參數(shù)資料
型號(hào)： LT3681EDE#TR
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 4.4 A SWITCHING REGULATOR, 3100 kHz SWITCHING FREQ-MAX, PDSO14
封裝： 4 X 3 MM, PLASTIC, DFN-14
文件頁(yè)數(shù)： 1/24頁(yè)
文件大?。?/td> 367K
代理商： LT3681EDE#TR
LT3681
1
3681f
36V, 2A, 2.8MHz Step-Down
Switching Regulator with
Integrated Power Schottky Diode
The LT3681 is an adjustable frequency (300kHz to 2.8MHz)
monolithic buck switching regulator that accepts input
voltages up to 34V (36V maximum). A high efciency
0.18
Ω switch is included on the die along with a boost
Schottky diode and the necessary oscillator, control, and
logic circuitry. An undedicated power Schottky diode is
integrated into the LT3681 to minimize the solution size.
Current mode topology is used for fast transient response
and good loop stability. Low ripple Burst Mode operation
maintains high efciency at low output currents while
keeping output ripple below 15mV in a typical application.
In addition, the LT3681 can further enhance low output
current efciency by drawing bias current from the output
when VOUT is above 3V. Shutdown reduces input supply
current to less than 1A while a resistor and capacitor on
the RUN/SS pin provide a controlled output voltage ramp
(soft-start). A power good ag signals when VOUT reaches
90% of the programmed output voltage. The LT3681
is available in 14-Pin 4mm x 3mm DFN package with
exposed pads for low thermal resistance.
■ Automotive Battery Regulation
■ Power for Portable Products
■ Distributed Supply Regulation
■ Industrial Supplies
■ Wall Transformer Regulation
■ Wide Input Voltage Range: 3.6V to 34V Operating,
36V Maximum
■ 2A Maximum Output Current
■ Low Ripple Burst Mode Operation
50A IQ at 12VIN to 3.3VOUT
Output Ripple < 15mVP-P
■ Adjustable Switching Frequency: 300kHz to 2.8MHz
■ Low Shutdown Current: IQ < 1A
■ Integrated Boost Diode
■ Integrated Power Schottky Diode
■ Power Good Flag
■ Saturating Switch Design: 0.18
Ω On-Resistance
■ 1.265V Feedback Reference Voltage
■ Output Voltage: 1.265V to 20V
■ Soft-Start Capability
■ Small 14-Pin Thermally Enhanced
(4mm x 3mm) DFN Package
5V Step-Down Converter
APPLICATIO S
U
FEATURES
DESCRIPTIO
U
TYPICAL APPLICATIO
U
SW
DC
DA
BIAS
FB
VC
PG
RT
VIN
BD
VIN
6.3V TO
34V
VOUT
5V
2A
4.7
mF
0.47
mF
330pF
22
mF
200k
20k
60.4k
L
6.8
mH
590k
GND
OFF ON
LT3681
3681 TA01
RUN/SS
BOOST
L: NEC PLC-0745-6R8
Efciency
ILOAD (A)
0.0001
EFFICIENCY
(%)
POWER
LOSS
(W)
10
20
0
0.001
0.01
0.1
1
10
3681 TA01b
40
30
100
90
80
60
70
50
0.0001
0.0100
0.0010
10.0000
1.0000
0.1000
VIN = 12V
VOUT = 3.3V
L = 4.7
mH
F = 800 kHz
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
相關(guān)PDF資料
PDF描述
LT3681EDE 4.4 A SWITCHING REGULATOR, 3100 kHz SWITCHING FREQ-MAX, PDSO14
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