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MAX743CPEMAXIMN/a14avaiDual-Output, Switch-Mode Regulator(+5V to +-15V or +-12V)
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MAX743CPE-MAX743CWE-MAX743EPE-MAX743EWE
Dual-Output, Switch-Mode Regulator(+5V to +-15V or +-12V)
19-2873: Rev 0; 7/90
AM] 2110i'ClheAy1]
Duabahugipuil, SwnittlhMOttdle Regulator
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 h4% 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
sensing protects the power-switch transistors. Other
features include undervoltage lock-out and programma-
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
(+517 to --t-AMiRf 01 cb.tUHlfll
Features
0 Generates i100mA or t125mA
. Specs Guaranteed for ln-Clrcult Performance
. {4%d0utput Tolerance Max Over Temp, LIne, and
t 82% Typ Efficiency
' Low-Nolse, Current-Mode Feedback
t On-Board Current Llmltlng
. Thermal Shutdown Protectlon
. Undervoltage Lock-Out and Soft-Start
. Switches From MIN to i12V Under Logic
Control
. Evaluation Kit Avallable
0 Internal Power MOSFETs
Ordering Information
PART TEMP. RANGE PIN-PACKAGE
MAX743CPE CC to +70''C 16 Plastic DIP
MAX743CWE tYC to +70''C 16 Wide so
MAX743C/D 0'C to +70''C Dice
MAX 743EPE -40''C to +850 16 Plastic DIP
MAX743EWE -40'C to +85''C 16 Wide so
MAX743MJE -55''C to +125°C 16 CERDIP
Pin Configuration
TOP VIEW
CC+ II . V E] F8+
AGND E MAXIM E tA+
AV+ E MAX743 E GND
W' E Ca] V+
W" E El "
VREF [E E] 12/17;
ss E E LX-
cc- [E E FB-
DlP/SO
. NOT comma) FOR canon) PACKAGE
Ordering information continued on page 11.
Typical Operating Circuit
CG E LX+
0.01mt h.2 liMsh
--0-- CC+ FB+
AGND LX+ I L {o
'-1 AV+ GND 1 DG cl; gy
065117: " Ile - Cl, Cl
. " V+ -ir J1 . 100“;
ca 10WFr--h'-- VREF mg _L_0_I_i
041,0pF._)r_ SS LX- u = 4:0
s--] (T- Fil- ox CF
01%"; MAXIM ElLémH --. ‘W
MAX743 - --
& the latest literature: http://,
Maxim Integrated Products 1
£13712 WW
MAX7413
ilG)uaba)uitpuit, SwiiteihAi8httdle Regullaihtw
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ELECTRICAL CHARACTERISTICS
(Circuitof Figure l, +4.5V < V+ < +5.5V, Note1.)
PARAMETER I CONDITIONS MIN TYP MAX UNITS
Output Voltage
TA = +25''C 14.55 15.45
:15v Mode Irp/h-
- TA = TMIN to TMAX 14.40 15.60
0mAe:lLOAD<125mA TA--- +25“C 11.64 12.36
k12N/ Mode V
12/15 = V+ TA = TMIN to TMAX 11.52 12.48
ELECTRICAL CHARACTERISTICS
(Circuit of Figure l, V+ = +5.0V, 12/T5 pin = OV, ILOAD = o, TA = TMIN to TMAx. unless otherwise noted.)
PARAMETER fl CONDITIONS _ MIN TYP MAX UNITS
Efficiency ILOAD = ue50mA LX = MAXL001 79 %
LX = MPP Toroid 82
Supply Current (Note 2) 20 30 mA
Standby Current VREF = +5V, includes VREF current 2.2 4 mA
Line Regulation V+ = +4.5V to +5.5V 0.05 %/%
Load Regulation ILOAD = 0 to 100mA 1 %
Reference Voltage VREF 2.0 V
Oscillator Frequency 170 200 230 kHz
Undervoltage Lock-Out Measured at V+ 3,8 4.2 V
Thermal Shutdown Threshold + 190 'C
LX+ On Resistance (Note 3) 1.2 3.0 Q
LX- On Resistance (Note 3) IO 2.2 Q
LX+ Leakage Current (Note 4) LX+ = +17V, V+ = 6V 100 pA
LX- Leakage Current (Note 4) LX- = -17V, V+ = 6V -1OO pA
Compensation Pin Impedance CCo, CC- 10 kn
Soft-Start Source Current ss = 0V 3.0 7.0 pA
Soft-Start Sink Current ss = 2V, V+ = 3.8V 0.5 2.0 mA
Note 1 l 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 passive component ratings.
Note 2: Total supply current including inductor current. The worst case for supply current occurs at low input voltage.
Note 3: Guaranteed by desi n, not 100% tested. Output currents are 100% tested.
Note 4: Tested at wafer Ieve only, not in packaged form,
2 MAXIM
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