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LTC3407EMSE-2 Datasheet

  • LTC3407EMSE-2

  • Dual Synchronous, 800mA, 2.25MHz Step-Down DC/DC Regulator

  • 16頁(yè)

  • LINER

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LTC3407-2
Dual Synchronous, 800mA,
2.25MHz Step-Down
DC/DC Regulator
FEATURES
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DESCRIPTIO
High Efficiency: Up to 95%
Very Low Quiescent Current: Only 40碌A(chǔ)
2.25MHz Constant Frequency Operation
High Switch Current: 1.2A on Each Channel
No Schottky Diodes Required
Low R
DS(ON)
Internal Switches: 0.35鈩?/div>
Current Mode Operation for Excellent Line
and Load Transient Response
Short-Circuit Protected
Low Dropout Operation: 100% Duty Cycle
Ultralow Shutdown Current: I
Q
< 1碌A(chǔ)
Output Voltages from 5V down to 0.6V
Power-On Reset Output
Externally Synchronizable Oscillator
Small Thermally Enhanced MSOP and 3mm
脳
3mm
DFN Packages
The LTC
廬
3407-2 is a dual, constant frequency, synchro-
nous step down DC/DC converter. Intended for low power
applications, it operates from 2.5V to 5.5V input voltage
range and has a constant 2.25MHz switching frequency,
allowing the use of tiny, low cost capacitors and inductors
with a profile
鈮?.2mm.
Each output voltage is adjustable
from 0.6V to 5V. Internal synchronous 0.35鈩? 1.2A power
switches provide high efficiency without the need for
external Schottky diodes.
A user selectable mode input is provided to allow the user
to trade-off noise ripple for low power efficiency. Burst
Mode
廬
operation provides high efficiency at light loads,
while Pulse Skip Mode provides low noise ripple at light
loads.
To further maximize battery life, the P-channel MOSFETs
are turned on continuously in dropout (100% duty cycle),
and both channels draw a total quiescent current of only
40碌A(chǔ). In shutdown, the device draws <1碌A(chǔ).
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
APPLICATIO S
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PDAs/Palmtop PCs
Digital Cameras
Cellular Phones
Portable Media Players
PC Cards
Wireless and DSL Modems
TYPICAL APPLICATIO
V
IN
= 2.5V*
TO 5.5V
C1
10碌F
RUN2
V
IN
RUN1
POR
R5
100k
RESET
EFFICIENCY (%)
MODE/SYNC
L2
2.2碌H
SW2
C5, 22pF
LTC3407-2
V
OUT2
= 2.5V
AT 800mA
L1
2.2碌H
SW1
C4, 22pF
V
OUT1
= 1.8V
AT 800mA
C3
10碌F
R4
887k
V
FB2
R3
280k
GND
V
FB1
R1
301k
R2
604k
C2
10碌F
C1, C2, C3: TAIYO YUDEN JMK316BJ106ML
L1, L2: MURATA LQH32CN2R2M33
*V
OUT
CONNECTED TO V
IN
FOR V
IN
鈮?/div>
2.8V
3407 TA01
Figure 1. 2.5V/1.8V at 800mA Step-Down Regulators
sn34072 34072fs
U
LTC3407-2 Efficiency Curve
100
95
90
85
80
75
70
65
60
1
V
IN
= 3.3V
Burst Mode OPERATION
NO LOAD ON OTHER CHANNEL
10
100
LOAD CURRENT (mA)
1000
3407 TA02
U
U
2.5V
1.8V
1

LTC3407EMSE-2 產(chǎn)品屬性

  • 0現(xiàn)貨

  • 停產(chǎn)

  • -

  • 管件

  • 停產(chǎn)

  • 降壓

  • 正

  • 可調(diào)式

  • 2

  • 2.5V

  • 5.5V

  • 0.6V

  • 5V

  • 800mA，800mA

  • 2.25MHz

  • 是

  • -40°C ~ 85°C（TA）

  • 表面貼裝型

  • 10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤

  • 10-MSOP-EP

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