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Part: MAX730AEPA
Category:
Power Management
-> Battery Management
Description: MAX730A, MAX738A, MAX744A 5V, Step-Down, Current-mode PWM DC-DC Converters
Company: Maxim Integrated Products
Datasheet: Download MAX730AEPA datasheet File size : 569 kB
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Datasheet text preview:
19-0165; Rev 2; 1/96
5V, Step-Down, Current-Mode PWM DC-DC Converters
__________________General Description
T h e MAX730A/MAX738A/MAX744A are 5V-output CMOS, step-down switching regulators. The MAX738A/ MAX744A accept inputs from 6V to 16V and deliver 750mA. The MAX744A guarantees 500mA load capability for inputs above 6V and has tighter oscillator frequency limits for low-noise (radio) applications. The MAX730A accepts inputs between 5.2V and 11V and delivers 450mA for inputs above 6V. Typical efficienc i e s are 85% to 96%. Quiescent supply current is 1.7mA and only 6µA in shutdown. Pulse-width modulation (PWM) current-mode control provides precise output regulation and excellent transient responses. Output voltage accuracy is guaranteed to be ±5% over line, load, and temperature variations. Fixed-frequency switching allows easy filtering of output ripple and noise, as well as the use of small external components. These regulators require only a single inductor value to work in most applications, so no inductor design is necessary. The MAX730A/MAX738A/MAX744A also feature cycleby-cycle current limiting, overcurrent limiting, undervoltage lockout, and programmable soft-start protection.
________________________________Features
o 750mA Load Currents (MAX738A/MAX744A) o High-Frequency, Current-Mode PWM o 159kHz to 212.5kHz Guaranteed Oscillator Frequency Limits (MAX744A) o 85% to 96% Efficiencies o 1.7mA Quiescent Current o 6µA Shutdown Supply Current o Single Preselected Inductor Value, No Component Design Required o Overcurrent, Soft-Start, and Undervoltage Lockout Protection o Cycle-by-Cycle Current Limiting o 8-Pin DIP/SO Packages (MAX730A)
MAX730A/MAX738A/MAX744A
_________________Ordering Information
PART MAX730ACPA MAX730ACSA MAX730AC/D MAX730AEPA MAX730AESA MAX730AMJA TEMP. RANGE 0°C to +70°C 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C -55°C to +125°C PIN-PACKAGE 8 Plastic DIP 8 SO Dice* 8 Plastic DIP 8 SO 8 CERDIP
___________________________Applications
Portable Instruments Cellular Phones and Radios Personal Communicators Distributed Power Systems Computer Peripherals
Ordering Information continued at end of data sheet. *Contact factory for dice specifications.
__________Typical Operating Circuit
6 INPUT V TO 16V 68µF V+ 33µH LX OU5 PUT T V
_________________Pin Configurations
TOP VIEW
MAX738A AX744A
ON/OFF SHDN OUT
100µF
SHDN 1 REF 2
8 7
V+ LX GND OUT
SS 3 CC 4
MAX730A MAX738A AX744A
DIP
6 5
REF SS GND
CC
Pin Configurations continued on last page.
