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PDF AP2155 Data sheet ( Hoja de datos )
| Número de pieza | AP2155 | |
| Descripción | (AP2145 / AP2155) 0.5A SINGLE CHANNEL CURRENT-LIMITED POWER SWITCH | |
| Fabricantes | Diodes Incorporated | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AP2155 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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Features
AP2145/AP2155
0.5A SINGLE CHANNEL CURRENT-LIMITED POWER
SWITCH
Description
• Single USB port power switches
The AP2145 and AP2155 are integrated high-side power switches
• Over-current and thermal protection
optimized for Universal Serial Bus (USB) and other hot-swap
• 0.8A accurate current limiting
applications. The family of devices complies with USB 2.0 and
• Reverse Current Blocking
• 90mΩ on-resistance
available with both polarities of Enable input. They offer current
and thermal limiting and short circuit protection as well as
• Input voltage range: 2.7V – 5.5V
controlled rise time and under-voltage lockout functionality. A 7ms
• 0.6ms typical rise time
deglitch capability on the open-drain Flag output prevents false
• Very low shutdown current: 1uA (max)
over-current reporting and does not require any external
• Fault report (FLG) with blanking time (7ms typ)
components.
• ESD protection: 6KV HBM, 400V MM
• Active high (AP2155) or active low (AP2145) enable
• Ambient temperature range -40ºC to 85°C
All devices are available in SOP-8L and MSOP-8L-EP packages.
• SOP-8L and MSOP-8L-EP (Exposed Pad): Available in
“Green” Molding Compound (No Br, Sb)
• Lead Free Finish/ RoHS Compliant (Note 1)
• UL Recognized, File Number E322375 (pending)
• IEC60950-1 CB Scheme Certified
Applications
• Consumer electronics – LCD TV & Monitor, Game Machines
• Communications – Set-Top-Box, GPS, Smartphone
• Computing – Laptop, Desktop, Servers, Printers, Docking Station, HUB
Typical Application Circuit
www.DataSheet4U.com AP2155 Enable Active High
Power Supply
2.7V to 5.5V
IN OUT
10k 10uF 0.1uF
ON
OFF
FLG
EN GND
Load
0.1uF
120uF
Available Options
Part Number Channel
AP2145
AP2155
1
1
Enable pin (EN)
Active Low
Active High
Current limit
(typical)
0.8A
0.8A
Recommended maximum
continuous load current
0.5A
0.5A
AP2145/AP2155 Rev. 1
1 of 14
www.diodes.com
DECEMBER 2009
© Diodes Incorporated
1 page  
AP2145/AP2155
0.5A SINGLE CHANNEL CURRENT-LIMITED POWER
SWITCH
Typical Performance Characteristics
VEN
VOUT
50%
50%
VEN
50%
50%
TR
TD(ON)
90%
10%
TD(OFF)
TF
90%
10%
VOUT
TR
TD(ON)
90%
10%
TD(OFF)
TF
90%
10%
Figure 1. Voltage Waveforms: AP2145 (left), AP2155 (right)
All Enable Plots are for AP2155 Active High
Turn-On Delay and Rise Time
Turn-Off Delay and Fall Time
Ven
5V/div
Ven
5V/div
Vout
2V/div
www.DataSheet4U.com
500us/div
CL=1uF
TA=25°C
RL=10Ω
Turn-On Delay and Rise Time
Vout
2V/div
500us/div
CL=1uF
TA=25°C
RL=10Ω
Turn-Off Delay and Fall Time
Ven
5V/div
Vout
2V/div
500us/div
Ven
5V/div
CL=100uF
TA=25°C
RL=10Ω
Vout
2V/div
500us/div
CL=100uF
TA=25°C
RL=10Ω
AP2145/AP2155 Rev. 1
5 of 14
www.diodes.com
DECEMBER 2009
© Diodes Incorporated
5 Page 
AP2145/AP2155
0.5A SINGLE CHANNEL CURRENT-LIMITED POWER
SWITCH
Application Note (Continued)
Power Dissipation and Junction Temperature
The low on-resistance of the internal MOSFET allows the small surface-mount packages to pass large
current. Using the maximum operating ambient temperature (TA) and RDS(ON), the power dissipation can be
calculated by:
PD = RDS(ON)× I2
Finally, calculate the junction temperature:
TJ = PD x RθJA + TA
Where:
TA= Ambient temperature °C
RθJA = Thermal resistance
PD = Total power dissipation
Thermal Protection
Thermal protection prevents the IC from damage when heavy-overload or short-circuit faults are present for
extended periods of time. The AP2145/AP2155 implements a thermal sensing to monitor the operating
junction temperature of the power distribution switch. Once the die temperature rises to approximately 140°C
due to excessive power dissipation in an over-current or short-circuit condition the internal thermal sense
circuitry turns the power switch off, thus preventing the power switch from damage. Hysteresis is built into
the thermal sense circuit allowing the device to cool down approximately 25°C before the switch turns back
on. The switch continues to cycle in this manner until the load fault or input power is removed. The
FLG open-drain output is asserted when an over-temperature shutdown or over-current occurs with 7-ms
deglitch.
Under-voltage Lockout (UVLO)
Under-voltage lockout function (UVLO) keeps the internal power switch from being turned on until the power
supply has reached at least 1.9V, even if the switch is enabled. Whenever the input voltage falls below
approximately 1.9V, the power switch is quickly turned off. This facilitates the design of hot-insertion systems
www.DataSheweth4Ue.rceomit is not possible to turn off the power switch before input power is removed.
Generic Hot-Plug Applications
In many applications it may be necessary to remove modules or pc boards while the main unit is still
operating. These are considered hot-plug applications. Such implementations require the control of current
surges seen by the main power supply and the card being inserted. The most effective way to control these
surges is to limit and slowly ramp the current and voltage being applied to the card, similar to the way in
which a power supply normally turns on. Due to the controlled rise times and fall times of the
AP2145/AP2155, these devices can be used to provide a softer start-up to devices being hot-plugged into a
powered system. The UVLO feature of the AP2145/AP2155 also ensures that the switch is off after the card
has been removed, and that the switch is off during the next insertion.
By placing the AP2145/AP2155 between the VCC input and the rest of the circuitry, the input power reaches
these devices first after insertion. The typical rise time of the switch is approximately 1ms, providing a slow
voltage ramp at the output of the device. This implementation controls system surge current and provides a
hot-plugging mechanism for any device.
AP2145/AP2155 Rev. 1
11 of 14
www.diodes.com
DECEMBER 2009
© Diodes Incorporated
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet AP2155.PDF ] | |
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