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| 型号： | LTC3808EGN |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, PDSO8 |
| 封装： | PLASTIC, MS-012-AA, SOT-96-1, SO-8 |
| 文件页数： | 13/16页 |
| 文件大小： | 85K |
| 代理商： | LTC3808EGN |
1998 Mar 24
6
Philips Semiconductors
Preliminary specication
High efciency DC/DC converter
TEA1205AT
Synchronisation function
In continuous conduction mode, the converter
switching frequency is synchronized to the signal at the
SYNC input, provided that this signal is present and its
frequency is 13 MHz. The switching frequency will than
be 26 times smaller than the applied input frequency at
the sync pin. If no sync signal is applied (Sync pin H
or L), the converter’s switching frequency will be
around 203 kHz, equally to behaviour at 13 MHz sync
input frequency, but with a larger tolerance. When this
function is not used, the SYNC pin must be tied to pin 3
or pin 6.
Power switches
The power switches in the IC are one N-type and one
P-type MOSFET, having a typical pin-to-pin resistance of
0.12
and 0.16 respectively. The maximum average
current in the switches is 1.0 A.
Temperature protection
At too high device temperature (typical 165
°C), the
converter stops operating. It resumes operation when the
device temperature falls below 165
°C again. As a result,
low-frequent cycling between on and off state will occur.
It should be noted that in the event of device temperatures
around the cut-off limit, the application differs strongly from
maximum specifications.
Current limit
If the current in the N-type power switch exceeds the limit
which is set by the value of the external resistor, current
ramping is stopped immediately, and the next switching
phase is entered. Current limitation is required to enable
optimal use of energy in Li-ion batteries, and to keep
power conversion efficient during temporary high loads.
Furthermore, current limitation protects the IC against
overload conditions, inductor saturation, etc.
Behaviour at input voltage exceeding the specied
range
In general, an input voltage exceeding the specified range
is not recommended since instability may occur. However,
at an input voltage equal to or higher than the target output
voltage plus the diode voltage drop, but lower than 6 V, the
converter will stop switching and the external schottky
diode will take over, resulting in Vo equalling Vi minus the
diode voltage drop (see Fig.8).
Fig.3
Coil current waveforms in the various power
modes.
handbook, halfpage
time
low power
mode
medium power
mode 1
medium power
mode 2
low DC current
high DC current
increasing
load
MGK924
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| LTC3808EGN#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:- 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) |
| LTC3808EGN#TRPBF | 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:- 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) |
| LTC3809EDD | 功能描述:IC REG CTRLR BUCK PWM CM 10-DFN RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 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) |
| LTC3809EDD#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 10-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 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 |
| LTC3809EDD#TR | 功能描述:IC REG CTRLR BUCK PWM CM 10-DFN RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 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) |
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