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Linear Technology Electronic Components Datasheet

LTC3541-3 Datasheet

High Efficiency Buck + VLDO Regulator

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FEATURES
High Efficiency 500mA Buck Plus 300mA VLDO
Regulator
Auto Start-Up Powers VLDO/Linear Regulator
Output Prior to Buck Output
Independent 500mA High Efficiency Buck
(VIN: 2.7V to 5.5V)
300mA VLDO Regulator with 30mA Standalone Mode
www. DaNtoaSEhxeteetr4nUa.cloSmchottky Diodes Required
Fixed Buck Output Voltage: 1.8V
VLDO Input Voltage Range (LVIN: 1.675V to 5.5V)
Fixed VLDO Output Voltage: 1.575V
Selectable Fixed Frequency, Pulse-Skip Operation
or Burst Mode® Operation
Short-Circuit Protected
Current Mode Operation for Excellent Line and Load
Transient Response
Shutdown Current: <3µA
Constant Frequency Operation: 2.25MHz
Low Dropout Buck Operation: 100% Duty Cycle
Small, Thermally Enhanced, 10-Lead (3mm × 3mm)
APDFPNLPIaCckAagTeIOUS
Digital Cameras
Cellular Phones
PC Cards
Wireless and DSL Modems
Other Portable Power Systems
LTC3541-3
High Efficiency
Buck + VLDO Regulator
DESCRIPTIO
The LTC®3541-3 combines a synchronous buck DC/
DC converter with a very low dropout linear regulator
(VLDOTM regulator)andinternalfeedbackresistornetworks
to provide two output voltages from a single input voltage
with minimum external components. When configured
for dual output operation, the LTC3541-3’s auto start-up
feature will bring the 1.575V VLDO/linear regulator output
into regulation in a controlled manner prior to enabling the
1.8V buck output without the need for external pin control.
The 300mA VLDO/linear regulator output will source only
30mA until the buck output achieves regulation. The input
voltage range is ideally suited for applications powered
from a Li-Ion battery and 5V or 3.3V rails.
The synchronous buck converter provides a high efficiency
output, typically 90%. It can provide up to 500mA of output
current while switching at 2.25MHz, allowing the use of
small surface mount inductors and capacitors. A mode
select pin allows Burst Mode operation to be enabled for
higher efficiency at light load currents, or disabled for lower
noise, constant frequency operation.
The VLDO regulator provides a low noise, low voltage
output capable of providing up to 300mA of output current
using only a 2.2µF ceramic capacitor. The input supply
voltage of the VLDO regulator (LVIN) may come from the
buck regulator or a separate supply.
, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology
Corporation. VLDO is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 5481178, 6611131, 6304066, 6498466, 6580258.
TYPICAL APPLICATIO
LTC3541-3 Typical Application
VIN
3V TO 5V
2.2µH
VOUT1
1.8V
10µF
SW ENVLDO
VIN MODE
LTC3541-3
ENBUCK GND
VOUT
LVIN LVOUT
PGND
VOUT2
1.575V
2.2µF
35413 TA01a
Buck (Burst) Efficiency vs Load Current
100
90
VIN = 3V
80 EFFICIENCY
70
1
0.1
60
50
POWER
LOSS
0.01
40
30
0.001
20
10
0 0.0001
1 10 100 1000
LOAD CURRENT (mA)
35413 TA01b
35413fc



Linear Technology Electronic Components Datasheet

LTC3541-3 Datasheet

High Efficiency Buck + VLDO Regulator

No Preview Available !

