|
|
PDF AP22802 Data sheet ( Hoja de datos )
| Número de pieza | AP22802 | |
| Descripción | SINGLE CHANNEL POWER DISTRIBUTION LOAD SWITCH | |
| Fabricantes | Diodes | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de AP22802 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
|
No Preview Available !
AP22802
SINGLE CHANNEL POWER DISTRIBUTION LOA9D65S0W1I0TCH
Description
The AP22802 is a single channel current-limited integrated high-side
power switch optimized for Universal Serial Bus (USB) and other
hot-swap applications. The family of devices complies with
USB standards and is available with both polarities of Enable input.
The device has fast short-circuit response time for improved overall
system robustness, and has an integrated output discharge function
to ensure completely controlled discharging of the output voltage
capacitor. They provide a complete protection solution for applications
subject to heavy capacitive loads and the prospect of short circuit,
and offer reverse current blocking, over-current, over-temperature
and short-circuit protection, as well as controlled rise time and
under-voltage lockout functionality. A 6ms deglitch capability on the
open-drain Flag output prevents false over-current reporting and does
not require any external components.
The AP22802 is available in a standard Green SOT25 and RoHS
compliant.
Features
Integrated Single Channel Load Switch
Protection
Over Current with Auto Recovery
Short Circuit with Auto Recovery
Over temperature with Auto Recovery
Small Form Factor Packages
SOT25
– footprint of just 9mm2
Thermally Efficient Low Profile Package
Totally Lead-Free & Fully RoHS compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
UL Recognized, File Number E322375
IEC60950-1 CB Scheme Certified
Pin Assignments
Top View
OUT 1
GND 2
FLG 3
5 IN
4 EN
SOT25
Applications
Integrated Load Switches in Ultrabook PC’s
Power Up/Down Sequencing in Ultrabook PC’s
Notebook
Netbook
Set-Top Boxes
SSD (Solid State Drives)
Consumer Electronics
Tablet PC
Telecom Systems
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.
Typical Applications Circuit
Enable Active High
Power Supply
2.7V to 5.5V
10k
IN
1uF
OUT
Load
0.1uF
120uF
FLG
ON
OFF
EN GND
AP22802
Document number: DS36218 Rev. 2 - 2
1 of 14
www.diodes.com
June 2014
© Diodes Incorporated
1 page  
AP22802
965010
Typical Performance Characteristics (cont.) (TA = +25°C, VIN = 5V, CIN = 1μF, CL = 0.1μF, unless otherwise specified.)
VOUT
2V/div
Turn on Delay and Rise Time
VIN=3.3V
RLOAD=10Ω
CL=4.7μF
VOUT
2V/div
Turn Off Delay and Fall Time
VIN=3.3V
RLOAD=10Ω
CL=4.7μF
EN
5V/div
EN
5V/div
IIN
200mA/div
IIN
200mA/div
1ms/div
400μs/div
VOUT
5V/div
Turn-On Delay and Rise Time
VIN=5V
RLOAD=2.5Ω
CL=120μF
EN
5V/div
VOUT
5V/div
EN
5V/div
Turn-Off Delay and Fall Time
VIN=5V
RLOAD=2.5Ω
CL=120μF
IIN
2A/div
1ms/div
Device Enabled Into Short-Circuit
VIN=5V
OUT grounded
IIN
2A/div
400μs/div
Inrush Current
VIN=5V
RLOAD=2.5Ω
EN
5V/div
EN
5V/div
IOUT
1A/div
1ms/div
AP22802
Document number: DS36218 Rev. 2 - 2
IIN
1A/div
5 of 14
www.diodes.com
CL=470μF
CL=220μF
CL=120μF
CL=1μF
1ms/div
June 2014
© Diodes Incorporated
5 Page 
AP22802
965010
Application Information
Power Supply Considerations
A 1-μF X7R or X5R ceramic bypass capacitor between IN and GND, close to the device, is recommended. Placing a high-value capacitor (10-μF
minimum) on both input and output pins is recommended when the output transient load is heavy. This precaution reduces power-supply
transients that may cause ringing on the input. Additionally, bypassing the output with a 0.01-μF to 0.1-μF ceramic capacitor improves the
immunity of the device to short-circuit transients.
FLG Response
When an over-current or over-temperature shutdown condition is encountered, the FLG open-drain output goes active low after a nominal 6-ms
deglitch timeout. The FLG output remains low until both over-current and over-temperature conditions are removed. Connecting a heavy
capacitive load to the output of the device can cause a momentary over-current condition, which does not trigger the FLG due to the 6-ms deglitch
timeout. The AP22802 is designed to eliminate false over-current reporting without the need of external components to remove unwanted pulses.
Over-Current and Short Circuit Protection
An internal sensing FET is employed to check for over-current conditions. Unlike current-sense resistors, sense FETs do not increase the series
resistance of the current path. When an overcurrent condition is detected, the device maintains a constant output current and reduces the output
voltage accordingly. Complete shutdown occurs only if the fault stays long enough to activate thermal limiting.
Three possible overload conditions can occur. In the first condition, the output has been shorted to GND before the device is enabled or before
VIN has been applied. The AP22802 senses the short circuit and immediately clamps output current to a certain safe level.
In the second condition, an output short or an overload occurs while the device is enabled. At the instance the overload occurs, higher current
may flow for a very short period of time before the current limit function can react. After the current limit function has tripped, the device switches
into current limiting mode and the current is clamped at ILIMIT, or ISHORT.
In the third condition, the load has been gradually increased beyond the recommended operating current. The current is permitted to rise until the
current-limit threshold (ITRIG) is reached or until the thermal limit of the device is exceeded. The AP22802 is capable of delivering current up to the
current-limit threshold without damaging the device. Once the threshold has been reached, the device switches into its current limiting mode and
is set at ILIMIT.
Thermal Protection
Thermal protection prevents the IC from damage when heavy-overload or short-circuit faults are present for extended periods of time. The
AP22802 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 15°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 6-ms deglitch.
ON/OFF Input Operator
The EN input allows the output current to be switched on and off using a GPIO compatible input. The high signal (switch on) should be at least
1.5V, and the low signal (switch off) no higher than 0.5V. This pin should NOT be left floating. It is advisable to hold the EN signal low when
applying or removing power.
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 2V, even
if the switch is enabled. Whenever the input voltage falls below approximately 2V, 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.
Discharge Function
The discharge function of the device is active when enable is disabled or de-asserted. The discharge function with the N-MOS power switch
implementation is activated and offers a resistive discharge path for the external storage capacitor. This is designed for discharging any residue of
the output voltage when either no external output resistance or load resistance is present at the output.
AP22802
Document number: DS36218 Rev. 2 - 2
11 of 14
www.diodes.com
June 2014
© Diodes Incorporated
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet AP22802.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| AP2280 | Single Channel Slew Rate Controlled Load Switch | Diodes |
| AP22800 | 5V SINGLE CHANNEL PROGRAMMABLE LOAD SWITCH | Diodes |
| AP22802 | SINGLE CHANNEL POWER DISTRIBUTION LOAD SWITCH | Diodes |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |