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부품번호 | AIC1526 기능 |
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기능 | Dual USB High-Side Power Switch | ||
제조업체 | Analog Intergrations Corporation | ||
로고 | |||
전체 8 페이지수
AIC1526
Dual USB High-Side Power Switch
FEATURES
• 110mΩ (5V Input) High-Side MOSFET Switch.
500mA Continuous Load Current per Channel.
110µA Typical On-State Supply Current.
1µA Typical Off-State Supply Current.
Current-Limit / Short Circuit Protection.
Thermal Shutdown Protection under Overcurrent
Condition.
Undervoltage Lockout Ensures that Switch is off at
Start Up.
Output can be Forced Higher than Input (Off-
State).
Open-Drain Fault Flag.
Slow Turn ON and Fast Turn OFF.
Enable Active-High or Active-Low.
APPLICATIONS
USB Power Management.
Hot Plug-In Power Supplies.
Battery-Charger Circuit.
DESCRIPTION
The AIC1526 is a dual high-side power switch
for self-powered and bus-powered Universal
Serial Bus (USB) applications. One high-side
switch is a MOSFET with 110mΩ RDS(ON), which
meets USB voltage drop requirements for
maximum transmission wire length.
Multi-purpose open-drain fault flag output
indicates over-current limiting, thermal
shutdown, or undervoltage lockout for each
channel. Output current is typically limited to 1A,
well below the 5A safety requirement, and the
thermal shutdown function independently
controls each channel under overcurrent
condition.
Guaranteed minimum output rise time limits
inrush current during hot plug-in, minimizing
EMI and preventing the voltage at upstream port
from dropping excessively.
Analog Integrations Corporation 4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC
DS-1526-00
TEL: 886-3-5772500 FAX: 886-3-5772510
www.analog.com.tw
1
AIC1526
BLOCK DIAGRAM
FLGA
CTLA
CTLB
FLGB
CHARGE PUMP
THERMAL
SHUTDOWN
CHARGE PUMP
OUTA
DRIVER
CURRENT
LIMIT
CS
UVLO
CURRENT
LIMIT
CS
DRIVER
IN
OUTB
TYPICAL PERFORMANCE CHARACTERISTICS
ON Resistance vs. Supply Voltage
118
116
Output On Resistance vs. Temperature
150
140
114
112
110
108
106
104
3.0
RL=47Ω
T=25°C
3.5 4.0 4.5 5.0
Supply Voltage (V)
5.5
130
120
110
100
90
80 -40
-20
RL=47Ω
T=25°C
0 20 40 60
Temperature (°C)
80
100
4
4페이지 AIC1526
APPLICATION INFORMATION
Error Flag
An open-drained output of an N-channel
MOSFET, the FLG output is pulled low to signal
the following fault conditions: input undervoltage,
output current limit, and thermal shutdown.
Current Limit
The current limit threshold is preset internally. It
protects the output MOSFET switches from
damage due to undesirable short circuit
conditions or excess inrush current often
encountered during hot plug-in. The low limit of
the current limit threshold of the AIC1526 allows
a minimum current of 0.5A through the MOSFET
switches. A current limit condition will signal the
error flag.
Thermal Shutdown
When the chip temperature exceeds 135°C for
any reason other than overcurrent fault of either
one of the two MOSFET switches, the thermal
shutdown function turns off both MOSFET
switches and signal the error flag. A hysteresis of
10°C prevents the MOSFETs from turning back
on until the chip temperature drops to below
125°C. However, if thermal shutdown is triggered
by chip temperature rise due to overcurrent fault
condition of either one of the MOSFET switches,
the thermal shutdown function will only turn off
the switch that is in overcurrent condition and the
other switch can still remain its normal operation.
In other words, the thermal shutdown function of
the two switches is independent of each other in
the case of overcurrent fault.
Supply Filtering
A 0.1µF to 1µF bypass capacitor from IN to GND,
located near the device, is strongly
recommended to control supply transients.
Without a bypass capacitor, an output short may
cause sufficient ringing on the input (from supply
lead inductance) to damage internal control
circuitry.
Transient Droop Requirements
USB support dynamic attachment (hot plug-in) of
peripherals. A current surge is caused by the
input capacitance of downstream device. Ferrite
beads are recommended in series with all power
and ground connector pins. Ferrite beads reduce
EMI and limit the inrush current during hot-
attachment by filtering high-frequency signals.
Short Circuit Transient
Bulk capacitance provides the short-term
transient current needed during a hot-attachment
event. With a 33µF, 16V tantalum or 100µF, 10V
electrolytic capacitor mounted close to
downstream connector per port should provide
transient drop protection.
Printed Circuit Layout
The power circuitry of USB printed circuit boards
requires a customized layout to maximize
thermal dissipation and to minimize voltage drop
and EMI.
7
7페이지 | |||
구 성 | 총 8 페이지수 | ||
다운로드 | [ AIC1526.PDF 데이터시트 ] |
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부품번호 | 상세설명 및 기능 | 제조사 |
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DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |