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| 型号： | LTC3836EUFD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/30页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 28-QFN |
| 标准包装： | 2,500 |
| 系列： | PolyPhase® |
| PWM 型： | 电流模式 |
| 输出数： | 2 |
| 频率 - 最大： | 825kHz |
| 占空比： | 97% |
| 电源电压： | 2.75 V ~ 4.5 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 ~ 85°C |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
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LTC3836
Dual 2-Phase,
No R SENSE TM Low V IN
Synchronous Controller
FEATURES
DESCRIPTION
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No Current Sense Resistors Required
Out-of-Phase Controllers Reduce Required Input
Capacitance
All N-Channel Synchronous Drive
V IN Range: 2.75V to 4.5V
Constant-Frequency Current Mode Operation
0.6V ± 1.5% Voltage Reference
Low Dropout Operation: 97% Duty Cycle
True PLL for Frequency Locking or Adjustment
Selectable Pulse-Skipping/Continuous Operation
Tracking Function
Internal Soft-Start Circuitry
Power Good Output Voltage Monitor
Output Overvoltage Protection
Micropower Shutdown: I Q = 6.5μA
Tiny Low Pro?le (4mm × 5mm) QFN and Narrow
SSOP Packages
The LTC ? 3836 is a 2-phase dual output synchronous
step-down switching regulator controller with tracking
that drives external N-channel power MOSFETs using few
external components. The constant-frequency current
mode architecture with MOSFET V DS sensing eliminates
the need for sense resistors and improves ef?ciency.
The power loss and noise due to the ESR of the input
capacitance are minimized by operating the two control-
lers out-of-phase. Pulse-skipping operation provides high
ef?ciency at light loads. The 97% duty cycle capability
provides low dropout operation, extending operating time
in battery-powered systems.
The operating frequency is selectable from 300kHz to
750kHz, allowing the use of small surface mount induc-
tors and capacitors. For noise sensitive applications, the
LTC3836 operating frequency can be externally synchro-
nized from 250kHz to 850kHz.
General Purpose 3.3V to 1.X Supplies
Single Lithium-Ion Powered Devices
Distributed DC Power Systems
APPLICATIONS
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L , LT, LTC, LTM, Linear Technology, Burst Mode, OPTI-LOOP and the Linear logo are
registered trademarks and No R SENSE is a trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Protected by U.S. Patents including
5481178, 5929620, 6144194, 6304066, 6498466, 6580258, 6611131.
TYPICAL APPLICATION
The LTC3836 features an internal 1ms soft-start that can
be extended with an external capacitor. A tracking input al-
lows the second output to track the ?rst during start-up.
The LTC3836 is available in the tiny thermally enhanced
(4mm × 5mm) QFN and 28-lead narrow SSOP packages.
High Ef?ciency, 2-Phase, Dual Synchronous DC/DC Step-Down Converter
Ef?ciency/Power Loss vs Load Current
0.47 μ H
V IN
BOOST1 BOOST2
SENSE1 + SENSE2 +
TG1 TG2
SW1
SW2
22 μ F
× 3
0.47 μ H
V IN
3.3V
100
90
80
70
60
3.3V-1.8V
EFFICIENCY
3.3V-1.2V
EFFICIENCY
10000
1000
BG1
LTC3836
BG2
50
40
3.3V-1.2V
POWER LOSS
100
POWER LOSS
V OUT1
1.8V AT
15A
118k
100 μ F
× 2
59k
820pF
15k
V FB1
I TH1
SGND
PGND
V FB2
I TH2
820pF
15k
59k
59k
V OUT2
1.2V AT
15A
100 μ F
× 2
30
20
10
0
10
3.3V-1.8V
CIRCUIT OF FIGURE 15
100 1000 10000 100000
10
1
3836 TA01
LOAD CURRENT (mA)
3836 TA01b
3836fb
1
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相关代理商/技术参数 |
参数描述 |
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| LTC3838EFE#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:2,000 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:1MHz 占空比:50% 电源电压:9 V ~ 10 V 降压:无 升压:是 回扫:是 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:8-TSSOP（0.173"，4.40mm 宽） 包装:带卷 (TR) |
| LTC3838EFE#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: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) |
| LTC3838EUHF#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) |
| LTC3838EUHF#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) |
| LTC3838EUHF-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: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 制造商:Linear Technology 功能描述:DP-SWREG/Controller, Dual, Fast, Accurate Step-Down Controller with Differential |
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