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PDF A4770 Data sheet ( Hoja de datos )
| Número de pieza | A4770 | |
| Descripción | POWER SWITCH | |
| Fabricantes | AiT Semiconductor | |
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AiT Semiconductor Inc.
www.ait-ic.com
A4770
POWER SWITCH
100mΩ POWER DISTRIBUTION
DESCRIPTION
The A4770 is an integrated 100mΩ power switch
for self-powered and bus-powered Universal Series
Bus (USB) applications. A built-in charge pump is
used to drive the N-channel NMOSFET that is free
of parasitic body diode to eliminate any reversed
current flow across the switch when it is powered
off. Its low quiescent supply current (23μA) and
small package (SOT-25) is particularly suitable in
battery-powered portable equipment.
FEATURES
100mΩ Typ. High-Side NMOSFET (SOT-25)
Guaranteed 1.1A Continuous Current
1.5A Current Limit
Small SOT-25 Package Minimizes Board Space
Soft Start
Thermal Protection
Low 23uA Supply Current
Wide Input Voltage Range: 2.2V ~ 6V
Available in SOT-25 Package
Several protection functions include soft start to
limit inrush current during plug-in, current limiting at
1.5A to meet USB power requirement, and thermal
shutdown to protect damage under over current
conditions.
The A4770 is available in SOT-25 package.
APPLICATION
Battery-Powered Equipment
Motherboard USB Power Switch
USB Device Power Switch
Hot-Plug Power Supplies
Battery-Charger Circuits
ORDERING INFORMATION
TYPICAL APPLICATION
Package Type
Part Number
SOT-25
A4770E5R
E5
A4770E5VR
Note
R: Tape & Reel,
V: Green Package
AiT provides all Pb free products
Suffix “ V “ means Green Package
REV1.0
- JUL 2011 RELEASED -
-1-
1 page  
AiT Semiconductor Inc.
www.ait-ic.com
A4770
POWER SWITCH
100mΩ POWER DISTRIBUTION
TYPICAL PERFORMANCE CHARACTERISTICS
1. Supply Current vs. Temperature
2. Supply Current vs. Voltage
3. On-Resistance vs. Temperature
4. On-Resistance vs. Voltage
5. Current Limit vs. Temperature
6. Current Limit vs. Voltage
REV1.0
- JUL 2011 RELEASED -
-5-
5 Page 
AiT Semiconductor Inc.
www.ait-ic.com
A4770
POWER SWITCH
100mΩ POWER DISTRIBUTION
DETAILED INFORMATION
The A4770 is a high-side single N-channel switch with active-high enable input.
Input and Output
VIN (input) is the power supply connection to the circuitry and the drain of the output MOSFET. VOUT (output) is
the source of the output MOSFET. In a typical circuit, current flows through the switch from VIN to VOUT toward
the load. Both VOUT pins must be short on the board and connected to the load and so do both VIN pins but
connected to the power source.
Thermal Shutdown
Thermal shutdown shuts off the output MOSFET if the die temperature exceeds 130°C and 20°C of hysteresis
forces the switch turning off until the die temperature drops to 110°C.
Soft Start
In order to eliminate the upstream voltage droop caused by the large inrush current during hot-plug events,
the “soft-start” feature effectively isolates power supplies from such highly capacitive loads.
Under-voltage Lockout
UVLO prevents the MOSFET switch from turning on until input voltage exceeds 1.8V (typical). If input voltage
drops below 1.8V (typical), UVLO shuts off the MOSFET switch.
Current Limiting and Short Protection
The current limit circuit is designed to protect the system supply, the MOSFET switch and the load from
damage caused by excessive currents. The current limit threshold is set internally to allow a minimum of 1.1A
through the MOSFET but limits the output current to approximately 1.5A typical. When the output is short to
ground, it will limit to a constant current 1A until thermal shutdown or short condition removed.
REV1.0
- JUL 2011 RELEASED -
- 11 -
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet A4770.PDF ] | |
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