參數(shù)資料
型號: LTC3808
廠商: Linear Technology Corporation
英文描述: 16-Bit Bus Transceiver With 3-State Outputs 48-TVSOP -40 to 85
中文描述: 無檢測電阻低EMI,同步DC / DC控制器的輸出跟蹤
文件頁數(shù): 23/28頁
文件大?。?/td> 372K
代理商: LTC3808
23
LTC3808
3808f
APPLICATIU
The N-channel MOSFET in Si7540DP has 0.017
R
DS(ON)
.
The short circuit current is:
W
U
U
I
mV
A
SC
=
=
90
0 017
.
5 3
.
So the inductor current rating should be higher than 5.3A.
The PLLLPF pin will be left floating, so the LTC3808 will
operate at its default frequency of 550kHz. For continuous
Burst Mode operation with 600mA I
RIPPLE
, the required
minimum inductor value is:
L
V
600
kHz
mA
V
V
H
MIN
=
=
μ
1 8
.
550
1
1 8
2 75
.
1 88
.
.
A 6A 2.2
μ
H inductor works well for this application.
C
IN
will require an RMS current rating of at least 1A at
temperature. A C
OUT
with 0.1 ESR will cause approxi-
mately 60mV output ripple. In most applications, the
requirements for these capacitors are fairly similar.
PC Board Layout Checklist
When laying out the printed circuit board, use the follow-
ing checklist to ensure proper operation of the LTC3808.
The power loop (input capacitor, MOSFET, inductor,
output capacitor) should be as small as possible and
isolated as much as possible from LTC3808.
Put the feedback resistors close to the V
FB
pins. The I
TH
compensation components should also be very close to
the LTC3808.
The current sense traces (SENSE
+
and SENSE
) should
be Kelvin connections right at the P-channel MOSFET
source and drain.
Keeping the switch node (SW) and the gate driver nodes
(TG, BG) away from the small-signal components, espe-
cially the feedback resistors, and I
TH
compensation
components.
相關(guān)PDF資料
PDF描述
LTC3808EGN No RSENSE Low EMI, Synchronous DC/DC Controller with Output Tracking
LTC3736-1 No RSENSE Low EMI, Synchronous DC/DC Controller with Output Tracking
LTC3737 No RSENSE Low EMI, Synchronous DC/DC Controller with Output Tracking
LTC3737EGN Dual 2-Phase, No RSENSE DC/DC Controller with Output Tracking
LTC3737EUF Dual 2-Phase, No RSENSE DC/DC Controller with Output Tracking
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC3808EDE 制造商:Linear Technology 功能描述:DC DC Cntrlr Single-OUT Sync Step Down 2.75V to 9.8V Input 14-Pin DFN EP
LTC3808EDE#PBF 功能描述:IC REG CTRLR BUCK PWM CM 14-DFN 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)
LTC3808EDE#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 14-DFN 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#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)