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| 型号： | LT3844IFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 3/24页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST INV PWM 16TSSOP |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 330kHz |
| 占空比： | 95% |
| 电源电压： | 4 V ~ 60 V |
| 降压： | 是 |
| 升压： | 是 |
| 回扫： | 无 |
| 反相： | 是 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 带卷 (TR) |
LT3844
ELECTRICAL CHARACTERISTICS The l denotes the speci?cations which apply over the full operating
temperature range, otherwise speci?cations are at T A = 25°C. V IN = 20V, V CC = BOOST = BURST_EN = 10V, SHDN = 2V, R SET = 49.9k,
SENSE – = SENSE + = 10V, SGND = PGND = S W = SYNC = 0V, unless otherwise noted.
PARAMETER
V CC Operating Voltage Range (Note 5)
V CC Output Voltage
CONDITIONS
Over Full Line and Load Range
l
l
MIN
TYP
8
MAX
20
8.3
UNITS
V
V
V CC UVLO Threshold (Rising)
V CC UVLO Threshold Hysteresis
6.25
500
V
mV
V CC Supply Current (Note 6)
V CC Burst Mode Current
V BURST_EN = 0V
l
1.7
95
2.1
mA
μA
V CC Shutdown Current
V CC Current Limit
V SHDN = 0V
l
–40
20
–120
μA
mA
Error Amp Reference Voltage
Measured at V FB Pin
l
1.224
1.215
1.231
1.238
1.245
V
V
V FB Pin Input Current
V FB = 1.231V
25
nA
SHDN Enable Threshold (Rising)
SHDN Threshold Hysteresis
l
1.3
1.35
120
1.4
V
mV
Sense Pins Common Mode Range
Current Limit Sense Voltage
V SENSE+ – V SENSE–
l
l
0
90
100
36
115
V
mV
Input Current
(I SENSE+ + I SENSE– )
V SENSE(CM) = 0V
V SENSE(CM) = 2V
V SENSE(CM) > 4V
350
–25
–170
μA
μA
μA
Operating Frequency
Minimum Programmable Frequency
Maximum Programmable Frequency
External Sync Frequency Range
l
l
l
l
290
270
500
100
300
310
330
100
600
kHz
kHz
kHz
kHz
kHz
SYNC Input Resistance
40
kΩ
SYNC Voltage Threshold
Soft-Start Capacitor Control Current
l
1.4
2
2
V
μA
Error Amp Transconductance
l
270
340
410
μS
Error Amp DC Voltage Gain
Error Amp Sink/Source Current
62
±30
dB
μA
TG Drive On Voltage (Note 7)
TG Drive Off Voltage
TG Drive Rise/Fall Time
C LOAD = 2200pF
C LOAD = 2200pF
10% to 90% or 90% to 10%, C LOAD = 2200pF
9.8
0.1
40
V
V
ns
Minimum TG Off Time
Minimum TG On Time
l
l
350
250
500
350
ns
ns
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LT3844 includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the speci?ed maximum operating junction
temperature may impair device reliability.
Note 3: The LT3844E is guaranteed to meet performance speci?cations from
0°C to 125°C junction temperature. Speci?cations over the –40°C to 125°C
operating junction temperature range are assured by design, characterization
Note 4 : V IN voltages below the start-up threshold (7.5V) are only
supported when the V CC is externally driven above 6.5V.
Note 5: Operating range is dictated by MOSFET absolute maximum VGS.
Note 6: Supply current speci?cation does not include switch drive
currents. Actual supply currents will be higher.
Note 7: DC measurement of gate drive output “ON” voltage is typically
8.6V. Internal dynamic bootstrap operation yields typical gate “ON”
voltages of 9.8V during standard switching operation. Standard operation
gate “ON” voltage is not tested but guaranteed by design.
Note 8: The –1V absolute maximum on the SW pin is a transient condition.
It is guaranteed by design and not subject to test.
and correlation with statistical process controls. The LT3844I is guaranteed
over the full –40°C to 125°C operating junction temperature range.
3844fb
3
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