900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf




Linear Technology Electronic Components Datasheet

LTC3407EDD-3 Datasheet

2.25MHz Step-Down DC/DC Regulator

No Preview Available !

LTC3407-3
FEATURES
Dual Synchronous,
1.8V/0.8A and 3.3V/0.8A
2.25MHz Step-Down DC/DC Regulator
DESCRIPTION
n Very Low Quiescent Current: Only 40μA
n 1.8V at 800mA/3.3V at 800mA
n High Efficiency: Up to 95%
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 VIN: 3.3V to 5.5V
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 Power-On Reset Output
n Externally Synchronizable Oscillator
n Small Thermally Enhanced 3mm × 3mm DFN Package
APPLICATIONS
n PDAs/Palmtop PCs
n Digital Cameras
n Cellular Phones
n Portable Media Players
n PC Cards
n Wireless and DSL Modems
The LTC®3407-3 is a dual, constant frequency, synchro-
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® 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. Protected by U.S. Patents, including 5481178, 6580258, 6304066, 6127815, 6498466,
6611131.
TYPICAL APPLICATION
VIN
3.3V TO 5.5V
VOUT2
3.3V
10μF
2.2μH
10μF
RUN2 VIN RUN1
MODE/SYNC
POR
LTC3407-3
SW2
SW1
VOUT2
GND
VOUT1
100k
RESET
2.2μH
VOUT1
1.8V
10μF
34073 TA01
NOTE: IN DROPOUT, THE OUTPUT TRACKS THE INPUT VOLTAGE
Figure 1. 1.8V/3.3V at 800mA Step-Down Regulators
LTC3407-3 Efficiency/Power Loss
100
1
VOUT = 3.3V
90
80
VOUT = 1.8V
0.1
70
60
VOUT = 3.3V
0.01
50
VOUT = 1.8V
40
30
0.001
VIN = 5V
20
Burst Mode OPERATION
NO LOAD ON OTHER CHANNEL
10
0.000
1
10
100
1000
LOAD CURRENT (mA)
34073 TA01b
34073fb
1


Linear Technology Electronic Components Datasheet

LTC3407EDD-3 Datasheet

2.25MHz Step-Down DC/DC Regulator

No Preview Available !

LTC3407-3
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VIN Voltages .................................................– 0.3V to 6V
VOUT1, VOUT2 Voltages ..................... –0.3V to VIN + 0.3V
RUN1, RUN2 Voltages .................................–0.3V to VIN
MODE/SYNC Voltage....................................–0.3V to VIN
SW1, SW2 Voltage........................... –0.3V to VIN + 0.3V
POR Voltage................................................. –0.3V to 6V
Ambient Operating Temperature
Range (Note 2)......................................... –40°C to 85°C
Junction Temperature (Note 5) ............................. 125°C
Storage Temperature Range...................– 65°C to 125°C
PIN CONFIGURATION
TOP VIEW
VOUT1 1
RUN1 2
VIN 3
SW1 4
GND 5
10 VOUT2
9 RUN2
11
8 POR
7 SW2
6 MODE/
SYNC
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 40°C/W, θJC = 10°C/W
EXPOSED PAD (PIN 11) IS PGND, MUST BE SOLDERED TO PCB GND
ORDERING INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3407EDD-3#PBF
LTC3407EDD-3#TRPBF LCJB
10-Lead (3mm × 3mm) Plastic DFN
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
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/
TEMPERATURE RANGE
–40°C to 85°C
ELECTRICAL CHARACTERISTICS The l 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
VIN
Operating Voltage Range
3.3
5.5
VOUT1
Output Voltage (Note 3)
0°C ≤ TA ≤ 85°C
–40°C ≤ TA ≤ 85°C
VOUT2
Output Voltage (Note 3)
0°C ≤ TA ≤ 85°C
–40°C ≤ TA ≤ 85°C
ΔVLINE REG Reference Voltage Line Regulation (Note 3) VIN = 3.3V to 5.5V (Channel 1)
VIN = 3.6V to 5.5V (Channel 2)
ΔVLOAD REG Output Voltage Load Regulation (Note 3)
IS
Input DC Supply Current (Note 4)
Active Mode
Sleep Mode
Shutdown
VOUT1 = 1.5V, VOUT2 = 2.8V
VOUT1 = 1.9V, VOUT2 = 3.5V, MODE/SYNC = 3.6V
RUN = 0V, VIN = 5.5V, MODE/SYNC = 0V
fOSC
Oscillator Frequency
VOUT1 = 1.8V, VOUT2 = 3.3V
fSYNC
Synchronization Frequency
1.764
1.755
3.234
3.218
1.8
1.8 1.836
1.8 1.836
3.3 3.366
3.3 3.366
0.3
0.5
0.5
700 950
40
60
0.1
1
2.25 2.7
2.25
UNITS
V
V
V
V
V
%/V
%
μA
μA
μA
MHz
MHz
34073fb
2


Part Number LTC3407EDD-3
Description 2.25MHz Step-Down DC/DC Regulator
Maker Linear
PDF Download

LTC3407EDD-3 Datasheet PDF






Similar Datasheet

1 LTC3407EDD-2 2.25MHz Step-Down DC/DC Regulator
Linear
2 LTC3407EDD-3 2.25MHz Step-Down DC/DC Regulator
Linear
3 LTC3407EDD-4 2.25MHz Step-Down DC/DC Regulator
Linear





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z



Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy