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PDF AAT4620 Data sheet ( Hoja de datos )
| Número de pieza | AAT4620 | |
| Descripción | PCMCIA Current Limit Interface and Capacitor Charger | |
| Fabricantes | Skyworks | |
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DATA SHEET
AAT4620
PCMCIA Current Limit Interface and Capacitor Charger
General Description
The AAT4620 SmartSwitch is a current limited P-channel
MOSFET power switch designed for high-side load-
switching applications in PCMCIA GSM/GPRS/3G modem
cards. Used in conjunction with a super capacitor, the
AAT4620 will ensure that the power ratings of the PCMCIA
host are not exceeded at any time. Featuring two inde-
pendent, programmable current limits and a power loop,
the AAT4620 can ensure that the super capacitor can be
charged without exceeding PCMCIA specifications. The
current limit is set by two external resistors allowing a
±10% current limit accuracy over the normal operating
temperature range. The switch can be controlled from
either of the two enable inputs and in the off condition
will block currents in both directions. The AAT4620 also
incorporates a System READY function which can advise
the system that the super capacitor is fully charged and
ready for use. Adjustable hysteresis is provided with the
addition of an external resistor. The quiescent supply cur-
rent is typically a low 40μA. In shutdown mode, the sup-
ply current decreases to less than 1μA.
The AAT4620 is available in a thermally enhanced,
Pb-free, 12-pin TSOPJW package and is specified over
the -40°C to 85°C temperature range.
Features
• VIN Range: 3.0V to 5.5V
• Dual Independent Current Limits
▪ 100mA to 1200mA
▪ ±10% Current Accuracy
▪ 20°C Temperature Band
• Reverse Current Blocking Protection
• Power Loop
• Low Quiescent Current
▪ 40μA Typical
▪ 1.0μA Max with Switch Off
• 65m Typical RDS(ON) at 3V
• Only 1.4V Needed for Enable Control Pin
• System READY Output with Externally Programmable
Hysteresis
• Under-Voltage Lockout
• Temperature Range: -40°C to 85°C
• 12-Pin TSOPJW Package
Applications
• CF Card Port Power Protection
• Express Card GSM/GPRS/3G Modems
• Hot Swap Supplies
• PCMCIA Card GSM/GPRS/3G Modems
• Personal Communication Devices
Typical Application
VCC
ENSUPERCAP
ENOPERATION
VCC
EN IL
Under-
Voltage
Lockout
Reverse
Blocking
Over-Temp
Protection
Power
Loop
EN IU
1.2V
Reference
GND
Current
Limit
Control
RHYS
OUT
RDY
100kΩ
To Load
To μC
ISETL
ISETU
RSETU
RSETL
SuperCap
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201943A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 15, 2012
1
1 page  
DATA SHEET
AAT4620
PCMCIA Current Limit Interface and Capacitor Charger
Typical Characteristics
Output Current vs. Output Voltage
(RSETU = 383kΩ, 25°C)
0.40
VIN = 3.3V
0.30
0.20
0.10 VIN = 5V
0.00
0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3 3.3
Output Voltage (V)
1.40
1.20
1.00
0.80
0.60
0.40
0.20
0.00
0
RSET vs. ILIM
(25°C)
VIN = 3.3V
VIN = 5V
200 400 600 800 1000 1200 1400 1600
RSET (kΩ)
Reverse Off-Switch Current vs. Temperature
(ENUB = ENLB = VCC; VIN = 0V)
100
10
VOUT = 5V
1
0.1 VOUT = 3.3V
0.01
-40
-20
0 20 40 60 80
Temperature (°C)
100 120
Off-Switch Current vs. Temperature
(ENUB = ENLB = VCC; VOUT = 0V)
100
10
VIN = 5V
1
0.1
0.01
-40
-20
VIN = 3.3V
0 20 40 60
Temperature (°C)
80
100 120
Off-Supply Current vs. Temperature
(ENUB = ENLB = VCC; VOUT = Open)
10
VIN = 5V
1
0.1
VIN = 3.3V
0.01
-40
-20
0 20 40 60 80
Temperature (°C)
100 120
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201943A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 15, 2012
5
5 Page 
DATA SHEET
AAT4620
PCMCIA Current Limit Interface and Capacitor Charger
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0.10 0.30 0.50 0.70 0.90 1.10 1.30 1.50
RSETU and RSETL (MΩ)
Figure 1: Calculated Current Limit RSET
Characteristic.
System Ready Hysteresis
(RHYS) and System Ready (RDY)
In internal comparator senses the output voltage and
delivers a ready signal to the external micro controller
when the output voltage reaches 98% of the final value
(VCC). The comparator hysteresis is programmed by a
resistor from the RHYS pin to ground. The RHYS voltage
determines the hysteresis voltage and is equal to the
RHYS source current (1μA) times the RHYS resistance.
VHYST = RHYS · 1μA
= 200kΩ · 1μA
= 0.2V
The system ready pin (RDY) is an open drain output that
switches low when the output voltage reaches 98% of
the input voltage. It requires an external pull up resistor
tied to the input voltage with a typical value of 100k.
Power Loop
The AAT4620 power loop limits the load current in the
event that the device power dissipation becomes exces-
sive. The AAT4620 power loop regulates the die tempera-
ture to 100°C, decreasing the load current in increments
of 1/32 of the current limit set point when the die tem-
perature reaches 100°C. When the die temperature
exceeds 100°C it decreases the load current by 1/32 of
the current limit set point. If die temperature is less than
100°C, it increases the load current in increments of 1/32
of the current limit set point until the set current limit
point is reached or the die temperature exceeds 100°C.
The delay time between die temperature measurements
varies depending on the load current limit set point. The
delay ranges from 1ms for a 75mA current limit set point
to 8ms for a 1.5A current limit set point.
For the condition where there is no current limit set point
(shorting RSETU or RSETL to ground) the soft start incre-
ments the current limit is 1/32 steps of 1.2A until the
current reaches 1.2A, at which point the power MOSFET
turns on fully. At this point, the current is limited by the
RDS(ON) of the power MOSFET and other series resistance.
The Power Loop and Over-Temperature Loop then takes
control to limit the current until the output voltage has
fully charged.
Over-Temperature Protection
If the die temperature rate of rise is fast enough to
exceed the power loop regulated temperature, over-
temperature shutdown disables the device. The over-
temperature threshold is 145°C. After over-temperature
shutdown, soft start is initiated once the die temperature
drops to 130°C.
Short Circuit Protection
The series pass power MOSFET turns off completely after
the output has charged to within 18mV of the input volt-
age. This protects the device in the event of a short
circuit applied to the output. Applying a short circuit or
heavy load to the output initiates the digital soft start
where the current ramps from zero to the final pro-
grammed value. The power loop will be activated once
the digital soft start begins.
Under-Voltage Shutdown
Under-voltage lockout enables the device at 2.7V typical
with 100mV of hysteresis. The maximum UVLO level is
3.0V.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201943A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 15, 2012
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet AAT4620.PDF ] | |
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