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UC3750_11 PDF预览

UC3750_11

更新时间: 2024-11-05 07:09:15
品牌 Logo 应用领域
友顺 - UTC 控制器
页数 文件大小 规格书
8页 193K
描述
600kHZ PWM/PFM STEP-DOWN DC-DC CONTROLLER

UC3750_11 数据手册

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UNISONIC TECHNOLOGIES CO., LTD  
UC3750  
Preliminary  
CMOS IC  
600kHZ PWM/PFM STEP-DOWN  
DC-DC CONTROLLER  
„
DESCRIPTION  
The UTC UC3750 is a high frequency, micropower, voltage  
mode step-down DC-DC controller IC and is designed for battery  
operated hand-held electronic products. It can provide up to 2.0A  
loading current with conversion efficiency by connection of  
appropriate external P-type MOSFET. It also can be applied to  
operate for voltage regulation with minimum external components  
and board space.  
The UTC UC3750 can operate in the constant -frequency PWM  
(Pulse Width Modulation) mode that provide low output ripple noise  
in the normal operation and will automatically switch to PFM(Pulse  
Frequency Modulation) mode at low output loads for higher  
efficiency. Moreover, it is ideal for portable applications profited from  
Chip Enable (CE) to reduce IC off-stage current and integrated  
feedback resistor network.  
The UTC UC3750 is suitable for applications, such as PDA,  
camcorders and digital still camera, hand-held instrument, distributed  
power system, computer peripheral, conversion from four NiMH or  
NiCd or one Lithium-ion cells to 3.3V/1.8V.  
„
FEATURES  
* High efficiency: 92% (Typ.)  
* Automatic PWM/PFM switchover under light load  
* Low quiescent bias current :50μA  
* Low shutdown current:0.3μA (Typ.)  
* Output voltage:1.8V~3.3V ±2.0%  
* Low output voltage ripple:50mV (Typ.)  
* Built-in soft-start (SS)  
condition  
* Very low dropout operation, 100% max. duty cycle  
* Chip enable(CE) pin with on-chip 150nA pull-up current  
source  
* Input voltage2.45V- 5.5V  
* Pulse Width Modulation (PWM)switching  
frequency:600kHz  
* Internal under-voltage lockout (UVLO) protection  
* Low profile and minimum external components  
„
ORDERING INFORMATION  
Ordering Number  
Lead Free  
Package  
SOT-25  
Packing  
Halogen Free  
UC3750G-xx-AF5-R  
UC3750L-xx-AF5-R  
Tape Reel  
Note: xx: Output Voltage, refer to Marking Information.  
www.unisonic.com.tw  
1 of 8  
Copyright © 2011 Unisonic Technologies Co., Ltd  
QW-R502-360.b  

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