UZXYY ANALOGICTECH [Advanced Analogic Technologies], UZXYY Datasheet

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UZXYY

Manufacturer Part Number
UZXYY
Description
PCMCIA Current Limit Interface and Capacitor Charger
Manufacturer
ANALOGICTECH [Advanced Analogic Technologies]
Datasheet
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 conjunc-
tion 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 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 AAT4620
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 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.
Typical Application
4620.2007.04.1.1
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
PCMCIA Current Limit Interface
V
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
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
CF Card Port Power Protection
Express Card GSM/GPRS/3G Modems
Hot Swap Supplies
PCMCIA Card GSM/GPRS/3G Modems
Personal Communication Devices
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
AAT4620
To Load
To μC
1

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UZXYY Summary of contents

Page 1

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 conjunc- tion with a super capacitor, the AAT4620 will ensure that the power ...

Page 2

Pin Descriptions Pin # Symbol Function Enable input. Active low enable with internal pull up. Also switches in the higher current limit to allow the System to start functioning. Can be directly connected to System Ready for ...

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 = 383kΩ Ω , 25°C) (R SETU 0. 3.3V IN 0.30 0.20 0.10 0.00 0 0.3 0.6 0.9 1.2 1.5 1.8 Output Voltage (V) Reverse Off-Switch Current vs. Temperature (E = ...

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 vs. Input Voltage Open; Vary E NUB 1.1 1.0 0.9 0.8 0.7 0.6 2.5 3.5 4.5 5.5 Input Voltage (V) V vs. Input Voltage Open; Vary E NLB NUB 1.1 1.0 ...

Page 8

Typical Characteristics Short Circuit with 5Ω Ω Series Impedance (V = 3.3V Time (200ms/div) Charging Profile (I = 150mA 5V; C LIMIT Time (5s/div) Charging Profile (I = 1A; ...

Page 9

Functional Block Diagram VCC Under- Voltage Lockout 1.2V Reference GND Functional Description The AAT4620 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 4: AAT4620 Evaluation Board PCB Bottom Side. 4620.2007.04.1.1 AAT4620 PCMCIA Current Limit Interface and Capacitor Charger 13 ...

Page 14

... Package Information 0.50 BSC 0.50 BSC 0.50 BSC 0.50 BSC 0.50 BSC 3.00 ± 0.10 All dimensions in millimeters. 1. XYY = assembly and date code. 2. Sample stock is generally held on part numbers listed in BOLD. 14 PCMCIA Current Limit Interface Marking 1 UZXYY TSOPJW-12 + 0.10 0.20 - 0.05 7° NOM 4° ± 4° 0.055 ± 0.045 0.010 AAT4620 ...

Page 15

Advanced Analogic Technologies, Inc. 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 ...

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