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UZXYY Folha de dados(PDF) 10 Page - Advanced Analogic Technologies

Nome de Peças UZXYY
Descrição Electrónicos  PCMCIA Current Limit Interface and Capacitor Charger
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Fabricante Electrônico  ANALOGICTECH [Advanced Analogic Technologies]
Página de início  http://www.analogictech.com
Logo ANALOGICTECH - Advanced Analogic Technologies

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AAT4620
PCMCIA Current Limit Interface
and Capacitor Charger
10
4620.2007.04.1.1
nal resistors connected between the two SET pins
and ground. The minimum current limit threshold is
specified by I
LIM(MIN). If the load condition maintains
the device in current limit and the chip temperature
reaches a critical point, then an internal power loop
will reduce the current to a safe level. Connecting
ISETU to ground disables the current limit protec-
tion allowing a low impedance path to the host V
CC.
The load switch is turned off by applying a logic
high level to both of the EN pins. When both EN IL
and EN IU are selected ISETU will be selected.
The EN function has logic level thresholds that
allow the AAT4620 to be TTL compatible and may
also be controlled by 2.5V to 5.0V CMOS circuits.
The voltage level applied to the EN pins should not
exceed the input supply level present on the VCC
pin. The AAT4620 typically consumes 40µA when
operating, when off, the device draws less then
1µA. In the off state, current is prevented from flow-
ing between the input and output.
Under-voltage lockout circuitry ensures that the
V
CC supply is high enough for correct operation of
the IC. Also included is a System Ready function
which will be activated when the capacitor voltage
is charged and the load is permitted to take current.
For automatic functionality, this pin can be directly
connected to the EN IU pin. An external resistor is
provided to add hysteresis to this function.
Application Information
ISETU and ISETL Current Limit Set
The AAT4620 current limit is set at two different lev-
els. Resistors from ISETL and ISETU set the lower
and upper current limit levels respectively.
The ISETL and ISETU nodes operate within a win-
dow of 0.75V to 1.5V for resistor values ranging from
93.75
Ω to 1.5MΩ. Resistor values outside this range
are not recommended. The ISETL and ISETU
source current varies with the resistor value used
according to Table 1. To determine the resulting cur-
rent limit multiply the R
SETU or RSETL node voltage
times the gain in Table 1. Note that the voltage at the
node varies from 0.75V to 1.5V and the current limit
gain varies depending on the resistor value used.
If the set pin is open circuit or allowed to exceed
2V, all power devices are disabled and the input is
disconnected from the output. Shorting the set pin
to GND enables all power devices and shorts the
V
CC to the output pin with no current limit.
To activate the upper current level (R
SETU) pull EN IU
low. To activate the lower current level (R
SETL) pull
EN IL low. If both EN IU and EN IL are pulled low the
EN IU current limit level (R
SETU) will be selected.
V
ISET = RSET · IISET = 0.75V to 1.5V
Table 1: R
SET Table.
R
SET Range
I
ISET (µA)
I
LIM/VISET (A/V)
Current Limit Range (A)
Current Limit
1.5Meg - 750k
1
0.8
1.2-0.6
R
SET*1µA*0.8
750k - 375k
2
0.4
0.6-0.3
R
SET*2µA*0.4
375k - 187.5k
4
0.2
0.3-0.15
R
SET*4µA*0.2
187.5 - 93.75k
8
0.1
0.15-0.075
R
SET*8µA*0.1


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