DC/DC Regulator. LTC3407A Datasheet

LTC3407A Regulator. Datasheet pdf. Equivalent

Part LTC3407A
Description Step-Down DC/DC Regulator
Feature www.DataSheet4U.com LTC3407A Dual Synchronous 600mA, 1.5MHz Step-Down DC/DC Regulator FEATURES ■ ■.
Manufacture Linear Technology
Datasheet
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LTC3407A
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FEATURES
High Efficiency: Up to 96%
Low Ripple (35mVPK-PK) Burst Mode Operation;
IQ = 40µA
1.5MHz Constant Frequency Operation
No Schottky Diodes Required
Low RDS(ON) Internal Switches: 0.35
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
Dual Synchronous 600mA,
1.5MHz Step-Down
DC/DC Regulator
DESCRIPTIO
The LTC®3407A 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 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 0.35, 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 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
VOUT1 = 1.8V
AT 600mA
10µF
887k
280k
VFB2
GND
VFB1
887k
442k
10µF
3407A TA01
LTC3407A 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)
3407A TA02
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LTC3407A
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LTC3407A
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
Ambient Operating Temperature
Range (Note 2) ................................... – 40°C to 85°C
Junction Temperature (Note 5) ............................. 125°C
Storage Temperature Range
LTC3407AEMSE ............................... – 65°C to 125°C
LTC3407AEDD .................................. – 65°C to 125°C
Lead Temperature (Soldering, 10 sec)
LTC3407AEMSE only ....................................... 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
VFB1
RUN/SS1
VIN
SW1
GND
1
2
3
4
5
10 VFB2
9 RUN/SS2
11 8 POR
7 SW2
6 MODE/
SYNC
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
ORDER PART
NUMBER
LTC3407AEDD
DD PART MARKING
TOP VIEW
VFB1 1
RUN/SS1 2
10 VFB2
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
EXPOSED PAD IS PGND (PIN 11)
MUST BE CONNECTED TO GND
TJMAX = 125°C, θJA = 45°C/W, θJC = 10°C/W
LCQN
TJMAX = 125°C, θJA = 45°C/W, θJC = 10°C/W
Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ORDER PART
NUMBER
LTC3407AEMSE
MSE PART MARKING
LTCRZ
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
VIN
IFB
VFB
VLINE REG
VLOAD REG
IS
fOSC
fSYNC
ILIM
RDS(ON)
Operating Voltage Range
Feedback Pin Input Current
Feedback Voltage (Note 3)
Reference Voltage Line Regulation
Output Voltage Load Regulation
Input DC Supply Current
Active Mode
Sleep Mode
Shutdown
Oscillator Frequency
Synchronization Frequency
Peak Switch Current Limit
Top Switch On-Resistance
Bottom Switch On-Resistance
0°C TA 85°C
–40°C TA 85°C
VIN = 2.5V to 5.5V (Note 3)
MODE/SYNC = 0V (Note 3)
(Note 4)
VFB1 = VFB2 = 0.5V
VFB1 = VFB2 = 0.63V, MODE/SYNC = 3.6V
RUN = 0V, VIN = 5.5V, MODE/SYNC = 0V
VFBX = 0.6V
VIN = 3V, VFBX = 0.5V, Duty Cycle <35%
(Note 6)
(Note 6)
2.5
5.5
30
0.588 0.6 0.612
0.585 0.6 0.612
0.3 0.5
0.5
600 800
40 60
0.1 1
1.2 1.5 1.8
1.5
0.75 1 1.25
0.35 0.45
0.30 0.45
ISW(LKG)
Switch Leakage Current
VIN = 5V, VRUN = 0V, VFBX = 0V
0.01 1
UNITS
V
nA
V
V
%/V
%
µA
µA
µA
MHz
MHz
A
µA
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