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参数资料
| 型号： | LTC3736-2EUF#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, PQCC24 |
| 封装： | 4 X 4 MM, LEAD FREE, PLASTIC, QFN-24 |
| 文件页数： | 1/28页 |
| 文件大小： | 344K |
| 代理商： | LTC3736-2EUF#TRPBF |
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LTC3736-2
1
37362fb
TYPICAL APPLICATION
DESCRIPTION
Dual 2-Phase, No RSENSETM,
Synchronous Controller
with Output Tracking
The LTC3736-2 is a 2-phase dual synchronous step-down
switching regulator controller with tracking that drives
external complementary power MOSFETs using few ex-
ternal components. The constant-frequency current mode
architecture with MOSFET VDS sensing eliminates the need
for sense resistors and improves efciency. Power loss and
noise due to the ESR of the input capacitance are minimized
by operating the two controllers out-of-phase.
Pulse-skipping operation provides high efciency at light
loads. 100% duty cycle capability provides low dropout
operation, extending operating time in battery-powered
systems.
The switching frequency can be programmed up to 750kHz,
allowing the use of small surface mount inductors and
capacitors. For noise sensitive applications, the LTC3736-2
switching frequency can be externally synchronized from
250kHz to 850kHz. An internal soft-start, which can be
lengthened externally, smoothly ramps the output voltage
during start-up.
The LTC3736-2 is available in the tiny thermally enhanced
(4mm
× 4mm) QFN and 24-lead narrow SSOP packages.
High Efciency, 2-Phase, Dual Synchronous DC/DC Step-Down Converter
FEATURES
APPLICATIONS
n No Current Sense Resistors Required
n Out-of-Phase Controllers Reduce Required
Input Capacitance
n Tracking Function
n Wide VIN Range: 2.75V to 9.8V
n 0.6V ±1% Voltage Reference
n High Current Limit
n Constant-Frequency Current Mode Operation
n Low Dropout Operation: 100% Duty Cycle
n True PLL for Frequency Locking or Adjustment
n Selectable Pulse-Skipping/Forced Continuous
Operation
n Auxiliary Winding Regulation
n Internal Soft-Start Circuitry
n Power Good Output Voltage Monitor
n Output Overvoltage Protection
n Micropower Shutdown: IQ = 9μA
n Tiny Low Prole (4mm
× 4mm) QFN and Narrow
SSOP Packages
n One or Two Lithium-Ion Powered Devices
n Notebook and Palmtop Computers, PDAs
n Portable Instruments
n Distributed DC Power Systems
Efciency and Power Loss
vs Load Current (Figure 15 Circuit)
SENSE1+
VIN
LTC3736-2
SGND
SENSE2+
TG1
TG2
SW1
SW2
BG1
BG2
PGND
VFB1
VFB2
220pF
VOUT1
2.5V
VOUT2
1.8V
47μF
15k
220pF
15k
59k
187k
118k
2.2μH
ITH1
37362 TA01a
ITH2
10μF
2
VIN
2.75V TO 9.8V
LOAD CURRENT (mA)
65
EFFICIENCY
(%)
POWER
LOSS
(W)
95
100
60
55
90
75
85
80
70
1
100
1000
10000
37362 TA01b
50
10
0.01
0.1
1
0.001
10
VOUT = 2.5V
EFFICIENCY
POWER LOSS
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
No RSENSE 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, 6580258, 6304066, 6611131, 6498466.
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PDF描述 |
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| LTC3823EUH | 4 A SWITCHING CONTROLLER, 200 kHz SWITCHING FREQ-MAX, PQCC32 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3736EGN | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:否 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) |
| LTC3736EGN#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 24-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 |
| LTC3736EGN#TR | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:否 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) |
| LTC3736EGN#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 24-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) |
| LTC3736EGN-1 | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:否 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 |
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