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参数资料
| 型号： | LTC1707CS8#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 0.6A 8SOIC |
| 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 ~ 8.5 V |
| 输入电压： | 2.85 V ~ 8.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 35kHz ~ 350kHz |
| 电流 - 输出： | 600mA |
| 同步整流器： | 是 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-SOIC |
LTC1707
OPERATIO
Frequency synchronization is inhibited when the feedback
voltage V FB is below 0.6V. This prevents the external clock
from interfering with the frequency foldback for short-
circuit protection.
Dropout Operation
When the input supply voltage decreases toward the out-
put voltage, the duty cycle increases toward the maximum
on-time. Further reduction of the supply voltage forces the
switch is on continuously. Hence, the I 2 R loss is due
mainly to the R DS(ON) of the P-channel MOSFET. See
Efficiency Considerations in the Applications Information
section.
Below V IN = 4V, the output current must be derated as
shown in Figures 2a and 2b. For applications that require
500mA below V IN = 4V, select the LTC1627.
1200
main switch to remain on for more than one cycle until it
reaches 100% duty cycle. The output voltage will then be
determined by the input voltage minus the voltage drop
across the P-channel MOSFET and the inductor.
In Burst Mode operation or pulse skipping mode operation
1000
800
600
400
V OUT = 1.8V
V OUT = 1.5V
V OUT = 3.3V
V OUT = 5V
with the output lightly loaded, the LTC1707 transitions
through continuous mode as it enters dropout.
200
V OUT = 2.5V
V OUT = 2.9V
T J = 25 ° C
L = 15 μ H
EXT SYNC AT 400kHz
Undervoltage Lockout
0
2.5
3.5
4.5
5.5
6.5
7.5
8.5
INPUT VOLTAGE (V)
A precision undervoltage lockout shuts down the LTC1707
when V IN drops below 2.7V, making it ideal for single
lithium-ion battery applications. In lockout, the LTC1707
draws only several microamperes, which is low enough to
prevent deep discharge and possible damage to the lithium-
ion battery nearing its end of charge. A 100mV hysteresis
ensures reliable operation with noisy input supplies.
Low Supply Operation
The LTC1707 is designed to operate down to a 2.85V input
voltage. At this voltage the converter is most likely to be
running at high duty cycles or in dropout where the main
1707 F02b
Figure 2b. Maximum Output Current
vs Input Voltage (Synchronized)
Slope Compensation and Inductor Peak Current
Slope compensation provides stability by preventing sub-
harmonic oscillations. It works by internally adding a ramp
to the inductor current signal at duty cycles in excess of
40%. As a result, the maximum inductor peak current is
lower for V OUT /V IN > 0.4 than when V OUT /V IN < 0.4. See the
inductor peak current as a function of duty cycle graph in
Figure 3. The worst-case peak current reduction occurs
1200
1000
1000
V OUT = 1.8V
800
V OUT = 1.5V
900
WITHOUT
EXTERNAL
600
V OUT = 5 V
800
WORST-CASE
CLOCK SYNC
400
V OUT = 3.3V
V OUT = 2.5V
700
EXTERNAL
CLOCK SYNC
200
V OUT = 2.9V
T J = 25 ° C
L = 15 μ H
600
0
2.5
3.5
4.5 5.5 6.5
INPUT VOLTAGE (V)
7.5
8.5
500
0
V IN = 4V
10 20 30 40 50 60 70 80 90 100
1707 F02a
Figure 2a. Maximum Output Current
vs Input Voltage (Unsynchronized)
DUTY CYCLE (%)
1707 F03
Figure 3. Maximum Inductor Peak Current vs Duty Cycle
7
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1707IS8 | 功能描述:IC REG BUCK SYNC ADJ 0.6A 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LTC1707IS8#PBF | 功能描述:IC REG BUCK SYNC ADJ 0.6A 8SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LTC1707IS8#TR | 功能描述:IC REG BUCK SYNC ADJ 0.6A 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LTC1707IS8#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 0.6A 8SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LTC1707IS8PBF | 制造商:Linear Technology 功能描述:DC-DC Converter Step-Down 2.85-8.5V SO8 |
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