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參數(shù)資料
| 型號： | MAX3355EEUD |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | +/-15kV ESD-Protected USB On-the-Go Charge Pump and Comparators in UCSP |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO14 |
| 封裝： | 4.40 MM, TSSOP-14 |
| 文件頁數(shù)： | 7/11頁 |
| 文件大?。?/td> | 228K |
| 代理商： | MAX3355EEUD |
Detailed Description
USB OTG is an emerging USB standard that enables
devices to talk in a peer-to-peer manner on a USB bus.
OTG allows peripherals and mobile devices such as
PDAs, cellular phones, and digital cameras to be
attached directly to one another without requiring a
PC host.
The MAX3355E integrates a charge pump and compara-
tors to enable a system with an integrated USB OTG
dual-role transceiver to function as a USB OTG dual-role
device. The MAX3355E
’
s internal charge pump supplies
V
BUS
power and signaling as defined in
On-the-Go
Supplement: USB 2.0, Revision 1.0
. The MAX3355E
’
s
internal level-detection comparators monitor important
V
BUS
voltages needed to support SRP and HNP.
Charge Pump
The MAX3355E provides power for the V
BUS
line using
an internal charge pump. The charge pump provides
an OTG-compliant output on V
BUS
while sourcing 8mA
load current. The charge pump can be powered from
voltages between +2.6V and +5.5V. A 0.1μF flying
capacitor, connected between C+ and C-, and a 1μF
(min) decoupling reservoir capacitor on V
BUS
are
required for proper operation.
The charge pump is active if
OFFVBUS
is connected to
V
L
and the MAX3355E is configured as device A (ID_IN
connected to GND). To minimize V
BUS
ripple, select a
reservoir capacitor value between 1μF and 6.8μF. The
charge-pump output is protected from short-circuit con-
ditions on V
BUS
by an internal current clamp that limits
the V
BUS
current to 200mA.
Current Generator
An internal current generator injects up to 600μA of cur-
rent onto the V
BUS
line. The current generator is stable
over the supply voltage variation. The current generator
is connected to V
BUS
when
OFFVBUS
and
SHDN
are 1
and ID_IN is open. It remains connected for t
VBUSCHRG
or until the V
BUS
line voltage exceeds the lower of V
CC
and 4.82V.
Comparators
The MAX3355E contains internal comparators for moni-
toring the V
BUS
voltage. The status of V
BUS
is summa-
rized in two status outputs: STATUS1 and STATUS2.
The status outputs can be used to negotiate for the
USB OTG bus. The V
BUS
status is conveyed according
to Table 1. While in shutdown mode, the STATUS2 out-
put can be used to indicate V
BUS
voltage (Table 2).
Device ID
Configure the MAX3355E as device A by connecting
ID_IN to GND and as device B by leaving ID_IN open
(Table 3). ID_IN is level translated to V
L
and provided
as an output at ID_OUT. V
L
sets the logic output high
level. ID_IN is internally pulled up to V
CC
.
M
±15kV ESD-Protected USB On-the-Go
Charge Pump and Comparators in UCSP
_______________________________________________________________________________________
7
STATUS1
0
1
0
1
STATUS2
0
0
1
1
SIGNIFICANCE
V
BUS
< V
THSESEND
V
THSESEND
< V
BUS
< V
THSESVLD
V
THSESVLD
< V
BUS
< V
THVBUSVLD
V
BUS
> V
THVBUSVLD
Table 1. Status Bit Significance
STATUS1
0
0
STATUS2
1
0
SIGNIFICANCE
V
BUS
< V
TH,
SHDN
V
BUS
> V
TH,
SHDN
Table 2. Status Bit Shutdown
Functionality (
SHDN
= GND)
ID_IN
0
Open
ID_OUT
0
V
L
CONFIGURATION
Device A
Device B
Table 3. Device ID
SHDN
0
1
1
1
OFFVBUS
X
0
1
1
ID_IN
X
X
0
1
V
BUS
R
INVBUS
R
INVBUS
5V
CHARGE PUMP
Inactive
Inactive
Active
Inactive
COMPARATORS
Inactive
Active
Active
Active
R
INVBUS
(Note 5)
Table 4. Function Select
Note:
The 600μA current source is supplied for t
VBUSCHRG
(see the Current Generator section).
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| MAX3355EEUD+ | 功能描述:電荷泵 USB On-the-Go Charge Pump RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| MAX3355EEUD+T | 功能描述:電荷泵 USB On-the-Go Charge Pump RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| MAX3355EEUD-T | 功能描述:電荷泵 RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| MAX335C/D | 功能描述:模擬開關(guān) IC Serial Controlled 8-Channel SPST Switch RoHS:否 制造商:Texas Instruments 開關(guān)數(shù)量:2 開關(guān)配置:SPDT 開啟電阻（最大值）:0.1 Ohms 切換電壓（最大）: 開啟時間（最大值）: 關(guān)閉時間（最大值）: 工作電源電壓:2.7 V to 4.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-16 |
| MAX335CNG | 功能描述:模擬開關(guān) IC RoHS:否 制造商:Texas Instruments 開關(guān)數(shù)量:2 開關(guān)配置:SPDT 開啟電阻（最大值）:0.1 Ohms 切換電壓（最大）: 開啟時間（最大值）: 關(guān)閉時間（最大值）: 工作電源電壓:2.7 V to 4.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-16 |
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