MIC204 MICREL [Micrel Semiconductor], MIC204 Datasheet - Page 3

• Manufacturer Part Number: MIC204
• Description: SINGLE CHANNEL HIGH CURRENT LOW VOLTAGE, PROTECTED POWER DISTRIBUTION SWITCH
• Manufacturer: MICREL [Micrel Semiconductor]

Pin Description
October 2003
MIC2044/2045
Pin Number
7,11,13,16
9,12,14
10
15
1
2
3
4
6
5
8
Pin Name
PWRGD
UVLOIN
/FAULT
PGREF
VBIAS
SLEW
VOUT
GND
ILIM
VIN
EN
Pin Function
Power-Good (Output): Open drain N-Channel device, active high. This pin
asserts high when the voltage at PGREF exceeds its threshold.
Switch Enable (Input): Gate control pin of the output MOSFET available as
an active high (–1) or active low (–2) input signal.
Fault Status (Output): Open drain N-Channel device, active low. This pin
indicates an overcurrent or thermal shutdown condition. For an overcurrent
event, /FAULT is asserted if the duration of the overcurrent condition lasts
longer than 32ms.
Ground connection: Tie to analog ground.
Slew-Rate Control (Input): A capacitor connected between this pin and
ground will reduce (slow) the output slew-rate. The output turn-on time must
be less than the nominal flag delay of 32ms in order to avoid nuisance
tripping of the /FAULT output since V
200mV of the voltage at the input) before the /FAULT signal delay elapses.
The slew-rate limiting capacitor requires a 16V rating or greater, 25V is
recommended. See
ment”
Current Limit (Input): A resistor (R
sets the current limit threshold as I
factor specified in the
the continuous output current range is 1A to 6A.
Undervoltage Lockout Adjust (Input): With this pin left open, the UVLO
threshold is internally set to 1.45V. When the switching voltage (V
below 1.5V, connecting an external resistive divider to this input will lower the
UVLO threshold. The total resistance of the divider must be less than 200k .
To disable the UVLO, tie this pin to VIN. See
further detail.
Switch Supply (Input): Connected to the drain of the output MOSFET. The
range of input for the switch is 0.8V to 5.5V. These pins must be externally
connected together to achieve rated performance.
Switch (Output): Connected to the source of the output MOSFET. These
pins must be externally connected together to achieve rated performance.
Bias Supply (Input): This input pin supplies power to operate the switch and
internal circuitry. The input range for VBIAS is 1.6V to 5.5V. When switched
voltage (V
desired, connect VBIAS to VIN externally.
Power-Good Threshold (Input): Analog reference used to specify the
PWRGD threshold. When the voltage at this pin exceeds its threshold, V
PWRGD is asserted high. An external resistive divider network is used to
determine the output voltage level at which V
“Functional Description”
utilized, this input should be tied to VOUT.
for further details.
IN
3
) is between 1.6V to 5.5V and the use of a single supply is
“Applications Information: Output Slew-Rate Adjust-
“Electrical Characteristics”
for further detail. When the PWRGD signal is not
SET
LIMIT
OUT
) connected from this pin to ground
= CLF/R
must be “fully on” (i.e., within
“Applications Information”
TH
is exceeded. See the
SET
table. For the MIC2044/45,
. CLF is the current limit
MIC2044/2045
IN
) is at or
for
TH
Micrel
,