AAT4621ITP-T1 AnalogicTech, AAT4621ITP-T1 Datasheet

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AAT4621ITP-T1

Manufacturer Part Number
AAT4621ITP-T1
Description
PC Card Current Limit Interface and Capacitor Charger
Manufacturer
AnalogicTech
Datasheet
General Description
The AAT4621 SmartSwitch 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 conjunc-
tion with a super capacitor, the AAT4621 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 AAT4621 can ensure that the super
capacitor can be charged without exceeding PCM-
CIA 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 hys-
teresis is provided with the addition of an external
resistor. The quiescent supply current is typically a
low 40µA. In shutdown mode, the supply current
decreases to less than 1µA.
The AAT4621 is available in a thermally enhanced,
Pb-free, 12-pin TSOPJW or 14-pin TDFN33 pack-
age and is specified over the -40°C to 85°C tem-
perature range.
Typical Application
4621.2007.07.1.0
EN
EN
OPERATION
SUPERCAP
V
CC
VCC
EN IL
EN IU
GND
Reference
Voltage
Lockout
Under-
1.2V
Blocking
Reverse
Current
Control
Limit
Over-Temp
Protection
Features
Applications
R
HYS
PC Card Current Limit Interface
V
Dual Independent Current Limits
— 75mA 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
65mΩ Typical R
Only 1.4V Needed for Enable Control Pin
System READY Output with Externally
Programmable Hysteresis
Under-Voltage Lockout
Temperature Range: -40 to 85°C
12-Pin TSOPJW Package or 14-Pin TDFN33
Package
Capacitor Charger
CF Card Port Power Protection
Express Card GSM/GPRS/3G Modems
PC Card GSM/GPRS Class 10/12 Modems
WiMAX Cards
Power
Loop
IN
Range: 3.0V to 5.5V
ISETU
ISETL
OUT
RDY
and Capacitor Charger
R
SETU
DS(ON)
SmartSwitch
R
100kΩ
at 3V
SETL
SuperCap
AAT4621
To Load
To μC
1

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AAT4621ITP-T1 Summary of contents

Page 1

General Description The AAT4621 SmartSwitch 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 conjunc- tion with a super capacitor, the AAT4621 will ensure that the ...

Page 2

Pin Descriptions Pin # Symbol TSOPJW-12 TDFN33- GND 10, 11 VCC OUT 9 4 ISETL 10 3 ISETU 11 2 ...

Page 3

Absolute Maximum Ratings Symbol Description V VCC to GND GND SET, OUT to GND SET OUT I Maximum Continuous Switch Current MAX Thermal Characteristics Symbol Description θ Maximum Thermal Resistance JA P ...

Page 4

Electrical Characteristics V = 3.0V to 5.5V -40°C to 85°C unless otherwise noted. Typical values are Symbol Description V Operation Voltage CC I Quiescent Current Q I Quiescent Current U QU0 0 I Off ...

Page 5

Typical Characteristics Output Current vs. Output Voltage = 249KΩ Ω 25°C) (R SETU 0.30 0. 0.20 0.15 0. 3.3V IN 0.05 0.00 0 0.5 1 1.5 2 2.5 3 Output Voltage (V) Reverse ...

Page 6

Typical Characteristics R vs. Input Voltage DS(ON) = 0kΩ Ω SET 2.5 3 3.5 4 Input Voltage (V) V vs. R RHYS RHYS 2.00 1.80 1.60 1.40 1.20 1.00 0.80 0.60 0.40 ...

Page 7

Typical Characteristics V and V vs. Input Voltage IH IL (ENUB = Open; Vary ENLB 25°C) 1 1.0 0.9 0 0.7 0.6 2.5 3.5 4.5 5.5 Input Voltage (V) Soft Short Circuit with 5Ω ...

Page 8

Typical Characteristics Charging Profile (I = 150mA 4.5V; C LIMIT OUT OUT Time (5s/div) GSM900 GPRS Class 12 Transmit 1-Slot Ch975, 33dBm V = 3.83V 3.80V OUT I ...

Page 9

Functional Block Diagram VCC Under- Voltage Lockout 1.2V Reference GND Functional Description The AAT4621 is an integrated P-channel MOSFET load switch with an upper and lower adjustable cur- rent limits which can be enabled independently, over ...

Page 10

SET pins and ground. The minimum current limit threshold is specified the load condition maintains LIM(MIN) the device in current limit and the chip temperature reaches a critical point, then ...

Page 11

I vs. R and R LOAD SETU 1.2 1.0 0.8 0.6 0.4 0.2 0.0 0.10 0.30 0.50 0.70 0.90 (MΩ Ω and R SETU SETL Figure 1: Calculated Current Limit R Characteristic. System Ready Hysteresis (RHYS) and System ...

Page 12

Digitally Programmed Soft Start Current Limit At turn on, the digital soft start increases the load current in discrete levels equal to 1/32 of the final programmed current limit set point from zero to the final programmed current limit level. ...

Page 13

Figure 3: AAT4621 TSOPJW-12 Evaluation Board PCB Top Side. Figure 4: AAT4621 TSOPJW-12 Evaluation Board PCB Bottom Side. 4621.2007.07.1.0 AAT4621 PC Card Current Limit Interface and Capacitor Charger 13 ...

Page 14

Figure 5: AAT4621 TDFN33-14 Evaluation Board PCB Top Side Figure 6: AAT4621 TDFN33-14 Evaluation Board PCB Bottom Side 14 AAT4621 PC Card Current Limit Interface and Capacitor Charger 4621.2007.07.1.0 ...

Page 15

... A solder fillet at the exposed copper edge cannot be guaranteed and is not required to ensure a proper bottom solder connection. 4621.2007.07.1.0 PC Card Current Limit Interface Marking 1 YWXYY TSOPJW-12 + 0.10 0.20 - 0.05 7° NOM 4° ± 4° 0.055 ± 0.045 0.010 AAT4621 and Capacitor Charger Part Number (Tape and Reel) 2 AAT4621ITP-T1 AAT4621IWO-T1 0.04 REF 0.45 ± 0.1 5 2.75 ± 0.25 15 ...

Page 16

... AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech product. No circuit patent licenses, copyrights, mask work rights, or other intellectual property rights are implied. AnalogicTech reserves the right to make changes to their products or specifications or to discontinue any product or service with- out notice. Except as provided in AnalogicTech’ ...

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