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LM3281YFQR bảng dữ liệu(PDF) 1 Page - Texas Instruments

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tên linh kiện LM3281YFQR
Giải thích chi tiết về linh kiện  3.3-V, 1.2-A, 6-MHz Miniature Step-Down DC-DC Converter
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LM3281YFQR bảng dữ liệu(HTML) 1 Page - Texas Instruments

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FB
EN
VIN
SW
VIN
3 V - 5.5 V
CIN
2.2 µF
COUT
2.2 µF
GND
LSW
0.47 µH
LM3281
VOUT
3.3 V
GPO1
MODE
VIN_c
VIN_b
VIN_a
CLOAD2
4.7 µF
CLOAD1
10 µF
GPO2
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LM3281
SNVSA38 – NOVEMBER 2014
LM3281 3.3-V, 1.2-A, 6-MHz Miniature Step-Down DC-DC Converter
for Wireless Connectivity Solutions
1 Features
3 Description
The LM3281 is a high-efficiency low-noise miniature
1
Operates from a Single Li-Ion Cell (3 V to 5.5 V)
DC-DC converter optimized for powering noise-
6-MHz (typ.) PWM Switching Frequency
sensitive wireless connectivity chipsets and RF Front
Fixed Output Voltage: 3.3 V
End Modules (FEMs) from a single Lithium-Ion cell.
The LM3281 is ideal for “always on” applications with
Up to 1.2-A Maximum Load Capability
very low unloaded quiescent current of 16 µA (typ.).
High Efficiency: 94% (typ.) with 3.8-V VIN at
300 mA
The LM3281 steps down an input supply voltage to a
fixed output voltage of 3.3 V with output current up to
Analog Bypass: 60-mV (typ.) Drop-Out at 600 mA
1200 mA. Five different modes of operation are used
Low IQ: 16 µA typical, 25 µA maximum
to optimize efficiency and minimize battery drain. In
Automatic ECO/PWM/Bypass Mode Change
Pulse Width Modulation (PWM) mode, the device
operates at a fixed frequency of 6 MHz which
Forced PWM Mode for Low Output-Voltage Ripple
minimizes RF interference when driving medium-to-
Soft-Start Limits Input Current on Start-Up
heavy loads. At light load, the device automatically
Current Overload Protection
enters into Economy (ECO) mode with reduced
quiescent current. In a low-battery voltage condition,
Thermal Overload Protection
a bypass mode reduces the voltage dropout to 60 mV
Small Total Solution Size: < 7.5 mm2
(typ.) at 600 mA. If very low output voltage ripple is
desired at light loads, the device can also be forced
2 Applications
into PWM mode. Shutdown mode turns the device off
WLAN, WiFi Station Devices
and reduces battery consumption to 0.1
μA (typ.).
WiFi RF PC Cards
Device Information(1)
Battery-Powered RF Devices
PART NUMBER
PACKAGE
BODY SIZE
LM3281
DSBGA (6)
1.465 mm x 1.190 (MAX)
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Simplified Schematic
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.


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