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MAX1960

更新时间： 2024-11-05 21:55:11
品牌 Logo 应用领域
美信 - MAXIM 控制器
页数 文件大小 规格书
29页 453K
描述
2.35V to 5.5V, 0.5% Accurate, 1MHz PWM Step-Down Controllers with Voltage Margining

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19-2740; Rev 0; 1/03  
2.35V to 5.5V, 0.5% Accurate, 1MHz PWM  
Step-Down Controllers with Voltage Margining  
General Description  
Features  
The MAX1960/MAX1961/MAX1962 high-current, high-  
efficiency voltage-mode step-down DC-DC controllers  
operate from a 2.35V to 5.5V input and generate output  
voltages down to 0.8V at up to 20A. An on-chip charge  
pump generates a regulated 5V for MOSFET drive.  
Additionally, adaptive dead-time drivers allow a  
wide variety of MOSFETs to be used without risking  
shoot-through.  
o 0.5% Accurate Output  
o Operates from 2.35V to 5.5V Supply  
o Generates Low Output Voltage Down to 0.8V  
o On-Chip Charge Pump Provides 5V Gate Drive  
o Ceramic or Electrolytic Capacitors  
o 94% Efficiency  
o External Synchronization from 450kHz to 1.2MHz  
o 500kHz/1MHz Fixed-Frequency PWM Operation  
o Fast Transient Response  
Fixed-frequency PWM operation and external synchro-  
nization make these controllers suitable for telecom  
and datacom applications. The operating frequency is  
programmable to either 500kHz or 1MHz, or from  
450kHz to 1.2MHz with an external clock. A clock output  
is provided to synchronize another converter for 180°  
out-of-phase operation. A high closed-loop bandwidth  
provides excellent transient response for applications  
with dynamic loads.  
o Two Converters Can Operate 180° Out-of-Phase  
o
4% Voltage Margining for System Test  
o 10% Accurate Current Sensing (MAX1962)  
o Adaptive Dead Time Prevents Shoot-Through  
Lossless current sensing in the MAX1960 and  
MAX1961 is achieved by monitoring the drain-to-source  
voltage of the low-side external FET. The current limit is  
scalable to accommodate a wide variety of MOSFETs  
and load currents. The MAX1962 has 10% accurate  
sense-resistor-based current limiting.  
Ordering Information  
PART  
MAX1960EEP  
MAX1961EEP  
MAX1962EEP  
TEMP RANGE  
-40°C to +85°C  
-40°C to +85°C  
-40°C to +85°C  
PIN-PACKAGE  
20 QSOP  
20 QSOP  
20 QSOP  
The MAX1960 and MAX1962 have an adjustable output  
voltage from 0.8V to 4.95V. The MAX1961 and  
MAX1962 have four preset output voltages (1.5V, 1.8V,  
2.5V, and 3.3V) and feature 0.5% voltage accuracy  
over temperature, line, and load variations. The  
MAX1960 and MAX1961 also feature voltage-margining  
control inputs that shift the output voltage up or down  
by 4% for system testing.  
Typical Operating Circuit  
C+  
C-  
AV  
INPUT  
2.35V TO 5.5V  
V
DD  
CC  
MAX1960  
V
DD  
CTL1  
VOLTAGE  
MARGINING  
AND ON/OFF  
BST  
DH  
Applications  
ASIC, FPGA, DSP, and CPU Core and I/O Voltages  
CTL2  
COMP  
OUTPUT  
IN  
UP TO 20A  
0.8 TO 0.87 ✕ V  
Cellular Base Stations  
LX  
REF  
Telecom and Network Equipment  
Server and Storage Systems  
DL  
GND  
PGND  
ILIM  
FB  
FSET/SYNC  
CLKOUT  
OPTIONAL  
SYNCHRONIZATION  
CLKOUT  
180° OUT-OF-PHASE  
Pin Configurations and Selector Guide appear at the end  
of the data sheet.  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at  
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.  
1234567...29

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