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參數(shù)資料
| 型號： | LTC3809EMS#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, 825 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | PLASTIC, MSOP-10 |
| 文件頁數(shù)： | 1/24頁 |
| 文件大?。?/td> | 266K |
| 代理商： | LTC3809EMS#PBF |
1
LTC3809
3809f
No RSENSE
TM, Low EMI,
Synchronous DC/DC Controller
■
No Current Sense Resistor Required
■ Selectable Spread Spectrum Frequency Modulation
for Low Noise Operation
■
Constant Frequency Current Mode Operation for
Excellent Line and Load Transient Response
■ True PLL for Frequency Locking or Adjustment
(Frequency Range: 250kHz to 750kHz)
■ Wide VIN Range: 2.75V to 9.8V
■ Wide VOUT Range: 0.6V to VIN
■
0.6V
±1.5% Reference
■ Low Dropout Operation: 100% Duty Cycle
■ Selectable Burst Mode
/Pulse Skipping/Forced
Continuous Operation
■ Auxiliary Winding Regulation
■ Internal Soft-Start Circuitry
■
Power Good Output Voltage Monitor
■ Output Overvoltage Protection
■ Micropower Shutdown: IQ = 9A
■
Tiny Thermally Enhanced Leadless (3mm
× 3mm)
DFN and 10-lead MSOP Packages
■ One or Two Lithium-Ion Powered Devices
■ Portable Instruments
■ Distributed DC Power Systems
, LTC and LT are registered trademarks of Linear Technology Corporation.
High Efficiency, 550kHz Step-Down Converter
DESCRIPTIO
U
FEATURES
APPLICATIO S
U
TYPICAL APPLICATIO
U
LTC3809
2.2
H
10
F
VIN
2.75V TO 9.8V
VOUT
2.5V
2A
47
F
3809 TA01
15k
59k
187k
470pF
GND
PLLLPF
SYNC/MODE
VFB
ITH
RUN
SW
VIN
TG
BG
IPRG
The LTC
3809 is a synchronous step-down switching
regulator controller that drives external complementary
power MOSFETs using few external components. The
constant frequency current mode architecture with MOSFET
VDS sensing eliminates the need for a current sense
resistor and improves efficiency.
For noise sensitive applications, the LTC3809 can be ex-
ternally synchronized from 250kHz to 750kHz. Burst Mode
is inhibited during synchronization or when the SYNC/
MODE pin is pulled low to reduce noise and RF interference.
To further reduce EMI, the LTC3809 incorporates a novel
spread spectrum frequency modulation technique.
Burst Mode operation provides high efficiency operation at
light loads. 100% duty cycle provides low dropout opera-
tion, extending operating time in battery-powered systems.
The switching frequency can be programmed up to 750kHz,
allowing the use of small surface mount inductors and
capacitors.
The LTC3809 is available in the tiny footprint thermally
enhanced DFN and 10-lead MSOP packages.
Burst Mode is a registered trademark of Linear Technology Corporation.
No RSENSE is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 5481178, 5929620, 6580258, 6304066, 5847554,
6611131, 6498466. Other Patents pending.
Efficiency and Power Loss vs Load Current
LOAD CURRENT (mA)
EFFICIENCY
(%)
100
90
80
70
60
50
POWER
LOSS
(mW)
10k
1k
100
10
1
0.1
1
100
1000
10000
3809 TA01b
10
VIN = 3.3V
VIN = 5V
VIN = 4.2V
FIGURE 10 CIRCUIT
VOUT = 2.5V
POWER LOSS
VIN = 4.2V
EFFICIENCY
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PDF描述 |
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| LTC3809EMS | 1 A SWITCHING CONTROLLER, 825 kHz SWITCHING FREQ-MAX, PDSO10 |
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| LTC3816EFE#PBF | SWITCHING CONTROLLER, PDSO38 |
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