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Linear Technology Electronic Components Datasheet

LTC3547B Datasheet

Dual Monolithic 300mA Synchronous Step-Down Regulator

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FEATURES
High Efficiency (Up to 96%) Dual Step-Down
Outputs
300mA Output Current per Channel at VIN = 3V
2.25MHz Constant-Frequency Operation
2.5V to 5.5V Input Voltage Range
www.DaLtoawShDeerot4pUo.cuotmOperation: 100% Duty Cycle
No Schottky Diodes Required
Internally Compensated for All Ceramic Capacitors
Independent Internal Soft-Start for Each Channel
Available in Fixed Output Versions
Current Mode Operation for Excellent Line and Load
Transient Response
0.6V Reference Allows Low Output Voltages
Short-Circuit Protected
Ultralow Shutdown Current: IQ < 1μA
Low Profile (0.75mm) 8-Lead 3mm × 2mm
DFN Package
U
APPLICATIO S
Cellular Telephones
Digital Still Cameras
Wireless and DSL Modems
Portable Media Players
PDAs/Palmtop PCs
LTC3547B
Dual Monolithic
300mA Synchronous
Step-Down Regulator
DESCRIPTIO
The LTC®3547B is a dual, 2.25MHz, constant-frequency,
synchronous step-down DC/DC converter in a tiny 3mm ×
2mm DFN package. 100% duty cycle provides low drop-
out operation, extending battery life in portable systems.
Low output voltages are supported with the 0.6V feed-
back reference voltage. Each regulator can supply 300mA
continuous output current.
The input voltage range is 2.5V to 5.5V, making it ideal
for Li-Ion polymer and USB powered applications. Supply
current is only 1μA in shutdown.
An internally set 2.25MHz switching frequency allows the
use of tiny surface mount inductors and capacitors. Inter-
nal soft-start reduces inrush current during start-up. All
outputs are internally compensated to work with ceramic
capacitors. The LTC3547B is available in a low profile
(0.75mm) 3mm × 2mm DFN package. The LTC3547B
is also available in a fixed output voltage configuration
selected via internal resistor dividers (see Table 2).
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Protected by U.S. Patents,
including 6580258, 5481178, 6304066, 6127815, 6498466, 6611131.
TYPICAL APPLICATIO
Dual Monolithic Buck Regulator in 8-Lead 3mm × 2mm DFN
VIN
2.5V TO 5.5V
VOUT2
1.8V AT
300mA
4.7μF
4.7μH
10pF
RUN2 VIN RUN1
LTC3547B
SW2 SW1
4.7μH
10pF
VOUT1
2.5V AT
300mA
4.7μF 475k
VFB2
VFB1
GND
237k
150k 475k
4.7μF
3547b TA01
100
90
80
70
60
50
40
30
20
10
0
1
Efficiency vs Output Current
for VOUT = 2.5V
1
0.1
0.01
VIN = 2.7V
VIN = 3.6V
VIN = 4.2V
0.001
10 100 1000
OUTPUT CURRENT (mA)
3547b TA01b
3547bfb
1


Linear Technology Electronic Components Datasheet

LTC3547B Datasheet

Dual Monolithic 300mA Synchronous Step-Down Regulator

No Preview Available !

LTC3547B
ABSOLUTE AXI U RATI GS
(Note 1)
VIN
LTC3547BE .............................................. –0.3V to 6V
LTC3547BI ............................................... –0.3V to 7V
VFB1, VFB2 ......................................... –0.3V to VIN +0.3V
RUN1, RUN2..................................... –0.3V to VIN +0.3V
SW1, SW2 (DC) ................................ –0.3V to VIN +0.3V
P-Channel Switch Source Current (DC)................500mA
N-Channel Switch Sink Current (DC) ...................500mA
Peak SW Sink and Source Current (Note 5) .........700mA
wwwA.DmabtaieSnhet eOtp4Ue.rcaotming Temperature Range (Note 2)
LTC3547BE .......................................... –40°C to 85°C
LTC3547BI ......................................... –40°C to 125°C
Maximum Junction Temperature........................... 125°C
Storage Temperature Range................... –65°C to 125°C
PIN CONFIGURATION
TOP VIEW
VFB1 1
8 VFB2
RUN1 2
7 RUN2
9
VIN 3
6 SW2
SW1 4
5 GND
DDB PACKAGE
8-LEAD (3mm × 2mm) PLASTIC DFN
TJMAX = 125°C, θJA = 76°C/W
EXPOSED PAD (PIN 9) IS GND
MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3547BEDDB#PBF
LTC3547BEDDB#TRPBF LCPD
8-Lead (3mm × 2mm) Plastic DFN
–40°C to 85°C
LTC3547BEDDB-1#PBF LTC3547BEDDB-1#TRPBF LCPF
8-Lead (3mm × 2mm) Plastic DFN
–40°C to 85°C
LTC3547BIDDB #PBF
LTC3547BIDDB #TRPBF LCPD
8-Lead (3mm × 2mm) Plastic DFN
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *Temperature grades are 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 denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 3.6V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX
VIN VIN Operating Voltage
LTC3547BE, LTC3547BE-1,
LTC3547BI
2.5
2.5
5.5
6.5
VUV
VIN Undervoltage Lockout
VIN Low to High
2.2 2.5
IFB
VFBREG1
VFBREG2
Feedback Pin Input Current
Regulated Feedback Voltage (VFB1)
Regulated Feedback Voltage (VFB2)
LTC3547BE, VFB = VFBREG
LTC3547BE-1, VFB = VFBREG
LTC3547BE, 0°C ≤ TA ≤ 85°C
LTC3547BE, –40°C ≤ TA ≤ 85°C
LTC3547BI, –40°C ≤ TA ≤ 125°C
LTC3547BE-1, 0°C ≤ TA ≤ 85°C
LTC3547BE-1, –40°C ≤ TA ≤ 85°C
LTC3547BE, 0°C ≤ TA ≤ 85°C
LTC3547BE, –40°C ≤ TA ≤ 85°C
LTC3547BI, –40°C ≤ TA ≤ 125°C
LTC3547BE-1, 0°C ≤ TA ≤ 85°C
LTC3547BE-1, –40°C ≤ TA ≤ 85°C
0.590
0.588
0.588
1.770
1.764
0.590
0.588
0.588
1.180
1.176
3
0.600
0.600
0.600
1.800
1.800
0.600
0.600
0.600
1.200
1.200
±30
6
0.610
0.612
0.612
1.830
1.836
0.610
0.612
0.612
1.220
1.224
UNITS
V
V
V
nA
μA
V
V
V
V
V
V
V
V
V
V
3547bfb
2


Part Number LTC3547B
Description Dual Monolithic 300mA Synchronous Step-Down Regulator
Maker Linear Technology
Total Page 16 Pages
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