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| 型号： | LTC3801ES6#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 6/12页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM TSOT23-6 |
| 标准包装： | 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) |
| 其它名称： | LTC3801ES6#PBF LTC3801ES6#PBF-ND |
LTC3801/LTC3801B
OPERATIO
(Refer to the Functional Diagram)
V OUT Ripple for Front Page Circuit Using the LTC3801
(with Burst Mode Operation)
20mV AC /DIV
V OUT Ripple for Front Page Circuit Using the LTC3801B
(Burst Mode Operation Disabled)
20mV AC /DIV
V IN = 4.2V
V OUT = 2.5V
I OUT = 100mA
5 μ s/DIV
3801 F01a
V IN = 4.2V
V OUT = 2.5V
I OUT = 100mA
5 μ s/DIV
3801 F01b
Figure 1. Output Ripple Waveforms for the Front Page Circuit
100
95
90
85
80
75
70
65
60
V OUT = 2.5V
V IN = 4.2V
V IN = 6.6V
V IN = 3.3V
V IN = 9.8V
V IN = 8.4V
This lower frequency allows the inductor current to safely
discharge, thereby preventing current runaway. After the
short is removed, the oscillator frequency will gradually
increase back to 550kHz as V FB rises through 0.3V on its
way back to 0.8V.
Overvoltage Protection
If V FB exceeds its regulation point of 0.8V by more than
55
10% for any reason, such as an output short circuit to a
50
0.1
1
10
100 1000
10000
higher voltage, the overvoltage comparator will hold the
LOAD CURRENT (mA)
3801 F02
external P-channel MOSFET off. This comparator has a
typical hysteresis of 40mV.
Figure 2. LTC3801B Efficiency vs Load Current
Slope Compensation and Inductor’s Peak Current
Undervoltage Lockout Protection
The switch on duty cycle in normal operation is given by:
To prevent operation of the external P-channel MOSFET
with insufficient gate drive, an undervoltage lockout cir-
cuit is incorporated into the LTC3801/LTC3801B. When
Duty Cycle =
V OUT + V D
V IN + V D
I MAX =
theinputsupplyvoltagedropsbelowapproximately1.7V,
the P-channel MOSFET and all internal circuitry other than
the undervoltage block itself are turned off. Input supply
current in undervoltage is approximately 1 μ A.
Short-Circuit Protection
If the output is shorted to ground, the frequency of the
oscillator is folded back from 550kHz to approximately
210kHz while maintaining the same minimum on time.
where V D is the forward voltage drop of the external diode
at the average inductor current. For duty cycles less than
40%, the inductor’s peak current is determined by:
V ITH / RUN – 0.7 V
10 R SENSE
However, for duty cycles greater than 40%, slope com-
pensation begins and effectively reduces the peak
sn3801 3801fs
6
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