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Linear Technology Electronic Components Datasheet

LTC3548-1 Datasheet

Fixed Output 2.25MHz Step-Down DC/DC Regulator

No Preview Available !

FEATURES
n High Efficiency: Up to 95%
n 1.8V at 800mA/1.575V at 400mA
n Very Low Quiescent Current: Only 40μA
n 2.25MHz Constant Frequency Operation
n High Switch Current: 1.2A and 0.7A
n No Schottky Diodes Required
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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 Small Thermally Enhanced 3mm × 3mm
DFN Packages
APPLICATIONS
n PDAs/Palmtop PCs
n Digital Cameras
n Cellular Phones
n Portable Media Players
n PC Cards
n Wireless and DSL Modems
LTC3548-1
Dual Synchronous, Fixed
Output 2.25MHz Step-Down
DC/DC Regulator
DESCRIPTION
The LTC®3548-1 is a dual, fixed output, constant frequency,
synchronous step-down DC/DC converter. Intended for low
power applications, it operates from 2.5V 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 ≤1mm. The output voltage
for channel 1 is fixed at 1.8V and for channel 2 is fixed
at 1.575V. Internal synchronous 0.35Ω, 1.2A/0.7A power
switches provide high efficiency without the need for ex-
ternal Schottky diodes. Burst Mode® operation provides
high efficiency at light loads.
To further maximize battery runtime, the P-channel
MOSFETs are turned on continuously in dropout (100%
duty cycle), and both channels draw a total quiescent cur-
rent of only 40μA. In shutdown, the device draws <1μA.
The LTC3548-1 is available in both thin (0.75mm) and
ultra-thin (0.55mm) 3mm × 3mm DFN packages.
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
VIN
2.7V TO 5.5V
VOUT2
1.575V
400mA
COUT2
10μF
CER
CIN
10μF
CER
4.7μH
CFF2
330pF
VIN RUN1 RUN2
LTC3548-1
SW2 SW1
VOUT2
VOUT1
VFB2
GND
VFB1
2.2μH
CFF1
330pF
VOUT1
1.8V
800mA
COUT1
10μF
CER
3548-1 F01
Figure 1. 1.8V/1.575V at 800mA/400mA Step-Down Regulators
LTC3548-1 Efficiency Curve/Power Loss
100 1000
95
90
VOUT1 = 1.8V
85
100
80 VOUT2 = 1.575V
75
10
70 1
65 CHANNEL 1
CHANNEL 2
60 0.1
1 10 100 1000
LOAD CURRENT (mA)
35481 F01b
35481fb
1


Linear Technology Electronic Components Datasheet

LTC3548-1 Datasheet

Fixed Output 2.25MHz Step-Down DC/DC Regulator

No Preview Available !

LTC3548-1
ABSOLUTE MAXIMUM RATINGS (Note 1)
VIN Voltages .................................................– 0.3V to 6V
VFB1, VFB2, VOUT1, VOUT2,
RUN1, RUN2 Voltages ..................... –0.3V to VIN + 0.3V
SW1, SW2 Voltage........................... –0.3V to VIN + 0.3V
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
www.DataSheet4U.com VFB1
VOUT1
VIN
SW1
GND
1
2
3
4
5
10 VFB2
9 VOUT2
11 8 RUN1
7 SW2
6 RUN2
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 40°C/W, θJC = 3°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB GND
(SOLDERED TO A 4-LAYER BOARD)
TOP VIEW
VFB1
VOUT1
VIN
SW1
GND
1
2
3
4
5
10 VFB2
9 VOUT2
11 8 RUN1
7 SW2
6 RUN2
KD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC UTDFN
TJMAX = 125°C, θJA = 43°C/W, θJC = 10°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB GND
(SOLDERED TO A 4-LAYER BOARD)
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING PACKAGE DESCRIPTION
LTC3548EDD-1#PBF
LTC3548EDD-1#TRPBF
LBZC
10-Lead (3mm × 3mm) Plastic DFN
LTC3548EKD-1#PBF
LTC3548EKD-1#TRPBF
CXVT
10-Lead (3mm × 3mm) Plastic UTDFN
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
–40°C to 85°C
35481fb
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Part Number LTC3548-1
Description Fixed Output 2.25MHz Step-Down DC/DC Regulator
Maker Linear Technology
Total Page 16 Pages
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