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MAX743CWE+ |MAX743CWEMAXN/a6avaiDual-Output, PWM Switch-Mode Regulator (5V to ±15V or ±12V)
MAX743CWE+T |MAX743CWETMAXIMN/a1000avaiDual-Output, PWM Switch-Mode Regulator (5V to ±15V or ±12V)
MAX743CWETMAXN/a1000avaiDual-Output, PWM Switch-Mode Regulator (5V to ±15V or ±12V)
MAX743EPE+MAXIMN/a1725avaiDual-Output, PWM Switch-Mode Regulator (5V to ±15V or ±12V)
MAX743EWE+ |MAX743EWEMAXIMN/a144avaiDual-Output, PWM Switch-Mode Regulator (5V to ±15V or ±12V)
MAX743EWE+ |MAX743EWEMAXN/a7avaiDual-Output, PWM Switch-Mode Regulator (5V to ±15V or ±12V)
MAX743EWE+T |MAX743EWETMAXIMN/a4000avaiDual-Output, PWM Switch-Mode Regulator (5V to ±15V or ±12V)


MAX743EWE+T ,Dual-Output, PWM Switch-Mode Regulator (5V to ±15V or ±12V)Features . Generates t10thnA or :125mA . Specs Guaranteed for ln-Circuit Performamte . {4%d0ut ..
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MAX743CWE+-MAX743CWE+T-MAX743CWET-MAX743EPE+-MAX743EWE+-MAX743EWE+T
Dual-Output, PWM Switch-Mode Regulator (5V to ±15V or ±12V)
19-2873; Rev 0: 7/90
General Description
The MAX743 DC-DC converter IC contains all the active
circuitry needed to build small, dual-output power sup-
plies. Relying on simple two-terminal inductors rather
than transformers. the MAX743 regulates both outputs
independently to within 454% over all conditions of line
voltage, temperature, and load current.
The MAX743 typically provides 75% to 82% efficiency
over most of the load range. It operates with current-
mode feedback at 200kHz, so it can be used with small,
lightweight external components. Also. ripple and noise
are easy to filter.
The MAX743 is inherently reliable due to its internal power
transistors and monolithic construction, Thermal shut-
down prevents overheating, and cycle-by-cycle current
sensmg protects the power-switch transistors. Other
features include undervoltage lock-out and programme,
ble soft-start.
Inductors, capacitors, and diodes to complement the
MAX743 can be ordered directly from Maxim in Produc-
tion quantities (page 11). An evaluation kit for prototyp-
ing (MAX743EVKIT) is also available (page 9).
If higher load currents are needed, refer to the MAX742
data sheet for a device that drives external power
MOSFETs.
Applications
DC-DC Converter Module Replacement
Distributed Power Systems
Computer Peripherals
Portable Instruments
Pin Configuration
iM] gEb'aLA]Al
Dual-Gutput, Swnelhy4gilodle Regulator
Hsl!f to i151! or i121!)
Features
. Generates t100mA or 1125mA
. Specs Guaranteed for In-Circuit Performance
. 14% Output Tolerance Max Over Temp, Line, and
. 82% Typ Efficiency
0 Low-Noise, Current-Mode Feedback
. On-Board Current Limiting
. Thermal Shutdown Protection
. Undervoltage Lock-Out and Soft-Start
. Switches From :15V to t12V Under Logic
Control
. Evaluation Kit Available
. Internal Power MOSFETs
Ordering Information
TOPVIEW
cc. b] q V 1:6] F3.
AGND L2: MAXIM E] tG
AN/r [jf MAX743 3] GND
v.’ Li, Li] v.
vu [h El vl
VREF E 1:1] 12/)
ss E j_Toj LX-
co. Lis, ji] Fil.
DIP/SO
'NOT CONNECTED FOR CERDIP PACKAGE
PART TEMP. RANGE PIN-PACKAGE
MAX743CPE Jc 15%) 7 16 Plastic DIP
"isAxr4:3cwe 0''C to +766 16 Wide so
MAX743C/D " to +70''C Dice
WAX 743EPE 407C to +850 16 Plastic DIP -
MAjd43EWE -40°c to +850 16 Wide so
"MAX74:3MJE -55‘c 16+125°c 16 CERDlP
Ordering information continued on page 1 1.
Typical Operating Circuit
V. - -
co, l E J,
001111 U 100ml
_ CG HI, 1 .v0
AGND m a L
H A)/+ GND 1 DX+ T 10un
Ir) V+ v. HT l, Cl
' v. v. 9 J1 ' 100g
C3 1hsfr-ii-'-- VREF 12/6 --l, - 4,11
ca IVr--)h'- ss LX- M = I/f
s-O-- cc- Ffl. M J CF
Ity MAXIM 31301111 ' 1UhsF
MAX743 -
9MM3COM
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 .

Dual-Output, Switch-Mode Regulator
l+Stf to i151! or $12!!)
a ELECTRICALCHARACTERISTICS
Fit' (Circuit of Figure l, +4.5v < V+ < +5.5v. Note1.)
bl PARAMETER L CONDITIONS I MIN TYP MAX UNITS
st Output Voltage -4
0mlL< ILOAD < 100mA TA = +25'C 14,55 - 15.45
E l 5 Mode 12/15 = 0V TA = TMIN to TMAX 1440 15.60
OMA.< ILOAD < 125mA TA = +2S'C 11 64 12.36
tl - v
2V Mode 12/15 = Vs, TA = TMIN to TMAX 1152 12.48
ELECTRICAL CHARACTERISTICS
(Circuit of Figure l, V+ = +5.0V. 12/75 pin = OV, ILOAD = 0, TA = TMIN to TMAx. unless otherwise noted.)
PARAMETER CONDITIONS MIN TYP MAX 1 UNITS
Efficiency ILOAD = t50rnA ____LX = MAXLOO1 - - - ___-dr-sc-__, 79 %
Lit-- MPP Toroud 82 ( -
Supply Current (Note 2) 7 2O - r 30 _ - mA -
Standby Current VREF = +5V. includes VRE_F current l - i 2 - l mA
Line Regulation V+ = +4.5v to +5,5v L L o 05 _ 7 %/%
Load Regulation ILOAD = 0 to 100mA E 1 %
Reference Voltage VREF 1 2.0 V
Oscillator Frequency 170 200 23L kHz
Undervoltage Lock-Out Measured at V+ 3.8 - - - i 72 - - V
Thermal Shutdown Threshold I .1907 K
LX+ On Resistance (Note 3) W 1 2 3 0 n
LX- On Resistance (Note 3) 1 0 22 n
LX+ Leakage Current (Note 4) LX+ = MN. V+ = 6V 100 PA"
-LX, LeakagtCurrent (Note 4) LX- = .17v. V+ = 6V, - fui0 pA
Compensation Pin Impedance 00+, CC- 10 7 i A MI - -
Soft-Start Source Current ss = ov 3.0 7 O pA
Soft-Start Sink Current ss = 2v. V+ = 3.8V - AL _o.5 2,6 _ 1 mA
Note 1: All devices tested to full-load conditions with 50ms pulsed loads using automatic test equipment. In continuous operation. the
maximum allowable output current is determined by package thermal characteristics and passwe component ratings
Note 2: Total supply current including inductor current. The worst case for supply current occurs al low input voltage,
Note 3: Guaranteed by design, not 100% tested. Output currents are 100% tested.
Note 4: Tested at wafer level only, not in packaged form.
2 MAXIM

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