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参数资料
| 型号： | LT3695IMSE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/30页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 1A 16MSOP |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.8 V ~ 20 V |
| 输入电压： | 3.6 V ~ 36 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 250kHz ~ 2.2MHz |
| 电流 - 输出： | 1A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TFSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-MSOP，裸露焊盘 |
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LT3695 Series
APPLICATIONS INFORMATION
R 1 = R 2 ? OUT ? 1 ?
f SW ( MAX ) =
FB Resistor Network (LT3695)
The output voltage of the LT3695 is programmed with a
resistor divider between the output and the FB pin. Choose
the resistor values according to:
? V ?
? 0 . 8 V ?
Reference designators refer to the Block Diagram of the
LT3695. 1% resistors are recommended to maintain output
voltage accuracy.
Setting the Switching Frequency
The LT3695 regulators use a constant-frequency PWM
architecture that can be programmed to switch from
250kHz to 2.2MHz by using a resistor tied from the RT
pin to ground. A table showing the necessary R T value for
a desired switching frequency is in Table 1.
Table 1. Switching Frequency vs R T Value
Operating Frequency Trade-Offs
Selection of the operating frequency is a trade-off between
ef?ciency, component size, minimum dropout voltage and
maximum input voltage. The advantage of high frequency
operation is that smaller inductor and capacitor values may
be used. The disadvantages are lower ef?ciency, lower
maximum input voltage and higher dropout voltage. The
highest acceptable switching frequency (f SW(MAX) ) for a
given application can be calculated as follows:
V OUT + V D
t ON ( MIN ) ( V IN ? V SW + V D )
where V IN is the typical input voltage, V OUT is the output
voltage, V D is the catch diode drop (~0.5V) and V SW is the
internal switch drop (~0.5V at max load). This equation
shows that lower switching frequency is necessary to
safely accommodate high V IN /V OUT ratio. Also, as shown
in the Input Voltage Range section, lower frequency allows
a lower dropout voltage. Input voltage range depends on
SWITCHING FREQUENCY (MHz)
0.25
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.2
1.4
1.6
1.8
2.0
2.2
R T VALUE (kΩ)
158
127
90.9
71.5
57.6
47.5
40.2
34
29.4
22.6
18.2
14.7
12.1
9.76
8.06
the switching frequency because the LT3695 regulators’
switch has ?nite minimum on and off times. An internal
timer forces the switch to be off for at least t OFF(MIN) per
cycle; this timer has a maximum value of 210ns (250ns
for T J > 125°C). On the other hand, delays associated with
turning off the power switch dictate the minimum on-time,
t ON(MIN) , before the switch can be turned off; t ON(MIN) has a
maximum value of 150ns over temperature. The minimum
and maximum duty cycles that can be achieved taking
minimum on and off times into account are:
DC MIN = f SW t ON(MIN)
DC MAX = 1 – f SW t OFF(MIN)
where f SW is the switching frequency, t ON(MIN) is the
minimum switch on time (150ns), and t OFF(MIN) is the
minimum switch off time (210ns, 250ns for T J > 125°C).
These equations show that the duty cycle range increases
when the switching frequency is decreased.
3695fa
12
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