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MAX742CWPMAXIMN/a200avaiSwitch-Mode Regulator with +5V to 【12V or 【15V Dual Output
MAX742CWPMAXIM ?N/a3avaiSwitch-Mode Regulator with +5V to 【12V or 【15V Dual Output
MAX742CWPN/a23avaiSwitch-Mode Regulator with +5V to 【12V or 【15V Dual Output
MAX742CPPMAXIMN/a18avaiSwitch-Mode Regulator with +5V to 【12V or 【15V Dual Output
MAX742EPPMAXIMN/a1500avaiSwitch-Mode Regulator with +5V to 【12V or 【15V Dual Output
MAX742EWPMAXIMN/a5avaiSwitch-Mode Regulator with +5V to 【12V or 【15V Dual Output


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MAX742CPP-MAX742CWP-MAX742EPP-MAX742EWP
Switch-Mode Regulator with +5V to 【12V or 【15V Dual Output
_______________General Description
The MAX742 DC-DC converter is a controller for dual-out-
put power supplies in the 3W to 60W range. Relying on
simple two-terminal inductors rather than transformers, the
MAX742 regulates both outputs independently to within
±4% over all conditions of line voltage, temperature, and
load current.
The MAX742 has high efficiency (up to 92%) over a wide
range of output loading. Two independent PWM current-
mode feedback loops provide tight regulation and opera-
tion free from subharmonic noise. The MAX742 can
operate at 100kHz or 200kHz, so it can be used with small
and lightweight external components. Also ripple and
noise are easy to filter. The MAX742 provides a regulated
output for inputs ranging from 4.2V to 10V (and higher with
additional components).
External power MOSFETs driven directly from the MAX742
are protected by cycle-by-cycle overcurrent sensing. The
MAX742 also features undervoltage lockout, thermal shut-
down, and programmable soft-start.
If 3W of load power or less is needed, refer to the MAX743
data sheet for a device with internal power MOSFETs.
________________________Applications

DC-DC Converter Module Replacement
Distributed Power Systems
Computer Peripherals
____________________________Features
Specs Guaranteed for In-Circuit PerformanceLoad Currents to ±2A4.2V to 10V Input-Voltage RangeSwitches From ±15V to ±12V Under Logic Control±4% Output Tolerance Max Over Temp, Line,
and Load
90% Typ EfficiencyLow-Noise, Current-Mode FeedbackCycle-by-Cycle Current LimitingUndervoltage Lockout and Soft-Start100kHz or 200kHz Operation
MAX742
Switch-Mode Regulator with
+5V to ±12V or ±15V Dual Output
__________Simplified Block Diagram
__________________Pin Configuration

19-3105; Rev 2; 8/96
* Contact factory for dice specifications
MAX742
Switch-Mode Regulator with
+5V to ±12V or ±15V Dual Output
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS

(Circuit of Figure 2, +4.5V < V+ < +5.5V.)
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.
V+, AV+ to AGND, GND.........................................-0.3V to +12V
PDRV to V+.............................................................+0.3V to -14V
FB+, FB- to GND..................................................................±25V
Input Voltage to GND
(CC+, CC-, CSH+, CSL+, CSH-, CSL-,
SS, 100/200, 12/15)..................................-0.3V to (V+ + 0.3V)
Output Voltage to GND
(EXT+, PUMP)..........................................-0.3V to (V+ + 0.3V)
EXT- to PDRV................................................-0.3V to (V+ + 0.3V)
Continuous Power Dissipation (any package)
up to +70°C.....................................................................500mW
derate above +70°C by..........................................100mW/°C
Operating Temperature Ranges
MAX742C_ _.......................................................0°C to +70°C
MAX742E_ _....................................................-40°C to +85°C
MAX742MJP..................................................-55°C to +125°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10sec).............................+300°C
ELECTRICAL CHARACTERISTICS

