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PDF AAT4702 Data sheet ( Hoja de datos )
| Número de pieza | AAT4702 | |
| Descripción | Auto-Restarting Current Limiting Load Switch | |
| Fabricantes | Skyworks | |
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DATA SHEET
AAT4702
Auto-Restarting Current Limiting Load Switch with LDO Regulator
General Description
The AAT4702 SmartSwitch™ is a member of Skyworks'
Application Specific Power MOSFET™ (ASPM™) product
family. This device integrates a high side P-channel
MOSFET current limiting load switch with a nanopower
low dropout (LDO) linear voltage regulator, making the
AAT4702 ideal for use in load current protected applica-
tions that also require a system power supply. The load
switch operates with input voltages ranging from 2.4V to
5.5V, making it ideal for 2.5V, 3V, and 5V systems. A
fault flag is provided to alert the system to an over-
current event. The fault flag has a 5ms blanking time to
prevent from reporting false events such as inrush cur-
rents during system startup.
The load switch current limit is 150mA by default or pro-
grammed up to 1A through an external set resistor.
The AAT4702 LDO linear regulator is designed to deliver
a regulated 1.8V supply voltage for load levels up to
100mA. The regulator section may be powered directly
from an input source supply or from the load switch out-
put.
The AAT4702 is offered in a Pb-free, space-saving 8-pin
2x2mm FTDFN22 package, and is specified for operation
over the -40°C to +85°C ambient temperature range.
Features
Load Switch:
2.4V-5.5V Input Voltage Range
150mA Default Current Limit Level
270m Typical RDS(ON) at 2.4V
400ns Response to Short Circuit
Reverse Voltage Protection
Current Limit Shutdown with Output Pull Down
Auto Restart with 40ms Timer
5ms Fault Blanking Timeout
Under-Voltage Lockout Protection
LDO Regulator:
Output Current up to 100mA
1.8V Output Voltage with ±2% Accuracy
Thermal and Short Circuit Protection
Active Shutdown Output Pull-Down
Low Quiescent Current 15μA Typical for Switch and
LDO
Less than 1μA Shutdown Current
Only 1μF Ceramic Output Capacitor Required
Available in FTDFN22-8L Package.
Applications
Cell Phones
Device Peripheral Ports
Fingerprint Sensors
Hot Swap Supplies
Media Players
Notebook Computers
Typical Application
INPUT
ENABLE
FAULT FLAG
1μF
N/C
IN OUT
AAT4702
SET IN_REG
ON / ON
VREG
FLT
GND
1μF
OUTPUT
LDO REG OUTPUT
1μF
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201964A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 17, 2012
1
1 page  
DATA SHEET
AAT4702
Auto-Restarting Current Limiting Load Switch with LDO Regulator
Typical Characteristics−General
Unless otherwise noted, VIN= 3.6V, CIN = 1μF, COUT = 1μF, COUT-LDO = 1μF ,TA = 25°C.
Quiescent Current vs. Temperature
(Load Switch + LDO)
30
25
20
15
10
5
0
-40
VIN = 5.5V
VIN = 4.2V
VIN = 3.3V
-15 10 35 60 85
Temperature (°C)
Quiescent Current vs. Input Voltage
(Load Switch + LDO)
30
25
20
15
10
5
0
0.5 1.5 2.5 3.5 4.5
Input Voltage (V)
5.5
VEN(H) and VEN(L) vs. Input Voltage
2.4
1.9
1.4
0.9
VEN(H)
VEN(L)
0.4
2 2.5 3 3.5 4 4.5 5 5.5
Input Voltage (V)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201964A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 17, 2012
5
5 Page 
DATA SHEET
AAT4702
Auto-Restarting Current Limiting Load Switch with LDO Regulator
ground. When the over-current condition is removed, the
AAT4702 will automatically resume normal operation.
The internal load switch controller provides a fault flag
function to alert a system controller to any over current
or temperature event. The fault flag output consists of
an open drain NMOS switch that should be pulled to a
logic high level externally through a 10k or greater
value resistor. The fault flag has a 5ms blanking time
feature to guard against reporting false fault conditions,
such events could happen during normal circuit start-up.
If the fault flag function is not required, the FLT pin may
be left unconnected.
When operating within the limits set by the default or
user programmed current limit level, the device over-
temperature protection will monitor the internal die tem-
perature. If the internal die temperature exceeds 140°C,
the thermal protection circuit will shut down the load
switch to protect the loaded device and the system sup-
ply source.
The AAT4702 load switch and LDO regulator are enabled
and disabled through common enable signal at the ON
(ON) pin. The AAT4702 provides options for both active
low (default) and/or active high operation; refer to the
Ordering Information table to select the desired enable
polarity. If the device is operated in an always-on state,
the enable function may be terminated to GND or IN
respective to which active low or high option is selected.
The AAT4702 load switch has an under-voltage lockout
(UVLO) function, which senses the voltage of the IN pin.
Once VIN > VUVLO rising edge (typical 1.8V), the AAT4702
will start to operate. For the LDO regulator input IN_REG
pin, there is no UVLO.
Low Dropout Linear Regulator
The AAT4702 LDO linear regulator section has an inde-
pendent input pin allowing the regulator to be powered
by the load switch output or directly from an input sup-
ply. When the enable pin switches to an active state, the
LDO regulator output will typically start up and stabilize
regulation within 1ms after the load switch.
The LDO regulator output is designed and tested to
maintain voltage regulation accuracy within a 2% toler-
ance. Voltage regulation accuracy is maintained for input
voltage ranges from 5.5V down to a minimum input level
(VIN_MIN) which is defined by the factory trimmed output
voltage level (VOUT) plus the specified regulator dropout
voltage level (VDO), by following the formula:
VIN_MIN = VOUT + VDO
Where:
VIN_MIN = Minimum input voltage applied to the IN_REG
pin to maintain regulation
VOUT = Factory set LDO regulator output as measured at
the VREG pin
VDO = Specified LDO regulator dropout voltage
Should the LDO regulator input supply fall below the
required VIN_MIN level, the output is designed to track the
input supply minus a nominal voltage drop across the
regulator’s high-side P-channel MOSFET caused by the
device's on resistance. The regulator is designed to
maintain a stable linear output level of 1.8V for an input
supply level down to 2.4V at the specified load current
level of 100mA.
During LDO regulator shutdown, the VREG output is
internally connected to ground via a series resistor and
a low-side NMOS switch which have a combined imped-
ance of 100. The LDO regulator has over-temperature
and short-circuit protection independent to the load
switch for comprehensive device protection.
Since the system enable is common to both the LDO
regulator and load switch, the LDO regulator will shut
down in the event of a fault occurring on the load switch
output. For the case of LDO regulator shut down via a
load switch fault, the LDO regulator automatically
restarts along with the load switch auto-restart system
with a 1ms delay. When the LDO regulator is shut down
by either the enable function or a fault on the load switch
output, the regulator output load will be discharged
through the internal active output pull-down circuit.
The AAT4702 LDO regulator has high power supply ripple
rejection (PSRR) in addition to fast load and line tran-
sient response characteristics. The LDO regulator output
has been specifically optimized to function with low cost,
low-ESR ceramic capacitors.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201964A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 17, 2012
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet AAT4702.PDF ] | |
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