参数资料
型号: LTC3839EUH#TRPBF
厂商: Linear Technology
文件页数: 1/50页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 32-QFN
标准包装: 2,500
系列: PolyPhase®
PWM 型: 电流模式
输出数: 1
频率 - 最大: 2MHz
电源电压: 4.5 V ~ 38 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 125°C
封装/外壳: 32-WFQFN 裸露焊盘
包装: 带卷 (TR)

LTC3839
Fast, Accurate, 2-Phase,
Single-Output Step-Down DC/DC
Controller with Differential Output Sensing
FEATURES
DESCRIPTION
n
n
n
n
n
n
n
n
n
n
n
n
n
Wide V IN Range: 4.5V to 38V, V OUT : 0.6V to 5.5V
±0.67% Output Voltage Accuracy Over Temperature,
Differential Output Voltage Sensing, Allowing Up to
±500mV Line Loss at Remote Ground
Controlled On-Time, Valley Current Mode Control
Fast Load Transient Response
Detect Transient (DTR) Reduces V OUT Overshoot
Frequency Programmable from 200kHz to 2MHz,
Synchronizable to External Clock
t ON(MIN) = 30ns, t OFF(MIN) = 90ns
Up to 12-Phase Operation
R SENSE or Inductor DCR Current Sensing
Overvoltage Protection and Current Limit Foldback
Power Good Output Voltage Monitor
Output Voltage Tracking and Adjustable Soft Start-Up
Thermally Enhanced 32-Pin (5mm × 5mm) QFN
Package
The LTC ? 3839 is a 2-phase, single-output PolyPhase ?
synchronous step-down switching regulator controller
that drives all N-channel power MOSFETs. The controlled
on-time, valley current mode control architecture allows for
fast transient response and constant frequency switching
in steady-state operation, independent of V IN , V OUT and
load current. Its load-release transient detection feature
significantly reduces overshoot at low output voltages.
Differential output voltage sensing, along with a preci-
sion internal reference, offers an accurate ±0.67% output
regulation, even if the remote output ground deviates from
local ground by ±500mV.
The switching frequency can be programmed from 200kHz
to 2MHz with an external resistor and can be synchronized
to an external clock. Very low t ON and t OFF times allow for
near 0% and near 100% duty cycles, respectively. Volt-
age tracking soft start-up and multiple safety features are
APPLICATIONS
provided.
L , LT, LTC, LTM, PolyPhase, OPTI-LOOP, Linear Technology and the Linear logo are
n
n
n
n
Distributed Power Systems
Point-of-Load Converters
Computing Systems
Data Communication Systems
registered trademarks and Hot Swap and Stage Shedding are trademarks of Linear Technology
Corporation. All other trademarks are the property of their respective owners. Protected by U.S.
Patents, including 5481178, 5847554, 6580258, 6304066, 6476589, 6774611.
TYPICAL APPLICATION
3.3V/25A Output, 2MHz Step-Down Converter (Refer to Figure 20 for Full Design)
V IN
4.5V TO 14V
Efficiency/Power Loss
SENSE1 –
SENSE1 +
V IN
SENSE2 –
SENSE2 +
INTV CC
100
90
DISCONTINUOUS
MODE
V IN = 5V
10
8
TG1
LTC3839
TG2
V OUT
3.3V
25A
100μF
+
45.3k
0.3μH
0.1μF
SW1
BOOST1
DRV CC1
SW2
BOOST2
DRV CC2
0.1μF
0.3μH
80
70
FORCED
CONTINUOUS
MODE
6
4
6
BG1
BG2
V OUTSENSE
10k
4.7μF
PGND
+
V OUTSENSE–
TRACK/SS
MODE/PLLIN
CLKOUT
PHASMD
60
50
0.1
LOSS
FORCED CM
1 10
LOAD CURRENT (A)
LOSS
DCM
2
0
100
18.7k
ITH
RT
RUN
DTR
3839 TA01b
SGND
3839 TA01a
3839fa
1
相关PDF资料
PDF描述
LTC3838EUHF#TRPBF IC REG CTRLR BUCK PWM CM 38-QFN
LTC3856EUH#TRPBF IC REG CTRLR BUCK PWM CM 38-QFN
SXR222M010ST CAP ALUM 2200UF 10V 20% RADIAL
LTC3855EUJ#TRPBF IC REG CTRLR BUCK PWM CM 40-QFN
UCY2C121MHD CAP ALUM 120UF 160V 20% RADIAL
相关代理商/技术参数
参数描述
LTC3839IUH#PBF 功能描述:IC REG CTRLR BUCK PWM CM 32-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR)
LTC3839IUH#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 32-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR)
LTC3850EGN#PBF 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR
LTC3850EGN#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR)
LTC3850EGN-1#PBF 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR)