n Wide Input Voltage Range: 5V to 80V
n Single Feedback Pin for Positive or Negative
n Internal 3.3A/84V Power Switch
n Current Mode Control Provides Excellent Transient
n Programmable Operating Frequency (100kHz to
1MHz) with One External Resistor
n Synchronizeable to an External Clock
n Low Shutdown Current < 1μA
n Internal 7.2V Low Dropout Voltage Regulator
n Programmable Input Undervoltage Lockout with
n Programmable Soft-Start
n Thermally Enhanced QFN (5mm × 6mm) Package
High Input Voltage,
Boost, Flyback, SEPIC and
The LT®3958 is a wide input range, current mode, DC/DC
converter which is capable of generating either positive
or negative output voltages. It can be conﬁgured as either
a boost, ﬂyback, SEPIC or inverting converter. It features
an internal low side N-channel power MOSFET rated for
84V at 3.3A and driven from an internal regulated 7.2V
supply. The ﬁxed frequency, current-mode architecture
results in stable operation over a wide range of supply
and output voltages.
The operating frequency of LT3958 can be set with an
external resistor over a 100kHz to 1MHz range, and can
be synchronized to an external clock using the SYNC pin.
A minimum operating supply voltage of 5V, and a low
shutdown quiescent current of less than 1μA, make the
LT3958 ideally suited for battery-powered systems.
The LT3958 features soft-start and frequency foldback
functions to limit inductor current during start-up.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
No RSENSE and ThinSOT are trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Patents pending.
12V TO 40V
High Efﬁciency Boost Converter
Efﬁciency vs Output Current
VIN = 24V
100 200 300 400 500
OUTPUT CURRENT (mA)