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LTC3407EDD-4#TR

Description
Switching Voltage Regulators LTC3407-4 - Dual Synchronous, 800mA, 2.25MHz Step-Down DC/DC Regulator
CategoryPower/power management    The power supply circuit   
File Size261KB,16 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Parametric View All

LTC3407EDD-4#TR Overview

Switching Voltage Regulators LTC3407-4 - Dual Synchronous, 800mA, 2.25MHz Step-Down DC/DC Regulator

LTC3407EDD-4#TR Parametric

Parameter NameAttribute value
Is it Rohs certified?incompatible
MakerADI
package instructionHVSON,
Reach Compliance Codenot_compliant
ECCN codeEAR99
Analog Integrated Circuits - Other TypesDUAL SWITCHING CONTROLLER
control modeCURRENT-MODE
Maximum input voltage5.5 V
Minimum input voltage2.5 V
Nominal input voltage3.6 V
JESD-30 codeS-PDSO-N10
JESD-609 codee0
length3 mm
Humidity sensitivity level1
Number of functions1
Number of terminals10
Maximum operating temperature85 °C
Minimum operating temperature
Maximum output current1.6 A
Package body materialPLASTIC/EPOXY
encapsulated codeHVSON
Package shapeSQUARE
Package formSMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE
Peak Reflow Temperature (Celsius)235
Certification statusNot Qualified
Maximum seat height0.8 mm
surface mountYES
Switch configurationBUCK
Maximum switching frequency2700 kHz
Temperature levelCOMMERCIAL EXTENDED
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formNO LEAD
Terminal pitch0.5 mm
Terminal locationDUAL
Maximum time at peak reflow temperature20
width3 mm
FEATURES
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LTC3407-4
Dual Synchronous, 800mA,
2.25MHz Step-Down
DC/DC Regulator
DESCRIPTION
The LTC
®
3407-4 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 induc-
tors with a profile ≤1mm. Each output voltage is adjust-
able from 0.6V to 5V. 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
®
operation provides high efficiency at light loads,
while pulse-skipping 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.
The LTC3407-4 is identical to the LTC3407-2 except for
the reduced power-on reset delay time.
L,
LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
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.
High Efficiency: Up to 95%
Very Low Quiescent Current: Only 40μA
2.25MHz Constant Frequency Operation
High Switch Current: 1.2A on Each Channel
No Schottky Diodes Required
Low R
DS(ON)
Internal Switches: 0.35Ω
Current Mode Operation for Excellent Line
and Load Transient Response
Short-Circuit Protected
Low Dropout Operation: 100% Duty Cycle
Ultralow Shutdown Current: I
Q
< 1μA
Output Voltages from 5V down to 0.6V
Power-On Reset Output
Externally Synchronizable Oscillator
Small Thermally Enhanced MSOP and 3mm
×
3mm
DFN Packages
APPLICATIONS
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PDAs/Palmtop PCs
Digital Cameras
Cellular Phones
Portable Media Players
PC Cards
Wireless and DSL Modems
TYPICAL APPLICATION
V
IN
*
2.5V TO 5.5V
LTC3407-4 Efficiency/Power Loss Curve
C1
10μF
L2
2.2μH
SW2
C5, 22pF
RUN2
V
IN
RUN1
POR
L1
2.2μH
SW1
C4, 22pF
R5
100k
RESET
EFFICIENCY (%)
V
OUT1
1.8V
800mA
100
90
80
70
60
50
40
30
C2
10μF
20
10
0.01
0.1
POWER LOSS (W)
1
MODE/SYNC
V
OUT2
2.5V
800mA
LTC3407-4
C3
10μF
R4
887k
V
FB2
R3
280k
GND
V
FB1
R2
R1 604k
301k
0.001
C1, C2, C3: TAIYO YUDEN JMK316BJ106ML
L1, L2: MURATA LQH32CN2R2M33
*V
OUT
CONNECTED TO V
IN
FOR V
IN
2.8V
3407 TA01
0
0.1
1
10
100
LOAD CURRENT (mA)
0.0001
1000
34074 TA02
Figure 1. 2.5V/1.8V at 800mA Step-Down Regulators
34074fa
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