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LTC3255EMSE#TRPBF

Description
IC REG SWITCHD CAP ADJ 10-MSOP
Categorysemiconductor    Power management   
File Size379KB,8 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Environmental Compliance
Download Datasheet Parametric View All

LTC3255EMSE#TRPBF Overview

IC REG SWITCHD CAP ADJ 10-MSOP

LTC3255EMSE#TRPBF Parametric

Parameter NameAttribute value
Functionstep down
Output configurationjust
Topologycharge pump
Output typeAdjustable
Number of outputs1
Voltage - Input (minimum)4V
Voltage - input (maximum)48V
Voltage - Output (minimum/fixed)2.4V
Voltage - Output (maximum)12.5V
Current - Output50mA
Frequency - Switch500kHz
Synchronous rectifiernone
Operating temperature-55°C ~ 150°C(TJ)
Installation typesurface mount
Package/casing10-TFSOP, 10-MSOP (0.118", 3.00mm wide) exposed pad
Supplier device packaging10-MSOP-EP
DEMO MANUAL DC2041A
LTC3255EMSE
Wide V
IN
Range Fault Protected
50mA Step-Down Charge Pump
Description
Demonstration circuit 2041A is a switched-capacitor
step-down power supply featuring the
LTC
®
3255.
The
LTC3255 has the ability to step down voltage 2:1 to ef-
ficiently regulate output voltages less than half the V
IN
voltage reducing the input current needed. As V
IN
reduces
below twice V
OUT
, the LTC3255 will automatically switch
to 1:1 mode.
The LTC3255 also has an integrated shunt regulator al-
lowing it to provide a regulated output from a 4mA to
20mA current loop.
The LTC3255 is a robust device that can survive reverse-
polarity input supplies with current limit and overtem-
perature protection.
Refer to the LTC3255 data sheet for more details on the
electrical and timing specifications.
Design files for this circuit board are available at
http://www.linear.com/demo
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
performance summary
PARAMETER
Input Supply Range
V
OUT
I
OUT
Specifications are at T
A
= 25°C
MIN
4
2.4
TYP
MAX
48
12.5
7.8
UNITS
V
V
mA
mA
CONDITIONS
Shunt Jumper = OFF (SHUNT = GND)
Shunt Jumper = ON (SHUNT = BIAS) I
IN
= 4mA
50
7.4
7.4mA DC Supply from 4mA to 20mA Current Loop
1µF
AVAILABLE OUTPUT CURRENT (mA)
40
37
34
31
28
25
22
19
16
13
10
7
4
4
6
C
OUTPUT
3.3V
7.4mA
Available Output Current
vs Input Current
+
4mA TO 20mA INPUT
>10V COMPLIANCE
V
IN
EN
1µF
C
+
V
OUT
220k
PGOOD
2.15M
LTC3255
PGOOD
SHUNT
BIAS
GND
FB
0.1µF
10µF
AVAILABLE
I
OUT
INCREASED
I
OUT
CAPABILITY
1.21M
DC2041A F01
INPUT
CURRENT
10 12 14 16
8
INPUT CURRENT (mA)
18
20
DC2041A F02
dc2041af
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