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UCC3585 PDF预览

UCC3585

更新时间: 2024-11-07 22:52:39
品牌 Logo 应用领域
德州仪器 - TI 控制器
页数 文件大小 规格书
10页 142K
描述
Low Voltage Synchronous Buck Controller

UCC3585 数据手册

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UCC2585  
UCC3585  
PRELIMINARY  
Low Voltage Synchronous Buck Controller  
FEATURES  
DESCRIPTION  
Resistor Programmable 1.25V to 4.5V The UCC2585/UCC3585 synchronous Buck controller provides flexible  
VOUT  
high efficiency power conversion for output voltages as low as 1.25V with  
guaranteed ±1% DC accuracy. Output currents are only limited by the  
choice of external logic level MOSFETs. With an input voltage range of  
2.5V to 6.0V it is the ideal choice for 3.3V only, battery input, or other low  
voltage systems. Applications include local microprocessor core voltage  
power supplies for desktop and Notebook computers, and high speed GTL  
bus regulation. Its fixed frequency oscillator is capable of providing practical  
PWM operation to 700kHz.  
2.5V to 6V Input Supply Range  
1% DC Accuracy  
High Efficiency Synchronous  
Switching  
Drives P-channel (High Side) and  
N-channel (Low Side) MOSFETs  
With its low voltage capability and inherent “always on” operation, the  
UCC2585/UCC3585 causes VOUT to track VIN once VIN has exceeded  
the threshold voltage of the external P channel MOSFET. Tracking can be  
tailored for any application with a single resistor or disabled by connecting  
TRACK to VIN. For dual supply rail microprocessors this feature negates  
the need for external diodes to insure supply voltage tracking between the  
+3.3V and lower voltage microprocessor core supplies.  
Lossless Programmable Current Limit  
Logic Compatible Shutdown  
Programmable Frequency  
Start-up Voltage Tracking Protects  
Dual Rail Microprocessors  
(continued)  
TYPICAL APPLICATION DIAGRAM  
VIN  
C8  
0.47µF  
R3  
27.4k  
R1  
10k  
+
+
15 VIN  
CLSET  
8
R5  
3
C1  
C2  
Q1  
IRF7404  
150µF 150µF  
1
2
4
ENB  
PDRV 12  
C7  
147pF  
R2  
549k  
L1 4.7µF  
COMP  
VFB  
ISENSE 11  
NDRV 14  
VOUT  
R6  
3
Q2  
IRF7401  
+
+
+
C11  
C9  
C10  
220µF  
220µF  
220µF  
10 SD  
TRACK  
N/C  
6
9
C4  
3.2N  
R10  
36k  
R12  
32k  
3
SS  
C5  
0.22µF  
16 CT  
PWRGND 13  
C6  
470pF  
7
ISET  
GND  
5
R11  
82k  
R4  
100k  
RTN  
RTN  
UDG-98024  
07/99  

UCC3585 替代型号

型号 品牌 替代类型 描述 数据表
LM2745 TI

功能相似

LM2745 / LM2748 Synchronous Buck Controller with Pre-Bias Startup, and Optional Clock

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