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AAT4620 Schematic ( PDF Datasheet ) - Skyworks

Teilenummer AAT4620
Beschreibung PCMCIA Current Limit Interface and Capacitor Charger
Hersteller Skyworks
Logo Skyworks Logo 




Gesamt 14 Seiten
AAT4620 Datasheet, Funktion
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
65mTypical 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






AAT4620 Datasheet, Funktion
DATA SHEET
AAT4620
PCMCIA Current Limit Interface and Capacitor Charger
Typical Characteristics
RDS(ON) vs. Input Voltage
(RSET = 0kΩ)
70
65
60
55
50
45
2.5 3 3.5 4 4.5 5 5.5
Input Voltage (V)
90
80
70
60
50
40
30
-40
RDS(ON) vs. Temperature
(RSET = 0Ω)
VIN = 3V
VIN = 5V
-20 0
20 40 60 80 100
Temperature (°C)
2.00
1.80
1.60
1.40
1.20
1.00
0.80
0.60
0.40
0.20
0.00
0
VRHYS vs. RRHYS
500 1000
RRHYS (kΩ)
1500
ILIM vs. Temperature
(VIN = 4V; VOUT = 3.85V; ENLB = 0V; RSET = 249kΩ)
210
205
200
195
190
-50
-25
0 25 50
Temperature (°C)
75 100
ILIM vs. Temperature
(VIN = 4V; VOUT = 3.85V; ENUB = 0V; RSET = 1.24MΩ)
1020
1000
980
960
-50 -25 0 25 50
Temperature (°C)
75 100
Quiescent Current IQL vs. Temperature
(ENLB = 0V; ENUB = VCC; VOUT = Open)
50
45 VIN = 5V
40
35
30 VIN = 3.3V
25
20
-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
6 201943A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 15, 2012

6 Page









AAT4620 pdf, datenblatt
DATA SHEET
AAT4620
PCMCIA Current Limit Interface and Capacitor Charger
Digitally Programmed
Soft Start Current Limit
At turn on, the digital soft start increases the load cur-
rent in discrete levels equal to 1/32 of the final pro-
grammed current limit set point from zero to the final
programmed current limit level.
Reverse Current Blocking
An internal comparator disables the internal pass tran-
sistor when the input voltage is less than the output
voltage blocking any reverse current from the output to
the input.
Evaluation Board
The evaluation board schematic is shown in Figure 2.
The PCB layout is shown in Figures 3 and 4.
J2
3
2
1
ENIU
J1
3
2
1
ENIL
VCC 2
GND 1
J4
R1
4.7K
D1
1 ENIU
RDY 12
2 ENIL
RHYS 11
3 GND
ISETU 10
4 VCC
ISETL 9
5 VCC
OUT 8
6 VCC
OUT 7
AAT4620
C1
10μF
C2
10μF
RDY
R3
1.00M
R4
120K
R2
200K
1 Out
2 GND
J3
Figure 2: AAT4620 Evaluation Board Schematic.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
12 201943A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 15, 2012

12 Page





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