MAX13253 Datasheet, PDF (1/14 Pages) Maxim Integrated Products – 1A, Spread-Spectrum, Push-Pull, Transformer Driver for Isolated Power Supplies

MAX13253
EVALUATION KIT AVAILABLE
1A, Spread-Spectrum, Push-Pull, Transformer
Driver for Isolated Power Supplies
General Description
The MAX13253 is a 1A, push-pull, transformer driver
designed to provide a simple solution for low-EMI isolated
power supplies. The MAX13253 has an internal oscillator
and operates from a single +3.0V to +5.5V supply. The
transformer’s secondary-to-primary winding ratio defines
the output voltage, allowing selection of virtually any iso-
lated output voltage with galvanic isolation.
The MAX13253 features an integrated oscillator driving
a pair of n-channel power switches. The driver includes
pin-selectable spread-spectrum oscillation and a well-
controlled slew rate to reduce EMI. The MAX13253 can
optionally be driven by an external clock to further man-
age EMI. Internal circuitry guarantees a fixed 50% duty
cycle to prevent DC current flow through the transformer,
regardless of which clock source is used.
The MAX13253 operates with up to 1A of continuous
current and features integrated protection including fault
detection, overcurrent protection, and thermal shutdown.
The MAX13253 includes a low-current shutdown mode to
reduce the overall supply current to less than 5µA (max)
when the driver is disabled.
The MAX13253 is available in a small 10-pin (3mm x
3mm) TDFN package and is specified over the -40°C to
+125°C temperature range.
Typical Operating Circuit
5V
HICLK
SPRD
FAULT
1µF
VDD
T2
MAX13253
EN
CLK
GND
T1
PGND
Features and Benefits
● Simple, Flexible Design
• +3.0V to +5.5V Supply Range
• Low R_ON 300mΩ (max) at 4.5V
• Up to 90% Efficiency
• Provides Up to 1A to the Transformer
• Internal or External Clock Source
• Internal Oscillator Frequency: 250kHz or 600kHz
• Optional Spread-Spectrum Oscillation
• -40ºC to +125ºC Temperature Range
● Integrated System Protection
• Fault Detection and Indication
• Overcurrent Limiting
• Undervoltage Lockout
• Thermal Shutdown
● Saves Space on Board
• Small 10-Pin TDFN Package (3mm x 3mm)
Applications
● Power Meter Data Interface
● Isolated Fieldbus Interface
● Medical Equipment
● Isolated Analog Front-End
● Isolated USB Power
Ordering Information appears at end of data sheet.
1CT:1.3CT
10µF
1µF
ISOLATED
VOUT
For related parts and recommended products to use with this part, refer to www.maximintegrated.com/MAX13253.related.
19-6600; Rev 1; 4/13