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PDF AP2151A Data sheet ( Hoja de datos )
| Número de pieza | AP2151A | |
| Descripción | 0.5A SINGLE CHANNEL CURRENT-LIMITED POWER SWITCH | |
| Fabricantes | Diodes | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AP2151A (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
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AP2141A/ AP2151A
0.5A SINGLE CHANNEL CURRENT-LIMITED POWER SWITCH
Description
The AP2141A and AP2151A are integrated high-side power switches
optimized for Universal Serial Bus (USB) and other hot-swap
applications. The family of devices complies with USB 2.0 and is
available with both polarities of Enable input. They offer current and
thermal limiting and short circuit protection as well as controlled rise
time and under-voltage lockout functionality. A 7ms deglitch capability
on the open-drain Flag output prevents false over-current reporting
and does not require any external components.
Pin Assignments
All devices are available in SO-8, MSOP-8EP, SOT25, and
U-DFN2018-6 packages.
Features
• Single USB Port Power Switches
• Over-Current and Thermal Protection
• 0.8A Accurate Current Limiting
• Reverse Current Blocking
• 95mΩ On-Resistance
• Input Voltage Range: 2.7V - 5.5V
• 0.6ms Typical Rise Time
• Very Low Shutdown Current: 1µA (max)
• Fault Report (FLG) with Blanking Time (7ms typ)
• ESD Protection: 4kV HBM, 400V MM
• Active High (AP2151A) or Active Low (AP2141A) Enable
• Ambient Temperature Range -40°C to +85°C
• SOT25, SO-8, MSOP-8EP (Exposed Pad), and U-DFN2018-6:
Available in “Green” Molding Compound (No Br, Sb)
• Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
• Halogen and Antimony Free. “Green” Device (Note 3)
• 15kV ESD Protection per IEC 61000-4-2 (with external
capacitance)
• UL Recognized, File Number E322375
• IEC60950-1 CB Scheme Certified
( Top View )
OUT 1
GND 2
FLG 3
5 IN
4 EN
SOT25
Applications
• Consumer Electronics – LCD TVs & Monitors, Game Machines
• Communications – Set-Top-Boxes, GPS Systems, Smartphones
• Computing – Laptops, Desktops, Servers, Printers, Docking
Stations, HUBs
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
AP2141A/ AP2151A
Document number: DS37615 Rev. 1 - 2
1 of 17
www.diodes.com
March 2015
© Diodes Incorporated
1 page  
Typical Performance Characteristics
AP2141A/ AP2151A
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: AP2141A (left), AP2151A (right)
All Enable Plots are for AP2151A Active High
Turn-On Delay and Rise Time
Turn-Off Delay and Fall Time
VEN
5V/div
VOUT
2V/div
VEN
5V/div
VOUT
2V/div
500µs/div
CL = 1µF
TA = +25°C
RL =10Ω
Turn-On Delay and Rise Time
VEN
5V/div
VOUT
2V/div
VEN
5V/div
500µs/div
CL = 1µF
TA = +25°C
RL =10Ω
VOUT
2V/div
500µs/div
CL = 1µF
TA = +25°C
RL =10Ω
Turn-Off Delay and Fall Time
500µs/div
CL = 1µF
TA = +25°C
RL =10Ω
AP2141A/ AP2151A
Document number: DS37615 Rev. 1 - 2
5 of 17
www.diodes.com
March 2015
© Diodes Incorporated
5 Page 
AP2141A/ AP2151A
Application Information (continued)
Thermal Protection
Thermal protection prevents the IC from damage when heavy-overload or short-circuit faults are present for extended periods of time. The
AP2141A/AP2151A 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 where it is not possible to turn off the power switch before input power is removed.
Host/Self-Powered HUBs
Hosts and self-powered hubs (SPH) have a local power supply that powers the embedded functions and the downstream ports (see Figure 2). This
power supply must provide from 5.25V to 4.75V to the board side of the downstream connection under both full-load and no-load conditions. Hosts
and SPHs are required to have current-limit protection and must report over-current conditions to the USB controller. Typical SPHs are desktop
PCs, monitors, printers, and stand-alone hubs.
Figure 2. Typical One-Port USB Host / Self-Powered Hub
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 AP2141A/AP2151A, 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 AP2141A/AP2151A 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 AP2141A/AP2151A 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.
Dual-Purpose Port Applications
AP2141A/AP2151A is suitable for use in dual-purpose port applications in which a single port is used for data communication between the host and
peripheral devices while simultaneously maintaining a charge to the battery of the peripheral device. An example of this is a shared HDMI/MHL
(Mobile High-definition Link) port that allows streaming video between an HDTV or set-top box and a smartphone or tablet while maintaining a
charge to the smartphone or tablet battery. In such dual-purpose port applications, it is important to insure Vin of the AP2141A/AP2151A is ramped
to its operating voltage prior to enabling the output.
AP2141A/ AP2151A
Document number: DS37615 Rev. 1 - 2
11 of 17
www.diodes.com
March 2015
© Diodes Incorporated
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet AP2151A.PDF ] | |
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