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LTC1433I Datasheet

  • LTC1433I

  • Linear Technology [450mA, Low Noise Current Mode Step-Down ...

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LTC1433/LTC1434
450mA, Low Noise
Current Mode Step-Down
DC/DC Converters
DESCRIPTION
The LTC
廬
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 0.6鈩?(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
鹵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 470碌A(chǔ) of quiescent current. In shutdown the devices
draw a mere 15碌A(chǔ). 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
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s
High Efficiency: Up to 93%
Constant Frequency Adaptive Power
TM
Operation
Input Voltage Range: 3V to 13.5V
Internal 0.6鈩?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: 470碌A(chǔ)
Shutdown Mode Draws Only 15碌A(chǔ) Supply Current
鹵1%
Reference Accuracy
Available in 16- and 20-Lead Narrow SSOP
APPLICATIONS
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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
0.1碌F
D1
L1
100碌H
1
2
3
4
5
6
0.1碌F
7
8
SSW
NC
BSW
NC
LTC1433
68碌F**
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
+
100碌F*
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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