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Linear Technology Electronic Components Datasheet

LTC3805MPMSE-5 Datasheet

Flyback DC/DC Controller

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LTC3805-5
FEATURES
Adjustable Frequency
Current Mode Flyback/
Boost/SEPIC DC/DC Controller
DESCRIPTION
n VIN and VOUT Limited Only by External Components
n 4.5V Undervoltage Lockout Threshold
n Adjustable Slope Compensation
n Adjustable Overcurrent Protection with Automatic
Restart
n Adjustable Operating Frequency (70kHz to 700kHz)
With One External Resistor
n Synchronizable to an External Clock
n ±1.5% Reference Accuracy
n Only 100mV Current Sense Voltage Drop
n RUN Pin with Precision Threshold and Adjustable
Hysteresis
n Programmable Soft-Start with One External Capacitor
n Low Quiescent Current: 360µA
n Small 10-Lead MSOP and 3mm × 3mm DFN
APPLICATIONS
n Automotive Power Supplies
n Telecom Power Supplies
n Isolated Electronic Equipment
n Auxiliary/Housekeeping Power Supplies
n Power over Ethernet
The LTC®3805-5 is a current mode DC/DC controller de-
signed to drive an N-channel MOSFET in flyback, boost
and SEPIC converter applications. Operating frequency
and slope compensation can be programmed by external
resistors. Programmable overcurrent sensing protects
the converter from overload and short-circuit conditions.
Soft-start can be programmed using an external capacitor
and the soft-start capacitor also programs an automatic
restart feature.
The LTC3805-5 provides ±1.5% output voltage accuracy
and consumes only 360µA of quiescent current during
normal operation and only 40µA during micropower start-
up. Using a 9.5V internal shunt regulator, the LTC3805-5
can be powered from a high VIN through a resistor or it
can be powered directly from a low impedance DC voltage
from 4.7V to 8.8V.
The LTC3805-5 is available in the 10-lead MSOP package
and the 3mm × 3mm DFN package.
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered
trademarks, No RSENSE and ThinSOT are trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
5V to 12V/1A Boost Converter
VIN
5V
20k
470pF
4.3µH
22µF
×2
0.1µF
VCC
RUN
GATE
LTC3805-5
ITH
OC
SSFLT
ISENSE
FS
FB
118k SYNC GND
1.33k
3k
UPS840
VOUT
12V
100µF 1A
191k
8mΩ
13.7k
38055 TA01a
Efficiency and Power Loss vs Load Current
100
2.5
95
5V EFFICIENCY
2.0
8.5V EFFICIENCY
90
1.5
8.5V LOSS
5V LOSS
85
1
80
0.5
75
0.01
0.1
1
LOAD CURRENT (A)
0
10
38055TA01b
38055fe
1


Linear Technology Electronic Components Datasheet

LTC3805MPMSE-5 Datasheet

Flyback DC/DC Controller

No Preview Available !

LTC3805-5
ABSOLUTE MAXIMUM RATINGS (Note 1)
VCC to GND
Low Impedance Source......................... –0.3V to 8.8V
Current Fed.........................................25mA into VCC*
SYNC............................................................ –0.3V to 6V
SSFLT........................................................... –0.3V to 5V
FB, ITH, FS.................................................. –0.3V to 3.5V
RUN............................................................ –0.3V to 18V
OC, ISENSE..................................................... –0.3V to 1V
Operating Junction Temperature Range
(Notes 2, 3) ............................................ –55°C to 150°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
MSE Package..................................................... 300°C
*LTC3805-5 internal clamp circuit regulates VCC voltage to 9.5V
PIN CONFIGURATION
TOP VIEW
SSFLT 1
ITH 2
FB 3
RUN 4
FS 5
10 GATE
9 VCC
11
8 OC
7 ISENSE
6 SYNC
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 45°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE CONNECTED TO GND
SSFLT 1
ITH 2
FB 3
RUN 4
FS 5
TOP VIEW
11
10 GATE
9 VCC
8 OC
7 ISENSE
6 SYNC
MSE PACKAGE
10-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 45°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE CONNECTED TO GND
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING* PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3805EMSE-5#PBF
LTC3805EMSE-5#TRPBF LTDGX
10-Lead Plastic MSOP
–40°C to 85°C
LTC3805IMSE-5#PBF
LTC3805IMSE-5#TRPBF LTDGX
10-Lead Plastic MSOP
–40°C to 125°C
LTC3805HMSE-5#PBF
LTC3805HMSE-5#TRPBF LTDGX
10-Lead Plastic MSOP
–40°C to 150°C
LTC3805MPMSE-5#PBF LTC3805MPMSE-5#TRPBF LTDGX
10-Lead Plastic MSOP
–55°C to 150°C
LTC3805EDD-5#PBF
LTC3805EDD-5#TRPBF
LDHB
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 85°C
LTC3805IDD-5#PBF
LTC3805IDD-5#TRPBF
LDHB
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on 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/
38055fe
2


Part Number LTC3805MPMSE-5
Description Flyback DC/DC Controller
Maker Linear Technology
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LTC3805MPMSE-5 Datasheet PDF






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