參數(shù)資料
型號(hào): LTC3808EGN
廠商: NXP SEMICONDUCTORS
元件分類: 穩(wěn)壓器
英文描述: SWITCHING CONTROLLER, PDSO8
封裝: PLASTIC, MS-012-AA, SOT-96-1, SO-8
文件頁數(shù): 3/16頁
文件大?。?/td> 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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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC3808EGN#PBF 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR)
LTC3808EGN#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR)
LTC3809EDD 功能描述:IC REG CTRLR BUCK PWM CM 10-DFN RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR)
LTC3809EDD#PBF 功能描述:IC REG CTRLR BUCK PWM CM 10-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 特色產(chǎn)品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 標(biāo)準(zhǔn)包裝:1 系列:PowerWise® PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:81% 電源電壓:4.5 V ~ 18 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-5°C ~ 125°C 封裝/外殼:32-WFQFN 裸露焊盤 包裝:Digi-Reel® 產(chǎn)品目錄頁面:1303 (CN2011-ZH PDF) 其它名稱:LM3754SQDKR
LTC3809EDD#TR 功能描述:IC REG CTRLR BUCK PWM CM 10-DFN RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR)