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| 型号： | LTC3801ES6#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 2/12页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM TSOT23-6 |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 650kHz |
| 占空比： | 100% |
| 电源电压： | 2.4 V ~ 9.8 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： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | SOT-23-6 细型，TSOT-23-6 |
| 包装： | 带卷 (TR) |
LTC3801/LTC3801B
NUMBER
LTC3801ES6
LTC3801BES6
LTACR
ABSOLUTE M AXI M U M RATINGS
(Note 1)
Input Supply Voltage (V IN )........................ – 0.3V to 10V
SENSE – , PGATE Voltages ............ – 0.3V to (V IN + 0.3V)
V FB , I TH /RUN Voltages ............................. – 0.3V to 2.4V
PGATE Peak Output Current (<10 μ s) ........................ 1A
Operating Temperature Range (Note 2) .. – 40 ° C to 85 ° C
Junction Temperature (Note 3) ............................ 150 ° C
Storage Temperature Range ................. – 65 ° C to 150 ° C
Lead Temperature (Soldering, 10 sec).................. 300 ° C
PACKAGE/ORDER I N FOR M ATIO N
ORDER PART
TOP VIEW
I TH /RUN 1 6 PGATE
GND 2 5 V IN
V FB 3 4 SENSE –
S6 PACKAGE S6 PART MARKING
6-LEAD PLASTIC TSOT-23
T JMAX = 150 ° C, θ JA = 230 ° C/W
LTAHN
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The q indicates specifications which apply over the full operating
temperature range, otherwise specifications are at T A = 25 ° C. V IN = 4.2V unless otherwise noted. (Note 2)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Input Voltage Range
Input DC Supply Current
Normal Operation
SLEEP Mode
Shutdown
UVLO
Typicals at V IN = 4.2V (Note 4)
2.4V ≤ V IN ≤ 9.8V, V ITH /RUN = 1.3V
2.4V ≤ V IN ≤ 9.8V (LTC3801 Only)
2.4V ≤ V IN ≤ 9.8V, V ITH /RUN = 0V (LTC3801)
2.4V ≤ V IN ≤ 9.8V, V ITH /RUN = 0V (LTC3801B)
V IN < UVLO Threshold
q
2.4
195
16
6
8
1
9.8
300
30
15
17
2
V
μ A
μ A
μ A
μ A
μ A
Undervoltage Lockout Threshold
Start-Up Current Source
V IN Rising
V IN Falling
V ITH /RUN = 0V (LTC3801)
V ITH /RUN = 0V (LTC3801B)
q
q
0.5
1.0
1.8
1.7
1
2
2.3
2.2
1.5
3.0
V
V
μ A
μ A
Shutdown Threshold (at I TH /RUN)
Regulated Feedback Voltage
V ITH /RUN Rising
0 ° C ≤ T A ≤ 85 ° C (Note 5)
–40 ° C ≤ T A ≤ 85 ° C (Note 5)
q
q
0.3
0.788
0.780
0.6
0.800
0.800
0.95
0.812
0.812
V
V
V
Feedback Voltage Line Regulation
Feedback Voltage Load Regulation
2.4V ≤ V IN ≤ 9.8V (Note 5)
I TH /RUN Sinking 5 μ A (Note 5)
I TH /RUN Sourcing 5 μ A (Note 5)
0.05
2
2
mV/V
mV/ μ A
mV/ μ A
V FB Input Current
(Note 5)
2
10
nA
Overvoltage Protect Threshold
Measured at V FB
0.850
0.880
0.910
V
Overvoltage Protect Hysteresis
Oscillator Frequency
40
mV
Normal Operation
Output Short Circuit
Gate Drive Rise Time
Gate Drive Fall Time
V FB = 0.8V
V FB = 0V
C LOAD = 3000pF
C LOAD = 3000pF
500
550
210
40
40
650
kHz
kHz
ns
ns
Peak Current Sense Voltage
Duty Cycle < 40% (Note 6)
Peak Current Sense Voltage in Burst Mode Operation
LTC3801
LTC3801B
LTC3801 Only
q
q
109
95
117
104
26
125
113
mV
mV
mV
Default Soft-Start Time
0.6
ms
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC3801ES6/LTC3801BES6 are guaranteed to meet specifica-
tions 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.
Note 3: T J is calculated from the ambient temperature T A and power
dissipation P D according to the following formula:
T J = T A + (P D ? θ JA ° C/W)
Note 4: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
Note 5: The LTC3801/LTC3801B are tested in a feedback loop that servos
V FB to the output of the error amplifier while maintaining I TH /RUN at the
midpoint of the current limit range.
Note 6: Peak current sense voltage is reduced dependent on duty cycle as
given in Figure 1.
sn3801 3801fs
2
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