MC33888FB Freescale, MC33888FB Datasheet - Page 17

• Manufacturer Part Number: MC33888FB
• Manufacturer: Freescale

Specifications of MC33888FB

• Switch Type: High Side
• Power Switch Family: MC33888FB
• Input Voltage: 6 to 27V
• Power Switch On Resistance: 100mOhm
• Output Current: 10A
• Number Of Outputs: 4
• Mounting: Surface Mount
• Supply Current: 20mA
• Package Type: PQFP
• Operating Temperature (min): -40C
• Operating Temperature (max): 150C
• Operating Temperature Classification: Automotive
• Pin Count: 64
• Lead Free Status / RoHS Status: Compliant

Freescale Semiconductor, Inc.
MC33888FB
can be cleared on a rising edge of CSB. If the fault remains, the retried output will latch off after the fault timer expires and the
fault bit will remain set in the status register.
For the LS output of interest, if a D4-D11 bit was set to a logic L in the OLCR register, the output experiencing an over-current
condition is not disabled until an over-temperature fault threshold has been reached. The specific output goes into an analog
current limit mode of operation ILIM . The QHSOLSS uses over-temperature shutdown to protect all outputs in this mode of
operation. If the over-current condition is removed before the output has reached its over-temperature limit, the output will
function as if no fault has occurred.
Note that each pair of Low Side Drivers, LS4-5, LS6-7, LS8-9, and LS10 –11 consist of a 500mA and 800mA output. As shown
in the device pinout, each of these pairs of outputs share ground bondwires. The bondwires are not rated to handle both outputs
in current limit mode simultaneously.
OVER-CURRENT FAULT REQUIREMENTS: HS OUTPUT
For the HS output of interest, the output current is limited to one of four levels depending upon : the type of HS output, the
amount of time that has elapsed since the output was switched on, and the state of the CLOCCR register. Assuming that bits
D0-D3 of the CLOCCR register are at logic L, the current limit levels of the outputs will be initially at their peak levels as specified
by the HSxxilimpk. After the HS output is switched on, the peak current timer will start. After a period of time Tpct, the current
limit level will change to the sustain levels HSxxilimsus.
For the HS output of interest, if a D0-D3 bit of the CLOCCR is at logic H, then the assigned output will only current limit at the
sustain level specified by HSxxilimsus.
Current is limited until the over temperature circuitry shuts OFF the device. The device will turn ON automatically when the
temperature fails below the TLIM(hyst). This cycle continues indefinitely until action is taken by the master to shut the output(s)
OFF.
REVERSE BATTERY REQUIREMENTS
The LS and HS outputs survive the application of reverse battery as low as –16V.
GROUND DISCONNECT PROTECTION
In the event that the QHSOLSS ground is disconnected from load ground, the device protects itself and safely turns off the
outputs, regardless of the state of the output at the time of disconnection.
BATTERY DISCONNECT PROTECTION
In the event that the QHSOLSS is disconnected from Vpwr, the device protects itself and safely turn off the outputs, regard-
less of the state of the output at the time of disconnection.
UNDER-VOLTAGE SHUTDOWN REQUIREMENTS
All outputs turn off at some battery voltage below 6.0V, however, as long as the level stays above 5.0V, the internal logic states
within the device are designed to be sustained. This ensures that when the battery level then rises above 6.0V, the device will
return to the state that it was in prior to the excursion between 5.0V and 6.0V (assuming that there was no SPI communication
or direct input changes during the event). If the battery voltage falls to a level below 5.0V, then the internal logic is reinitialized
and the device is then in the Default state upon the return of levels in excess of 6.0V.
OUTPUT VOLTAGE CLAMPING
Each output has an internal clamp to provide protection and dissipate the energy stored in inductive loads. Each clamp
independently limits the drain to source voltage to the range specified in the table “Power output characteristics”.
For More Information On This Product,
Go to: www.freescale.com
Quad High Side and Octal Low Side Switch for Automotive
17