AAT1275 Datasheet PDF - AAT
Part Number | AAT1275 | |
Description | Boost Converter | |
Manufacturers | AAT | |
Logo | ||
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AAT1275
Boost Converter with USB Power Switch
General Description
Features
SwitchReg™
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
AAT1275 output.
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-
Ion/Polymer Battery
• 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
Applications
• USB On-the-Go
• Cell Phones
• Digital Still Cameras
• PDAs and Portable Media Players
• Smart Phones
• Other Hand-Held Devices
Typical Application
VIN
Fault
Enable
CIN
4.7µF
10k
RSET
L1 2.2µH
LIN
IN
SW
OUT1
VCC
FB
AAT1275
FLT
EN
SET
OUT2
GND
RFB1
432k
RFB2
59k
COUT1
4.7µF
COUT2
1µF
VBUS Output
1275.2007.01.1.3
1
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AAT1275
Boost Converter with USB Power Switch
Typical Characteristics
Efficiency vs. Load
100
80
60
40
20
0
0.1
VIN = 2.7V
VIN = 4.2V
VIN = 3.6V
1 10 100
Output Current (mA)
1000
1.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
0.1
DC Regulation
(VOUT = 5.0V)
VIN = 4.2V
VIN = 2.7V VIN = 3.6V
1 10 100
Output Current (mA)
1000
Line Regulation
(IOUT = 300mA)
4.960
4.958
4.956
4.954
4.952
4.950
4.948
4.946
4.944
4.942
4.940
3.6 3.7 3.8 3.9 4.0 4.1 4.2
Input Voltage (V)
Output Voltage vs. Temperature
(VIN = 3.6V; 50Ω Load)
0.1
0.0
-0.1
-0.2
-0.3
-0.4
-0.5
-0.6
-0.7
-50
-25
0
25 50 75
Temperature (°C)
100
No Load Current vs. Supply Voltage
140
120
85°C
100
80
60
-40°C
25°C
40
20
0
2.7 2.9 3.2 3.4 3.6 3.9 4.1 4.3 4.5 4.8 5.0
Supply Voltage (V)
No Load Current vs. Temperature
(VIN = 3.6V; VOUT = 5.0V)
140
120
100
80
60
40
20
0
-50
0
50 100
Temperature (°C)
150
1275.2007.01.1.3
5
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for AAT1275 electronic component. |
Information | Total 19 Pages | |
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