參數(shù)資料
型號(hào)： LTC1622
廠商： Linear Technology Corporation
英文描述： Low Input Voltage Current Mode Step-Down DC/DC Controller
中文描述： 低輸入電壓電流模式降壓DC / DC控制器
文件頁數(shù)： 1/16頁
文件大?。?/td> 219K
代理商： LTC1622
1
LTC1622
Low Input Voltage
Current Mode Step-Down
DC/DC Controller
The LTC
1622 is a constant frequency current mode step-
down DC/DC controller providing excellent AC and DC load
and line regulation. The device incorporates an accurate
undervoltage feature that shuts the LTC1622 down when
the input voltage falls below 2V.
The LTC1622 boasts a
±
1.9% output voltage accuracy and
consumes only 350
μ
A of quiescent current. For applica-
tions where efficiency is a prime consideration and the
load current varies from light to heavy, the LTC1622 can
be configured for Burst Mode
TM
operation. Burst Mode
operation enhances low current efficiency and extends
battery run time. Burst Mode operation is inhibited during
synchronization or when the SYNC/MODE pin is pulled low
to reduce noise and possible RF interference.
High constant operating frequency of 550kHz allows the
use of a small inductor. The device can also be synchro-
nized up to 750kHz for special applications. The high
frequency operation and the available 8-lead MSOP pack-
age create a high performance solution in an extremely
small amount of PCB area.
To further maximize the life of the battery source, the
P-channel MOSFET is turned on continuously in dropout
(100% duty cycle). In shutdown, the device draws a mere
15
μ
A.
I
1- or 2-Cell Li-Ion Powered Applications
I
Cellular Telephones
I
Wireless Modems
I
Portable Computers
I
Distributed 3.3V, 2.5V or 1.8V Power Systems
I
Scanners
I
Battery-Powered Equipment
, LTC and LT are registered trademarks of Linear Technology Corporation.
I
High Efficiency
I
Constant Frequency 550kHz Operation
I
V
IN
Range: 2V to 10V
I
Multiampere Output Currents
I
OPTI-LOOP
TM
Compensation Minimizes C
OUT
I
Selectable, Burst Mode
Operation
I
Low Dropout Operation: 100% Duty Cycle
I
Synchronizable up to 750kHz
I
Current Mode Operation for Excellent Line and Load
Transient Response
I
Low Quiescent Current: 350
μ
A
I
Shutdown Mode Draws Only 15
μ
A Supply Current
I
±
1.9% Reference Accuracy
I
Available in 8-Lead MSOP
APPLICATIU
Burst Mode and OPTI-LOOP are a trademarks of Linear Technology Corporation.
FEATURES
DESCRIPTIOU
TYPICAL APPLICATIO
U
Figure 1. High Efficiency Step-Down Converter
2
4
1
8
V
IN
7
5
6
3
SYNC/MODE
RUN/SS
L1
4.7
μ
H
R2
0.03
D1
IR10BQ015
Si3443DV
R3
159k
V
2.5V
1.5A
C2
47
μ
F
6V
R1
10k
C3
220pF
C1: TAIYO YUDEN CERAMIC EMK325BJ106MNT
C2: SANYO POSCAP 6TPA47M
D1: INTERNATIONAL RECTIFIER IR10BQ015
V
2.5V TO 8.5V
R4
75k
1622 F01a
470pF
C1
10
μ
F
10V
LTC1622
V
FB
+
SENSE
–
PDRV
I
TH
GND
L1: MURATA LQN6C-4R7
R2: DALE WSL-1206 0-03
LOAD CURRENT (mA)
E
100
90
80
70
60
50
40
1
100
1000
5000
1622 F01b
10
V
OUT
= 2.5V
R
SENSE
= 0.03
V
IN
= 3.3V
V
IN
= 6V
V
IN
= 8.4V
V
IN
= 4.2V
Efficiency vs Load Current with
Burst Mode Operation Enabled
相關(guān)PDF資料
PDF描述
LTC1622CS8 Low Input Voltage Current Mode Step-Down DC/DC Controller
LTC1622IS8 8-Bit, 40 kSPS ADC Serial Out, Low Power, Compatible to TLC540/545/1540, Single Ch. 8-SOIC
LTC1623C 8-Bit, 40 kSPS ADC Serial Out, Low Power, Compatible to TLC540/545/1540, Single Ch. 8-PDIP
LTC1623CMS8 SMBus Dual High Side Switch Controller
LTC1623CS8 8-Bit, 40 kSPS ADC Serial Out, Low Power, Compatible to TLC540/545/1540, Single Ch. 8-SOIC
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC1622CMS8 功能描述:IC REG CTRLR BUCK PWM CM 8-MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR)
LTC1622CMS8#PBF 功能描述:IC REG CTRLR BUCK PWM CM 8-MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 特色產(chǎn)品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 標(biāo)準(zhǔn)包裝:1 系列:PowerWise® PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:81% 電源電壓:4.5 V ~ 18 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-5°C ~ 125°C 封裝/外殼:32-WFQFN 裸露焊盤 包裝:Digi-Reel® 產(chǎn)品目錄頁面:1303 (CN2011-ZH PDF) 其它名稱:LM3754SQDKR
LTC1622CMS8#TR 功能描述:IC REG CTRLR BUCK PWM CM 8-MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR)
LTC1622CMS8#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 8-MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR)
LTC1622CS8 功能描述:IC REG CTRLR BUCK PWM CM 8-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR)
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