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PDF AAT4621 Data sheet ( Hoja de datos )
| Número de pieza | AAT4621 | |
| Descripción | PC Card Current Limit Interface and Capacitor Charger | |
| Fabricantes | Skyworks | |
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DATA SHEET
AAT4621
PC Card Current Limit Interface and Capacitor Charger
General Description
The AAT4621 SmartSwitch family is a current limited
P-channel MOSFET power switch designed for high-side
load-switching applications in PC Card GSM/GPRS/3G
modem cards. Used in conjunction with a super capaci-
tor, the AAT4621 will ensure that the power ratings of
the PCMCIA host are not exceeded at any time. Featuring
two independent, programmable current limits and a
power loop, the AAT4621 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 AAT4621 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 current is typically a low 40μA. In shut-
down mode, the supply current decreases to less than
1μA. The AAT4621 has a current limit range from 75mA
to 1200mA; the AAT4621-1 has a current limit range
from 150mA to 2400mA.
The AAT4621 is available in a thermally enhanced,
Pb-free 14-pin TDFN33 package and is specified over the
-40°C to 85°C temperature range.
Features
• Operating Voltage Range: 3.0V to 5.5V
• Dual Independent Current Limits
▪ AAT4621: 75mA to 1200mA
▪ AAT4621-1: 150mA to 2400mA
▪ ±10% Current Accuracy
• Reverse Current Blocking Protection
• Power Loop
• Low Quiescent Current
▪ 40μA Typical
▪ 1.0μA Max with Switch Off
• 65m Typical RDS(ON) at 3V
• System READY Output with Externally Programmable
Hysteresis
• Only 1.4V Needed for Enable Control Pin
• Under-Voltage Lockout
• Over-Temperature Protection
• Temperature Range: -40 to 85°C
• 14-Pin TDFN33 Package
Applications
• Capacitor Charger
• CF Card Port Power Protection
• Express Card GSM/GPRS/3G Modems
• PC Card GSM/GPRS Class 10/12 Modems
• WiMAX Cards
Typical Application
VCC
ENIL
ENIU
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
100k
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
201944A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 15, 2012
1
1 page  
DATA SHEET
AAT4621
PC Card Current Limit Interface and Capacitor Charger
Electrical Characteristics1
VCC = 3.0V to 5.5V, TA = -40°C to 85°C unless otherwise noted. Typical values are at TA = 25°C.
Symbol Description
AAT4621-1
VCC
IQ
IQ(OFF)
ISD(OFF)
VUVLO
Operation Voltage
Quiescent Current
Off Supply Current
Off Switch Current
Under-Voltage Lockout
Hysteresis
RDS(ON) On-Resistance
ILIMACC Lower Current Limit Accuracy
ILIMACC
ILIM(MIN)
VEN(L)
VEN(H)
IEN(SINK)
TDEL(OFF)
VRDY
VRDYHYS
VRDY(L)
IRDY
OTMP
Upper Current Limit Accuracy
Minimum Current Limit
EN Input Low Voltage, VENLU
EN Input Low Voltage, VENLL
EN Input High Voltage, VENHU
EN Input High Voltage, VENHL
EN Input Leakage
Turn-Off Delay Time
System Ready Trip Threshold
System Ready Hysteresis
System Ready Voltage Low
RDY_ Leakage Current
Shutdown Temperature
Conditions
ENIL or ENIU = 0V, IOUT = 0; RHYS = 200kΩ
ENIL = ENIU = High, VOUT = Open
ENIL = ENIU = High, VOUT = 0V
Rising Edge
VCC = 4.75V, RSETU = RSETL = 0K
VCC = 3.0V, RSETU = RSETL = 0K
RSETL = 249KΩ; ΔTA ≤ 25°C
RSETL = 249KΩ
RSETU = 1.24MΩ; ΔTA ≤ 20°C,
RSETU = 1.24MΩ ,
VCC = 3.0 to 5.5V
VCC = 3.0 to 5.5V
VCC = 3.0 to 5.5V
VCC = 3.0 to 5.5V
VEN = 5.5V
VCC = 5.0V
VOUT Rising, TA = 25°C (VIN = 3.3V)
RHYS = 200KΩ
ISINK = 1mA
VRDY < 5.5V, VOUT < 98% Of VOUT
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
Min Typ Max Units
3
360
340
1800
1700
1.4
1.4
40
0.4
0.4
2.7
120
50
65
400
400
2000
2000
150
5.5
75
1
10
3
100
120
440
460
2200
2300
0.4
0.4
1
0.4 1
98
200
0.4
1
150
15
V
μA
μA
μA
V
mV
mΩ
mA
mA
mA
V
V
V
V
μA
μs
% of VOUT
mV
V
μA
°C
1. The AAT4621 is guaranteed to meet performance specification over the -40°C to 85°C operating temperature range and is assured by design, characterization and correlation
with statistical process controls.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201944A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 15, 2012
5
5 Page 
DATA SHEET
AAT4621
PC Card Current Limit Interface and Capacitor Charger
Functional Block Diagram
VCC
Reverse
Blocking
OUT
EN IL
EN IU
Under-
Voltage
Lockout
Over-Temp
Protection
Power
Loop
RDY
1.2V
Reference
Current Limit
Control
ISETL
ISETU
GND
Functional Description
The AAT4621 SmartSwitch family is an integrated
P-channel MOSFET load switch with an upper and lower
adjustable current limits which can be enabled indepen-
dently, over temperature protection, a power loop and a
super capacitor charger. The current limit control is com-
bined with an over temperature thermal limit and power
loop circuit to provide a comprehensive system to pro-
tect the load switch and its supply from load conditions
which exceed the supply specifications. The AAT4621
has been designed specifically to provide the interface
between a PCMCIA host and PC card where a super
capacitor has been used to “average out” high pulse cur-
rents which would otherwise exceed the PCMCIA/
Express Card power specifications. e.g. GSM/ GPRS
modem cards, where pulse currents during transmit sig-
nals can exceed the 1A maximum specification (1.3A in
the case of Express Card).
The current limit and over temperature circuits act inde-
pendently. The device current limit is activated when the
output load current exceeds an internal threshold level.
There are two internal current limits which are enabled
independently. The current limit threshold in each case
is determined by external resistors connected between
the two SET pins and ground. The minimum current limit
RHYS
threshold is specified by ILIM(MIN). If the load condition
maintains the device in current limit and the chip tem-
perature 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 protection
allowing a low impedance path to the host VCC.
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 AAT4621 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 AAT4621 typically consumes 40μA when
operating, when off, the device draws less then 1μA. In
the off state, current is prevented from flowing between
the input and output.
Under-voltage lockout circuitry ensures that the VCC sup-
ply is high enough for correct operation of the IC. Also
included is a System Ready function which will be acti-
vated 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.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201944A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 15, 2012
11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet AAT4621.PDF ] | |
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