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| 型号： | LTC3838EUHF#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/54页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 38-QFN |
| 标准包装： | 2,500 |
| 系列： | PolyPhase® |
| PWM 型： | 电流模式 |
| 输出数： | 2 |
| 频率 - 最大： | 2MHz |
| 电源电压： | 4.5 V ~ 38 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： | -40°C ~ 125°C |
| 封装/外壳： | 38-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
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LTC3838
Dual, Fast, Accurate Step-
Down DC/DC Controller with
Differential Output Sensing
FEATURES
DESCRIPTION
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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 on Channel 1
±1% Output on the Independent 2nd Channel
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
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 38-Pin (5mm × 7mm) QFN and
The LTC ? 3838 is a dual, PolyPhase ? synchronous step-down
DC/DC switching regulator controller. Two independent
channels drive 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 on Channel 1, even if the remote output ground
deviates from local ground by ±500mV. The second channel
can either provide an independent ±1% output, or together
with the first channel of this controller, serve as one of the
PolyPhase channels for a single-output voltage.
Distributed Power Systems
Point-of-Load Converters
Computing Systems
TSSOP packages
APPLICATIONS
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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. Voltage track-
ing soft start-up and multiple safety features are provided.
L , LT, LTC, LTM, PolyPhase, OPTI-LOOP, Linear Technology and the Linear logo are registered
trademarks and Hot Swap, No R SENSE and UltraFast are trademarks of Linear Technology
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Data Communication Systems
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
1.2V/1.5V, 15A, 350kHz, DCR Sense, Step-Down Converter (Refer to Figure 16 for Full Design)
SENSE1
SENSE2
V IN
4.5V TO 38V
SENSE1 –
+
V IN
SENSE2 –
+
INTV CC
100
90
Efficiency/Power Loss
FORCED CONTINUOUS MODE
DISCONTINUOUS MODE
2.5
2.0
V OUT1
1.2V
15A
330μF
+
0.56μH
10k
0.1μF
TG1 TG2
LTC3838
SW1 SW2
BOOST1 BOOST2
DRV CC1 DRV CC2
0.1μF
0.56μH
15k
+
V OUT2
1.5V
15A
330μF
80
70
60
EFFICIENCY
POWER
LOSS
1.5
1.0
2
10k
4.7μF
BG1
PGND
BG2
10k
2
50
V IN = 12V
0.5
V OUTSENSE1+
V OUTSENSE1–
V FB2
40
0.1
V OUT = 1.2V
1 10
LOAD CURRENT (A)
0
TRACK/SS1 TRACK/SS2
3838 F16b
115k
ITH1
RT
ITH2
3838 TA01a
SGND
3838fa
1
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相关代理商/技术参数 |
参数描述 |
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| LTC3838IFE#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 38TSSOP 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:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 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:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LTC3838IFE#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 38TSSOP 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:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 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:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LTC3838IUHF#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 38-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) |
| LTC3838IUHF#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 38-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) |
| LTC3838IUHF-1#PBF | 制造商:Linear Technology 功能描述:IC REG CTRLR BUCK PWM CM 38QFN 制造商:Linear Technology 功能描述:BUCK DUAL CNTRL 4.5-38V 2MHZ 38QFN 制造商:Linear Technology 功能描述:BUCK, DUAL, CNTRL, 4.5-38V, 2MHZ, 38QFN 制造商:Linear Technology 功能描述:DP-SWREG/Controller, Dual, Fast, Accurate Step-Down Controller with Differential 制造商:Linear Technology 功能描述:DC-DC CONTROLLER, DUAL, BUCK, ADJ, QFN-38, Primary Input Voltage:38V, No. of Outputs:2, Output Current:25A, No. of Pins:38, Operating Temperature Min:-40C, Operating Temperature Max:125C, MSL:MSL 1 - Unlimited , RoHS Compliant: Yes |
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