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| 型号： | LT1339ISW#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 3/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST PWM CM 20-SOIC |
| 标准包装： | 1,000 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 150kHz |
| 占空比： | 90% |
| 电源电压： | 最高 60V |
| 降压： | 无 |
| 升压： | 是 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 20-SOIC（0.295"，7.50mm 宽） |
| 包装： | 带卷 (TR) |
LT1339
ELECTRICAL C HARA C TERISTICS
12V IN = V BOOST = 12V, V C = 2V, TS = 0V, V FB = V REF = 1.25V, C TG = C BG = 3000pF, T A = 25 ° C unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Error Amplifier
V FB
Error Amplifier Reference Voltage
Measured at Feedback Pin
q
1.242
1.235
1.250
1.250
1.258
1.265
V
V
I FB
g m
A V
I VC
Feedback Input Current
Error Amplifier Transconductance
Error Amplifier Voltage Gain
Error Amplifier Source Current
Error Amplifier Sink Current
V FB = V REF
V FB – V REF = 500mV
q
q
q
q
q
0.1
1200
1500
200
280
0.5
2000
3000
275
400
1.0
3200
μ A
μ mho
V/V
μ A
μ A
V VC
Absolute V C Clamp Voltage
Measured at V C Pin
3.5
V
V SENSE
Peak Current Limit Threshold
Measured at Sense Inputs
q
170
190
mV
V IAVG
Average Current Limit Threshold (Note 4)
Average Current Limit Threshold
Measured at Sense Inputs
Measured at I AVG Pin
q
110
120
2.5
130
mV
V
Current Sense Amplifier
A V
Amplifier DC Gain
Measured at I AVG Pin
15
V/V
V OS
Amplifier Input Offset Voltage
2V < V CMSENSE < 60V,
SENSE + – SENSE – = 5mV
q
0.1
mV
I B
Input Bias Current
Sink (V CMSENSE > 5V)
Source (V CMSENSE = 0V)
q
q
45
700
75
1200
μ A
μ A
Oscillator
f O
Operating Frequency, Free Run
Frequency Programming Error (Note 3)
f O ≤ 150kHz
q
q
–5
150
5
kHz
%
I CT
V SYNC
f SYNC
Timing Capacitor Discharge Current
SYNC Input Threshold
SYNC Frequency Range
LT1339C
LT1339I
Rising Edge
f SYNC ≤ 150kHz
q
q
q
q
2.20
2.10
0.8
f O
2.50
2.50
2.75
2.75
2.0
1.4f O
mA
mA
V
Output Drivers
V TG,BG
Undervoltage Output Clamp
Standby Mode Output Clamp
12V IN ≤ 8V
V RUN < 0.5V
q
q
0.4
0.7
0.1
V
V
V TG
t TGR
t TGF
V BG
t BGR
t BGF
Top Gate On Voltage
Top Gate Off Voltage
Top Gate Rise Time
Top Gate Fall Time
Bottom Gate On Voltage
Bottom Gate Off Voltage
Bottom Gate Rise Time
Bottom Gate Fall Time
q
q
q
q
q
q
q
q
11.0
11.0
11.9
0.4
130
60
11.9
0.4
70
60
12.0
0.7
200
140
12.0
0.7
200
140
V
V
ns
ns
V
V
ns
ns
The q denotes specifications which apply over the full operating
temperature range.
Note 1: Absolute maximum ratings are those values beyond which the life
of a device may be impaired.
Note 2: Supply current specification does not include external FET gate
charge currents. Actual supply currents will be higher and vary with
operating frequency, operating voltages and the type of external FETs
used. See Application Information section.
Note 3: Test condition: R CT = 16.9k, C CT = 1000pF.
Note 4: Test Condition: V CMSENSE = 10V.
sn1339 1339fas
3
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