AIC1529 查看數據表（PDF） - Analog Intergrations

零件编号

产品描述 (功能)

生产厂家

AIC1529

Quad USB High-Side Power Switch

Analog Intergrations 

PIN DESCRIPTIONS

OUTA (B,C,D) -Channel A (B,C,D) MOSFET

switch output.

GND -

Chip power return, Connect both

pins to ground.

IN(A/B, C/D) - Channel A and B (C and D)

power supply input.

CTLA (B,C,D)- Controls the turn-on/turn-off of

channel A (B,C,D) MOSFET

with TTL as a control input.

Active high for AIC1529-1 and

active low for AIC1529-0.

APPLICATION INFORMATION

Error Flag

An error Flag is an open-drained output of an

N-channel MOSFET. 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 resulting from undesirable short circuit

conditions or excess inrush current, which is often

encountered during hot plug-in. The low limit of

the current limit threshold of the AIC1529 allows a

minimum current of 1A through the MOSFET

switches. The error flag signals when any current

limit conditions occur.

Thermal Shutdown

When temperature of AIC1529 exceeds 135°C

for any reasons, the thermal shutdown function

turns both MOSFET switches off and signals the

error flag. A hysteresis of 10°C prevents the

MOSFETs from turning back on until the chip

temperature drops below 125°C. However, if

thermal shutdown is triggered by chip

temperature rise resulting from overcurrent fault

AIC1529

FLGA (B,C,D)- An active-low and open-drained

fault flag output for channel A

(B,C,D). FLGA (B,C,D) is an

indicator for current limit when

CTLA (B,C,D) is active. In

normal mode operation

(CTLA(C) or/and CLTB(D) is

active), it also can indicate

thermal

shutdown

or

undervoltage.

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 Requirements

USB supports 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.

8

Share Link: