LTC1871EMS#PBF Linear Technology, LTC1871EMS#PBF Datasheet - Page 19

• Manufacturer Part Number: LTC1871EMS#PBF
• Description: IC CONTRLR CURRENT MODE 10-MSOP
• Manufacturer: Linear Technology
• Type: Step-Up (Boost), Flyback, Sepicr

Specifications of LTC1871EMS#PBF

• Internal Switch(s): No
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 1.23 ~ 72 V
• Current - Output: 50mA
• Frequency - Switching: 50kHz ~ 1MHz
• Voltage - Input: 2.5 ~ 36 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 10-MSOP, Micro10™, 10-uMAX, 10-uSOP
• Input Voltage: 36V
• Output Current: 50mA
• Output Voltage: 12V
• Supply Voltage Range: 2.5V To 36V
• No. Of Pins: 10
• Operating Temperature Range: -40°C To +85°C
• Msl: MSL 1 - Unlimited
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -

APPLICATIONS INFORMATION
Pulse skipping prevents a loss of control of the output at
very light loads and reduces output voltage ripple.
Effi ciency Considerations: How Much Does V
Sensing Help?
The effi ciency of a switching regulator is equal to the out-
put power divided by the input power (×100%). Percent
effi ciency can be expressed as:
where L1, L2, etc. are the individual loss components as a
percentage of the input power. It is often useful to analyze
individual losses to determine what is limiting the effi ciency
% Effi ciency = 100% – (L1 + L2 + L3 + …),
Table 1. Recommended Component Manufacturers
VENDOR
AVX
BH Electronics
Coilcraft
Coiltronics
Diodes, Inc
Fairchild
General Semiconductor
International Rectifi er
IRC
Kemet
Magnetics Inc
Microsemi
Murata-Erie
Nichicon
On Semiconductor
Panasonic
Sanyo
Sumida
Taiyo Yuden
TDK
Thermalloy
Tokin
Toko
United Chemicon
Vishay/Dale
Vishay/Siliconix
Vishay/Sprague
Zetex
Inductors, Transformers
Small-Signal Discretes
Inductors, Capacitors
Capacitors, Inductors
Tantalum Capacitors
MOSFETs, Diodes
Sense Resistors
COMPONENTS
Toroid Cores
DS
Heat Sinks
Capacitors
Capacitors
Capacitors
Capacitors
Capacitors
Capacitors
Capacitors
Capacitors
Inductors
Inductors
MOSFETs
Inductors
Inductors
MOSFETs
Resistors
Diodes
Diodes
Diodes
Diodes
and which change would produce the most improvement.
Although all dissipative elements in the circuit produce
losses, four main sources usually account for the majority
of the losses in LTC1871 application circuits:
1. The supply current into V
of the DC supply current I
acteristics) and the MOSFET driver and control currents.
The DC supply current into the V
550μA and represents a small power loss (much less
than 1%) that increases with V
results from switching the gate capacitance of the power
MOSFET; this current is typically much larger than the
DC current. Each time the MOSFET is switched on and
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[phone]
[phone]
[phone]
[phone]
[phone]
[phone]
[phone]
[phone]
[phone]
[phone]
TELEPHONE
generalsemiconductor.com
nec-tokinamerica.com
aavidthermalloy.com
component.tdk.com
bhelectronics.com
fairchildsemi.com
chemi-com.com
WEB ADDRESS
coiltronics.com
microsemi.com
Q
panasonic.com
IN
mag-inc.com
nichicon.com
avxcorp.com
coilcraft.com
murata.co.jp
t-yuden.com
tokoam.com
onsemi.com
sumida.com
diodes.com
sanyo.co.jp
kemet.com
vishay.com
vishay.com
vishay.com
(given in the Electrical Char-
. The V
zetex.com
irctt.com
irf.com
IN
IN
IN
pin is typically about
. The driver current
current is the sum
LTC1871
19
1871fe