900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf




Linear Technology Electronic Components Datasheet

LTC3499EMS8 Datasheet

750mA Synchronous Step-Up DC/DC Converters

No Preview Available !

LTC3499/LTC3499B
750mA Synchronous
Step-Up DC/DC Converters
with Reverse-Battery Protection
FEATURES
n Reverse-Battery Protection for DC/DC Converter
and Load
n High Efficiency: Up to 94%
n Generates 5V at 175mA from a 1.8V Input
n Operates from 1.8V to 5.5V Input Supply
n 2V to 6V Adjustable Output Voltage
n Inrush Current Controlled During Start-Up
n Output Disconnnect in Shutdown
n Low Noise 1.2MHz PWM Operation
n Tiny External Components
n Automatic Burst Mode® Operation (LTC3499)
n Continuous Switching at Light Loads (LTC3499B)
n Overvoltage Protection
n 8-Lead (3mm × 3mm × 0.75mm) DFN
and MSOP Packages
APPLICATIONS
n Medical Equipment
n Digital Cameras
n MP3 Players
n Handheld Instruments
L, 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.
DESCRIPTION
The LTC®3499/LTC3499B are synchronous, fixed frequency
step-up DC/DC power converters with integrated reverse
battery protection that protect and disconnect the devices
and load when the battery polarity is reversed while
delivering high efficiency in a small (3mm × 3mm) DFN
package. True output disconnect eliminates inrush current
and allows zero load current in shutdown.
The devices feature an input voltage range of 1.8V to 5.5V
enabling operation from two alkaline or NiMH batteries. The
switching frequency is internally set at 1.2MHz allowing
the use of tiny surface mount inductors and capacitors.
A minimal number of external components are required
to generate output voltages ranging from 2V to 6V. The
LTC3499 features automatic Burst Mode operation to
increase efficiency at light loads, while the LTC3499B
features continuous switching at light loads.
The soft-start time is externally programmable through a
small capacitor. Anti-ring circuitry reduces EMI emissions
by damping the inductor in discontinuous mode. The de-
vices feature <1µA shutdown supply current, integrated
overvoltage protection and are available in both 8-pin
(3mm × 3mm) DFN and 8-pin MSOP packages.
TYPICAL APPLICATION
Two AA Cells to 5V Synchronous Boost Converter
VIN
1.8V TO 3.2V +
100k
330pF
4.7µH
2.2µF
VIN
SW
LTC3499
ON OFF SHDN
VOUT
VC
FB
SS
GND
0.01µF
1M
324k
VOUT
5V
175mA
10µF
3499 TA01
Battery Current vs VIN
1.0
SHDN = 0V
VOUT = 0V
0.5
0
–0.5
–1.0
–6
–4 –2
0
2
VIN AND SW VOLTAGE (V)
4
6
3499 TA01b
3499fc
1


Linear Technology Electronic Components Datasheet

LTC3499EMS8 Datasheet

750mA Synchronous Step-Up DC/DC Converters

No Preview Available !

LTC3499/LTC3499B
ABSOLUTE MAXIMUM RATINGS (Note 1)
VIN to GND...................................................... – 7V to 7V
VOUT to GND ............................................... – 0.3V to 7V
SW to VOUT .................................................... – 7V to 1V
SW to GND
DC................................................................ –7V to 7V
Pulsed < 100ns............................................ –7V to 8V
SHDN to GND.................................................. – 7V to 7V
FB, SS to GND.............................................. – 0.3V to 7V
Operating Temperature Range
(Notes 3, 4).......................................... –40°C to 85°C
Storage Temperature Range.................. –65°C to 125°C
Lead Temperature (Soldering, 10 sec)
MSOP............................................................... 300°C
PIN CONFIGURATION
TOP VIEW
SHDN 1
8 VC
VIN 2
9
7 FB
SW 3
6 VOUT
GND 4
5 SS
DD PACKAGE
8-LEAD (3mm × 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 45°C
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
TOP VIEW
SHDN 1
VIN 2
SW 3
GND 4
8 VC
7 FB
6 VOUT
5 SS
MS8 PACKAGE
8-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 160°C/W
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3499EDD#PBF
LTC3499EDD#TRPBF
LBRB
8-Lead (3mm × 3mm) Plastic DFN
LTC3499BEDD#PBF
LTC3499BEDD#TRPBF LCDZ
8-Lead (3mm × 3mm) Plastic DFN
LTC3499EMS8#PBF
LTC3499EMS8#TRPBF LTBRC
8-Lead Plastic MSOP
LTC3499BEMS8#PBF
LTC3499BEMS8#TRPBF LTCFB
8-Lead Plastic MSOP
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
–40°C to 85°C
–40°C to 85°C
ELECTRICAL CHARACTERISTICS The l denotes specifications that apply over the full operating temperature
range, otherwise specifications are at TA = 25°C. VIN = 2.4V, VOUT = 5V, SHDN = 2.4V, TA = TJ unless otherwise noted. (Note 3)
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Supply
VIN
Minimum Start-Up Voltage
VOUT
Output Voltage Adjust Range
VFB
FB Voltage
l
1.6
1.8
V
l
2
6
V
l 1.195 1.220 1.245
V
3499fc
2


Part Number LTC3499EMS8
Description 750mA Synchronous Step-Up DC/DC Converters
Maker Linear
PDF Download

LTC3499EMS8 Datasheet PDF






Similar Datasheet

1 LTC3499EMS8 750mA Synchronous Step-Up DC/DC Converters
Linear





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