________________________________________________________________ Maxim Integrated Products
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For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
5V, Step-Down, Current-Mode PWM DC-DC Converters MAX730A/MAX738A/MAX744A
ABSOLUTE MAXIMUM RATINGS
Pin Voltages V+ (MAX730A) ......+12V, -0.3V V+ (MAX738A/MAX744A) ....+18V, -0.3V LX (MAX730A) .........(V+ - 12V) to (V+ + 0.3V) LX (MAX738A/MAX744A) .......(V+ - 21V) to (V+ + 0.3V) OUT .........±25V SS, CC, SHDN ........-0.3V to (V+ + 0.3V) Peak Switch Current (ILX) ........2A Reference Current (IREF) .........2.5mA Continuous Power Dissipation (TA = +70°C) 8-Pin Plastic DIP (derate 9.09mW/°C above +70°C)...727mW 8-Pin SO (derate 5.88mW/°C above +70°C) ......471mW 16-Pin Wide SO (derate 9.52mW/°C above +70°C) .....762mW 8-Pin CERDIP (derate 8.00mW/°C above +70°C) .......640mW Operating Temperature Ranges: MAX7_ _AC_ _....0°C to +70°C MAX7_ _AE_ _ .......-40°C to +85°C MAX7_ _AMJA ....-55°C to +125°C Junction Temperatures: MAX7_ _AC_ _/AE_ _.........+150°C MAX7_ _AMJA....+175°C Storage Temperature Range ....-65°C to +160°C Lead Temperature (soldering, 10sec).....+300°C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 3, V+ = 9V for the MAX730A, V+ = 12V for the MAX738A/MAX744A, ILOAD = 0mA, TA = TMIN to TMAX, unless otherwise noted.) PARAMETER CONDITIONS 0mA < ILOAD < 450mA, MAX730AC V+ = 6.0V to 11.0V 0mA < ILOAD < 450mA, MAX730AE 0mA < ILOAD < 300mA, MAX730AM 0mA < ILOAD < 450mA, MAX738AC/AE V+ = 6.0V to 16.0V 0mA < ILOAD < 350mA, MAX738AM 0mA < ILOAD < 500mA, MAX744AC/AE 0mA < ILOAD < 375mA, MAX744AM V+ = 10.2V to 16.0V, 0mA < ILOAD < 750mA 0mA < ILOAD < 750mA, MAX744AC/AE 4.75 5.00 0mA < ILOAD < 600mA, MAX744AM 5.2 V+ = 5.2V to 11.0V V+ = 6.0V to 16.0V 0.15 0.15 0.15 11.0 6.0 16.0 6.0 16.0 V %/V 5.25 4.75 5.00 5.25 4.75 5.00 5.25 MAX730A MIN TYP MAX MAX738A MIN TYP MAX MAX744A MIN TYP MAX UNITS
Output Voltage
4.75 5.00
5.25
4.75 5.00
5.25
V
V+ = 9.0V to 16.0V
Input Voltage Range Line Regulation
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5V, Step-Down, Current-Mode PWM DC-DC Converters
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 3, V+ = 9V for the MAX730A, V+ = 12V for the MAX738A/MAX744A, ILOAD = 0mA, TA = TMIN to TMAX, unless otherwise noted.) PARAMETER Load Regulation Efficiency CONDITIONS ILOAD = 0mA to 300mA ILOAD = 0mA to 750mA V+ = 9.0V, ILOAD = 300mA V+ = 12V, ILOAD = 750mA 1.7 V+ = 6.0V to 9.0V Supply Current (includes switch current) V+ = 9.0V to 12.0V V+ = 12.0V to 16.0V Standby Current Shutdown Input Threshold Shutdown Input Leakage Current Short-Circuit Current Undervoltage Lockout LX On Resistance LX Leakage Current Reference Voltage Reference Drift 130 Oscillator Frequency Compensation Pin Impedance V+ = 6.0V to 16.0V MAX744AC/AE MAX744AM 7500 7500 V+ rising V+ falling ILX = 500mA V+ = 12V, LX = 0V V+ = 12V, TA = +25°C 0.5 1.0 1.15 1.23 50 170 210 130 1.30 0.5 1.0 1.15 1.23 50 160 190 159.0 185.0 212.5 159.0 7500 216.5 kHz 1.30 1.5 4.7 5.2 MAX744AC/AE MAX744AM MAX744AC/AE MAX744AM MAX744AC MAX744AE MAX744AM SHDN = 0V (Note 1) VIH VIL 2.0 0.25 1.0 1.5 5.7 6.0 5.0 0.5 1.0 1.15 1.23 50 1.30 6.0 100.0 2.0 0.25 1.0 1.5 5.7 6.0 5.7 6.0 100.0 2.0 0.25 1.0 6.0 3.0 92 MAX730A MIN TYP MAX 0.0005 0.0005 90 87 1.7 3.0 0.0005 90 87 1.7 1.2 3.0 2.5 3.0 3.0 3.5 4.0 4.3 4.5 100.0 µA V µA A V µA V ppm/°C mA MAX738A MIN TYP MAX MAX744A MIN TYP MAX UNITS %/mA %
MAX730A/MAX738A/MAX744A
Note 1: The standby current typically settles to 25µA (over temperature) within 2 seconds; however, to decrease test time, the part is guaranteed at a 100µA maximum value.
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