900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf




Linear Technology Electronic Components Datasheet

LTC3541-2 Datasheet

High Efficiency Buck + VLDO Regulator

No Preview Available !

FEATURES
High Efficiency, 500mA Buck Plus 300mA VLDO
Regulator
Auto Start-Up Powers Buck Output Prior to VLDO/
Linear Regulator 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: 1.875V
VLDO Input Voltage Range (LVIN: 1.6V to 5.5V)
Fixed VLDO Output Voltage: 1.5V
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
LTC3541-2
High Efficiency
Buck + VLDO Regulator
DESCRIPTIO
The LTC®3541-2 combines a synchronous buck DC/
DC converter with a very low dropout linear regulator
(VLDOTMregulator) and internal feedback resistor networks
to provide two output voltages from a single input volt-
age with minimal external components. When configured
for dual output operation, the LTC3541-2’s auto start-up
feature will bring the 1.875V buck output into regulation
in a controlled manner, prior to enabling the 1.5V VLDO
output without the need for external pin control. The
1.5V VLDO/linear regulator output prior to 1.875V buck
output sequencing may also be obtained via external pin
control. The input voltage range is ideally suited for Li-Ion
battery applications powering sub-3.3V logic from 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 output 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
VIN
2.9V TO 5.5V
2.2µH
VOUT1
1.875V
200mA
10µF
SW ENVLDO
VIN MODE
LTC3541-2
ENBUCK GND
VOUT
LVIN LVOUT
PGND
VOUT2
1.5V
2.2µF 300mA
35412 TA01a
Buck (Burst) Efficiency vs Load Current
100
90
VIN = 3V
80
70
EFFICIENCY
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) 35412 TA01b
35412fb



Linear Technology Electronic Components Datasheet

LTC3541-2 Datasheet

High Efficiency Buck + VLDO Regulator

No Preview Available !

LTC3541-2
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-2
LCHQ
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 (Note 2)
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX
IPK
Peak Inductor Current
VIN = 4.2V (Note 8)
0.8 0.95 1.25
VIN Input Voltage Range
(Note 4)
l 2.7
5.5
VIN(LINEREG)
LVIN(LINEREG)
VLDODO
VLOADREG
Buck VIN Line Regulation
V(RLeDfeOrrVeIdN
Line Regulation
to LVOUT)
Linear Regulator VIN Line
Regulation (Referred to LVOUT)
LVIN Line Regulation
(Referred to LVOUT)
LVIN – LVOUT Dropout Voltage
Buck Output Load Regulation
VIN = 2.7V to 5.5V, ENBUCK = VIN,
ENVLDO = 0V, MODE = VIN (Note 6)
EVNINV=LD2.O9V= tVoIN5,.5MVO, DLVEO=UT0V=,1IO.5UVT,(VELNDBOU) =CK10=0VmINA,
VIN = 2.9V to 5.5V, LVOUT = 1.5V, ENBUCK = 0V,
ENVLDO = VIN, IOUT(LDO) = 10mA
LVIN = 1.6V to 5.5V, VIN = 5.5V, LVOUT = 1.5V,
ENBUCK = VIN, ENVLDO = VIN, MODE = VIN,
IOUT(VLDO) = 100mA
LVOUT = 1.5V, ENBUCK = VIN, ENVLDO = VIN,
MODE = VIN, IOUT(VLDO) = 50mA (Note 9)
ENBUCK = VIN, ENVLDO = 0V, MODE = VIN (Note 6)
l
0.04 0.4
2.2
2.2
0.8
20 50
0.5
VVOUT
VLDO Output Load Regulation
Linear Regulator Output Load
Regulation
Reference Regulation Voltage
(Note 6)
EIONUBT(UVCLDKO=) =VI1Nm, EAN–VL3D00Om=AV, ILNV,IMN O=D1E.8=75VVI,NLVOUT = 1.5V,
IOUT(LDO) = 1mA – 30mA, LVOUT = 1.5V,
ENBUCK = 0V, ENVLDO = VIN
ENBUCK = VIN, ENVLDO = 0V, TA = 25°C
ENBUCK = VIN, ENVLDO = 0V, 0°C ≤ TA ≤ 85°C
l
l
1.837
1.833
0.25
0.25
1.875
1.875
0.5
0.5
1.913
1.917
ENBUCK = VIN, ENVLDO = 0V, –40°C ≤ TA ≤ 85°C
l 1.828 1.875 1.922
VLVOUT
Reference Regulation Voltage ENBUCK = 0V, ENVLDO = VIN, TA = 25°C
(Note 7)
ENBUCK = 0V, ENVLDO = VIN, 0°C ≤ TA ≤ 85°C
1.47
1.466
1.5 1.53
1.5 1.534
ENBUCK = 0V, ENVLDO = VIN, –40°C ≤ TA ≤ 85°C
l 1.462
1.5 1.538
UNITS
A
V
%/V
mV/V
mV/V
mV/V
mV
%
%
%
V
V
V
V
V
V
35412fb



Part Number LTC3541-2
Description High Efficiency Buck + VLDO Regulator
Maker Linear Technology
Total Page 20 Pages
PDF Download

LTC3541-2 Datasheet PDF

View PDF for Mobile








Similar Datasheet

1 LTC3541-1 High Efficiency Buck + VLDO Regulator
Linear
2 LTC3541-2 High Efficiency Buck + VLDO Regulator
Linear Technology
3 LTC3541-3 High Efficiency Buck + VLDO Regulator
Linear Technology





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z

Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy