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LTC3708 Datasheet

  • LTC3708

  • No RSENSE Low EMI, Synchronous DC/DC Controller with Output ...

  • 28頁

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LTC3808
No R
SENSE
TM
, Low EMI,
Synchronous DC/DC Controller
with Output Tracking
DESCRIPTIO
The LTC
廬
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.
FEATURES
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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
鹵1.5%
Reference
Low Dropout Operation: 100% Duty Cycle
True PLL for Frequency Locking or Adjustment
(Frequency Range: 250kHz to 750kHz)
Selectable Burst Mode
廬
/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碌A(chǔ)
Tiny Thermally Enhanced Leadless (4mm
脳
3mm)
DFN or 16-lead SSOP Package
APPLICATIO S
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One or Two Cell Lithium-Ion Powered Devices
Notebook and Palmtop Computers, PDAs
Portable Instruments
Distributed DC Power Systems
TYPICAL APPLICATIO
1M
LTC3808
PLLLPF
Efficiency and Power Loss vs Load Current
100
10k
EFFICIENCY
V
IN
= 3.3V
V
IN
= 5V
80
TYPICAL POWER
LOSS (V
IN
= 4.2V)
V
IN
= 4.2V
100
High Efficiency, 550kHz Step-Down Converter
V
IN
2.75V TO 9.8V
V
IN
SENSE
+
TG
2.2碌H
SW
BG
IPRG
GND
3808 TA01
90
SYNC/MODE
59k
15k
187k
220pF
PGOOD
V
FB
I
TH
RUN
EFFICIENCY (%)
10碌F
+
47碌F
V
OUT
2.5V
2A
70
60
FIGURE 11 CIRCUIT
V
OUT
= 2.5V
1
10
100
1k
LOAD CURRENT (mA)
50
U
U
U
1k
POWER LOSS (mW)
10
1
0.1
10k
3808 TA01b
3808f
1

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