LTC3407EMSE-2 Linear Technology, LTC3407EMSE-2 Datasheet
LTC3407EMSE-2
Manufacturer Part Number
LTC3407EMSE-2
Description
IC,SMPS CONTROLLER,CURRENT-MODE,CMOS,TSSOP,10PIN,PLASTIC
Manufacturer
Linear Technology
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FEATURES
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APPLICATIO S
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TYPICAL APPLICATIO
3.3V TO 5.5V
Very Low Quiescent Current: Only 40µA
1.8V at 800mA/3.3V at 800mA
High Efficiency: Up to 95%
2.25MHz Constant Frequency Operation
High Switch Current: 1.2A on Each Channel
No Schottky Diodes Required
Low R
V
Current Mode Operation for Excellent Line
and Load Transient Response
Short-Circuit Protected
Low Dropout Operation: 100% Duty Cycle
Ultralow Shutdown Current: I
Power-On Reset Output
Externally Synchronizable Oscillator
Small Thermally Enhanced 3mm × 3mm DFN Package
PDAs/Palmtop PCs
Digital Cameras
Cellular Phones
Portable Media Players
PC Cards
Wireless and DSL Modems
IN
V
Figure 1. 1.8V/3.3V at 800mA Step-Down Regulators
: 3.3V to 5.5V
OUT2
3.3V
V
IN
DS(ON)
NOTE: IN DROPOUT, THE OUTPUT TRACKS THE INPUT VOLTAGE
10µF
10µF
2.2µH
Internal Switches: 0.35Ω
U
MODE/SYNC
SW2
V
RUN2
OUT2
LTC3407-3
GND
V
IN
Q
RUN1
< 1µA
U
V
SW1
POR
OUT1
2.25MHz Step-Down DC/DC Regulator
100k
2.2µH
RESET
34073 TA01
10µF
V
1.8V
OUT1
DESCRIPTIO
The LTC
nous step down DC/DC converter. Intended for low power
applications, it operates from 3.3V 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 ≤1.0mm. Internal synchronous 0.35Ω, 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
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
40µA. In shutdown, the device draws <1µA.
Burst Mode is a registered trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 5481178, 6580258, 6304066, 6127815, 6498466,
6611131.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
1.8V/0.8A and 3.3V/0.8A
®
operation provides high efficiency at light loads,
®
3407-3 is a dual, constant frequency, synchro-
100
90
80
70
60
50
40
30
20
10
1
LTC3407-3 Efficiency/Power Loss
V
Dual Synchronous,
OUT
V
V
OUT
OUT
U
= 3.3V
LOAD CURRENT (mA)
V
Burst Mode OPERATION
NO LOAD ON OTHER CHANNEL
10
= 3.3V
= 1.8V
IN
= 5V
V
OUT
= 1.8V
100
LTC3407-3
34073 TA01b
1000
1
0.1
0.01
0.001
0.000
34073fa
1
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