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Linear Technology Electronic Components Datasheet

LTC3544B Datasheet

Quad Synchronous Step-Down Regulator

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LTC3544B
Quad Synchronous
Step-Down Regulator: 2.25MHz,
300mA, 200mA, 200mA, 100mA
FEATURES
DESCRIPTION
High Efficiency: Up to 95%
Four Independent Regulators Provide Up to 300mA,
200mA, 200mA and 100mA Output Current
2.25V to 5.5V Input Voltage Range
2.25MHz Constant Frequency Operation
No Schottky Diodes Required
www.DaLtoawShDeerot4pUo.cuotmOperation: 100% Duty Cycle
Pulse Skipping at Low Load for Minimum Ripple
0.8V Reference Allows Low Output Voltages
Shutdown Mode Draws <1μA Supply Current
Current Mode Operation for Excellent Line and Load
Transient Response
Overtemperature Protected
Low Profile (3mm × 3mm) 16-Lead QFN Package
APPLICATIONS
Cellular Telephones
Personal Information Appliances
Wireless and DSL Modems
Digital Still Cameras
Media Players
Portable Instruments
The LTC®3544B is a quad, high efficiency, monolithic
synchronous buck regulator using a constant frequency,
current mode architecture. The four regulators operate in-
dependently with separate run pins. The 2.25V to 5.5V input
voltage range makes the LTC3544B well suited for single
Li-Ion/polymer battery-powered applications. 100% duty
cycle provides low dropout operation, extending battery
runtime in portable systems. At moderate and low output
load levels PWM pulse skip mode operation provides very
low output ripple voltage for noise sensitive applications.
Switching frequency is internally set to 2.25MHz, al-
lowing the use of small surface mount inductors and
capacitors.
The internal synchronous switches increase efficiency
and eliminate the need for external Schottky diodes. Low
output voltages are easily supported with the 0.8V feedback
reference voltage.
The LTC3544B is available in a low profile (0.75mm) (3mm
× 3mm) QFN package.
, LT, LTC and LTM 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, 5994885.
TYPICAL APPLICATION
High Efficiency Quad Step-Down Converter
VIN
2.25V TO 5.5V
VOUT2
1.5V
4.7μF
CER
4.7μF
CER
4.7μH
93.1k
107k
VOUT4
1.8V
4.7μF
CER
3.3μH
133k
107k
VCC
RUN200B
SW200B
VFB200B
PVIN
RUN200A
SW200A
VFB200A
LTC3544B
RUN300
SW300
VFB300
GNDA
RUN100
SW100
VFB100
PGND
3.3μH
100k
VOUT3
0.8V
4.7μF
CER
10μH
59k
118k
VOUT1
1.2V
4.7μF
CER
3544B TA01a
Efficiency vs Load Current, 300mA
Channel, All Other Channels Off
100
VOUT = 1.5V
90 TA = 25°C
1
80
70
EFFICIENCY
60
0.1
50
POWER LOSS
40
30 0.01
20
10
0
0.0001
0.001
0.01
VIN = 2.5V
VIN = 3.6V
VIN = 4.3V 0.001
0.1 1
LOAD CURRENT (A)
3544B TA01b
3544bfa
1


Linear Technology Electronic Components Datasheet

LTC3544B Datasheet

Quad Synchronous Step-Down Regulator

No Preview Available !

LTC3544B
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Supply Voltage .....................................–0.3V to 6V
RUNx ............................................. –0.3V to (VIN + 0.3V)
VFBx................................................ –0.3V to (VIN + 0.3V)
SWx ............................................... –0.3V to (VIN + 0.3V)
300mA P-Channel Source Current (DC) (Note 8) ..450mA
300mA N-Channel Sink Current (DC) (Note 8) ......450mA
200mA P-Channel Source Current (DC) (Note 8) ..300mA
200mA N-Channel Sink Current (DC) (Note 8) ......300mA
100mA P-Channel Source Current (DC) (Note 8) ..200mA
100mA N-Channel Sink Current (DC) (Note 8) ......200mA
wwwP.Deaakta3Sh0e0emt4AU.ScoWmSink and Source Current
(Note 8) ...........................................................600mA
Peak 200mA SW Sink and Source Current
(Note 8) ...........................................................400mA
Peak 100mA SW Sink and Source Current
(Note 8) ...........................................................200mA
Operating Temperature Range...................–40°C to 85°C
Junction Temperature (Notes 3, 4) ........................ 125°C
Storage Temperature Range ....................–65°C to 125°C
PIN CONFIGURATION
TOP VIEW
16 15 14 13
VFB200B 1
12 RUN100
VFB200A 2 17 11 VFB100
RUN200A 3
10 VFB300
SW200B 4
9 RUN300
5678
UD PACKAGE
16-LEAD (3mm × 3mm) PLASTIC QFN
TJMAX = 125°C, θJA = 68°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3544BEUD#PBF
LTC4263IDE#TRPBF
LCLN
16-Lead (3mm × 3mm) Plastic QFN
LEAD BASED FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3544BEUD
LTC4263IDE#TR
LCLN
16-Lead (3mm × 3mm) Plastic QFN
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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
TEMPERATURE RANGE
–40°C to 85°C
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. (Note 2)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
General Characteristics
VIN
VFBREGx
Input Voltage Range
Regulated Feedback Voltage (Note 5)
2.25
5.5
0.792 0.8 0.808
0.784 0.8 0.816
V
V
V
ΔVFBREGx
VLOADREG
IS
Reference Voltage Line Regulation (Note 5)
Output Voltage Load Regulation (Note 6)
Input DC Bias Current Active Mode (Pulse Skip)
VIN = 2.25V to 5.5V
VFB = 0.7V, ILOAD = 0A, 2.25MHz,
Four Regulators Enabled
0.05 0.25
0.5
825 1100
%/V
%
μA
Shutdown
0.1 2
μA
fOSC Oscillator Frequency
VIN = 3V
VIN = 2.5V to 5.5V
2.25
1.8
2.7
MHz
MHz
3544bfa
2


Part Number LTC3544B
Description Quad Synchronous Step-Down Regulator
Maker Linear Technology
Total Page 16 Pages
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