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PDF ( 数据手册 , 数据表 ) M7085

零件编号 M7085
描述 PFM STEP-DOWN DC-DC CONTROLLER
制造商 Unisonic Technologies
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M7085 数据手册, 描述, 功能
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UNISONIC TECHNOLOGIES CO., LTD
M7085
PFM STEP-DOWN DC-DC
CONTROLLER
CMOS IC
DESCRIPTION
The UTC M7085 step-down DC-DC Controller is optimized for
use with a power PMOSFET. It utilize a Pulse-Frequency
Modulation (PFM) control scheme that implies high efficiency
operation at light loads.
There are two user-selectable over-current protection methods
one provides over-current protection by taking advantage of the
RDS(ON) of the P- Channel. The other provides accurate over-current
protection with the use of an external sense resistor. The
cycle-by-cycle current limit threshold can be adjusted with a
external resistor.
FEATURES
* High efficiency 90% and up is possible
* Low dropout operation 100% duty cycle
* Maximum operating frequency > 1MHz
* Two methods of over-current protection
* 4.5V ~ 35V wide input range
* 1.24V ~ VIN adjustable output range
ORDERING INFORMATION
Order Number
Normal
Lead Free Plating
M7085-SM1-R
M7085L-SM1-R
M7085-SM1-T
M7085L-SM1-T
Package
MSOP-8
MSOP-8
MSOP -8
*Pb-free plating product number: M7085L
Packing
Tape Reel
Tube
M7085L-SM1-R
(1)Packing Type
(2)Package Type
(3)Lead Plating
(1) R: Tape Reel, T: Tube
(2) SM1: MSOP-8
(3) L: Lead Free Plating, Blank: Pb/Sn
www.unisonic.com.tw
Copyright © 2005 Unisonic Technologies Co., Ltd
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M7085 pdf, 数据表
M7085
CMOS IC
APPLICATION INFORMATION(Cont.)
P-Channel MOSFET Selection(Q1)
An external P-Channel power MOSFET must be used the UTC M7085 key selection criteria for the power for the
P-Channel are the maximum Drain-Source voltage (VDS) MOSFET are the gate threshold, VGS, the “ON” resistance,
RDS(ON) and its total gate charge.
The voltage across the PFET when it is turned off is equal to the sum of the input voltage and the diode forward
voltage. The VDS must be selected to provide some margin beyond the input voltage.
RDS(ON)determines the conduction losses for each switching cycle, the lower the ON resistance, the higher the
efficiency can be chivied.
A power MOSFET with lower gate charge can give lower switching losses but the fast transient can cause
unwanted EMI to the system. Compromise in between is required during the design stage. keeping the gate
capacitance below 2000pF is recommended.
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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