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參數(shù)資料
| 型號(hào)： | MAX1564ETE |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | Triple 1.2A USB Switch in 4mm x 4mm Thin QFN |
| 中文描述： | 3-CHANNEL POWER SUPPLY SUPPORT CKT, QCC16 |
| 封裝： | 4 X 4 MM, TQFN-16 |
| 文件頁(yè)數(shù)： | 8/11頁(yè) |
| 文件大?。?/td> | 327K |
| 代理商： | MAX1564ETE |
M
Triple 1.2A USB Switch in 4mm x 4mm
Thin QFN
8
_______________________________________________________________________________________
current limiting. When V
OUT_
is greater than 1V, the
device operates in continuous current-limit mode and
limits output current to a user-programmable level.
When V
OUT_
is less than 1V, the device operates in
short-circuit current-limit mode and pulses the output
current to levels that are 30% (typ) higher than the
selected current limit. When either fault condition per-
sists for 20ms (typ), the output turns off and its fault flag
is asserted. The output automatically restarts 20ms
after the short or overload is removed.
Auto-Restart Mode
The MAX1564 detects short-circuit removal by sourcing
25mA from the output and monitoring the output volt-
age. When the voltage at the output exceeds 0.5V for
20ms, the fault flag resets, the output turns back on,
and the 25mA current source turns off. Active loads are
not expected to draw measurable current when sup-
plied with less than 0.5V. The MAX1564 can also be
reset from a fault by toggling the ON_ input for the
offending channel.
Reverse Current Blocking
The USB specification does not allow an output device
to source current back into the USB port. However, the
MAX1564 is designed to safely power noncompliant
devices. During normal operation with the channel
enabled, the IC immediately turns off the switch if the
output voltage rises above the input voltage sufficiently
to create a reverse current in excess of 0.9A (typ). If the
output voltage condition persists for longer than 20ms
(typ), the switch remains off and the
FLT_
flag is assert-
ed. When any channel is disabled, the output is
switched to a high-impedance state, blocking reverse
current flow from the output back to the input.
Thermal Shutdown
Independent thermal shutdown of each channel per-
mits delivering power to normal loads even if one load
has a fault condition. The thermal limit does not have
the 20ms fault blanking but sets the same fault latch
that is used for other faults. Exiting this latched state is
described in the
Auto-Restart Mode
section.
Fault Indicators and Fault Blanking
The MAX1564 provides an independent open-drain
fault output (
FLT_
) for each switch. Connect
FLT_
to IN_
through a 100k
pullup resistor for most applications.
FLT_
asserts low when any of the following conditions
occur:
The input voltage is below the UVLO threshold.
The switch junction temperature exceeds the +160°C
thermal-shutdown temperature limit.
The switch is in current-limit or short-circuit current-
limit mode after the fault-blanking period (20ms typ)
expires.
The reverse current condition exists after the fault-
blanking period expires.
The
FLT_
output goes high impedance after a 20ms
delay once the fault condition is removed. Ensure that
the MAX1564 input bypass capacitance prevents
glitches from triggering the
FLT_
outputs. To differenti-
ate large capacitive loads from short circuits or sus-
tained overloads, the MAX1564 has an independent
fault-blanking circuit for each switch. When a load tran-
sient causes the output to enter current limit, an internal
counter monitors the duration of the fault. For load
faults exceeding the 20ms fault-blanking time, the
switch turns off,
FLT_
asserts low, and the output enters
auto-restart mode (see the
Current-Limit Fault
Protection
and
Auto-Restart Mode
sections). Only cur-
rent-limit and short-circuit faults are blanked. Thermal-
overload faults and input voltages below the UVLO
threshold immediately turn off the offending output and
assert
FLT_
low.
Fault blanking allows the MAX1564 to handle USB
loads that might not be fully compliant with USB
specifications. The MAX1564 successfully powers USB
MAX1564
INA
1
3
4
2
5
16
15
14
6
11
9
10
12
8
7
13
INB
INC
VCC
SEL
OUTA
OUTB
OUTC
ONA
ONB
ONC
FLTA
FLTB
FLTC
R2
100k
R3
100k
R1
26.1k
R4
100k
C2
1
μ
F
C1
0.1
μ
F
C3
1
μ
F
C4
1
μ
F
SETI
INPUT
2.75V TO 5.5V
USB
PORT A
USB
PORT B
USB
PORT C
GND
ACTIVE-HIGH/
ACTIVE-LOW
SELECT INPUT
Figure 1. Typical Application Circuit
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1564ETE+ | 功能描述:電源開(kāi)關(guān) IC - USB Triple 1.2A USB Switch RoHS:否 制造商:Micrel 電源電壓-最小:2.7 V 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-8 封裝:Tube |
| MAX1564ETE+T | 功能描述:電源開(kāi)關(guān) IC - USB Triple 1.2A USB Switch RoHS:否 制造商:Micrel 電源電壓-最小:2.7 V 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-8 封裝:Tube |
| MAX1564ETE-T | 功能描述:電源開(kāi)關(guān) IC - USB Triple 1.2A USB Switch RoHS:否 制造商:Micrel 電源電壓-最小:2.7 V 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-8 封裝:Tube |
| MAX1564ETJ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1564EVKIT | 功能描述:電源開(kāi)關(guān) IC - USB Evaluation Kit for MAX1564 RoHS:否 制造商:Micrel 電源電壓-最小:2.7 V 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-8 封裝:Tube |
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