參數(shù)資料
型號(hào)： RT9702A
英文描述： Power Management/Switchers
中文描述： 電源管理/切換器
文件頁(yè)數(shù)： 14/16頁(yè)
文件大?。?/td> 240K
代理商： RT9702A
RT9702/A
Preliminary
www.richtek.com
14
DS9702A-01 March 2003
If the voltage drop across the PCB is limited to 100mV,
the maximum resistance for the switch is 250m
for
four ports ganged together. The RT9702/A, with its
maximum 100m
on-resistance over temperature,
easily meets this requirement.
PCB Layout
In order to meet the voltage drop, droop, and EMI
requirements, careful PCB layout is necessary. The
following guidelines must be considered:
Keep all V
BUS
traces as short as possible and use at
least 50-mil, 2 ounce copper for all V
BUS
traces.
Avoid vias as much as possible. If vias are necessary,
make them as large as feasible.
Place a ground plane under all circuitry to lower both
resistance and inductance and improve DC and
transient performance (Use a separate ground and
power plans if possible).
Place cuts in the ground plane between ports to help
reduce the coupling of transients between ports.
Locate the output capacitor and ferrite beads as close
to the USB connectors as possible to lower
impedance (mainly inductance) between the port and
the
capacitor
and
improve
performance.
transient
load
Locate the RT9702/A as close as possible to the
output port to limit switching noise.
Locate the ceramic bypass capacitors as close as
possible to the V
IN
pins of the RT9702/A.
ESD
Because USB is a hot insertion and removal system,
USB components (especially the connector pins) are
subject to electrostatic
discharge (ESD) and should be
qualified to IEC801.2. The RT9702/A is designed to
withstand a 8kV human body mode, as defined in
MIL-STD-883C. The requirements in IEC801.2 are
much more stringent and require additional capacitors
for the RT9702/A to withstand the higher ESD energy.
Low-ESR 1
μ
F ceramic bypass capacitors and output
capacitors should be placed as closely as possible to
the V
IN
and V
OUT
pins to increase the ESD immunity.
The RT9702/A may pass the requirements of IEC
1000-4-2 (EN 50082-1) level-4 for 15kV air discharge
and 8kV contact discharge tests when these capacitors
are added.
GND
V
OUT
CE
VI
N
FLG
V
BUS
GND_
BUS
USB Controller
Board Layout
相關(guān)PDF資料
PDF描述
RT9801A Power Management/Voltage Dector
RT9801B Power Management/Voltage Dector
RT9802A Power Management/Voltage Dector
RT9802B Power Management/Voltage Dector
RTAF0000 MONTAGE CLIP
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
RT9702AGB 功能描述:IC PWR SW USB 1.5A SOT23-5 RoHS:是 類別:集成電路 (IC) >> PMIC - 電源分配開關(guān) 系列:- 特色產(chǎn)品:XRP252 Switches 標(biāo)準(zhǔn)包裝:1 系列:- 類型:高端開關(guān) 輸出數(shù):2 Rds（開）:140 毫歐 內(nèi)部開關(guān):是 電流限制:1.15A 輸入電壓:1.75 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:10-TDFN（3x3） 包裝:Digi-Reel® 其它名稱:1016-1691-6
RT9702AGJ5 功能描述:IC PWR SW USB 1.1A TSOT-23-5 RoHS:是 類別:集成電路 (IC) >> PMIC - 電源分配開關(guān) 系列:- 特色產(chǎn)品:XRP252 Switches 標(biāo)準(zhǔn)包裝:1 系列:- 類型:高端開關(guān) 輸出數(shù):2 Rds（開）:140 毫歐 內(nèi)部開關(guān):是 電流限制:1.15A 輸入電壓:1.75 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:10-TDFN（3x3） 包裝:Digi-Reel® 其它名稱:1016-1691-6
RT9702APB 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:80mヘ, 500mA/1.1A High-Side Power Switches with Flag
RT9702APJ5 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:80mヘ, 500mA/1.1A High-Side Power Switches with Flag
RT9702GB 功能描述:IC PWR SW USB 1.1A SOT23-5 RoHS:是 類別:集成電路 (IC) >> PMIC - 電源分配開關(guān) 系列:- 特色產(chǎn)品:XRP252 Switches 標(biāo)準(zhǔn)包裝:1 系列:- 類型:高端開關(guān) 輸出數(shù):2 Rds（開）:140 毫歐 內(nèi)部開關(guān):是 電流限制:1.15A 輸入電壓:1.75 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:10-TDFN（3x3） 包裝:Digi-Reel® 其它名稱:1016-1691-6
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