MAX731EWE ,+5V/Adjustable Step-Up Current-Mode DC-DC ConvertersApplications
+5V-Logic Supply in +3V-Logic System
DC-DC Converter Module Replacement
Portable ..
MAX731EWE ,+5V/Adjustable Step-Up Current-Mode DC-DC ConvertersGeneral Description
The MAX731 and MAX752 are fixed and adjustable
CMOS, step-up, DC-DC switch- ..
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MB6021A ,SINGLE CHIP CODEC WITH FILTERSFUJITSU hTCRoirLECTR()NTCS 31.5 D, " 37u=17aa 001.71.55 =1 "hu
April 1990
Edition 3.0
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MB6022 , Product Summary Prototyping Kits
MB6022 , Product Summary Prototyping Kits
MAX731CPA-MAX731EWE-MAX732EWE
+5V/Adjustable Step-Up Current-Mode DC-DC Converters
2hyllADalAAl
+5V/Adjustable Step-Up
GurrenbModle Dc-Dc Converters
General Description
The MAX731 and MAX752 are fixed and adjustable
CMOS, step-up, DC-DC switch-mode regulators. The
MAX731 accepts a positive input voltage between +2.51/
and +5.25V and converts it to a fixed +5V at 200mA,
guaranteed over temperature. Typical full-load efficien-
cies are 82% to 87%. It requires a single inductor value
of 22pH to function over the entire range, so no inductor-
related design is necessary. The MAX752 is an adjusta-
ble version that converts a minimum of +1.8V to any
higher voltage up to +15V, at up to 200mA. Typical
full-load efficiencies are 85% to 95%. A single 50pH
inductor is suitable for the entire range of operating
conditions, so no inductor-related design is necessary,
The MAX731/MAX752 use current-mode pulse-width
modulation (PWM) controllers to provide precise output
regulation and low subharmonic noise. Typical no-load
supply current is 2mA. A fixed 170kHz oscillator fre-
quency allows easy filtering of ripple and noise, and
provides for small external components.
The MAX731/MAX752 feature cycIe-by-cycle current lim-
ling, overcurrent limiting, external shutdown, and pro-
grammable soft-start protection.
For fixed +12V and +15V step-up regulators, refer to the
MAX732/MAX733 data sheet. For k:)wer-power step-up
applications, refer to the MAX631/632/633 and MAX654-
659 data sheets.
Applications
+5V-Logic Supply in +3V-Logic System
DC-DC Converter Module Replacement
Portable Instruments
Laptop Computers
Distributed Power Systems
Cellular Phones
Battery-Powered Equipment
Pin Configurations
Features
. 200mA Load Currents Guaranteed wlth
No External MOSFET
. Step-Up from a 2.5V Input
0 170kHz High-Frequency Current-Mode PWM
. 82% to 87% Typical Etfielentties at Full Load
(MAX731)
. 85% to 95% Typical Emeieneles at Full Load
(MAX752)
. Small Inductor - No Component Design Required
. 2mA Quiescent Current (MAX752)
. Overcurrent and Soft-Start Protection
. 8-Pin DIP, 16-Pln Wide so Packages
. Shutdown Pln
Ordering Information
PART TEMP. RANGE PIN-PACKAGE
,luAX731cPA 0°C to not 8 Plastic DIP
MAX731CWE o’c to not 16 Wide so
MAX731C/D 0°C to +70'C Dice'
MAX731EPA -40°C to +850 8 Plastic DIP
MAX731EWE -40"C to +85°C 16 Wide so
LMA><731MJA -55°c to +125°c 8 cEmyr- -
Ordering information continued on last page.
. Dice are tested at TA = 4-250 only.
"Contact factory for availability and processing to MIL-STD-883.
Typical Application Circuit
T0 _ t
A) 25V l
L T 2flpH
s-H-oi; ’ +5V,200rrA
TOPVIEW LX -
. MAXIM
SFO-N [I T. v. MAX731 v.
VREF i MAX731 El Vot)r(N C) Vout _1
ss a MAX752 Fl LX cc
cc LI 5 GND SIS (mo VREF 1:150“
( )AREFOR MAX752 MP _ -l; l l
SOimlastpage = T
MAXIM Maxim Integrated Products 1
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MAX 73 1 MAX 752
"tf/Aefg"usitarttfe Step-Up
GurrenbModle Dc-DC Converters
ABSOLUTE MAXIMUM RATINGS
V+, LX to GND ........................... -O.3V to +17V
VOUT to GND F__V.P__Pl__P...__l.P.__V.... i25V
ss, CC. SHDN to GND ................ -0.3V to (V+ + 0.3V)
Peak Switch Current (ILx) .......................... 1.5A
Reference Current (IVREF) 'F-_..-.- 2.5mA
Continuous Power Dissipation (TA = +70'C)
8-Pin Plastic DIP(derate 9.09mW/‘C above +70'C) . 727mW
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:
MAX731/752C_ _ ....................... 0''C to +700
MAX731/7525_ _ ..................... -40°C to +85°C
MAX731/752MJA .................... -55'C to +125'C
Junction Temperatures:
MAX731/752C_ _/E_ - ......................... +150'C
MAX731/752MJA ............................. +175°C
Storage Temperature Range .............. Ai5"C to +160"C
Lead Temperature (soldering, 10 sec) .............. +300°C
Stresses tr,',',','', those listed under "Absolute Maximum Ratings' may cause permanent damage to the device, These are stress ratings only, and functional
operation 0 the device at these or any other conditions beyond those indicated in the operational seciions of the specifications is not implied. Exposure to
absolute maXImum rating conditions tor extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS " MAX731
(Circuit ot Figure la, VIN = WN, ILOAD = 0mA, TA = TMIN to TMAX, typical values are at TA = +25'C, unless otherwise noted.)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Start-Up Input Voltage ILOAD = 0mA 1.8 V
ILOAD = 200mA 2.0 2.5
Minimum Operating Voltage. VIN ILOAD = 100mA m V
ILOAD = 200mA 2.0
OutputVoltage (Note 1) VIN = 2.7V to 4.65V. OmA < ILOAD < 200mA 4.75 5.00 5.25 V
Output Current 200 mA
Line Regulation VIN = 2.7V to 4.65V 0.20 %/V
Load Regulation ILOAD = 0mA to 100mA 0.005 %/rnA
Efficiency VIN = 3V, ILOAD = 100mA 87 %
Supply Current Includes switch current 2.0 4.0 mA
S-H-D-N' = 0,en1ire circuit 35 100
Standby Current - _ pA
SHDN = 0, into V+ 6
Shutdown Input Threshold V'H _ Vo - os v
VIL 0.25
Shutdown Input Leakage Current 1.0 pA
Short-Circuit Current 1.5 A
LX On Resistance 0.5 n
LX Leakage Current VDs = 5V IO pA
Reference Voltage 1.15 1.23 1.30 V
Reference Drift TA = TMIN to TMAX 50 ppm/T
Oscillator Frequency 125 170 215 kHz
gmpensation Pin Impedance 20 k9
Note 1: Circuit will regulate properly with input voltage as high as 5.25V due to voltage drop across the external diode.
