AAT1275 Boost Converter Datasheet
|Total Page||19 Pages|
Boost Converter with USB Power Switch
The AAT1275 SwitchReg is a 2MHz, 500mA syn-
chronous boost converter with an integrated current-
limiting load switch controlled output. The AAT1275
operates from a single-cell Lithium-ion/ polymer bat-
tery source and provides a regulated 5V, current
limit controlled output to support USB port VBUS
applications in portable consumer electronic prod-
ucts. The AAT1275 can support both USB 2.0 host
port and USB on-the-go operation, as well as gen-
eral purpose applications where a 5V supply with a
user programmable current limit is needed.
The high efficiency boost converter section of the
AAT1275 is typically set for a 5V output and can
deliver up to 500mA load current to support USB
VBUS operation from an input supply as low as
2.7V. The high boost converter switching frequen-
cy (up to 2.0MHz) provides fast load transient and
allows the use of small external components. Fully
integrated control circuitry simplifies system design
and reduces total solution size.
The integrated, programmable current limiting load
switch provides USB port protection for portable
devices allowing the AAT1275 to supply a 5V USB
VBUS up to 500mA. The load switch provides an
active low fault flag to alert the system in the event
of an over-current condition applied to the
The AAT1275 is available in the Pb-free, space-
saving 12-pin TSOPJW and 16-pin TDFN34 pack-
ages and is rated over the -40°C to +85°C operat-
ing temperature range.
• High Frequency Boost With 5V / 500mA
Output Capability From a Single-Cell Lithium-
• Input Voltage Range: 2.7V to 5V
• VOUT1 Adjustable or Fixed (5V)
• >90% Efficiency
• Up to 2MHz Switching Frequency
• True Load Disconnect
• Load Switch With Programmable Current Limit
• Over-Temperature, Over-Current Protection
• Inrush Current Limit
• Fault Report
• Low Shutdown Current < 1µA Typical
• -40°C to +85°C Temperature Range
• TSOPJW-12 and TDFN34-16 Packages
• USB On-the-Go
• Cell Phones
• Digital Still Cameras
• PDAs and Portable Media Players
• Smart Phones
• Other Hand-Held Devices
Boost Converter with USB Power Switch
1 1, 16
2 3, 15
3 13, 14
4 11, 12
Switched power input. Connect an inductor between this pin and the SW pin.
Switch pin. Boost inductor is connected between SW and LIN.
Boost converter output.
Load switch output.
Load switch current limit programming pin. Connect a set resistor between
this pin and ground.
Load switch over-current or over-temperature fault flag. Active low, open-
drain output. A 10kΩ external pull-up resistor is recommended.
Boost converter voltage feedback pin.
Bias supply for the internal circuitry.
Enable pin, active high.
Exposed paddle (bottom); connect to ground directly beneath the package.
|Features||Boost Converter with USB Power Switch Ge neral Description The AAT1275 SwitchReg is a 2MHz, 500mA synchronous boost con verter with an integrated currentlimiti ng load switch controlled output. The A AT1275 operates from a single-cell Lith ium-ion/ polymer battery source and pro vides a regulated 5V, current limit con trolled output to support USB port VBUS applications in portable consumer elec tronic products. The AAT1275 can suppor t both USB 2.0 host port and USB on-the -go operation, as well as general purpo se applications where a 5V supply with a user programmable current limit is ne eded. The high efficiency boost convert er section of the AAT1275 is typically set for a 5V output and can deliver up to 500mA load current to support USB VB US operation from an input supply as lo w as 2.7V. The high boost converter swi tching frequency (up to 2.0MHz) provide s fast load transient and allows the us e of small external components. Fully i ntegrated control circuitry simplifies system design and reduce.|
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