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Linear Technology Electronic Components Datasheet

LTC3410BESC6-1.2 Datasheet

300mA Synchronous Step-Down Regulator

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FEATURES
High Efficiency: Up to 96%
300mA Output Current at VIN = 3V
380mA Minimum Peak Switch Current
2.5V to 5.5V Input Voltage Range
2.25MHz Constant Frequency Operation
No Schottky Diode Required
Low Dropout Operation: 100% Duty Cycle
Stable with Ceramic Capacitors
0.8V Reference Allows Low Output Voltages
Shutdown Mode Draws < 1µA Supply Current
±2% Output Voltage Accuracy
Current Mode Operation for Excellent Line and
Load Transient Response
Overtemperature Protected
Available in Low Profile SC70 Package
U
APPLICATIO S
Cellular Telephones
Personal Information Appliances
Wireless and DSL Modems
Digital Still Cameras
MP3 Players
Portable Instruments
LTC3410B
2.25MHz, 300mA
Synchronous Step-Down
Regulator in SC70
DESCRIPTIO
The LTC®3410B is a high efficiency monolithic synchro-
nous buck regulator using a constant frequency, current
mode architecture. The device is available in adjustable
and fixed output voltage versions. Supply current during
operation is only 200µA, dropping to <1µA in shutdown.
The 2.5V to 5.5V input voltage range makes the LTC3410B
ideally suited for single Li-Ion battery-powered applica-
tions. 100% duty cycle provides low dropout operation,
extending battery life in portable systems. PWM pulse
skipping mode operation provides very low output ripple
voltage for noise sensitive applications.
Switching frequency is internally set at 2.25MHz, allowing
the use of small surface mount inductors and capacitors.
The LTC3410B is specifically designed to work well with
ceramic output capacitors, achieving very low output
voltage ripple and a small PCB footprint.
The internal synchronous switch increases efficiency and
eliminates the need for an external Schottky diode. Low
output voltages are easily supported with the 0.8V feed-
back reference voltage. The LTC3410B is available in a
tiny, low profile SC70 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, 5994885, 6580258, 6304066, 6127815, 6498466, 6611131.
TYPICAL APPLICATIO
VIN
2.7V
TO 5.5V
CIN
2.2µF
CER
VIN
SW
LTC3410B
RUN
VFB
GND
4.7µH
10pF
232k
464k
3410 TA01
VOUT
1.2V
COUT
2.2µF
CER
100
90
80
70
60
50
40
30
20
20
0
1
Efficiency and Power Loss
vs Output Current
1
EFFICIENCY
0.1
0.01
POWER LOSS
0.001
VIN = 2.7V
VIN = 3.6V
VIN = 4.2V 0.0001
10
100
1000
OUTPUT CURRENT (mA)
3410 TA01b
3410bfa
1


Linear Technology Electronic Components Datasheet

LTC3410BESC6-1.2 Datasheet

300mA Synchronous Step-Down Regulator

No Preview Available !

LTC3410B
ABSOLUTE AXI U RATI GS (Note 1)
Input Supply Voltage .................................. – 0.3V to 6V
RUN, VFB Voltages ..................................... – 0.3V to VIN
SW Voltage (DC) ......................... – 0.3V to (VIN + 0.3V)
P-Channel Switch Source Current (DC) ............. 500mA
N-Channel Switch Sink Current (DC) ................. 500mA
Peak SW Sink and Source Current .................... 630mA
Operating Temperature Range (Note 2) .. – 40°C to 85°C
Junction Temperature (Note 3) ............................ 125°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
RUN 1
GND 2
SW 3
6 VFB
5 GND
4 VIN
SC6 PACKAGE
6-LEAD PLASTIC SC70
TJMAX = 125°C, θJA = 250°C/ W
ORDER PART NUMBER
LTC3410BESC6
SC6 PART MARKING
LBZY
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.
TOP VIEW
RUN 1
GND 2
SW 3
6 VOUT
5 GND
4 VIN
SC6 PACKAGE
6-LEAD PLASTIC SC70
TJMAX = 125°C, θJA = 250°C/ W
ORDER PART NUMBER
LTC3410BESC6-1.2
LTC3410BESC6-1.5
LTC3410BESC6-1.8
LTC3410BESC6-1.875
SC6 PART MARKING
LCMX
LCMY
LCMZ
LCHZ
ELECTRICAL CHARACTERISTICS
The denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C.
VIN = 3.6V unless otherwise specified.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
IVFB
Feedback Current
Adjustable Output Voltage
IVOUT
Output Voltage Feedback Current Fixed Output Voltage
IPK
Peak Inductor Current
VIN = 3V, VFB = 0.7V or VOUT = 90%, Duty Cycle < 35%
VFB
Regulated Feedback Voltage
Adjustable Output Voltage (LTC3410BE)
VFB
Reference Voltage Line Regulation VIN = 2.5V to 5.5V
VOUT
Regulated Output Voltage
LTC3410B-1.2, IOUT = 100mA
LTC3410B-1.5, IOUT = 100mA
LTC3410B-1.8, IOUT = 100mA
LTC3410B-1.875, IOUT = 100mA
VOUT Output Voltage Line Regulation VIN = 2.5V to 5.5V
VLOADREG Output Voltage Load Regulation ILOAD = 50mA to 250mA
VIN
Input Voltage Range
VUVLO
Undervoltage Lockout Threshold
VIN Rising
VIN Falling
380
0.784
1.176
1.47
1.764
1.837
2.5
3.3
490
0.8
0.04
1.2
1.5
1.8
1.875
0.04
0.5
2.0
1.94
±30
6
600
0.816
0.4
1.224
1.53
1.836
1.913
0.4
5.5
2.3
2
UNITS
nA
µA
mA
V
%/V
V
V
V
V
%/V
%
V
V
V
3410bfa


Part Number LTC3410BESC6-1.2
Description 300mA Synchronous Step-Down Regulator
Maker Linear
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LTC3410BESC6-1.2 Datasheet PDF






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