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MAX1762-MAX1791

更新时间： 2024-09-23 22:57:59
品牌 Logo 应用领域
美信 - MAXIM 电脑控制器
页数 文件大小 规格书
20页 390K
描述
High-Efficiency, 10-Pin レMAX, Step-Down Controllers for Notebooks

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MAX1762-MAX1791 数据手册

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19-1923; Rev 0; 1/01  
High-Efficiency, 10-Pin µMAX, Step-Down  
Controllers for Notebooks  
General Description  
Features  
The MAX1762/MAX1791 PWM step-down controllers  
provide high efficiency, excellent transient response,  
and high DC output accuracy needed for stepping  
down high-voltage batteries to generate low-voltage  
CPU core, I/O, and chipset RAM supplies in notebook  
computers and PDAs.  
o High Operating Frequency (300kHz)  
o No Current-Sense Resistor  
o Accurate Current Limit  
o ±±1 ꢀotaꢁ ꢂC ꢃrror oꢄer Line anꢅ ꢂuring  
Continuous Conꢅuction  
Maxim’s proprietary Quick-PWM™ pulse-width modula-  
tor is a free-running constant on-time type with input  
feed-forward. Its high operating frequency (300kHz)  
allows small external components to be utilized in PC  
board area-critical applications such as subnotebook  
computers and smart phones. PWM operation occurs  
at heavy loads, and automatic switchover to pulse-skip-  
ping operation occurs at lighter loads. The external  
high-side P-channel and low-side N-channel MOSFETs  
require no bootstrap components. The MAX1762/  
MAX1791 are simple, easy to compensate, and do not  
have the noise sensitivity of conventional fixed-frequen-  
cy current-mode PWMs.  
o ꢂuaꢁ Moꢅe Fixeꢅ Output  
±.8V/2.5V/aꢅj (MAX±762)  
3.3V/5.0V/aꢅj (MAX±79±)  
o 0.5V to 5.5V Output Aꢅjust Range  
o 5V to 20V Input Range  
o Automatic Light-Loaꢅ Puꢁse Skipping Operation  
o Free-Running On-ꢂemanꢅ PWM  
o Foꢁꢅback Moꢅe™ UVLO  
o PFꢃꢀ/NFꢃꢀ Synchronous Buck  
o 4.65V at 25mA Linear Reguꢁator Output  
o 5µA Shutꢅown Suppꢁy Current  
o 230µA Quiescent Suppꢁy Current  
o ±0-Pin µMAX Package  
These devices achieve high efficiency at a reduced  
cost by eliminating the current-sense resistor found in  
traditional current-mode PWMs. Efficiency is further  
enhanced by their ability to drive synchronous-rectifier  
MOSFETs. The MAX1762/MAX1791 come in a 10-pin  
µMAX package and offer two fixed voltages (Dual  
Mode™) for each device, 1.8V/2.5V/adj (MAX1762) and  
3.3V/5.0V/adj (MAX1791).  
Ordering Information  
________________________Applications  
PART  
TEMP. RANGE  
-40°C to +85°C  
-40°C to +85°C  
PIN-PACKAGE  
10 µMAX  
Notebooks  
Handy-Terminals  
MAX1762EUB  
MAX1791EUB  
Subnotebooks  
Digital Cameras  
PDAs  
10 µMAX  
Smart Phones  
1.8V/2.5V Logic  
and I/O Supplies  
Pin Configuration  
TOP VIEW  
Typical Operating Circuit  
V
BATT  
(5V TO 20V)  
VL  
REF  
FB  
1
2
3
4
5
10 VP  
9
8
7
6
DH  
CS  
VL  
VP  
MAX1762  
MAX1791  
MAX1762  
MAX1791  
OUT  
DL  
SHDN  
GND  
DH  
CS  
REF  
FB  
V
OUT  
1.8V/3.3V  
µMAX  
OUT  
DL  
Quick-PWM, Dual Mode, and Foldback Mode are a trade-  
marks of Maxim Integrated Products.  
SHDN  
GND  
________________________________________________________________ Maxim Integrated Products  
±
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,  
or visit Maxim’s website at www.maxim-ic.com.  
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