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PDF APL3521 Data sheet ( Hoja de datos )
| Número de pieza | APL3521 | |
| Descripción | Power-Distribution Switches | |
| Fabricantes | ANPEC | |
| Logotipo |  |
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APL3521
Power-Distribution Switches
Features
General Description
• 90mΩ High Side MOSFET
• 2A Continuous Current
• Built-in Soft-Start Control
• Wide Supply Voltage Range: 2.7V to 5.5V
• Current-Limit and Short-Circuit Protections
• Under-Voltage Lockout Protection
• Reverse Current Blocking when Switch Disabled
• Over-Temperature Protection
• Logic Level Enable Input
APL3521A: Active High
APL3521B: Active Low
• Lead Free and Green Devices Available
(RoHS Compliant)
Applications
• TFT LCD Modules
• Notebook and Desktop Computers
• USB Ports
• High-Side Power Protection Switches
The APL3521A/B is a power-distribution switch with some
protection functions that can deliver current up to 2A. The
device incorporates a 90mΩ N-channel MOSFET power
switch that is controlled by an enable logic.
The device integrates some protection features, includ-
ing current-limit protection, short-circuit protection, over-
temperature protection, and UVLO. The current-limit and
short-circuit protection can protect down-stream devices
from catastrophic failure by limiting the output current at
current-limit threshold during over-load or short-circuit
events. When V drops below V -1.5V the devices limit
OUT
IN
the current to a lower and safe level. The over-tempera-
ture protection function shuts down the N-channel
MOSFET power switch when the junction temperature
rises beyond 140oC and will automatically turns on the
power switch when the temperature drops by 20oC. The
UVLO function keeps the power switch in off state until
there is a valid input voltage present.
The device is available in lead free SOT-23-5 packages
with enable active-high(EN) and active-low(ENB) versions.
Simplified Application Circuit Pin Configuration
VIN
EN
Control
APL3521A/B
VIN VOUT
EN/ ENB
GND
VOUT
VOUT 1
GND 2
EN 3
5 VIN
4 NC
SOT-23-5
APL3521A
VOUT 1
GND 2
ENB 3
5 VIN
4 NC
SOT-23-5
APL3521B
ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and
advise customers to obtain the latest version of relevant information to verify before placing orders.
Copyright © ANPEC Electronics Corp.
Rev. A.1 - Aug., 2012
1
www.anpec.com.tw
Free Datasheet http://www.datasheet4u.com/
1 page  
APL3521
Typical Operating Characteristics (Cont.)
Short-Circuit Output Current vs.
Input Voltage
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
Input Voltage (V)
Turn-On Rising Time vs. Junction
Temperature
2.0
VIN = 5V, RLOAD =30Ω,
CIN = 1µF/X7R, COUT =33µF/Electrolytic
1.5
1.0
0.5
0.0
-50
0 50 100
Junction Temperature (oC)
150
2.1
2.0
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
2.5
EN Pin Threshold Voltage vs.
Input Voltage
EN Rising
EN Falling
RLOAD =50Ω,
CIN = COUT =33µF/
Elctrolytic, TA=25oC
3.0 3.5 4.0 4.5 5.0 5.5
Input Voltage (V)
Current-Limit Response vs.
Output Peak Current
250
VIN =5V,
200
150
100
50
0 0 2 4 6 8 10 12
Output Peak Current (A)
VIN UVLO Threshold Voltage vs.
Junction Temperature
3.2
2.8
UVLO Rising
2.4
2.0 UVLO Falling
1.6
1.2 IOUT =15mA,
CIN = 1µF/X7R, COUT =33µF/Electrolytic
0.8
-50 0
50 100 150
Junction Temperature (oC)
EN Pin Threshold Voltage vs.
Junction Temperature
3.0
2.5
2.0 EN Rising
1.5 EN Falling
1.0
VIN =5V, RLOAD =50Ω,
0.5 CIN = COUT =33µF/Elctrolytic
-50 0
50
100
Junction Temperature (oC)
150
Copyright © ANPEC Electronics Corp.
Rev. A.1 - Aug., 2012
5
www.anpec.com.tw
Free Datasheet http://www.datasheet4u.com/
5 Page 
APL3521
Function Description
VIN Under-Voltage Lockout (UVLO)
The APL3521A/B power switch is built-in an under-volt-
age lockout circuit to keep the output shut off until internal
circuitry is operating properly. The UVLO circuit has hys-
teresis and a de-glitch feature so that it will typically ig-
nore undershoot transients on the input. When input volt-
age exceeds the UVLO threshold, the output voltage starts
a soft-start to reduce the inrush current.
Power Switch
The power switch is an N-channel MOSFET with a low
RDS(ON). The internal power MOSFET does not have the
body diode. When IC is off, the MOSFET prevents a cur-
rent flowing from the VOUT back to VIN and VIN to VOUT.
Current-Limit Protection
The APL3521A/B power switch provides the current-limit
protection function. During current-limit, the devices limit
output current at current-limit threshold. For reliable
operation, the device should not be operated in current-
limit for extended period.
Short-Circuit Protection
When the output voltage drops below VIN-1.5V, which is
caused by the over load or short-circuit, the devices limit
the output current down to a safe level. The short circuit
current-limit is used to reduce the power dissipation dur-
ing short-circuit condition. If the junction temperature is
over the thermal shutdown temperature, the device will
enter the thermal shutdown.
Soft-Start
The APL3521 has a built-in soft start to control the rise
rate of the during start-up. The softstart time is 2ms when
V =5V.
IN
Enable/Disable
Pull the ENB above 2V, or EN below 0.8V to disable the
device and pull ENB pin below 0.8V or EN above 2V to
enable the device. When the IC is disabled, the supply
current is reduced to less than 1µA. The enable input is
compatible with both TTL and CMOS logic levels. The
EN/ENB pins cannot be left floating.
Over-Temperature Protection
When the junction temperature exceeds 140oC, the inter-
nal thermal sense circuit turns off the power FET and
allows the device to cool down. When the device’s junc-
tion temperature cools by 20oC, the internal thermal
sense circuit will enable the device, resulting in a pulsed
output during continuous thermal protection. Thermal
protection is designed to protect the IC in the event of
over-temperature conditions. For normal operation, the
junction temperature cannot exceed TJ=+125oC.
Copyright © ANPEC Electronics Corp.
Rev. A.1 - Aug., 2012
11
www.anpec.com.tw
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet APL3521.PDF ] | |
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