參數(shù)資料
型號(hào)： LTC3421EUF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 3A, 3MHz Micropower Synchronous Boost Converter with Output Disconnect
中文描述： 4.2 A SWITCHING REGULATOR, 3000 kHz SWITCHING FREQ-MAX, PQCC24
封裝： 4 X 4 MM, PLASTIC, MO-220-WGGD, QFN-24
文件頁(yè)數(shù)： 1/16頁(yè)
文件大?。?/td> 234K
代理商： LTC3421EUF
LTC3421
1
3421f
I
Handheld Computers
I
Cordless Phones
I
GPS Receivers
I
Battery Backup Supplies
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
I
Synchronous Rectification: Up to 96% Efficiency
I
True Output Disconnect
I
Inrush Current Limiting
I
Very Low Quiescent Current: 12
μ
A
I
Up to 1.5A Continuous Output Current
I
Fixed Frequency Operation Up to 3MHz
I
0.5V to 4.5V Input Range
I
2.4V to 5.25V Adjustable Output Voltage
I
Guaranteed 1V Start-Up
I
Programmable Current Limit
I
Programmable Soft-Start
I
Synchronizable Oscillator
I
Manual or Automatic Burst Mode
Operation
I
Low-Battery Comparator
I
<1
μ
A Shutdown Current
I
1.22V Reference Output Voltage
I
Small (4mm
×
4mm) Thermally Enhanced QFN
Package
APPLICATIU
3A, 3MHz Micropower
Synchronous Boost Converter
with Output Disconnect
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
0.10
N-channel MOSFET switch and a 0.14
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
μ
A 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
μ
A shutdown, antiringing control,
thermal limit and reference output.
The LTC3421 is available in a small 4mm
×
4mm QFN
package.
SHDN
ENB
V
REF
LBI
LBO
SYNC
I
LIM
V
OUTS
V
OUT
V
OUT
V
OUT
FB
V
C
BURST
V
IN
2
21
14
15
16
18
17
19
20
1
24
9
13
0.1
μ
F
12
11
10
5
28k
6
8
7
22
23
3
4
SW SW
L1
4.7
μ
H
SW
SS
R
T
GND
LTC3421
0.1
μ
F
470pF
C5*
22
μ
F
C1*
4.7
μ
F
V
IN
1.8V TO 3V
2
CELLS
20k
100k
340k
V
3.3V
1.2A
200k
3421 TA01
45.3k
*LOCATE COMPONENTS CLOSE TO PINS
C1: TAIYO YUDEN JMK212BJ106MM
PGND PGNDPGND
C5: TAIYO YUDEN JMK325BJ226MM
L1: TDK RLF7030T-4R7M3R4
2-Cell to 3.3V Efficiency
OUTPUT CURRENT (mA)
30
E
90
100
20
10
80
50
70
60
40
0.1
10
100
1000
3421 G02
0
1
Burst Mode OPERATION
V
IN
= 3V
V
OUT
= 3.3V
f
OSC
= 1MHz
V
IN
= 2.4V
V
IN
= 2V
DESCRIPTIOU
FEATURES
TYPICAL APPLICATIO
U
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC3421EUF#PBF 功能描述:IC REG BOOST SYNC ADJ 1.5A 24QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:250 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開(kāi)關(guān):2MHz 電流 - 輸出:500mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:6-UFDFN 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:6-SON（1.45x1） 產(chǎn)品目錄頁(yè)面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2
LTC3421EUF#TR 功能描述:IC REG BOOST SYNC ADJ 1.5A 24QFN RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開(kāi)關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤(pán) 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤(pán)
LTC3421EUF#TRPBF 功能描述:IC REG BOOST SYNC ADJ 1.5A 24QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開(kāi)關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤(pán) 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤(pán)
LTC3421EUFPBF 制造商:Linear Technology 功能描述:LTC3421 adj 3A sync SU dc-dc converter
LTC3422 制造商:LINER 制造商全稱:Linear Technology 功能描述:1.5A, 3MHz Synchronous Step-Up DC/DC Converter with Output Disconnect
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