LTC3541-3
ABSOLUTE AXI U RATI GS
(Note 1)
Supply Voltages:
VIN, LVIN................................................... –0.3V to 6V
LVIN – VIN...........................................................<0.3V
Pin Voltages:
ENVLDO, ENBUCK, MODE, SW ......–0.3V to VIN + 0.3V
Linear Regulator IOUT(MAX) (100ms) (Note 9).......100mA
Operating Ambient Temperature Range
(Note 2).................................................... –40°C to 85°C
Junction Temperature (Notes 5, 10)...................... 125°C
Storage Temperature Range................... –65°C to 125°C
www.DataSheet4U.com
PACKAGE/ORDER IUFORWATIOU
TOP VIEW
VIN
ENBUcK
VOUT
Nc
LVOUT
1
2
3
4
5
10 SW
9 ENVLDO
11 8 MODE
7 GND
6 LVIN
DD PAcKAGE
10-LEAD (3mm × 3mm) PLASTIc DFN
TJMAX = 125°C, θJA = 43°C/W
EXPOSED PAD (PIN 11) IS PGND, MUST BE SOLDERED TO PCB
Order part number DD part marking
LTC3541EDD-3
LCHR
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.
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 (Notes 2, 3).
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX
IPK
VIN
VIN(LINEREG)
LVIN(LINEREG)
VLDODO
VLOADREG
VVOUT
VLVOUT
Peak Inductor Current
Input Voltage Range
Buck VIN Line Regulation
VLDO VIN Line Regulation
(Referred to LVOUT)
LRiengeualraRtioengu(lRateoferrVreINd
Line
to LVOUT)
LVIN Line Regulation
(Referred to LVOUT)
LVIN – LVOUT Dropout Voltage
Buck Output Load Regulation
VLDO Output Load Regulation
Linear Regulator Output Load
Regulation
Reference Regulation Voltage
(Note 6)
Reference Regulation Voltage
(Note 7)
VIN = 4.2V (Note 8)
(Note 4)
VIN = 2.7V to 5.5V, ENBUCK = VIN,
ENVLDO = 0V, MODE = VIN (Note 6)
VIN = 3V to 5.5V, LVOUT = 1.575V, ENBUCK = VIN,
ENVLDO = VIN, MODE = 0V, IOUT(VLDO) = 100mA
EVNINV=LD3VO t=oV5I.N5,VI,OLUVTO(LUDTO=) =1.1507m5VA, ENBUCK = 0V,
LVIN = 1.675V to 5.5V, VIN = 5.5V, LVOUT = 1.575V,
ENBUCK =
IOUT(VLDO)
=VI1N0, 0EmNVALDO
=
VIN,
MODE
=
VIN,
MLVOODUTE
=
=
1.575V, ENBUCK
VIN, IOUT(VLDO) =
=50VmINA,
ENVLDO
(Note 9)
=
VIN,
ENBUCK = VIN, ENVLDO = 0V, MODE = VIN (Note 6)
IOUT(VLDO) = 1mA – 300mA, LVIN = 1.8V, LVOUT = 1.575V,
ENBUCK = VIN, ENVLDO = VIN, MODE = VIN
IOUT(LDO) = 1mA – 30mA, LVOUT = 1.575V,
ENBUCK = 0V, ENVLDO = VIN
ENBUCK = VIN, ENVLDO = 0V, TA = 25°C
ENBUCK = VIN, ENVLDO = 0V, 0°C ≤ TA ≤ 85°C
ENBUCK = VIN, ENVLDO = 0V, –40°C ≤ TA ≤ 85°C
ENBUCK = 0V, ENVLDO = VIN, TA = 25°C
ENBUCK = 0V, ENVLDO = VIN, 0°C ≤ TA ≤ 85°C
ENBUCK = 0V, ENVLDO = VIN, –40°C ≤ TA ≤ 85°C
l
l
l
l
l
l
0.8
2.7
1.764
1.760
1.755
1.543
1.540
1.536
0.95 1.25
5.5
0.04 0.4
2.2
2.2
0.8
20
0.5
0.25
0.25
1.8
1.8
1.8
1.575
1.575
1.575
50
0.5
0.5
1.836
1.840
1.845
1.607
1.610
1.614
UNITS
A
V
%/V
mV/V
mV/V
mV/V
mV
%
%
%
V
V
V
V
V
V
35413fc



Part Number LTC3541-3
Description High Efficiency Buck + VLDO Regulator
Maker Linear Technology
Total Page 20 Pages
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