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参数资料
| 型号： | LTC1922IG-1#TR |
| 厂商： | Linear Technology |
| 文件页数： | 3/24页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR ISO PWM 20-SSOP |
| 标准包装： | 1,800 |
| PWM 型： | 电流/电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 占空比： | 99% |
| 电源电压： | 3.8 V ~ 10.3 V |
| 降压： | 无 |
| 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 ~ 85°C |
| 封装/外壳： | 20-SSOP（0.209"，5.30mm 宽） |
| 包装： | 带卷 (TR) |
LTC1922-1
ELECTRICAL CHARACTERISTICS
The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at V CC = 9.5V, C T = 180pF, T A = T MIN to T MAX unless other wise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Oscillator
OSCT
OSCV
OSYT
Total Variation
C T RAMP Amplitude
SYNC Threshold
V CC = 6.5V to 9.5V
Measured on C T
Measured on SYNC
q
236
3.6
1.6
277
3.85
1.8
319
4.2
2.2
kHz
V
V
OSYW
OSYWX
OSOP
Minimum SYNC Pulse Width
Maximum SYNC Pulse Width
SYNC Output Pulse Width
Measured at Outputs (Note 2)
Measured on Outputs, C T = 180pF
Measured on SYNC, R SYNC = 5.1k
6
170
1.3
ns
μ s
ns
Error Amplifier
V FB
FB Input Voltage
COMP = 2.5V (Note 3)
1.179
1.204
1.229
V
FBI
AVOL
FB Input Range
Open-Loop Gain
Measured on FB (Note 4)
COMP = 1V to 3V (Note 3)
–0.3
70
90
2.5
V
dB
I IB
Input Bias Current
COMP = 2.5V (Note 3)
5
50
nA
V OH
Output High
Load on COMP = –100 μ A
4.7
4.92
V
V OL
Output Low
Load on COMP = 100 μ A
0.18
0.4
V
I SOURCE
I SINK
Output Source Current
Output Sink Current
COMP = 2.5V
COMP = 2.5V
– 400
3
– 800
7
μ A
mA
Reference
V REF
Initial Accuracy
T A = 25 ° C, Measured on V REF
4.925
5
5.075
V
REFTV
REFLD
REFLN
REFSC
Total Variation
Load Regulation
Line Regulation
Short-Circuit Current
Line, Load and Temperature
Load on V REF = 100 μ A to 5mA
V CC = 6.5V to 9.5V
V REF Shorted to GND
q
4.9
18
5
2
0.1
30
5.1
15
10
45
V
mV
mV
mA
Outputs
OUTH(X)
Output High Voltage
I OUT(X) = –50mA
7.9
8.4
V
OUTL(X)
R HI(X)
R LO(X)
t r(X)
t f(X)
Output Low Voltage
Pull-Up Resistance
Pull-Down Resistance
Rise Time
Fall Time
I OUT(X) = 50mA
I OUT(X) = –50mA to –10mA
I OUT(X) = –50mA to –10mA
C OUT(X) = 50pF
C OUT(X) = 50pF
0.6
22
12
5
5
1
30
20
15
15
V
?
?
ns
ns
Current Limit and Shutdown
CLPP
CLSD
SSI
SSR
FLT
Pulse-by-Pulse Current Limit Threshold
Shutdown Current Limit Threshold
Soft-Start Current
Soft-Start Reset Threshold
FAULT Reset Threshold
Measured on CS
Measured on CS
SS = 2.5V
Measured on SS
Measured on SS
0.34
0.55
7
0.7
4.4
0.415
0.64
12
0.4
4.1
0.48
0.73
17
0.1
3.8
V
V
μ A
V
V
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: SYNC pulse width is valid from >20ns and <0.4 ? (1/f OSC ),
V SYNC = 0V to 5V.
Note 3: FB is driven by a servo loop amplifier to control V COMP for these
tests.
Note 4: Set FB to –0.3V, 2.5 and insure that COMP does not phase invert.
Note 5: The LTC1922-1E is guaranteed to meet performance specifications
from 0 ° C to 85 ° C. Specification over the –40 ° C to 85 ° C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LTC1922-1I is guaranteed and tested
over the – 40 ° C to 85 ° C operating temperature range.
3
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