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LTC3421EUF Datasheet

  • LTC3421EUF

  • 3A, 3MHz Micropower Synchronous Boost Converter with Output ...

  • 16頁

  • LINER

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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: 12碌A(chǔ)
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
廬
Operation
Low-Battery Comparator
< 1碌A(chǔ) Shutdown Current
1.22V Reference Output Voltage
Small (4mm
脳
4mm) Thermally Enhanced QFN
Package
The LTC
廬
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
0.10鈩?N-channel MOSFET switch and a 0.14鈩?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 12碌A(chǔ) 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: 1碌A(chǔ) shutdown, antiringing control,
thermal limit and reference output.
The LTC3421 is available in a small 4mm
脳
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
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Handheld Computers
Cordless Phones
GPS Receivers
Battery Backup Supplies
TYPICAL APPLICATIO
V
IN
1.8V TO 3V
C1*
4.7碌F
4
3
23
2
CELLS
22
7
8
45.3k
SS
6
0.1碌F
R
T
5
28k
2
SHDN
ENB
V
REF
LBI
LBO
SYNC
I
LIM
21
V
IN
L1
4.7碌H
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
0.1碌F
C5*
22碌F
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

LTC3421EUF 產(chǎn)品屬性

  • LTC3421

  • 91

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器

  • -

  • 升壓（升壓）

  • 可調(diào)式

  • 1

  • 2.4 V ~ 5.25 V

  • 0.5 V ~ 4.5 V

  • 電流模式，混合

  • 100kHz ~ 3MHz

  • 1.5A

  • 是

  • -40°C ~ 85°C

  • 表面貼裝

  • 24-WFQFN 裸露焊盤

  • 管件

  • 24-QFN 裸露焊盤（4x4）

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