ST2052BDR ,CURRENT LIMITED POWER DISTRIBUTION SWITCHESST2052CURRENT LIMITEDPOWER DISTRIBUTION SWITCHESPRELIMINARY DATA■ 80mΩ HIGH-SIDE MOSFET SWITCH■ 500 ..
ST2054BD ,CURRENT LIMITED POWER DISTRIBUTION SWITCHESST2054CURRENT LIMITEDPOWER DISTRIBUTION SWITCHES
ST2052BDR
CURRENT LIMITED POWER DISTRIBUTION SWITCHES
1/8November 2003 80mΩ HIGH-SIDE MOSFET SWITCH 500mA CONTINUOUS CURRENT PER
CHANNEL INDEPENDENT THERMAL AND
SHORT-CIRCUIT PROTECTION WITH
OVERCURRENT LOGIC OUTPUT OPERATING RANGE FROM 2.7V TO 5.5V CMOS- AND TTL-COMPATIBLE ENABLE
INPUTS 2.5ms TYPICAL RISE TIME UNDERVOLTAGE LOCKOUT 10μA MAXIMUM STANDBY SUPPLY
CURRENT AMBIENT TEMPERATURE RANGE, 0°C TO
85°C ESD PROTECTION
DESCRIPTIONThe ST2052 power distribution switches is
intended for application where heavy capacitive
loads and short circuits are likely to be
encountered. These devices incorporate 80mΩ
N-channel MOSFET high-side power switches for
power-distribution systems that require multiple
powers switchesina single package. Each switch controlledbyan independent logic enable input.
Gate driveis providedbyan internal charge pump
designedto control the power-switch rise times
and fall timesto minimize current surges during
switching. The charge pump requires no external
components and allows operation from supplies lowas 2.7V.
When the output load exceeds the current-limit
thresholdora shortis present, these devices limit
the output currenttoa safe levelby switching into constant-current mode, pulling the overcurrent
(OCx) logic output low. When continuous heavy
overloads and short circuits increase the power
dissipationin the switch, causing the junction
temperatureto rise,a thermal protection circuit
shutsoff the switchto prevent damage. Recovery
froma thermal shutdownis automatic once the
device has cooled sufficiently. Internal circuitry
ensures the switch remains off until valid input
voltage is present. These power-distribution
switches are designedto current limitat 0.9A
ORDERING CODES
ST2052CURRENT LIMITED
POWER DISTRIBUTION SWITCHES
PRELIMINARY DATA
ST20522/8
PIN CONFIGURATION PIN DESCRIPTION
ABSOLUTE MAXIMUM RATINGSAbsoluteMaximum Ratingsare those values beyond which damagetothe device may occur. Functional operation under these conditionis
not implied.
Note1:All voltageare referredto GND
RECOMMENDED OPERATING CONDITION
ST20523/8
BLOCK DIAGRAM
POWER SWITCH ELECTRICAL CHARACTERISTICS(VI =5.5V,IO= rated current, VIEN =VI,TJ =25°C,
unless otherwise specified.) (See Note1)
ST20524/8
ENABLE INPUT ENx CHARACTERISTICS(VI =5.5V,IO= rated current,VIEN =VI,TJ= 25°C, unless
otherwise specified.) (See Note1)
CURRENT LIMIT CHARACTERISTICS (VI =5.5V,IO= rated current, VIEN =VI,TJ= 25°C, unless
otherwise specified.) (See Note1)
SUPPLY CURRENT CHARACTERISTICS (VI =5.5V,IO= rated current, VIEN =VI,TJ= 25°C, unless
otherwise specified.) (See Note1)
UNDERVOLTAGE CHARACTERISTICS(VI =5.5V,IO= rated current,VIEN =VI,TJ= 25°C, unless
otherwise specified.) (See Note1)
OVERCURRENT (OC) CARACTERISTICS (VI =5.5V,IO= rated current, VIEN =VI,TJ= 25°C, unless
otherwise specified.) (See Note1)
Note1: Pulse testing techniques maintain junction temperature closeto ambient temperature: thermal effect mustbe takesinto account
separately.
Note2: Specifiedby design,not production tested.
ST20525/8
TEST CIRCUIT
WAVEFORM: PROPAGATION DELAYS (f=1MHz; 50% duty cycle)
