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Linear Technology Electronic Components Datasheet

LTC3872ETS8-1 Datasheet

Boost DC/DC Controller

No Preview Available !

LTC3872-1
No RSENSE
Current Mode Boost
DC/DC Controller
Features
n No Current Sense Resistor Required
n VOUT up to 60V
n Constant Frequency 550kHz Operation
n Internal Soft-Start and Optional External Soft-Start
n Adjustable Current Limit
n Pulse Skipping at Light Load
n VIN Range: 2.75V to 9.8V
n ±1.5% Voltage Reference Accuracy
n Current Mode Operation for Excellent Line and Load
Transient Response
n Low Profile (1mm) SOT-23 and 2mm × 3mm DFN
Packages
Applications
n Telecom Power Supplies
n 42V Automotive Systems
n 24V Industrial Controls
n IP Phone Power Supplies
Description
The LTC®3872-1 is a constant frequency current mode
boost DC/DC controller that drives an N-channel power
MOSFET and requires very few external components. The
No RSENSETM architecture eliminates the need for a sense
resistor, improves efficiency and saves board space.
The LTC3872-1 provides excellent AC and DC load and
line regulation with ±1.5% output voltage accuracy. It
incorporates an undervoltage lockout feature that shuts
down the device when the input voltage falls below 2.3V.
LTC3872-1 has the same functionality as the standard
LTC3872 except that it has no frequency foldback in cur-
rent limit.
High switching frequency of 550kHz allows the use of a
small inductor. The LTC3872-1 is available in an 8-lead
low profile (1mm) ThinSOTTM package and 8-pin 2mm ×
3mm DFN package.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
No RSENSE and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners.
Typical Application
High Efficiency 3.3V Input, 5V Output Boost Converter
1.8nF 17.4k
ITH
VIN
47pF VIN
IPRG
LTC3872-1
GND
SW
VFB RUN/SS NGATE
11k
1%
1nF
34.8k
1%
1µH
D1
M1 100µF
×2
VIN
3.3V
10µF
VOUT
5V
2A
38721 TA01
Efficiency and Power Loss vs Load Current
100
90
80
70
60
50
40
30
20
10
0
1
10
1
0.1
0.01
10
100
1000
LOAD CURRENT (mA)
0.001
10000
38721 TA01b
For more information www.linear.com/LTC3872-1
38721f
1


Linear Technology Electronic Components Datasheet

LTC3872ETS8-1 Datasheet

Boost DC/DC Controller

No Preview Available !

LTC3872-1
Absolute Maximum Ratings (Note 1)
Input Supply Voltage (VIN), RUN/SS........... –0.3V to 10V
IPRG Voltage.................................. –0.3V to (VIN + 0.3V)
VFB, ITH Voltages........................................ –0.3V to 2.4V
SW Voltage................................................. –0.3V to 60V
Operating Junction Temperature Range
(Notes 2, 3)............................................. –40°C to 150°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
TS8 Package.......................................................... 300°C
Pin Configuration
TOP VIEW
IPRG 1
ITH 2
VFB 3
GND 4
8 SW
7 RUN/SS
6 VIN
5 NGATE
TS8 PACKAGE
8-LEAD PLASTIC TSOT-23
TJMAX = 150°C, θJA = 195°C/W
TOP VIEW
GND 1
8 NGATE
VFB 2
9
7 VIN
ITH 3
6 RUN/SS
IPRG 4
5 SW
DDB PACKAGE
8-LEAD (3mm × 2mm) PLASTIC DFN
TJMAX = 150°C, θJA = 76°C/W
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3872ETS8-1#PBF
LTC3872ETS8-1#TRPBF LTCFN
8-Lead Plastic TSOT-23
–40°C to 85°C
LTC3872ITS8-1#PBF
LTC3872ITS8-1#TRPBF LTCFN
8-Lead Plastic TSOT-23
–40°C to 125°C
LTC3872HTS8-1#PBF
LTC3872HTS8-1#TRPBF LTCFN
8-Lead Plastic TSOT-23
–40°C to 150°C
LTC3872EDDB-1#PBF
LTC3872EDDB-1#TRPBF LCFK
8-Lead (3mm × 2mm) Plastic DFN
–40°C to 85°C
LTC3872IDDB-1#PBF
LTC3872IDDB-1#TRPBF LCFK
8-Lead (3mm × 2mm) Plastic DFN
–40°C to 125°C
LTC3872HDDB-1#PBF
LTC3872HDDB-1#TRPBF LCFK
8-Lead (3mm × 2mm) Plastic DFN
–40°C to 150°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 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/
38721f
2
For more information www.linear.com/LTC3872-1


Part Number LTC3872ETS8-1
Description Boost DC/DC Controller
Maker Linear Technology
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