1. General description
The NXF6505A/B-Q100 is a specialized push-pull
transformer driver that is designed for isolated power
supplies in small form factors. This driver is capable
of driving low-profile, center-tapped transformers from
a 2.25 V to 5.5 V DC power supply, while achieving
ultra-low noise and EMI using slew rate control and
Spread Spectrum Clocking (SSC).
The NXF6505A/B-Q100 features internal protection
features such as current limiting, undervoltage lockout,
thermal shutdown, and break-before-make circuitry,
ensuring the device operates within safe limits. The
device also includes a soft-start feature that prevents
high inrush current during power-up with large load.
The NXF6505A/B-Q100 is constructed using
an oscillator and a gate drive circuit that
produces complementary output signals to drive
ground-referenced N-channel power switches.
These two complementary 1.2 A Power-MOSFET
switches can be used to provide >6 W power. The
440 kHz internal oscillator is for applications that
require higher efficiency and smaller transformers.
The NXF6505A/B-Q100 is available in a small 6 pin
SOT8061-1 package and is characterized for operation
within a temperature range of -55 °C to 125 °C.
This product has been qualified to the Automotive
Electronics Council (AEC) standard Q100 (Grade 1)
and is suitable for use in automotive applications.

2. Features and benefits
• Automotive product qualification in accordance with
AEC-Q100 (Grade 1)
• Specified from -55 °C to +125 °C
• Push-pull driver for transformers, optimized for low
EMI:
• Slew-rate control output
• Spread Spectrum Clocking (SSC)
• Wide input voltage range: 2.25 V to 5.5 V
• High output drive: 1.2 A at 5 V supply
• Low RON 0.2 Ω maximum at 5 V supply
• Internal switching frequency:
• for NXF6505A-Q100: 160 kHz
• for NXF6505B-Q100: 440 kHz
• Synchronization of multiple devices with external
clock input
• 2.2 A current limit at 5 V
• Enable pin to put device in low shutdown current:
<1 μA
• Thermal shutdown protection
• Soft-start start-up
• Small 6 pin SOT8061-1 (SC-74; TSOP-6) package
• ESD protection:
• HBM: ANSI/ESDA/JEDEC JS-001 class 3A
exceeds 6000 V
• CDM: ANSI/ESDA/JEDEC JS-002 class C3
exceeds 1500 V

3. Applications
• Isolated power supply for automotive and industrial
applications including:
• CAN, RS-485, RS-422, RS-232, SPI, I²C,
low-power LAN
• Low-noise isolated USB supplies
• Process control
• Telecom supplies
• Radio supplies
• Distributed supplies
• Medical instruments
• Precision instruments
• Low-noise filament supplies
• Motor control