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参数资料
| 型号： | LT3695IMSE-5#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 24/30页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 5V 1A 16MSOP |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 5V |
| 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
+ R2, and the BD pin (if connected to V OUT ) in the case of
the LT3695, or by R LOAD , R4 and the OUT1,2 pins in the
Without load (R LOAD = ∞) and assuming the minimum
current of 43μA into the OUT1,2 pins, this leads to:
case of the LT3695-3.3 and LT3695-5. Since this causes
V OUT to rise, the LT3695 regulators stop switching. The
resistive divider formed by R3, R LOAD and R1 + R2 and
R4, respectively, must be adjusted for V OUT not to exceed
R 4 ≤
V OUT
V IN ( MAX ) – V OUT
R 3
– 43 μA
its nominal value at the required maximum input voltage
V IN(MAX) . R3 must supply suf?cient current into RUN/SS
at the required minimum input voltage V IN(MIN) for normal
non-fault situations. Based on the maximum RUN/SS cur-
rent of 7.5μA at V RUN/SS = 2.5V this gives
as upper limit for R4. Depending on the required input
voltage range, R4 may be omitted.
Tables 7 and 8 show example values for common appli-
cations. R SS must be included as the switch node would
R 3 ≤
V IN ( MIN ) – 2 . 5 V
7 . 5 μA
otherwise have to charge C SS if the SW pin and the RUN/SS
pin are shorted, which may damage the power switch.
If RUN/SS is controlled by an external circuitry, the current
The current through R3 is maximal at V IN(MAX) with RUN/SS
shorted to SW:
this circuitry can supply must be limited. This can be done
as discussed above. In addition, it may be necessary to
I R 3 =
V IN ( MAX ) – V OUT
R 3
protect this external circuitry from the voltage at SW, for
example by using a diode.
Table 7. LT3695: Example Values for R1, R2 and R3 for Common
I R 3 ≤
+ I BD
For the LT3695, this current must be drawn by R LOAD ,
R1 + R2, and the BD pin, if connected to V OUT :
V OUT
R LOAD || ( R 1 + R 2 )
Combinations of V IN and V OUT . I R1+R2 is the Current Drawn by
R1 + R2 in Normal Operation
V IN(MAX) V IN(MIN) V OUT R3 R1 R2 I R1+R2
(V) (V) (V) (kΩ) (kΩ) (kΩ) (μA)
16 3.8 1.8 169 11.5 9.09 87
36 3.8 1.8 169 4.75 3.74 212
Without load (R LOAD = ∞) and assuming the minimum
current of 35μA into the BD pin, this leads to
16
36
4.5
4.5
2.5
2.5
261
261
93.1
16.9
43.2
7.87
18
101
R 1 + R 2 ≤
V OUT
V IN ( MAX ) – V OUT
R 3
– 35 μA
16
36
16
36
5.3
5.3
7
7
3.3
3.3
5
5
365
365
274
590
432
43.2
536
221
137
13.7
102
42.2
6
58
8
19
as upper limit for the feedback resistors. For V OUT < 2.5V
assume no current drawn by the BD pin, which gives
16
36
27
10
10
14
8
8
12
200
475
301
562
280
511
61.9
30.9
36.5
13
26
22
R 1 + R 2 ≤
V OUT ? R 3
V IN ( MAX ) – V OUT
36
14
12
442
511
36.5
22
For the LT3695-3.3 and LT3695-5, the current through R3
must be drawn by R LOAD , R4 and the OUT1,2 pins:
I R 3 ≤
V OUT
R LOAD || R 4
+ I OUT 12 ,
3695fa
24
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