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910.24 Datasheet, PDF (1/2 Pages) ELMOS Semiconductor AG – DC/DC Converter adjustable, wide input range pfm controller
DC/DC Converter
adjustable, wide input range
pfm controller
910.24/25/26
features
• Supply voltage range VS 3.0V to 60V
• Up to 90% efficiency
• 40µA standby current
• 180µA circuit operating current
• 1.5V to 24V or more adjustable output voltage
• Up to 300kHz switching frequency
• Improved current-limited PFM control scheme
• High current driver for external MOSFET
• Under-voltage lockout and thermal shutdown
• -40°C to 125°C operating temperature
• SO8 package
• 910.26 basis version
• 910.24 additive with peak current halving for
medium loads and extended max. switch-on-time
• 910.25 additive with peak current halving for
medium loads and extended max. switch-on-time
and fault protection
applications
• Minimum component DC-DC converters
• 14V, 28V or 42V automotive systems
• Power conditioning for portable equipment
• High efficiency on-card switching regulators
description
The family of highly flexible, easy to use PFM controllers is ideal for
the use in wide input range switching regulator applications.
An advanced PFM control scheme gives these devices the benefits of
PWM converters with high efficiency for heavy loads, while using very
low operating current for light loads to maintain excellent behaviour
with output load variation.
The switching circuits are suitable for topologies requiring low side
FET, such as boost, flyback, Sepic, etc. Depending on the utilized
topology the controllers are capable of producing regulated positive
or negative output voltage.
Operating from 3V to 60V supply and in temperature ranges from
-40°C to 125°C the device is well suited for automotive applications.
Requiring a minimum number of external components, these regula-
tors are simple to use and cost-saving.
Self-protection features include an overload detection circuit, an
overtemperature shutdown under fault conditions and an under-volt-
age lockout.
block diagram
VBAT
VS
VSM
VSM int. Supply &
VOut
References
ON
On/Off
Logic
Gain
Control (1)
PFM
Circuit
DRV
+
Instr.
Ampl.
-
MDRV
ISEN
AGND
Overload
VFB
Protection (2)
PGND
16 | ELMOS Product catalog 10/2004