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Linear Technology Electronic Components Datasheet

LTC3407EMSE-2 Datasheet

2.25MHz Step-Down DC/DC Regulator

No Preview Available !

FEATURES
n High Efficiency: Up to 95%
n Very Low Quiescent Current: Only 40μA
n 2.25MHz Constant-Frequency Operation
n High Switch Current: 1.2A on Each Channel
n No Schottky Diodes Required
n Low RDS(ON) Internal Switches: 0.35Ω
n Current Mode Operation for Excellent Line
and Load Transient Response
n Short-Circuit Protected
n Low Dropout Operation: 100% Duty Cycle
n Ultralow Shutdown Current: IQ < 1μA
n Output Voltages from 5V down to 0.6V
n Power-On Reset Output
n Externally Synchronizable Oscillator
n Small Thermally Enhanced MSOP and 3mm × 3mm
DFN Packages
APPLICATIONS
n PDAs/Palmtop PCs
n Digital Cameras
n Cellular Phones
n Portable Media Players
n PC Cards
n Wireless and DSL Modems
LTC3407-2
Dual Synchronous, 800mA,
2.25MHz Step-Down
DC/DC Regulator
DESCRIPTION
The LTC®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 ≤1.2mm. Each output voltage is adjustable
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.
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.
TYPICAL APPLICATION
VIN = 2.5V*
TO 5.5V
C1
10μF
VOUT2 = 2.5V
AT 800mA
L2
2.2μH
C5, 22pF
RUN2 VIN RUN1
MODE/SYNC
POR
LTC3407-2
SW2
SW1
R5
100k
RESET
L1
2.2μH
C4, 22pF
C3
10μF
R4
887k R3
VFB2
GND
VFB1
R2
R1 604k
280k
301k
VOUT1 = 1.8V
AT 800mA
C2
10μF
C1, C2, C3: TAIYO YUDEN JMK316BJ106ML
L1, L2: MURATA LQH32CN2R2M33
*VOUT CONNECTED TO VIN FOR VIN b 2.8V
Figure 1. 2.5V/1.8V at 800mA Step-Down Regulators
3407 TA01
LTC3407-2 Efficiency Curve
100
95
2.5V
90
1.8V
85
80
75
70
65
VIN = 3.3V
Burst Mode OPERATION
NO LOAD ON OTHER CHANNEL
60
1
10
100
LOAD CURRENT (mA)
1000
3407 TA02
34072fc
1


Linear Technology Electronic Components Datasheet

LTC3407EMSE-2 Datasheet

2.25MHz Step-Down DC/DC Regulator

No Preview Available !

LTC3407-2
ABSOLUTE MAXIMUM RATINGS (Note 1)
VIN Voltages .................................................– 0.3V to 6V
VFB1, VFB2 Voltages .......................... –0.3V to VIN + 0.3V
RUN1, RUN2 Voltages .................................–0.3V to VIN
MODE/SYNC Voltage........................ –0.3V to VIN + 0.3V
SW1, SW2 Voltage........................... –0.3V to VIN + 0.3V
POR Voltage................................................. –0.3V to 6V
Ambient Operating Temperature Range (Note 2)
LTC3407E-2 ......................................... –40°C to 85°C
LTC3407I-2 ........................................ –40°C to 125°C
Junction Temperature (Note 5) ............................. 125°C
Storage Temperature Range...................– 65°C to 150°C
Lead Temperature (Soldering, 10 sec)
MSE Package Only............................................ 300°C
Reflow Peak Body Temperature ............................ 260°C
PIN CONFIGURATION
TOP VIEW
VFB1 1
RUN1 2
VIN 3
SW1 4
GND 5
10 VFB2
9 RUN2
11
8 POR
7 SW2
6 MODE/
SYNC
DD PACKAGE
10-LEAD (3mm s 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 45°C/W, θJC = 10°C/W
EXPOSED PAD (PIN 11) IS PGND, MUST BE CONNECTED TO GND
TOP VIEW
VFB1 1
10 VFB2
RUN1 2
9 RUN2
VIN 3
11
8 POR
SW1 4
7 SW2
GND 5
6 MODE/
SYNC
MSE PACKAGE
10-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 45°C/W, θJC = 10°C/W
EXPOSED PAD (PIN 11) IS PGND, MUST BE CONNECTED TO GND
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING* PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3407EDD-2#PBF
LTC3407EDD-2#TRPBF
LBFB
10-Lead (3mm × 3mm) Plastic DFN –40°C to 85°C
LTC3407IDD-2#PBF
LTC3407IDD-2#TRPBF
LBFB
10-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C
LTC3407EMSE-2#PBF
LTC3407EMSE-2#TRPBF LTBDZ
10-Lead Plastic MSOP
–40°C to 85°C
LTC3407IMSE-2#PBF
LTC3407IMSE-2#TRPBF
LTBDZ
10-Lead Plastic MSOP
–40°C to 125°C
LEAD BASED FINISH
TAPE AND REEL
PART MARKING* PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3407EDD-2
LTC3407EDD-2#TR
LBFB
10-Lead (3mm × 3mm) Plastic DFN –40°C to 85°C
LTC3407IDD-2
LTC3407IDD-2#TR
LBFB
10-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C
LTC3407EMSE-2
LTC3407EMSE-2#TR
LTBDZ
10-Lead Plastic MSOP
–40°C to 85°C
LTC3407IMSE-2
LTC3407IMSE-2#TR
LTBDZ
10-Lead Plastic MSOP
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 3.6V, unless otherwise specified. (Note 2)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP MAX
UNITS
VIN
Operating Voltage Range
IFB
Feedback Pin Input Current
2.5
5.5
V
30
nA
34072fc
2


Part Number LTC3407EMSE-2
Description 2.25MHz Step-Down DC/DC Regulator
Maker Linear
PDF Download

LTC3407EMSE-2 Datasheet PDF






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