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参数资料
| 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： | 3/16页 |
| 文件大小： | 85K |
| 代理商： | LTC3808EGN |
1998 Mar 24
11
Philips Semiconductors
Preliminary specication
High efciency DC/DC converter
TEA1205AT
APPLICATION INFORMATION
Fig.8 Complete application for upconversion.
handbook, full pagewidth
MGM701
C1
L1
C2
D1
SENSE
OUT
VO
TEA1205AT
LX
GND
VSEL SYNC SHDWN
VI
ILIM
Rlim
A typical component choice for an upconverter from
3 NiCd cells or one Li-ion cell to 5.0 V in a GSM handset
(peak power 7.5 W, peak current 2.7 A) is (see Fig.8):
L1 = 10 H; Isat > 2.3 A; low DC resistance, e.g.
Coilcraft DO3308-103
C1 = 100 F; low ESR capacitor; necessity depends on
type of input voltage source
C2 = 330 F; ESR = 0.1 ; e.g. Sprague 595D series
D1; medium power Schottky diode; e.g. Philips
PRLL5819.
For lower power applications, the Isat and RDC values of
the inductor can be scaled back by the scaling factor of the
output current from the values above. The same holds for
the ESR value of the output capacitor. A further
improvement is increase of inductance and decrease of
output capacitance.
An additional circuit to prevent start-up deadlock in
upconversion is shown in Fig.9. The function of TR1, R1
and R2 is to put the converter into shut-down mode when
the input source is suddenly disconnected. The circuit
operates as follows. When VI is present, TR1 conducts
and the SHDWN pin is kept LOW. As soon as VI falls below
1 V, TR1 no longer conducts and the device is put into
shut-down before VO falls below 2 V. In the event that a
signal is available which indicates the presence of the
input voltage source, this signal should be applied to the
SHDWN pin. TR1, R1 and R2 should be omitted in that
case.
More application information can be found in the
associated application note.
Fig.9 External deadlock prevention circuit.
handbook, halfpage
MGK930
SHDWN
TR1
R1
1 M
R2
2.7 M
VO
VI
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相关代理商/技术参数 |
参数描述 |
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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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