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Linear Technology Electronic Components Datasheet

LTC3407AIDD Datasheet

Step-Down DC/DC Regulator

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FEATURES
n High Efficiency: Up to 96%
n Low Ripple (35mVP-P) Burst Mode Operation;
IQ = 40μA
n 1.5MHz Constant Frequency Operation
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 Optional External Soft-Start
n Small Thermally Enhanced MSOP and 3mm × 3mm
DFN Packages
APPLICATIONS
n PDAs/Palmtop PCs
n Digital Cameras
n Cellular Phones
n Wireless and DSL Modems
LTC3407A
Dual Synchronous 600mA,
1.5MHz Step-Down
DC/DC Regulator
DESCRIPTION
The LTC®3407A is a dual, constant frequency, synchronous
step-down DC/DC converter. Intended for low power ap-
plications, it operates from a 2.5V to 5.5V input voltage
range and has a constant 1.5MHz switching frequency,
enabling the use of tiny, low cost capacitors and inductors
1mm or less in height. Each output voltage is adjustable
from 0.6V to 5V. Internal synchronous 0.35Ω, 1A 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 ripple noise for low power efficiency. Burst
Mode® operation provides the highest efficiency at light
loads, while Pulse Skip Mode provides the lowest ripple
noise 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 and Burst Mode 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
1mm High 2.5V/1.8V at 600mA Step-Down Regulators
VIN = 2.5V
TO 5.5V
10μF
VOUT2 = 2.5V
AT 600mA
2.2μH
22pF
RUN/SS2 VIN
MODE/SYNC
RUN/SS1
POR
LTC3407A
SW2
SW1
100k
RESET
2.2μH
22pF
10μF
VFB2
VFB1
887k
280k
GND
887k
442k
VOUT1 = 1.8V
AT 600mA
10μF
3407A TA01
LTC3407A Efficiency/Power Loss Curve
100
1
2.5V
90
1.8V
80
0.1
70
60
50
0.01
40
30
20
10
0
1
0.001
VIN = 3.3V
Burst Mode OPERATION
NO LOAD ON OTHER CHANNEL
0.0001
10
100
1000
LOAD CURRENT (mA)
3407A TA02
3407afa
1


Linear Technology Electronic Components Datasheet

LTC3407AIDD Datasheet

Step-Down DC/DC Regulator

No Preview Available !

LTC3407A
ABSOLUTE MAXIMUM RATINGS (Note 1)
VIN Voltage...................................................– 0.3V to 6V
VFB1, VFB2 Voltages ................................... –0.3V to 1.5V
RUN/SS1, RUN/SS2 Voltages ......................–0.3V to VIN
MODE/SYNC Voltage....................................–0.3V to VIN
SW1, SW2 Voltages......................... –0.3V to VIN + 0.3V
POR Voltage................................................. –0.3V to 6V
Operating Temperature Range (Note 2)
LTC3407AE .......................................... –40°C to 85°C
LTC3407AI ......................................... –40°C to 125°C
Junction Temperature (Note 5) ............................. 125°C
Storage Temperature Range...................– 65°C to 150°C
Lead Temperature (Soldering, 10 sec)
LTC3407AMSE Only.......................................... 300°C
PIN CONFIGURATION
TOP VIEW
VFB1 1
RUN/SS1 2
VIN 3
SW1 4
GND 5
10 VFB2
9 RUN/SS2
11
8 POR
7 SW2
6 MODE/
SYNC
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
EXPOSED PAD IS PGND (PIN 11)
MUST BE CONNECTED TO GND
TJMAX = 125°C, θJA = 45°C/W, θJC = 10°C/W
TOP VIEW
VFB1 1
10 VFB2
RUN/SS1 2
9 RUN/SS2
VIN 3
11
8 POR
SW1 4
7 SW2
GND 5
6 MODE/
SYNC
MSE PACKAGE
10-LEAD PLASTIC MSOP
EXPOSED PAD IS PGND (PIN 11)
MUST BE CONNECTED TO GND
TJMAX = 125°C, θJA = 45°C/W, θJC = 10°C/W
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3407AEDD#PBF
LTC3407AEDD#TRPBF LCQN
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 85°C
LTC3407AIDD#PBF
LTC3407AIDD#TRPBF LCQN
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3407AEMSE#PBF
LTC3407AEMSE#TRPBF LTCRZ
10-Lead Plastic MSOP
–40°C to 85°C
LTC3407AIMSE#PBF
LTC3407AIMSE#TRPBF LTCRZ
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.
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/
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
2.5
5.5
IFB
VFB
ΔVLINE REG
Feedback Pin Input Current
Feedback Voltage (Note 3)
Reference Voltage Line Regulation
0°C ≤ TA ≤ 85°C
–40°C ≤ TA ≤ 125°C (LTC3407AI)
VIN = 2.5V to 5.5V (Note 3)
0.588
0.585
30
0.6 0.612
0.6 0.612
0.3
0.5
2
UNITS
V
nA
V
V
%/V
3407afa


Part Number LTC3407AIDD
Description Step-Down DC/DC Regulator
Maker Linear
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LTC3407AIDD Datasheet PDF






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