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PDF AN-SY6280 Data sheet ( Hoja de datos )
| Número de pieza | AN-SY6280 | |
| Descripción | Low Loss Power Distribution Switch | |
| Fabricantes | Silergy | |
| Logotipo |  |
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Application Note: AN_SY6280
Low Loss Power Distribution Switch
TARGET DESIGN SPECIFICATION
Preliminary Spec
General Description
The SY6280 develops ultra-low Rds(on) switch with
programmable current limiting to protect the power
source from over current and short circuit conditions. It
integrates the over temperature protection and
discharges the output capacitor during the shutdown. In
case the output is pulled higher than the input voltage
under the shutdown, the SY6280 can block the current
flowing from the output to the input.
Ordering Information
SY6280□(□□)□
Temperature Code
Package Code
Optional Spec Code
Temperature Range: -40°C to 85°C
Ordering Number Package type
SY6280AAC
SOT23-5
Note
----
Features
• Distribution voltages: 2.4V to 5.5V
• Programmable current limit
• Enable polarity: active high
• Over temperature shutdown and automatic retry
• Reverse blocking (no body diode)
• At shutdown, OUT can be forced higher than IN
• Automatic output discharge at shutdown
• Compact SOT23 packages minimize the board
space.
Applications
• USB 3G Datacard
• USB Dongle
• MiniPCI Accessories
Typical Applications
Figure 1. Schematic Diagram
AN_SY6280 Rev. 0.1 Silergy Corp. Confidential- Prepared for Customer Use Only
1
1 page  
AN_SY6280
Operation
The SY6280 is a current limited P-channel MOSFET
power switch designed for high-side load-switching
applications. There is no parasitic body diode between
drain and source of the MOSFET, so the SY6280
prevents current flow from out to input when out being
externally forced to a higher voltage than vin when
chip is disabled.
Over-current protection
When the over-current condition is sensed, the gate
of the pass switch is modulated to achieve constant
output current. Under output short circuit conditions,
the normal current limit folded back 50%. If the over
current condition presists for a long enough time, the
junction temperature may exceed 130C, and over-
temperature protection will shut down the part. Once
the chip temperature drops to 110C, the part will restart.
Supply Filter Capacitor
In order to prevent the input voltage drooping during
hot-plug events, a 10uF ceramic capacitor form VIN to
GND is strongly recommended. However, higher
capacitor values could reduce the voltage droop on the
input further. Furthermore, an output short will cause
ringing on the input without the input capacitor. It
could destroy the internal circuitry when the input
transient exceed 6V which is the absolute maximum
supply voltage even for a short duration.
Current Limiting Setting
Current limiting is programmable to protect the
power source from over current and short circuit
conditions. Connect a resistor RSET from this ISET pin
to GND to program the current limit:
Ilim (A)=6800 / Rset (ohm).
PCB Layout Guide
For best performance of the SY6280 , the following
guidelines must be strictly followed:
Keep all VBUS traces as short and wide as possible
and use at least 2 ounce copper for all VBUS traces.
Place a ground plane under all circuitry to lower
both resistance and inductance and improve DC
and transient performance.
Locate the output capacitor as close to the
connectors as possible to lower impedance(mainly
inductance) between the port and the capacitor
and improve transient performance.
Input and output capacitors should be placed
closed to the IC and connected to ground plane to
reduce noise coupling.
Locate the ceramic bypass capacitors as close as
possible to the VIN pins and VOUT pins of SY6280.
PCB Layout Guide(SOT23-5)
AN_SY6280 Rev. 0.1 Silergy Corp. Confidential- Prepared for Customer Use Only
5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet AN-SY6280.PDF ] | |
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