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LTC1624CS8

Description
High Efficiency SO-8 N-Channel Switching Regulator Controller
CategoryPower/power management    The power supply circuit   
File Size361KB,28 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet Parametric Compare View All

LTC1624CS8 Overview

High Efficiency SO-8 N-Channel Switching Regulator Controller

LTC1624CS8 Parametric

Parameter NameAttribute value
Brand NameLinear Technology
Is it Rohs certified?incompatible
MakerLinear ( ADI )
Parts packaging codeSOIC
package instructionSOP, SOP8,.25
Contacts8
Manufacturer packaging codeS8
Reach Compliance Codenot_compliant
ECCN codeEAR99
Analog Integrated Circuits - Other TypesSWITCHING CONTROLLER
control modeCURRENT-MODE
Maximum input voltage36 V
Minimum input voltage3.5 V
Nominal input voltage15 V
JESD-30 codeR-PDSO-G8
JESD-609 codee0
length4.9 mm
Humidity sensitivity level1
Number of functions1
Number of terminals8
Maximum operating temperature70 °C
Minimum operating temperature
Maximum output voltage30 V
Minimum output voltage1.9 V
Package body materialPLASTIC/EPOXY
encapsulated codeSOP
Encapsulate equivalent codeSOP8,.25
Package shapeRECTANGULAR
Package formSMALL OUTLINE
Peak Reflow Temperature (Celsius)235
Certification statusNot Qualified
Maximum seat height1.752 mm
surface mountYES
Switch configurationSINGLE
Maximum switching frequency225 kHz
technologyCMOS
Temperature levelCOMMERCIAL
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formGULL WING
Terminal pitch1.27 mm
Terminal locationDUAL
Maximum time at peak reflow temperature20
width3.9 mm
Base Number Matches1
LTC1624
High Efficiency SO-8
N-Channel Switching
Regulator Controller
FEATURES
s
s
DESCRIPTION
The LTC
®
1624 is a current mode switching regulator
controller that drives an external N-channel power MOSFET
using a fixed frequency architecture. It can be operated in
all standard switching configurations including boost,
step-down, inverting and SEPIC. Burst Mode
TM
operation
provides high efficiency at low load currents. A maximum
high duty cycle limit of 95% provides low dropout operation
which extends operating time in battery-operated systems.
The operating frequency is internally set to 200kHz, allowing
small inductor values and minimizing PC board space. The
operating current level is user-programmable via an external
current sense resistor. Wide input supply range allows
operation from 3.5V to 36V (absolute maximum).
A multifunction pin (I
TH
/ RUN) allows external
compensation for optimum load step response plus
shutdown. Soft start can also be implemented with the
I
TH
/RUN pin to properly sequence supplies.
s
s
s
s
s
s
s
s
s
s
s
s
N-Channel MOSFET Drive
Implements Boost, Step-Down, SEPIC
and Inverting Regulators
Wide V
IN
Range: 3.5V to 36V Operation
Wide V
OUT
Range: 1.19V to 30V in Step-Down
Configuration
±
1% 1.19V Reference
Low Dropout Operation: 95% Duty Cycle
200kHz Fixed Frequency
Low Standby Current
Very High Efficiency
Remote Output Voltage Sense
Logic-Controlled Micropower Shutdown
Internal Diode for Bootstrapped Gate Drive
Current Mode Operation for Excellent Line and
Load Transient Response
Available in an 8-Lead SO Package
APPLICATIONS
s
s
s
s
s
Notebook and Palmtop Computers, PDAs
Cellular Telephones and Wireless Modems
Battery-Operated Digital Devices
DC Power Distribution Systems
Battery Chargers
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
TYPICAL APPLICATION
1000pF
SENSE
I
TH
/RUN
V
FB
100pF
GND
SW
V
IN
BOOST
TG
V
IN
4.8V TO 28V
R
SENSE
0.05Ω
M1
Si4412DY
C
B
0.1µF
D1
MBRS340T3
L1
10µH
C
C
470pF
R
C
6.8k
LTC1624
R2
35.7k
R1
20k
Figure 1. High Efficiency Step-Down Converter
U
U
U
+
C
IN
22µF
35V
×
2
V
OUT
3.3V
2A
+
C
OUT
100µF
10V
×
2
1624 F01
1

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