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Linear Technology Electronic Components Datasheet

LTC3407AIDD-2 Datasheet

2.25MHz Step-Down DC/DC Regulator

No Preview Available !

FEATURES
High Efficiency: Up to 95%
Low Ripple (<35mVPK-PK) Burst Mode Operation;
IQ = 40μA
2.25MHz Constant Frequency Operation
No Schottky Diodes Required
Low RDS(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: IQ <1μA
Output Voltages from 5V down to 0.6V
Power-On Reset Output
Externally Synchronizable Oscillator
Optional External Soft-Start
Small Thermally Enhanced MSOP and 3mm × 3mm
DFN Packages
U
APPLICATIO S
PDAs/Palmtop PCs
Digital Cameras
Cellular Phones
Wireless and DSL Modems
LTC3407A-2
Dual Synchronous 800mA,
2.25MHz Step-Down
DC/DC Regulator
DESCRIPTIO
The LTC®3407A-2 is a dual, constant frequency, synchro-
nous step-down DC/DC converter. Intended for low power
applications, it operates from a 2.5V to 5.5V input voltage
range and has a constant 2.25MHz 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.
, 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 APPLICATIO
1mm High 2.5V/1.8V at 800mA Step-Down Regulators
VIN = 2.5V
TO 5.5V
10μF
VOUT2 = 2.5V
AT 800mA
2.2μH
22pF
RUN/SS2 VIN
MODE/SYNC
RUN/SS1
POR
LTC3407A-2
SW2
SW1
100k
RESET
2.2μH
22pF
VOUT1 = 1.8V
AT 800mA
10μF
887k
280k
VFB2
GND
VFB1
887k
442k
10μF
3407A2 TA01
Efficiency/Power Loss Curve
100
90
80
70
60
50
40
30
20
10
0
1
1
2.5V
1.8V
0.1
0.01
0.001
VIN = 3.3V
Burst Mode OPERATION
NO LOAD ON OTHER CHANNEL
0.0001
10
100
1000
LOAD CURRENT (mA)
3407A2 TA02
3407a2f
1


Linear Technology Electronic Components Datasheet

LTC3407AIDD-2 Datasheet

2.25MHz Step-Down DC/DC Regulator

No Preview Available !

LTC3407A-2
ABSOLUTE AXI U RATI GS
(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-2 ..................................... – 40°C to 85°C
LTC3407AI-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)
LTC3407AEMSE-2 ............................................ 300°C
LTC3407AIMSE-2 ............................................. 300°C
PI CO FIGURATIO
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
TJMAX = 125°C, θJA = 45°C/W, θJC = 10°C/W
EXPOSED PAD (PIN 11) IS PGND, MUST BE CONNECTED TO GND
VFB1 1
RUN/SS1 2
VIN 3
SW1 4
GND 5
TOP VIEW
11
10 VFB2
9 RUN/SS2
8 POR
7 SW2
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
UW U
ORDER I FOR ATIO
LEAD FREE FINISH
LTC3407AEDD-2#PBF
LTC3407AEMSE-2#PBF
LTC3407AIDD-2#PBF
LTC3407AIMSE-2#PBF
LEAD BASED FINISH
LTC3407AEDD-2
LTC3407AEMSE-2
LTC3407AIDD-2
LTC3407AIMSE-2
TAPE AND REEL
LTC3407AEDD-2#TRPBF
LTC3407AEMSE-2#TRPBF
LTC3407AIDD-2#TRPBF
LTC3407AIMSE-2#TRPBF
TAPE AND REEL
LTC3407AEDD-2#TR
LTC3407AEMSE-2#TR
LTC3407AIDD-2#TR
LTC3407AIMSE-2#TR
PART MARKING*
LDDH
LTDDJ
LDDH
LTDDJ
PART MARKING*
LDDH
LTDDJ
LDDH
LTDDJ
PACKAGE DESCRIPTION
10-Lead (3mm × 3mm) Plastic DFN
10-Lead Plastic MSOP
10-Lead (3mm × 3mm) Plastic DFN
10-Lead Plastic MSOP
PACKAGE DESCRIPTION
10-Lead (3mm × 3mm) Plastic DFN
10-Lead Plastic MSOP
10-Lead (3mm × 3mm) Plastic DFN
10-Lead Plastic MSOP
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
–40°C to 125°C
–40°C to 125°C
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
–40°C to 125°C
–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/
3407a2f
2


Part Number LTC3407AIDD-2
Description 2.25MHz Step-Down DC/DC Regulator
Maker Linear
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