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参数资料
| 型号： | LTC3737EUF |
| 厂商： | Linear Technology |
| 文件页数： | 1/24页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 24-QFN |
| 标准包装： | 91 |
| 系列： | PolyPhase® |
| PWM 型： | 电流模式 |
| 输出数： | 2 |
| 频率 - 最大： | 825kHz |
| 占空比： | 100% |
| 电源电压： | 2.75 V ~ 9.8 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： | 24-WFQFN 裸露焊盘 |
| 包装： | 管件 |
LTC3737
Dual 2-Phase, No R SENSE TM ,
DC/DC Controller with
Output Tracking
FEATURES
DESCRIPTIO
■
■
■
■
■
■
■
■
■
■
■
■
■
■
■
■
Sense Resistor Optional
Out-of-Phase Controllers Reduce Required
Input Capacitance
Programmable Output Voltage Tracking
Constant Frequency Current Mode Architecture
Wide V IN Range: 2.75V to 9.8V
Wide V OUT Range: 0.6V to V IN
0.6V ± 1.5% Reference
Low Dropout Operation: 100% Duty Cycle
True PLL for Frequency Locking or Adjustment
(Frequency Range 250kHz to 850kHz)
Selectable Burst Mode ? or Pulse Skipping Operation
at Light Loads
Internal Soft-Start Circuitry
Selectable Maximum Peak Current Sense Threshold
Power Good Output Voltage Monitor
Output Overvoltage Protection
Micropower Shutdown: I Q = 9 μ A
Tiny 4mm × 4mm QFN and 24-Lead SSOP Packages
The LTC ? 3737 is a 2-phase dual step-down switching
regulator controller that requires few external compo-
nents. The constant frequency current mode architecture
provides excellent AC and DC load and line regulation.
MOSFET V DS sensing eliminates the need for current
sense resistors and improves efficiency. Power loss and
noise due to the ESR of the input capacitance are mini-
mized by operating the two controllers out of phase.
Burst Mode operation provides high efficiency operation
at light loads. 100% duty cycle provides low dropout
operation and extends battery operating time.
Switching frequency can be programmed up to 750kHz,
allowing the use of small surface mount inductors and
capacitors. For noise sensitive applications, the LTC3737
can be externally synchronized from 250kHz to 850kHz.
Other features include a power good output voltage moni-
tor, a tracking input and internal soft-start.
The LTC3737 is available in the low profile thermally
APPLICATIO S
■ One or Two Lithium-Ion Powered Devices
■ Notebook and Palmtop Computers, PDAs
■ Portable Instruments
enhanced (4mm × 4mm) QFN package or a 24-lead SSOP
narrow package.
, LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode
is a registered trademark of Linear Technology Corporation. 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, 5731694, 5929620, 6144194,
■
Distributed DC Power Systems
6580258, 5994885
TYPICAL APPLICATIO
V IN
2.75V TO
Efficiency and Power Loss vs Load Current
100 10000
187k
59k
SW1
V FB1
SENSE1 +
PV IN1
M1
2.2 μ H
+
9.8V
V OUT1
2.5V
95
90
V OUT = 2.5V
EFFICIENCY
1000
220pF
15k
I TH1 PGATE1
PGOOD V IN
LTC3737
SGND PGND
D1
47 μ F
10 μ F
× 2
85
80
V OUT = 1.8V
100
59k
220pF
15k
TRACK
I TH2
V FB2
SW2
RUN/SS
PGATE2
PV IN2
SENSE2 +
D2
2.2 μ H
47 μ F
V OUT2
1.8V
75
70
65
TYPICAL POWER LOSS
(V OUT = 2.5V)
10
118k
M2
60
V IN = 3.3V
1
3737 F01
1
10
100 1000
10000
LOAD CURRENT (mA)
Figure 1. High Efficiency, 2-Phase, 550kHz Dual Step-Down Converter
3737 F01b
3737fa
1
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| LTC3737EUF#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 24-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) |
| LTC3737EUF#TR | 功能描述:IC REG CTRLR BUCK PWM CM 24-QFN 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) |
| LTC3737EUF#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 24-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) |
| LTC3738CUHF | 功能描述:IC CTRLR SW REG 3PH STPDWN 38QFN RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LTC3738CUHF#PBF | 功能描述:IC CTRLR SW REG 3PH STPDWN 38QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
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