參數(shù)資料
型號: 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): 4/16頁
文件大?。?/td> 219K
代理商: LTC1622
4
LTC1622
TYPICAL PERFOR
M
A
CE CHARACTERISTICS
U
PI
FU
CTIO
N
S
U
U
SENSE
(Pin 1):
The Negative Input to the Current Com-
parator.
I
TH
(Pin 2):
Error Amplifier Compensation Point. The
current comparator threshold increases with this control
voltage. Nominal voltage range for this pin is 0V to 1.2V.
V
FB
(Pin 3):
Receives the feedback voltage from an exter-
nal resistive divider across the output capacitor.
RUN/SS (Pin 4):
Combination of Soft-Start and Run
Control Inputs. A capacitor to ground at this pin sets the
ramp time to full output current. The time is approximately
0.45s/
μ
F. Forcing this pin below 0.4V causes all circuitry
to be shut down.
SYNC/MODE (Pin 5):
This pin performs three functions.
Greater than 2V on this pin allows Burst Mode operation
at low load currents, while grounding or applying a clock
signal on this pin defeats Burst Mode operation. An
external clock between 625kHz and 750kHz applied to this
pin forces the LTC1622 to operate at the external clock
frequency. Do not attempt to synchronize below 625kHz
Pin 5 has an internal 1
μ
A pull-up current source.
GND (Pin 6):
Ground Pin.
PDRV (PIN 7):
Gate Drive for the External P-Channel
MOSFET. This pin swings from 0V to V
IN
.
V
IN
(Pin 8):
Main Supply Pin. Must be closely decoupled
to ground Pin 6.
LOAD CURRENT (mA)
1
E
100
90
80
70
60
50
40
10
100
1622 G07
1000
V
OUT
= 2.5V
R
SENSE
= 0.03
V
IN
= 3.3V
V
IN
= 4.2V
V
IN
= 8.4V
V
IN
= 6V
Efficiency vs Load Current for
Figure 1 with Burst Mode
Operation Defeated
Load Step Transient Response
Burst Enabled
I
LOAD
= 50mA TO 1.2A
V
IN
= 4.2V
1622 G08
I
LOAD
= 50mA TO 1.2A
V
IN
= 4.2V
1622 G09
Load Step Transient Response
Burst Inhibited
1
1
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:- 標準包裝: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 標準包裝: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:- 標準包裝: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:- 標準包裝: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:- 標準包裝: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)