DC/DC Converter
adjustable, wide input range
pfm controller
features
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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
910.24/25/26
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.
applications
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Minimum component DC-DC converters
14V, 28V or 42V automotive systems
Power conditioning for portable equipment
High efficiency on-card switching regulators
block diagram
VBAT
VS
VSM
int. Supply &
References
On/Off
Logic
Gain
Control (1)
Overload
Protection (2)
VSM
VOut
ON
MDRV
DRV
ISEN
AGND
PFM
Circuit
Instr.
Ampl.
+
-
VFB
PGND
16
| ELMOS Product catalog 10/2004
ELMOS [ ELMOS SEMICONDUCTOR AG ]
