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LTC1434CGN

Description
450mA, Low Noise Current Mode Step-Down DC/DC Converters
CategoryPower/power management    The power supply circuit   
File Size290KB,20 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet Parametric Compare View All

LTC1434CGN Overview

450mA, Low Noise Current Mode Step-Down DC/DC Converters

LTC1434CGN Parametric

Parameter NameAttribute value
Brand NameLinear Technology
Is it Rohs certified?incompatible
MakerLinear ( ADI )
Parts packaging codeSSOP
package instructionSSOP, SSOP20,.25
Contacts20
Manufacturer packaging codeGN
Reach Compliance Codenot_compliant
ECCN codeEAR99
Other featuresALSO OPERATES AT 5V
Analog Integrated Circuits - Other TypesSWITCHING REGULATOR
control modeCURRENT-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage13.5 V
Minimum input voltage3 V
Nominal input voltage10 V
JESD-30 codeR-PDSO-G20
JESD-609 codee0
length8.65 mm
Humidity sensitivity level1
Number of functions1
Number of terminals20
Maximum operating temperature70 °C
Minimum operating temperature
Maximum output current1.2 A
Nominal output voltage3.3 V
Package body materialPLASTIC/EPOXY
encapsulated codeSSOP
Encapsulate equivalent codeSSOP20,.25
Package shapeRECTANGULAR
Package formSMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius)235
Certification statusNot Qualified
Maximum seat height1.75 mm
surface mountYES
Switch configurationBUCK
Maximum switching frequency700 kHz
technologyCMOS
Temperature levelCOMMERCIAL
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formGULL WING
Terminal pitch0.635 mm
Terminal locationDUAL
Maximum time at peak reflow temperature20
width3.9 mm
Base Number Matches1
LTC1433/LTC1434
450mA, Low Noise
Current Mode Step-Down
DC/DC Converters
DESCRIPTION
The LTC
®
1433/LTC1434 are monolithic pulse width modu-
lated step-down DC/DC converters. By utilizing current
mode switching techniques, they provide excellent AC and
DC load and line regulation. Both devices operate at a fixed
frequency with the LTC1434 phase-lockable to an external
clock signal.
Both devices incorporate two internal P-channel power
MOSFETs with a parallel combined resistance of 0.6Ω (at
a supply of 10V). The Adaptive Power output stage selec-
tively drives one or both of the switches at frequencies up
to 700kHz to reduce switching losses and maintain high
efficiencies at low output currents.
The LTC1433/LTC1434 are capable of supplying up to
450mA of output current and boasts a
±2.4%
output
voltage accuracy. An internal low-battery detector has the
same level of accuracy as the output voltage. A power-on
reset timer (POR) is included which generates a signal
delayed by 65536/f
CLK
(300ms typ) after the output is
within 5% of the regulated output voltage.
Ideal for current sensitive applications, the devices draw
only 470µA of quiescent current. In shutdown the devices
draw a mere 15µA. To further maximize the life of the
battery source, the internal P-channel MOSFET switch is
turned on continuously in dropout.
FEATURES
s
s
s
s
s
s
s
s
s
s
s
s
High Efficiency: Up to 93%
Constant Frequency Adaptive Power
TM
Operation
Input Voltage Range: 3V to 13.5V
Internal 0.6Ω Power Switch (V
IN
= 10V)
Low Dropout Operation: 100% Duty Cycle
Low-Battery Detector
Internal Power-On Reset Timer
Current Mode Operation for Excellent Line and Load
Transient Response
Low Quiescent Current: 470µA
Shutdown Mode Draws Only 15µA Supply Current
±1%
Reference Accuracy
Available in 16- and 20-Lead Narrow SSOP
APPLICATIONS
s
s
s
s
s
s
s
Cellular Telephones
Portable Instruments
Wireless Modems
RF Communications
Distributed Power Systems
Scanners
Battery-Powered Equipment
, LTC and LT are registered trademarks of Linear Technology Corporation.
Adaptive Power is a trademark of Linear Technology Corporation.
TYPICAL APPLICATION
0.1µF
D1
L1
100µH
1
2
3
4
5
6
0.1µF
7
8
SSW
NC
BSW
NC
LTC1433
68µF**
20V
100
16
PWRV
IN
PGND 15
SV
IN
C
OSC
POR
I
TH
V
OSENSE
V
PROG
14
13
12
11
10
9
6800pF
D1: MOTOROLA MBRS130LT3 *AVX TPSD107M010R0100
** AVX TPSE686M020R0150
L1: COILCRAFT D03316-104
1433/34 F01
V
IN
3.5V TO 12V
90
+
100µF*
10V
EFFICIENCY (%)
V
OUT
3.3V
10k
80
70
V
IN
= 9V
60
50
40
0.001
SGND
RUN/SS
LBO
LBI
POWER-ON
RESET
5.1k
680pF
47pF
Figure 1. High Efficiency Step-Down Converter
U
U
U
LTC1433 Efficiency for
V
OUT
= 3.3V
V
IN
= 5V
V
IN
= 12V
+
0.01
0.1
LOAD CURRENT (A)
1
1433/34 TA01
1

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