OM1577 Series
STEP-UP SWITCHING VOLTAGE REGULATOR IN
HERMETIC ISOLATED PACKAGE
1 Amp, 12 V, 15 V And Adjustable Output
Voltage Versions In MO-078 Metal Package
FEATURES
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Similar To Industry Standard LM1577 Series
Available in 12V, 15V And Adjustable Output Voltage Versions
Hermetic Isolated Packages
Requires Few External Components
Protection Features Current And Thermal Limitations
Hi-Rel Screened
DESCRIPTION
These devices are monolithic integrated circuits that provide all of the power and control
functions for step-up (boost), flyback and converter switching regulators. They are simple to
use and cost effective as they only require a small number of external components for
implementation. The chip incorporates a 3.0 Amp NPN switch and associated protection
circuitry featuring current and thermal limitations and under voltage lockout.
ABSOLUTE MAXIMUM RATINGS (See note 1)
Input Voltage, VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 V
Output Switch Voltage, VSWITCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 V
Output Switch Current, ISWITCH (See note 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.0 A
Storage Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65°C to + 150°C
Junction Temperature, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +150°C
Lead Soldering Temperature, (10 seconds). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°C
Power Dissipation, PD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Internally Limited
Thermal Resistance:
Junction-to-Case, qJC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.0°C/W Typically
Junction-to-Ambient, qJA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65°C/W
3.3
RECOMMENDED OPERATING CONDITIONS
Input Voltage Range, VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5 to 40 V
Ambient Operating Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55°C to + 125°C
Output Switch Voltage Range, VSWITCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 60 V
Output Switch Current, ISWITCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.0 A
Notes:
1. Stresses above the absolute maximum rating may cause damage to the device. Extended operation
at the maximum levels may degrade performance and affect reliability.
2. Output current cannot be internally limited when the device is used as a step-up regulator. To
prevent damage to the switch, the current must be externally limited to 6.0 A. However, output
current is internally limited when the device is used as a flyback or forward converter regulator.
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