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LTC3872-1 Datasheet(PDF) 1 Page - Linear Technology

Part # LTC3872-1
Description  No RSENSE Current Mode Boost DC/DC Controller
Download  20 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3872-1 Datasheet(HTML) 1 Page - Linear Technology

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LTC3872-1
1
38721f
For more information www.linear.com/LTC3872-1
No RSENSE
Current Mode Boost
DC/DC Controller
High Efficiency 3.3V Input, 5V Output Boost Converter
Efficiency and Power Loss vs Load Current
LOAD CURRENT (mA)
30
90
100
10
0.001
20
10
80
50
70
60
40
1
100
1000
10000
38721 TA01b
0
10
1
0.1
0.01
Typical applicaTion
FeaTures
DescripTion
applicaTions
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.
n
Telecom Power Supplies
n
42V Automotive Systems
n
24V Industrial Controls
n
IP Phone Power Supplies
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
ITH
IPRG
GND
VFB
VIN
SW
NGATE
LTC3872-1
38721 TA01
RUN/SS
17.4k
VIN
11k
1%
34.8k
1%
1nF
M1
D1
10µF
100µF
×2
1.8nF
47pF
1µH
VIN
3.3V
VOUT
5V
2A


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