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参数资料
| 型号： | LTC3700EMS |
| 厂商： | Linear Technology |
| 文件页数： | 9/16页 |
| 文件大小： | 215K |
| 描述： | IC REG DL BUCK/LINEAR 10MSOP |
| 产品培训模块： | More Information on LDOs |
| 标准包装： | 50 |
| 拓扑： | 降压（降压）（1），线性（LDO）（1） |
| 功能： | 任何功能 |
| 输出数： | 2 |
| 频率 - 开关： | 550kHz |
| 电压/电流 - 输出 1： | 可调至0.8V，5A |
| 电压/电流 - 输出 2： | 可调至0.8V，150mA |
| 带 LED 驱动器： | 无 |
| 带监控器： | 无 |
| 带序列发生器： | 无 |
| 电源电压： | 2.4 V ~ 9.8 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-MSOP |
| 包装： | 管件 |
| 产品目录页面： | 1335 (CN2011-ZH PDF) |
9
LTC3700
3700f
The LDO is protected by both current limit and thermal
shutdown circuits. Current limit is set such that the output
voltage will start dropping out when the load current reaches
approximately 200mA. With a short-circuited LDO output,
the device will limit the sourced current to approximately
225mA. The thermal shutdown circuit has a typical trip
point of 150癈 with a typical hysteresis of 5癈. In thermal
shutdown, the LDO pass device is turned off.
Frequency compensation of the LDO is accomplished by
forcing the dominant pole at the output. For stability, a low
ESR ceramic capacitor e2.2礔 is required from LDO to
GND. For improved transient response, particularly at
heavy loads, it is recommended to use the largest value of
capacitor available in the same size considered.
Both the buck and the LDO share the same internally
generated bandgap reference voltage for their feedback
reference. When both input supplies are present, the
internal reference is powered by the buck input supply
(V
IN
). For this reason, line regulation for the LDO output is
specified both with respect to V
IN
and V
IN2
if the buck is
present and with respect only to V
IN2
if the buck is
disabled. The same is true for V
IN2
supply current, which
will be higher when the buck is disabled by the current
draw of the internal reference.
when the buck is operating below 40% duty cycle. How-
ever, once the duty cycle exceeds 40%, slope com-
pensation begins and effectively reduces the peak induc-
tor current. The amount of reduction is given by the curves
in Figure 2.
Soft-Start
An internal default soft-start circuit is employed at power
up and/or when coming out of shutdown. The soft-start
circuit works by internally clamping the voltage at the I
TH
/
RUN pin to the corresponding zero-current level and
gradually raising the clamp voltage such that the minimum
time required for the programmed switch current to reach
its maximum is approximately 0.5msec. After the soft-
start circuit has timed out, it is disabled until the part is put
in shutdown again or the input supply is cycled.
LDO Regulator
The 150mA low dropout (LDO) regulator on the LTC3700
employs an internal P-channel MOSFET pass device be-
tween its input supply (V
IN2
) and the LDO output pin. The
pass FET has an on-resistance of approximately 1.5&
(with V
IN2
= 4.2V) with a strong dependence on input
supply voltage. The dropout voltage is simply the FET on-
resistance multiplied by the load current when in dropout.
OPERATIO
(Refer to Functional Diagram)
DUTY CYCLE (%)
0
10
20
30
40
50
60
70
80
90 100
3700 F02
110
100
90
80
70
60
50
40
30
20
10
I
RIPPLE
= 0.4I
PK
AT 5% DUTY CYCLE
I
RIPPLE
= 0.2I
PK
AT 5% DUTY CYCLE
V
IN
= 4.2V
Figure 2. Maximum Output Current vs Duty Cycle
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| LTC3700EMS#PBF | 功能描述:IC REG DL BUCK/LINEAR 10MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 + 切换式 系列:- 标准包装:2,500 系列:- 拓扑:降压（降压）同步（3），线性（LDO）（2） 功能:任何功能 输出数:5 频率 - 开关:300kHz 电压/电流 - 输出 1:控制器 电压/电流 - 输出 2:控制器 电压/电流 - 输出 3:控制器 带 LED 驱动器:无 带监控器:无 带序列发生器:是 电源电压:5.6 V ~ 24 V 工作温度:-40°C ~ 85°C 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* |
| LTC3700EMS#TR | 功能描述:IC REG DL BUCK/LINEAR 10MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 + 切换式 系列:- 标准包装:2,500 系列:- 拓扑:降压（降压）同步（3），线性（LDO）（2） 功能:任何功能 输出数:5 频率 - 开关:300kHz 电压/电流 - 输出 1:控制器 电压/电流 - 输出 2:控制器 电压/电流 - 输出 3:控制器 带 LED 驱动器:无 带监控器:无 带序列发生器:是 电源电压:5.6 V ~ 24 V 工作温度:-40°C ~ 85°C 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* |
| LTC3700EMS#TRPBF | 功能描述:IC REG DL BUCK/LINEAR 10MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 + 切换式 系列:- 标准包装:2,500 系列:- 拓扑:降压（降压）同步（3），线性（LDO）（2） 功能:任何功能 输出数:5 频率 - 开关:300kHz 电压/电流 - 输出 1:控制器 电压/电流 - 输出 2:控制器 电压/电流 - 输出 3:控制器 带 LED 驱动器:无 带监控器:无 带序列发生器:是 电源电压:5.6 V ~ 24 V 工作温度:-40°C ~ 85°C 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* |
| LTC3701EGN | 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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 ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3701EGN#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 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:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR |
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