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LT3494AEDDB#PBF

Description
Conv DC-DC 2.3V to 16V Step Up Single-Out 40V 8-Pin DFN EP T/R
File Size206KB,12 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Parametric View All

LT3494AEDDB#PBF Overview

Conv DC-DC 2.3V to 16V Step Up Single-Out 40V 8-Pin DFN EP T/R

LT3494AEDDB#PBF Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesCompliant
ECCN (US)0
Part StatusUnconfirmed
HTS8542.39.00.01
TypeStep Up
IsolationIsolated
Output TypeAdjustable
Switching Frequency (kHz)50(Min)
Switching RegulatorYes
Number of Outputs1
Output Voltage (V)40(Max)
Minimum Input Voltage (V)2.3
Maximum Input Voltage (V)16
Operating Supply Voltage (V)2.3 to 16
Typical Switch Current (A)0.35
Typical Quiescent Current (uA)65
Minimum Operating Temperature (°C)-40
Maximum Operating Temperature (°C)85
Supplier Temperature GradeExtended
PackagingTape and Reel
Pin Count8
Standard Package NameDFN
Supplier PackageDFN EP
MountingSurface Mount
Package Height0.75(Max)
Package Length3
Package Width2
PCB changed8
Lead ShapeNo Lead
LT3494/LT3494A
Micropower Low Noise
Boost Converters with
Output Disconnect
FEATURES
DESCRIPTION
The LT
®
3494/LT3494A are low noise boost converters
with integrated power switch, Schottky diode and output
disconnect circuitry. The parts use a novel* control tech-
nique resulting in low output voltage ripple as well as high
efficiency over a wide load current range. This technique
guarantees that the switching frequency stays above the
audio band for the entire load range. The parts feature a high
performance NPN power switch with a 350mA and 180mA
current limit for the LT3494A and LT3494 respectively. The
quiescent current is a low 65μA, which is further reduced
to less than 1μA in shutdown. The internal disconnect
circuitry allows the output voltage to be isolated from the
input during shutdown. An auxiliary reference input (CTRL
pin) overrides the internal 1.225V feedback reference with
any lower value allowing full control of the output voltage
during operation. The LT3494/LT3494A are available in a
tiny 8-lead 3mm
×
2mm DFN package.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
*Patent pending.
Low Quiescent Current
65μA in Active Mode
1μA in Shutdown Mode
Switching Frequency is Non-Audible Over Entire
Load Range
Integrated Power NPN:
350mA Current Limit (LT3494A)
180mA Current Limit (LT3494)
Integrated Schottky Diode
Integrated Output Disconnect
Integrated Output Dimming
Wide Input Range: 2.3V to 16V
Wide Output Range: Up to 40V
Tiny 8-Lead 3mm
×
2mm DFN Package
APPLICATIONS
OLED Power
Low Noise Power
MP3 Players
TYPICAL APPLICATION
OLED Power Supply from One Li-Ion Cell
V
IN
3V
TO 4.2V
15μH
4.7μF
SW
V
CC
SHDN
CTRL
CAP
V
OUT
2.21M
FB
GND
3494 TA01a
Output Voltage Ripple
vs Load Current
15
V
OUT
PEAK-TO-PEAK RIPPLE (mV)
LT3494
FIGURE 5 CIRCUIT
100MHz MEASUREMENT BW
EFFICIENCY (%)
90
80
70
60
50
40
30
0
0.1
1
10
LOAD CURRENT (mA)
100
3494 TA01b
Efficiency and Power Loss
vs Load Current
V
IN
= 3.6V
280
LOAD FROM
CAPACITOR
LOAD FROM
V
OUT
240
200
160
120
80
40
0
100
3494 TA01c
POWER LOSS (mW)
0.22μF
V
OUT
16V
16mA
2.2μF
10
LT3494
5
20
0.1
1
10
LOAD CURRENT (mA)
3494fb
1
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