OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

LTC3499BEDD#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
LTC3499/LTC3499B
1
3499fc
TYPICAL APPLICATION
DESCRIPTION
750mA Synchronous
Step-Up DC/DC Converters
with Reverse-Battery Protection
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.
Two AA Cells to 5V Synchronous Boost Converter
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.
FEATURES
APPLICATIONS
n
Medical Equipment
n
Digital Cameras
n
MP3 Players
n
Handheld Instruments
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
4.7µH
3499 TA01
LTC3499
SW
FB
GND
V
IN
V
OUT
SHDN
VC
SS
OFFON
10µF
V
OUT
5V
175mA
V
IN
1.8V TO 3.2V
1M
324k
0.01µF330pF
100k
2.2µF
+
Battery Current vs V
IN
V
IN
AND SW VOLTAGE (V)
–6
–1.0
BATTERY CURRENT (µA)
0
–2 2–4 0 4
3499 TA01b
6
–0.5
1.0
0.5
SHDN = 0V
V
OUT
= 0V
LTC3499/LTC3499B
2
3499fc
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS
V
IN
to GND ..................................................... – 7V to 7V
V
OUT
to GND .............................................. – 0.3V to 7V
SW to V
OUT
................................................... – 7V to 1V
SW to GND
DC ............................................................... –7V to 7V
Pulsed < 100ns ........................................... –7V to 8V
SHDN to GND
................................................. – 7V to 7V
(Note 1)
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3499EDD#PBF LTC3499EDD#TRPBF LBRB
8-Lead (3mm × 3mm) Plastic DFN
–40°C to 85°C
LTC3499BEDD#PBF LTC3499BEDD#TRPBF LCDZ
8-Lead (3mm × 3mm) Plastic DFN
–40°C to 85°C
LTC3499EMS8#PBF LTC3499EMS8#TRPBF LTBRC 8-Lead Plastic MSOP –40°C to 85°C
LTC3499BEMS8#PBF LTC3499BEMS8#TRPBF LTCFB 8-Lead Plastic MSOP –40°C to 85°C
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/
TOP VIEW
DD PACKAGE
8-LEAD (3mm × 3mm) PLASTIC DFN
5
6
7
8
9
4
3
2
1SHDN
V
IN
SW
GND
VC
FB
V
OUT
SS
T
JMAX
= 125°C, θ
JA
= 45°C
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
VC
FB
V
OUT
SS
SHDN
V
IN
SW
GND
1
2
3
4
8
7
6
5
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 125°C, θ
JA
= 160°C/W
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
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Supply
V
IN
Minimum Start-Up Voltage
l
1.6 1.8 V
V
OUT
Output Voltage Adjust Range
l
2 6 V
V
FB
FB Voltage
l
1.195 1.220 1.245 V
The l denotes specifications that apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. V
IN
= 2.4V, V
OUT
= 5V, SHDN = 2.4V, T
A
= T
J
unless otherwise noted. (Note 3)
LTC3499/LTC3499B
3
3499fc
ELECTRICAL CHARACTERISTICS
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: Specification is guaranteed by design and not 100% tested in
production.
Note 3:The LTC3499E/LTC3499BE are guaranteed to meet device
specifications from 0°C to 85°C. Specifications over the –40°C to 85°C
operating temperature are assured by design, characterization and
correlation with statistical process controls.
The l denotes specifications that apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. V
IN
= 2.4V, V
OUT
= 5V, SHDN = 2.4V, T
A
= T
J
unless otherwise noted. (Note 3)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
FB
FB Input Current V
FB
= 1.22V 3 50 nA
I
VIN
V
IN
Quiescent Current No Output Load
l
300 600 µA
I
SD
V
IN
Quiescent Current in Shutdown SHDN = 0V, V
OUT
= 0V 0.1 1 µA
I
BURST
Quiescent Current – Burst Mode Operation V
IN
Current at 2.4V (LTC3499 Only)
V
OUT
Current at 5V (LTC3499 Only)
20
1.5
µA
µA
I
NMOS
NMOS Switch Leakage Current V
SW
= 6V 0.1 5 µA
I
PMOS
PMOS Switch Leakage Current V
OUT
= 6V, V
SW
= 0V 0.1 5 µA
R
NMOS
NMOS Switch On Resistance V
OUT
= 3.3V
V
OUT
= 5V
0.45
0.4
Ω
Ω
R
PMOS
PMOS Switch On Resistance V
OUT
= 3.3V
V
OUT
= 5V
0.58
0.45
Ω
Ω
I
LIM
NMOS Current Limit
l
0.75 1 A
t
DLY, ILIM
Current Limit Delay to Output Note 2 60 ns
D
MAX
Maximum Duty Cycle
l
80 85 %
D
MIN
Minimum Duty Cycle
l
0 %
f
OSC
Frequency Accuracy
l
1 1.2 1.4 MHz
G
mEA
Error Amplifier Transconductance 40 µmhos
I
SOURCE
Error Amplifier Source Current –5 µA
I
SINK
Error Amplifier Sink Current 5 µA
I
SS
SS Current Source V
SS
= 1V –3 µA
V
OV
V
OUT
Overvoltage Threshold 6.8 V
V
OV(HYST)
V
OUT
Overvoltage Hysteresis 400 mV
Shutdown
V
SHDN(LOW)
SHDN Input Low Voltage
l
0.2 V
V
SHDN(HIGH)
SHDN Input High Voltage Measured at SW
l
1.2 V
I
SD
SHDN Input Current 1 µA
Reverse Battery
I
VOUT,REVBATT
V
OUT
Reverse-Battery Current V
OUT
= 0V, V
IN
= V
SHDN
= V
SW
= –6V
l
5 µA
I
VIN,REVBATT
V
IN
and V
SW
Reverse-Battery Current V
OUT
= 0V, V
IN
= V
SHDN
= V
SW
= –6V
l
–5 µA
I
SHDN,REVBATT
SHDN Reverse-Battery Current V
OUT
= 0V, V
IN
= V
SHDN
= V
SW
= –6V
l
–5 µA
Note 4: These ICs include overtemperature protection that is intended
to protect the devices during momentary overload conditions. Junction
temperatures will exceed 125°C when overtemperature protection is
active. Continuous operation above the specified maximum operating
temperature range may impair device reliability.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LTC3499BEDD#PBF

Mfr. #:
Buy LTC3499BEDD#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 750mA, 1.2MHz Synch Boost Conv w/ Reverse Battery Protection in DFN
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet