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LTC1439CGW Datasheet(PDF) 1 Page - Linear Technology

Part # LTC1439CGW
Description  Dual High Efficiency, Low Noise, Synchronous Step-Down Switching Regulators
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1439CGW Datasheet(HTML) 1 Page - Linear Technology

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1
LTC1438/LTC1439
Dual High Efficiency,
Low Noise, Synchronous
Step-Down Switching Regulators
Figure 1. High Efficiency Dual 5V/3V Step-Down Converter
s
Maintains Constant Frequency at Low Output Currents
s
Dual N-Channel MOSFET Synchronous Drive
s
Programmable Fixed Frequency (PLL Lockable)
s
Wide VIN Range: 3.5V to 36V Operation
s
Ultrahigh Efficiency
s
Very Low Dropout Operation: 99% Duty Cycle
s
Low Dropout, 0.5A Linear Regulator for VPP
Generation or Low Noise Audio Supply
s
Built-In Power-On Reset Timer
s
Programmable Soft Start
s
Low-Battery Detector
s
Remote Output Voltage Sense
s
Foldback Current Limiting (Optional)
s
Pin Selectable Output Voltage
s
Logic-Controlled Micropower Shutdown: IQ < 30µA
s
Output Voltages from 1.19V to 9V
s
Available in 28- and 36-Lead SSOP Packages
The LTC
®1438/LTC1439 are dual, synchronous step-
down switching regulator controllers which drive external
N-channel power MOSFETs in a phase-lockable fixed
frequency architecture. The Adaptive Power
TM output stage
selectively drives two N-channel MOSFETs at frequencies
up to 400kHz while reducing switching losses to maintain
high efficiencies at low output currents.
An auxiliary 0.5A linear regulator using an external PNP
pass device provides a low noise, low dropout voltage
source. A secondary winding feedback control pin (SFB1)
guarantees regulation regardless of load on the main
output by forcing continuous operation.
An additional comparator is available for use as a low
battery detector. A power-on reset timer (POR) is included
which generates a signal delayed by 65536/fCLK (typ
300ms) after the output is within 5% of the regulated
output voltage. Internal resistive dividers provide pin
selectable output voltages with remote sense capability on
one of the two outputs.
The operating current levels are user-programmable via
external current sense resistors. Wide input supply range
allows operation from 3.5V to 30V (36V maximum).
FEATURES
DESCRIPTION
, LTC and LT are registered trademarks of Linear Technology Corporation.
Adaptive Power is a trademark of Linear Technology Corporation.
TYPICAL APPLICATION
BOOST 2
BOOST 1
TGL2
TGS2
SW2
BG2
SENSE+ 2
SENSE2
VOSENSE2
ITH2
TGL1
M3*
M1
M2
TGS1
D1
MBR140T3
VOUT1
5V
3.5A
VOUT2
3.3V
3.5A
L1
10
µH
SW1
BG1
LTC1439
SENSE+ 1
SENSE1
CSS1
0.1
µF
CC1
1000pF
COUT1
220
µF
10V
RSENSE1
0.03
RSENSE2
0.03
COUT
220
µF
10V
RC1
10k
ITH1
RUN/SS2
PGND
SGND
VPROG2
CDSC
INTVCC
DB2, CMDSH-3
DB1, CMDSH-3
VIN
VPROG1
RUN/SS1
D2
MBR140T3
CB1
0.1
µF
CB2, 0.1µF
4.7
µF
16V
M6*
1438 F01
M4
1000pF
1000pF
COSC
56pF
CSS2
0.1
µF
CC1A
220pF
M1, M2, M4, M5: Si4412DY
M3, M6: IRLML2803
*NOT REQUIRED FOR LTC1438
CC2A
470pF
CC2
1000pF
RC2
10k
+
L2
10
µH
VIN
5.2V TO 28V
+
+
CIN
22
µF
35V
× 4
+
BOLD LINES INDICATE HIGH CURRENT PATHS
M5
s
Notebook and Palmtop Computers, PDAs
s
Portable Instruments
s
Battery-Operated Devices
s
DC Power Distribution Systems
APPLICATIONS


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