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LTC3406B-2 Datasheet

  • LTC3406B-2

  • 2.25MHz, 600mA Synchronous Step-Down Regulator in ThinSOT

  • 213.71KB

  • 16頁(yè)

  • LINER

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LTC3406B-2
2.25MHz, 600mA
Synchronous Step-Down
Regulator in ThinSOT
TM
FEATURES
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DESCRIPTIO
High Efficiency: Up to 96%
600mA Output Current at V
IN
= 3V
2.5V to 5.5V Input Voltage Range
2.25MHz Constant Frequency Operation
No Schottky Diode Required
Low Dropout Operation: 100% Duty Cycle
Low Quiescent Current: 350碌A(chǔ)
0.6V Reference Allows Low Output Voltages
Shutdown Mode Draws < 1碌A(chǔ) Supply Current
Current Mode Operation for Excellent Line and
Load Transient Response
Overtemperature Protected
Low Profile (1mm) SOT-23 Package
The LTC
廬
3406B-2 is a high efficiency monolithic synchro-
nous buck regulator using a constant frequency, current
mode architecture. Supply current with no load is 350碌A(chǔ),
dropping to <1碌A(chǔ) in shutdown. The 2.5V to 5.5V input
voltage range makes the LTC3406B-2 ideally suited for
single Li-Ion battery-powered applications. 100% duty
cycle capability provides low dropout operation, extend-
ing battery life in portable systems. PWM pulse skipping
mode operation provides very low output ripple voltage for
noise sensitive applications.
The switching frequency is internally set at 2.25MHz, allow-
ing the use of tiny surface mount inductors and capacitors.
The internal synchronous switch increases efficiency and
eliminates the need for an external Schottky diode. Low
output voltages are easily supported with the 0.6V feedback
reference voltage. The LTC3406B-2 is available in a low pro-
file (1mm) SOT-23 package. Refer to LTC3406 for appli-
cations that require Burst Mode
廬
operation.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
Protected by U.S. Patents, including 6580258, 5481178.
APPLICATIO S
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Cellular Telephones
Personal Information Appliances
Wireless and DSL Modems
Digital Still Cameras
MP3 Players
Portable Instruments
TYPICAL APPLICATIO
High Efficiency Step-Down Converter
100
V
IN
2.7V
TO 5.5V
2.2碌H*
V
IN
4.7碌F
CER
SW
22pF
1M
10碌F
CER
V
OUT
1.8V
600mA
90
80
V
OUT
= 1.8V
T
A
= 25擄C
LTC3406B-2
RUN
GND
V
FB
EFFICIENCY (%)
70
60
50
40
30
20
10
0.1
V
IN
= 4.2V
1
100
10
OUTPUT CURRENT (mA)
1000
3406B TA01b
499k
3406B TA01a
U
Efficiency vs Load Current
V
IN
= 3.6V
V
IN
= 2.7V
sn3406b2 3406b2fs
U
U
1

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