G551 Datasheet, PDF (1/1 Pages) Global Mixed-mode Technology Inc – Current-Limit Switches

Global Mixed-mode Technology Inc.
G551/G552
Current-Limit Switches
Features
„ 700mΩ On-Resistance
„ 2 Versions of Current Limits, 85mA (G551B1/ B2 &
G552B1/B2) and 170mA (G551A1/A2 & G552A1/ A2)
„ 2V to 5.5V Supply Range
„ Undervoltage Lockout
„ 85μA Supply Current
„ 1μA Maximum Shutdown Current
„ Auto-Restart Function (G551A1/B1 & G552A1/B1)
or Latch-off Function (G551A2/B2 & G552A2/B2)
„ Active High Enable (G551) or Active Low Enable
(G552)
„ Thermal-Shutdown Protection
„ Reverse-Current Limit Protection
„ 40ms Blanking Time
„ 280ms Auto-Restart Time (G551A1/B1 & G552A1/B1)
„ Fault FLAG Function
„ Fast Current-Limit Response Time
„ SC-70-5( SOT-353) Package
Applications
„ PDAs
„ Cell Phones
„ GPS Systems
„ Hand-Held Devices
General Description
The G551/G552 family of switches feature internal cur-
rent limiting to prevent host devices from being dam-
aged due to faulty load conditions. These analog
switches have a low 0.7Ω on-resistance and operate
from a 2.0V to 5.5V input voltage range. They are
available with guaranteed 50mA and 100mA current
limits, making them ideal for load-switching applica-
tions.
When the switch is on and a load is connected to the
port, a typical blanking time of 40ms ensures that the
transient voltages settle down. If after this blanking
time the load current is greater than the current limit,
the G551A2/B2 & G552A2/B2 enter a latch-off state
where the switch is turned off and FLAG is issued to
the microprocessor. The switch can be turned on again
by cycling the power or the ON pin.
The G551A1/B1 & G552A1/B1 have an auto-restart
feature where the switch turns off after the blanking
time and then continuously checks to see if the over-
load condition is present. The switch remains on after
the overload condition disappears. The ON pin of
G551 series are active high, while G552 series are
active low.
Pin Configuration
Typical Application Circuit
VOUT 1
G551/G552
5 VIN
GND ²
FLAG ³
4 ON
(ON)
SC-70-5 (SOT-353)
() is for G552
G551/G552
V_IN
VIN
OUT
V_OUT
FLAG
FLAG
ON
(ON)
GND
ON
OFF
Ver: 1.3
Aug 24, 2009
TEL: [phone]
http://www.gmt.com.tw
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