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The MAX751 is a +5V-output, CMOS, step-up, switch-
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MAX751CPA-MAX751CSA-MAX751ESA
+5V-Output, Step-Up, Current-Mode PWM DC-DC Converter
19-0008; Rev 1; 11/96
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A +5V-Output, Step-Up, Current-Mode PWM
Dc-Dc Converter
aonaral Doocrlptlon
The MAX751 is a ttN-output, CMOS, step-up, switch-
mode DC-DC converter. Minimum input start-up voltage
is 1.2V. From a 2.7V supply, the output current capability
is guaranteed to be 150mA. Battery-saving features
include 86% typical full-load efficiency, 2mA operating
quiescent supply current, and 35pA shutdown supply
current. The shutdown mode can be directly controlled
by a microprocessor via the logic-compatible SHDN pin.
The MAX751 is tested in-circuit, so output power speci-
fications are guaranteed over all line, load, and temper-
ature ranges. The typical operating circuit uses tiny
surface-mounted components, including a miniature
22pH inductor, and fits into less than 0.5in2.
The MAX751 uses current-mode pulse-width modulation
(PWM) control to provide precise output regulation and
low subharmonic noise. A fixed 170kHz oscillator fre-
quency facilitates ripple filtering and allows for the use of
tiny external capacitors.
For higher-current solutions, refer to the MAX731/MAX752 and
MAX848/MAX849 data sheets and evaluation kit manuals. The
MAX751 can be evaluated using the MAX731 evaluation kit
(order MAX731EVKT-DF and a sample of the MAX751CPA).
Features
O MN Procot Output
t Guaranteed 150mA Output Current
. 1.2V Start-Up Supply Voltage
. 86% Typical Emtthtrtttkta at Full Load
Inductor - No Component
Dnlgn oqulred
. 2mA Quiescent Current
. MPA Loglo-Controliod Shutdown Mode
. Overcurront and Soft-Start Protocilon
. thhtHg High-Froquoncy Curroot-Modo PWM
. Small 22
-rr-NPs, " "'"
. 8-Pln DIP and so Packages
Ordering Information
PART TEMP. RANGE PIN-PACKAGE
MAX751CPA O'C to +70'C 8 Plastic DIP
MAX751CSA O'C to +70'C 8 SO
MAX751C/D JC to +70'C Dice'
MAX751EPA M0'C to +850 8 Plastic DIP
MAX751ESA -40'C to +85'C 8 SO
MAX751MJA -55'C to +125'C 8 CERDIP"
Applications
Local +5V Supply in +3V-Only Systems
Cellular Phones
. Dice are tested at TA x +25'C.
"Contact factory " availability and processing tty MIL-STD-883.
RF Transmitter Supply - Typical Application Circuit
Palmtop and Notebook Computers
Battery-Powered and Hand-Held Instruments "
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MM 75 11
+StNthiatput, Sitapulltp, Currentt-Mode PWM
IlMNllMt Converter
ABSOLUTE MAXIMUM RATINGS
V+, LX to GND ........................... -0.3V to +17V
VOUT to GND ................................... I25V
SS. CC. SHDN to GND ............... +0.3V to (V+ + 0.3V)
Peak Switch Current (ILX) .......................... 1.5A
Reference Current (lvREF) ........................ 2.5mA
Continuous Power Dissipation (TA = +70'C)
Plastic DIP (derate 9.09mW/‘C above +70‘C) ...... 727mW
Wide so (derate 5.88mWI' C above +70'C) ........ 471mW
CERDIP (derate 8.00mWI'C above 70'C) .......... 644mW
Stresses
Operating Temperature Ranges:
MAX751C_ - ............................ O'C to +70'C
MAX751E_ - ........................... -40'C to +85'C
MAX751MJA ......................... -55'C to +125‘C
Junction Temperatures
MAX751C_ -t. - ............................ +150'C
MAX751MJA ................................ +175‘C
Storage Temperature Range .............. -65.' C to +1titrC
Lead Temperature (soldering, 10 sec) .............. +300'C
d those listed under 'Absolute Maximum Ratings'may cause permanent damage to the device. These are stress ratings only, and functimal
operation a 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 reliabilily.
ELECTRICAL CHARACTERISTICS
(Circuit of Figure I, VIN = +3V. ILOAD = OmA, TA = TMIN to TMAX, typical values are at TA = +25'C. unless otherwise noted.)
PARAMETER CONDITIONS MIN TYP MAX UNITS
MAX751C 1.2 1.8
)e,tt1t1i2,r'up lLOAD = 0m MAX751E/M Id 2.2 v
p g ILOAD = 150mA MAX751C 2.2 2.7
MAX751E/M 2.2 3.0
Output Voltage (Notes 1, 2) VIN = 2.7V to 5V, OmA < ILQAD < 150mA 4.75 5.00 5.25 V
Output Current VIN = 2.7V to 5V 150 200 mA
Line Regulation VIN ' 2.7V to 4.5V 0.20 %N
Load Regulation ILOAD = 0mA to 100rnA 0.005 %/mA
Efficiency " = 3.0V. ILQAD = 150mA 86 %
Supp/Current Includes switch current 2.0 3.5 tttA
St a n dby Current SHDN = 0V, 'entire circuit 35 100 pA
SHDN = OV, into V+ 6
s7iirN Input Threshold Irmut voltagg high to V
Input voltage low 0.25
TYTD-N Input Leakage Current 1.0 M
LX On Resistance 0.75 n
LX Leakage Current Vos = 5V 1.0 PA
Reference Voltage 1.23 V
Reference Drift 50 pprpr C
Oscillator Frequency 170 kHz
Compensation Pin Impedance 20 kn
Note t: Circuit will regulate properly with an input voltage as high as 5.25V due to the voltage drop across the external diode.
Note 2: Load-current capability is after start-up.
