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| 型号： | LT3804EFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 3/16页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR ISO PWM 28-TSSOP |
| 标准包装： | 2,000 |
| PWM 型： | 电流/电压模式 |
| 输出数： | 2 |
| 频率 - 最大： | 570kHz |
| 占空比： | 80% |
| 电源电压： | 8 V ~ 25 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 28-SOIC（0.173"，4.40mm 宽）裸露焊盘 |
| 包装： | 带卷 (TR) |
LT3804
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T A = 25 ° C. V CC = 11V, GNDS1=GNDS2=0V, operating maximum V CC = 25V, no load
on any outputs, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Opto Driver Amplifier OA1
OA1 Upper Threshold
q
1.4
1.55
1.65
V
OA1 Threshold Hysteresis
0.25
V
OA1 Voltage Gain (V OPTO /V AOUT1 )
V OPTO High
V OPTO Low
1.2V < V OPTO < 4V, R OPTO = 1k
V AOUT1 = 0.9V, I OPTO = –10mA
V FB1 = V REF1 – 10mV, R OPTO = 1k
q
q
q
5.6
4.5
0
6
5.2
0.1
6.4
6
0.25
V
V
V
I OPTO Short-Circuit Current Limit
V FB1 =V REF1 – 10mV, GNDS1 = 0V,
V OPTO = 4V
q
–50
–25
–12
mA
Power Good
Power Good Window Threshold
(PGIN1-GNDS1, PGIN2-GNDS2)
Input Current (PGIN1,PGIN2)
–100mV < GNDS1, GNDS2 < 100mV
0V < PGIN1, PGIN2 < 1V
0.85
0.2
1.15
0.35
V REF
μ A
Delay Time for Power Bad
Output Low (PGOOD)
25mV Overdrive on PGIN1,PGIN2
2mA into the Pin
q
q
100
200
150
300
300
μ s
mV
Current Limit Amplifier CA1, CA2
Current Limit Threshold (CL1P-CL1N, CL2P-CL2N)
Common Mode Voltage from 0V to V CC – 2.5V
V AOUT1 = 1.2V, V AOUT2 = 2.5V,
q
40
50
60
mV
BGATE Off Threshold at (V CL2P -V CL2N ), BGS Pin Float
Commond Mode Voltage from 0V to V CC – 2.5V
0
8
15
mV
Switching Off Threshold at I LCOMP2
Input Current (CL1P, CL1N, CL2P, CL2N)
V ILCOMP2
V CL2P = V CL1N , V CL2P = V CL2N
100
0.15
V
μ A
Oscillator
Switching Frequency
Synchronization Frequency Range
CSET Ramp Valley Voltage
C S = 500pF (NO SYNC)
C S = 333pF (NO SYNC)
C S = 200pF (NO SYNC)
C S = 500pF
C S = 333pF
C S = 200pF
C S = 1000pF (NO SYNC)
q
q
q
q
q
q
170
240
400
245
345
575
0.90
200
280
470
1.15
240
340
570
400
500
800
1.4
kHz
kHz
kHz
kHz
kHz
kHz
V
CSET Peak-to-Peak Voltage
Synchronization Pulse Threshold on SYNC Pin
C S = 1000pF (NO SYNC)
Falling Edge V SYNC
2.4
2.5
V
V
Maximum Duty Cycle
V FB2 = V REF2 – 5mV, C S > 333pF
q
75
80
%
Gate Drivers (TGATE, BGATE)
V GBIAS
V TGATE High (V TGATE – V SW )
V BGATE High
V TGATE Low (V TGATE -V SW )
V BGATE Low
I GBIAS < 25mA
I TGATE < 50mA, V BOOST = V GBIAS – 0.5V
I BGATE < 50mA
I TGATE < –50mA
I BGATE < 50mA
q
q
q
q
7.5
5
5
8
6
6
8.5
7.5
7.5
0.5
0.5
V
V
V
V
V
Peak Gate Drive Current
Gate Drive Rise and Fall Time
10nF Load
1nF Load
1
25
A
ns
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: If highter than 30V on SYNC pin is needed, add a 10k ? resistor in
series with the pin.
Note 3: The LT3804E is guaranteed to meet performance specifications
from 0 ° C to 70 ° C. Specifications over the – 40 ° C to 85 ° C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
3804i
3
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