參數資料
型號： LTC3708
廠商： Linear Technology Corporation
英文描述： No RSENSE Low EMI, Synchronous DC/DC Controller with Output Tracking
中文描述： 無檢測電阻低EMI，同步DC / DC控制器的輸出跟蹤
文件頁數： 1/28頁
文件大小： 372K
代理商： LTC3708
1
LTC3808
3808f
No R
SENSE
TM
, Low EMI,
Synchronous DC/DC Controller
with Output Tracking
DESCRIPTIOU
The LTC
3808 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
V
DS
sensing eliminates the need for a current sense
resistor and improves efficiency.
Burst Mode operation provides high efficiency operation
at light loads. 100% duty cycle provides low dropout
operation, 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. For noise sensitive applications, the LTC3808
can be externally 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 LTC3808 incorpo-
rates a novel spread spectrum frequency modulation
technique.
The LTC3808 is available in the tiny footprint thermally
enhanced DFN package or 16-lead SSOP package.
, LTC and LT are registered trademarks of Linear Technology Corporation. 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.
■
Programmable Output Voltage Tracking
■
Sense Resistor Optional
■
Spread Spectrum Modulation for Low Noise
■
Constant Frequency Current Mode Operation for
Excellent Line and Load Transient Response
■
Wide V
IN
Range: 2.75V to 9.8V
■
Wide V
OUT
Range: 0.6V to V
IN
■
0.6V
±
1.5% Reference
■
Low Dropout Operation: 100% Duty Cycle
■
True PLL for Frequency Locking or Adjustment
(Frequency Range: 250kHz to 750kHz)
■
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: I
Q
= 9
μ
A
■
Tiny Thermally Enhanced Leadless (4mm
×
3mm)
DFN or 16-lead SSOP Package
APPLICATIU
■
One or Two Cell Lithium-Ion Powered Devices
■
Notebook and Palmtop Computers, PDAs
■
Portable Instruments
■
Distributed DC Power Systems
High Efficiency, 550kHz Step-Down Converter
FEATURES
TYPICAL APPLICATIO
U
+
LTC3808
2.2
μ
H
10
μ
F
V
2.75V TO 9.8V
V
2.5V
2A
47
μ
F
3808 TA01
15k
59k
1M
187k
220pF
GND
PLLLPF
SYNC/MODE
PGOOD
V
FB
I
TH
RUN
SW
V
IN
SENSE
+
TG
BG
IPRG
Efficiency and Power Loss vs Load Current
100
EFFICIENCY
LOAD CURRENT (mA)
E
90
80
70
60
50
P
10k
1k
100
10
1
0.1
1
100
1k
10k
3808 TA01b
10
V
IN
= 3.3V
V
IN
= 5V
V
IN
= 4.2V
FIGURE 11 CIRCUIT
V
OUT
= 2.5V
TYPICAL POWER
LOSS (V
IN
= 4.2V)
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相關代理商/技術參數
參數描述
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LTC3708EUHPBF 制造商:Linear Technology 功能描述:LTC3708 dual SD tracking PS controller
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