0V and RUN2 = 5V,
VFB1 = 0.83V (No Load)
50
75
μA
Sleep Mode (Both Channels On)
RUN1,2 = 5V, VFB1,2 = 0.83V (No Load)
60
100
μA
Shutdown
RUN1,2 = 0V
14
25
μA
UVLO
Undervoltage Lockout
INTVCC Ramping Up
INTVCC Ramping Down
l
3.6
4.0
3.8
4.2
4.0
V
VOVL
Feedback Overvoltage Protection
Measured at VFB1,2, Relative to Regulated VFB1,2
710
13
%
ISENSE+
SENSE+ Pin Current
Each Channel
±1
μA
ISENSE–
SENSE– Pins Current
Each Channel
VSENSE– < INTVCC – 0.5V
VSENSE– > INTVCC + 0.5V
700
±1
μA
DFMAX
Maximum Duty Factor
In Dropout
98
99
%
ITRACK/SS1,2
Soft-Start Charge Current
VTRACK1,2 = 0V
0.7
1.0
1.4
μA
VRUN1 On
VRUN2 On
RUN1 Pin On Threshold
RUN2 Pin On Threshold
VRUN1 Rising
VRUN2 Rising
l
1.15
1.20
1.21
1.25
1.27
1.30
V
VRUN1,2 Hyst RUN Pin Hysteresis
50
mV
VSENSE(MAX)
Maximum Current Sense Threshold
VFB1,2 = 0.7V, VSENSE1–,2– = 3.3V, ILIM = 0
l
64
75
85
mV
Gate Driver
TG1,2
Pull-Up On-Resistance
Pull-Down On-Resistance
2.5
1.5
Ω
BG1,2
Pull-Up On-Resistance
Pull-Down On-Resistance
2.4
1.1
Ω
TG1,2 tr
TG1,2 tf
TG Transition Time:
Rise Time
Fall Time
(Note 6)
CLOAD = 3300pF
25
ns
BG1,2 tr
BG1,2 tf
BG Transition Time:
Rise Time
Fall Time
(Note 6)
CLOAD = 3300pF
25
ns
TG/BG t1D
Top Gate Off to Bottom Gate On Delay
Synchronous Switch-On Delay Time
CLOAD = 3300pF Each Driver
30
ns
BG/TG t1D
Bottom Gate Off to Top Gate On Delay
Top Switch-On Delay Time
CLOAD = 3300pF Each Driver
30
ns
tON(MIN)
Minimum On-Time
(Note 7)
95
ns
INTVCC Linear Regulator
VINTVCCVIN
Internal VCC Voltage
6V < VIN < 60V, VEXTVCC = 0V
4.85
5.1
5.35
V
VLDOVIN
INTVCC Load Regulation
ICC = 0mA to 50mA, VEXTVCC = 0V
0.7
1.1
%
VINTVCCEXT
Internal VCC Voltage
6V < VEXTVCC < 13V
4.85
5.1
5.35
V
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