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LTC3421EUF

Description
3A, 3MHz Micropower Synchronous Boost Converter with Output Disconnect
CategoryPower/power management    The power supply circuit   
File Size230KB,16 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet Parametric View All

LTC3421EUF Overview

3A, 3MHz Micropower Synchronous Boost Converter with Output Disconnect

LTC3421EUF Parametric

Parameter NameAttribute value
Brand NameLinear Technology
Is it Rohs certified?incompatible
MakerLinear ( ADI )
Parts packaging codeQFN
package instruction4 X 4 MM, PLASTIC, MO-220-WGGD, QFN-24
Contacts24
Manufacturer packaging codeUF
Reach Compliance Code_compli
ECCN codeEAR99
Analog Integrated Circuits - Other TypesSWITCHING REGULATOR
control modeCURRENT-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage4.5 V
Minimum input voltage0.5 V
Nominal input voltage1.2 V
JESD-30 codeS-PQCC-N24
JESD-609 codee0
length4 mm
Humidity sensitivity level1
Number of functions1
Number of terminals24
Maximum operating temperature70 °C
Minimum operating temperature
Maximum output current4.2 A
Package body materialPLASTIC/EPOXY
encapsulated codeHVQCCN
Encapsulate equivalent codeLCC24,.16SQ,20
Package shapeSQUARE
Package formCHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
Peak Reflow Temperature (Celsius)235
Certification statusNot Qualified
Maximum seat height0.8 mm
surface mountYES
Switch configurationBOOST
Maximum switching frequency3000 kHz
technologyCMOS
Temperature levelCOMMERCIAL
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formNO LEAD
Terminal pitch0.5 mm
Terminal locationQUAD
Maximum time at peak reflow temperature20
width4 mm
LTC3421
3A, 3MHz Micropower
Synchronous Boost Converter
with Output Disconnect
FEATURES
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
DESCRIPTIO
Synchronous Rectification: Up to 96% Efficiency
True Output Disconnect
Inrush Current Limiting
Very Low Quiescent Current: 12µA
Up to 1.5A Continuous Output Current
Fixed Frequency Operation Up to 3MHz
0.5V to 4.5V Input Range
2.4V to 5.25V Adjustable Output Voltage
Guaranteed 1V Start-Up
Programmable Current Limit
Programmable Soft-Start
Synchronizable Oscillator
Manual or Automatic Burst Mode
®
Operation
Low-Battery Comparator
< 1µA Shutdown Current
1.22V Reference Output Voltage
Small (4mm
×
4mm) Thermally Enhanced QFN
Package
The LTC
®
3421 is a high efficiency, current mode, fixed
frequency, step-up DC/DC converter with true output dis-
connect and inrush current limiting. The device includes a
0.10Ω N-channel MOSFET switch and a 0.14Ω P-channel
synchronous rectifier. This product has the ability to sim-
ply program the output voltage, switching frequency, cur-
rent limit, soft-start, Burst Mode threshold and loop
compensation with external passive components.
Quiescent current is only 12µA during Burst Mode opera-
tion, maximizing battery life in portable applications. The
oscillator frequency can be programmed up to 3MHz and
can be synchronized to an external clock applied to the
SYNC pin. An open-drain uncommitted low-battery com-
parator is included. The part maintains operation in
applications with a secondary cell powering the output
voltage during shutdown.
Other features include: 1µA shutdown, antiringing control,
thermal limit and reference output.
The LTC3421 is available in a small 4mm
×
4mm QFN
package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
APPLICATIO S
s
s
s
s
Handheld Computers
Cordless Phones
GPS Receivers
Battery Backup Supplies
TYPICAL APPLICATIO
V
IN
1.8V TO 3V
C1*
4.7µF
4
3
23
2
CELLS
22
7
8
45.3k
SS
6
0.1µF
R
T
5
28k
2
SHDN
ENB
V
REF
LBI
LBO
SYNC
I
LIM
21
V
IN
L1
4.7µH
14
15
16
V
OUT
3.3V
1.2A
340k
EFFICIENCY (%)
SW SW SW
18
V
OUTS
17
V
OUT
19
V
OUT
20
V
OUT
LTC3421
1
FB
24
V
C
9
BURST
10
11
12
13
0.1µF
C5*
22µF
470pF
20k
100k
200k
GND PGND PGND PGND
*LOCATE COMPONENTS CLOSE TO PINS
C1: TAIYO YUDEN JMK212BJ106MM
C5: TAIYO YUDEN JMK325BJ226MM
L1: TDK RLF7030T-4R7M3R4
3421 TA01
U
2-Cell to 3.3V Efficiency
100
90
80
70
60
50
40
30
20
10
V
OUT
= 3.3V
f
OSC
= 1MHz
10
100
1
OUTPUT CURRENT (mA)
1000
3421 G02
U
U
Burst Mode OPERATION
V
IN
= 3V
V
IN
= 2.4V
V
IN
= 2V
0
0.1
3421f
1
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