AIC1521 Analog Intergrations Corporation, AIC1521 Datasheet - Page 7

• Manufacturer Part Number: AIC1521
• Description: Single High-Side Power Switch With Control Function
• Manufacturer: Analog Intergrations Corporation

n
n
l Current Limit
l Thermal Protection
l
l
When the chip temperature exceeds 1 10 C, the
thermal protection function works.
A 0.1uF to 1uF 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.
Supply Filtering
PIN DESCRIPTION
APPLICATION INFORMATIONS
MSOP8, SO8
PIN 1/4/6/8: NC:
PIN 2: CTL
PIN 3: IN-
PIN 4: GND-
PN 7: OUT- MOSFET switch output.
The current limit threshold is preset internally. It
protects the output MOSFET switches from
damage
conditions or excess inrush current often
encountered during hot plug-in. The
allows minimum 500mA continuous load current
per Channel.
due
- TTL compatible control input. It
Power supply input.
Chip power ground.
to
controls the power switch turn-
on/turn-off.
AIC1521-1 and active low for
AIC1521-0.
undesirable
Active
short
AIC1521
High
circuit
for
l
l
l
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.
Bulk capacitance provides the short-term transient
current needed during a hot-attachment event. With
a 33uF, 16V tantalum or 100uF, 10V electrolytic
capacitor mounted close to downstream connector
should provide transient drop protection.
The power circuitry of USB printed circuit boards
requires a customized layout to maximize thermal
dissipation and to minimize voltage drop and EMI.
Transient Droop Requirements
Short Circuit Transient
Printed Circuit Layout
SOT89-5
PIN 1: IN
PIN 2: GND
PIN 3: OUT
PIN 4: NC
PIN 5: CTL
- Power supply input.
- Chip power ground.
- MOSFET switch output.
- TTL compatible control input. It
controls the power switch turn-
on/turn-off.
AIC1521-1 and active low for
AIC1521-0.
Active
AIC1521
High
for
7