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Linear Technology Electronic Components Datasheet

LTC3548A Datasheet

2.25MHz Step-Down DC/DC Regulator

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LTC3548A
FEATURES
Dual Synchronous
400mA/800mA, 2.25MHz
Step-Down DC/DC Regulator
DESCRIPTION
n High Efficiency: Up to 95%
n Low Ripple (<35mVP-P) Burst Mode Operation;
IQ = 40μA
n 2.25MHz Constant Frequency Operation
n High Switch Current: 0.7A and 1.2A
n No Schottky Diodes Required
wwwn.DaLtoawShReeDtS4(UO.cNo) mInternal 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
The LTC®3548A 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 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, 0.7A/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 ripple noise for low power efficiency. Burst
Mode® operation provides the highest efficiency at light
loads, while pulse-skipping 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, Linear Technology, the Linear logo 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
2.5V/1.8V at 400mA/800mA Step-Down Regulators
VIN
2.5V TO 5.5V
10μF
VOUT2
2.5V
400mA
4.7μH
22pF
RUN/SS2 VIN RUN/SS1
MODE/SYNC
POR
SW2 SW1
LTC3548A
100k
RESET
2.2μH
22pF
VOUT1
1.8V
800mA
VFB2
VFB1
887k
4.7μF
280k
GND
442k 887k
10μF
3548A TA01
Efficiency/Power Loss Curves
100
2.5V
90
80
70
60
1
1.8V
0.1
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)
3548A TA02
3548af
1


Linear Technology Electronic Components Datasheet

LTC3548A Datasheet

2.25MHz Step-Down DC/DC Regulator

No Preview Available !

LTC3548A
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 + 0.3V
MODE/SYNC Voltage.........................–0.3V to VIN + 0.3V
SW1, SW2 Voltages......................... –0.3V to VIN + 0.3V
POR Voltage................................................. –0.3V to 6V
Operating Junction Temperature Range (Note 2)
LTC3548AE .......................................... –40°C to 85°C
LTC3548AI ......................................... –40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
MSOP ............................................................... 300°C
PIN CONFIGURATION
www.DataSheet4U.com
TOP VIEW
VFB1
RUN/SS1
VIN
SW1
NC
1
2
3
4
5
10 VFB2
9 RUN/SS2
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 SOLDERED TO GND
VFB1 1
RUN/SS1 2
VIN 3
SW1 4
NC 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 SOLDERED TO GND
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING* PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3548AEDD#PBF
LTC3548AEDD#TRPBF
LFKV
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 85°C
LTC3548AEMSE#PBF
LTC3548AEMSE#TRPBF
LTFKW
10-Lead Plastic MSOP
–40°C to 85°C
LTC3548AIDD#PBF
LTC3548AIDD#TRPBF
LFKV
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3548AIMSE#PBF
LTC3548AIMSE#TRPBF
LTFKW
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/
3548af
2


Part Number LTC3548A
Description 2.25MHz Step-Down DC/DC Regulator
Maker Linear Technology
Total Page 20 Pages
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