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Datasheet> All Categories > Development board/suite/development tools> DC1956A
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DC1956A

Description
board eval for lt3905
CategoryDevelopment board/suite/development tools   
File Size166KB，6 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Environmental Compliance  
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board eval for lt3905

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DEMO MANUAL DC1956A
LT3905
Boost DC/DC Converter with
APD Current Monitor
Description
Demonstration circuit 1956A features the
LT
®
3905,
a boost
DC/DC Converter with APD current monitor that comes in
a 3mm × 3mm QFN package. This demo board is designed
to convert a 2.7V to 12V input to a 50V output at 2mA. The
LT3905 is equipped with indicators for monitoring APD
current, overload, and loss-of-signal (LOS) conditions,
which can easily be changed with their respective resis-
tors. In addition, the output voltage can be adjusted via the
CTRL pin. DC1956A is designed for 1MHz operation but
can also be programmed for 2MHz by moving jumper JP2.
For measuring fast transient response, use the installed
Fast Monitor Response Circuit on the bottom of the demo
board and install 0Ω resistors at R14 and R20. Also, remove
R11 and any other capacitances or probes across the APD
node. The transient response should be measured at the
TIA turret. For further information, read the APD Current
Monitor Transient Response section in the data sheet.
The internal LOS_MON comparator hysteresis is 20mV on
the rising edge of the LOS_MON voltage. For additional
hysteresis, use R6, R7, R15, and R21 as stated in the Loss
of Signal Hysteresis section in the data sheet.
The LT3905 data sheet gives a complete description of
the part, operation, and application information. The data
sheet must be read in conjunction with this Quick Start
Guide for the DC1956A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1956A
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.
100
V
APD
= 50V
80
INPUT CURRENT (mA)
60
40
20
V
IN
= 3.3V
V
IN
= 5V
0
0.5
1
I
APD
(mA)
1.5
2
DC1956A F01
0
Figure 1. DC1956A Input Current vs APD Current
performance summary
SYMBOL
V
IN
V
OUT
f
SW
I
LOS
I
LIM
V
MON
/I
APD
PARAMETER
Input Supply Range
Output Voltage Range
Switching Frequency
Loss-of-Signal APD Current
APD Current Limit
MON Voltage to APD Current Ratio
Specifications are at T
A
= 25°C
CONDITIONS
V
IN
= 3.3V, I
APD
= 1mA
JP2: 1MHz
R10 = 1MΩ
R8 = 12.4kΩ
R11 = 4.99kΩ
MIN
2.7
48
0.9
50
1
12.5
2
1
TYP
MAX
12
52
1.1
UNITS
V
V
MHz
µA
mA
mV/µA
dc1956afa
1

DC1956A Related Products

DC1956A LT3905EUD#PBF LT3905EUD#TRPBF LT3905IUD#PBF LT3905IUD#TRPBF
Description board eval for lt3905 IC REG BOOST ADJ 0.35A 16QFN IC REG BOOST ADJ 0.35A 16QFN IC REG BOOST ADJ 0.35A 16QFN IC REG BOOST ADJ 0.35A 16QFN
Brand Name - Linear Technology Linear Technology Linear Technology Linear Technology
Is it Rohs certified? - conform to conform to conform to conform to
Maker - Linear ( ADI ) Linear ( ADI ) Linear ( ADI ) Linear ( ADI )
Parts packaging code - QFN QFN QFN QFN
package instruction - HVQCCN, HVQCCN, HVQCCN, HVQCCN,
Contacts - 16 16 16 16
Manufacturer packaging code - UD UD UD UD
Reach Compliance Code - compliant compliant compliant compliant
ECCN code - EAR99 EAR99 EAR99 EAR99
Other features - ALSO OPERATES IN ADJUSTABLE MODE ALSO OPERATES IN ADJUSTABLE MODE ALSO OPERATES IN ADJUSTABLE MODE ALSO OPERATES IN ADJUSTABLE MODE
Analog Integrated Circuits - Other Types - SWITCHING REGULATOR SWITCHING REGULATOR SWITCHING REGULATOR SWITCHING REGULATOR
control mode - CURRENT-MODE CURRENT-MODE CURRENT-MODE CURRENT-MODE
Control Technology - PULSE WIDTH MODULATION PULSE WIDTH MODULATION PULSE WIDTH MODULATION PULSE WIDTH MODULATION
Maximum input voltage - 12 V 12 V 12 V 12 V
Minimum input voltage - 2.7 V 2.7 V 2.7 V 2.7 V
Nominal input voltage - 3.3 V 3.3 V 3.3 V 3.3 V
JESD-30 code - S-PQCC-N16 S-PQCC-N16 S-PQCC-N16 S-PQCC-N16
JESD-609 code - e3 e3 e3 e3
length - 3 mm 3 mm 3 mm 3 mm
Number of functions - 1 1 1 1
Number of terminals - 16 16 16 16
Maximum operating temperature - 125 °C 125 °C 125 °C 125 °C
Maximum output current - 0.45 A 0.45 A 0.45 A 0.45 A
Package body material - PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY
encapsulated code - HVQCCN HVQCCN HVQCCN HVQCCN
Package shape - SQUARE SQUARE SQUARE SQUARE
Package form - CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
Peak Reflow Temperature (Celsius) - NOT SPECIFIED NOT SPECIFIED NOT SPECIFIED NOT SPECIFIED
Maximum seat height - 0.8 mm 0.8 mm 0.8 mm 0.8 mm
surface mount - YES YES YES YES
Switch configuration - BOOST BOOST BOOST BOOST
Maximum switching frequency - 2200 kHz 2200 kHz 2200 kHz 2200 kHz
Temperature level - OTHER OTHER AUTOMOTIVE AUTOMOTIVE
Terminal surface - Matte Tin (Sn) Matte Tin (Sn) Matte Tin (Sn) Matte Tin (Sn)
Terminal form - NO LEAD NO LEAD NO LEAD NO LEAD
Terminal pitch - 0.5 mm 0.5 mm 0.5 mm 0.5 mm
Terminal location - QUAD QUAD QUAD QUAD
Maximum time at peak reflow temperature - NOT SPECIFIED NOT SPECIFIED NOT SPECIFIED NOT SPECIFIED
width - 3 mm 3 mm 3 mm 3 mm

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