(Circuit of Figure 2, V+ = 5V, 100/200= 12/15= 0V; TA= TMINto TMAX, unless otherwise noted.)
MAX742
Switch-Mode Regulator with
+5V to ±12V or ±15V Dual Output
Note 1:
Devices are 100% tested to these limits under 0mA to 100mA and to 125mA conditions using automatic test equipment.
The ability to drive loads up to 1A is guaranteed by the current-limit threshold, output swing, and the output current
source/sink tests. See Figures 2 and 3.
Note 2:
Actual load capability of the circuit of Figure 2 is ±200mA in ±15V mode and ±250mA in ±12V mode. Load regulation is
tested at lower limits due to test equipment limitations.
Note 3:
Guaranteed by design.
Note 4:
Measured at Point A, circuit of Figure 2, with PDRV disconnected.
ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 2, V+ = 5V, 100/200= 12/15= 0V; TA= TMINto TMAX, unless otherwise noted.)
MAX742
Switch-Mode Regulator with
+5V to ±12V or ±15V Dual Output
__________________________________________Typical Operating Characteristics

(Circuit of Figure 2, V+ = 5V, TA = +25°C, unless otherwise noted.)
UNDERVOLTAGE LOCKOUT HYSTERESIS

MAX742 -1
SUPPLY VOLTAGE (V)
QUIESCENT SUPPLY CURRENT (mA)2351
CHARGE-PUMP LOAD REGULATION
MAX742 -2
CHARGE-PUMP LOAD CURRENT (mA)
CHARGE-PUMP OUTPUT VOLTAGE (V)
-3.52375610891
PDRV CURRENT vs. CEXT-

MAX742 -3
CAPACITANCE AT EXT- (nF)
PDRV CURRENT (mA)231
50
EFFICIENCY vs. LOAD CURRENT,
22W CIRCUIT, ±15V MODE

MAX742 -4
LOAD CURRENT (mA)
EFFICIENCY (%)
±800±400±600±1000±200
PEAK INDUCTOR CURRENT vs.
LOAD CURRENT

MAX742 -7
LOAD CURRENT (mA)
PEAK INDUCTOR CURRENT (mA)
50
EFFICIENCY vs. LOAD CURRENT,
6W CIRCUIT, ±15V MODE

MAX742 -5
LOAD CURRENT (mA)
EFFICIENCY (%)
±200±100±150±250±50
50
EFFICIENCY vs. LOAD CURRENT,
6W CIRCUIT, ±12V MODE

MAX742 -6
LOAD CURRENT (mA)
EFFICIENCY (%)
±300±150±225±75
CURRENT-LIMIT THRESHOLD vs.
SOFT-START VOLTAGE

MAX742 -8
SOFT-START VOLTAGE (V)
CURRENT-LIMIT THRESHOLD (mV)
15012
MAX742
Switch-Mode Regulator with
+5V to ±12V or ±15V Dual Output
_____________________________Typical Operating Characteristics (continued)

(Circuit of Figure 2, ILOAD= 100mA, unless otherwise noted.)
MAX742
Switch-Mode Regulator with
+5V to ±12V or ±15V Dual Output
______________________________________________________________Pin Description
________________Operating Principle

Each current-mode controller consists of a summing
amplifier that adds three signals: the current waveform
from the power switch FET, an output-voltage error sig-
nal, and a ramp signal for AC compensation generated
by the oscillator. The output of the summing amplifier
resets a flip-flop, which in turn activates the power FET
driver stage (Figure 1).
Both external transistor switches are synchronized to
the oscillator and turn on simultaneously when the flip-
flop is set. The switches turn off individually when their
source currents reach a trip threshold determined by
the output-voltage error signal. This creates a duty-
cycle modulated pulse train at the oscillator frequency,
where the on time is proportional to both the output-
voltage error signal and the peak inductor current. Low
peak currents or high output-voltage error signals result
in a high duty cycle (up to 90% maximum).
AC stability is enhanced by the internal ramp signal
applied to the error amplifier. This scheme eliminates
regenerative “staircasing” of the inductor current, which
is otherwise a problem when in continuous current
mode with greater than 50% duty cycle.
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