Product Summary

The MAX253ESA monolithic oscillator/power-driver is specifically designed to provide isolated power for an isolated RS-485 or RS-232 data interface. The device drives a center-tapped transformer primary from a 5V or 3.3V DC power supply. The secondary can be wound to provide any isolated voltage needed at power levels up to 1W. The MAX253ESA consists of a CMOS oscillator driving a pair of N-channel power switches. The oscillator runs at double the output frequency, driving a toggle flip-flop to ensure 50% duty cycle to each of the switches.

Parametrics

MAX253ESA absolute maximum ratings: (1)Supply Voltage (VCC): -0.3V to +7V; (2)Control Input Voltages (SD, FS): -0.3V to (VCC + 0.3V); (3)Output Switch Voltage (D1, D2): 12V; (4)Peak Output Switch Current (D1, D2): 1A; (5)Average Output Switch Current (D1, D2): 200mA; (6)Continuous Power Dissipation (TA = +70℃): Plastic DIP (derate 9.09mW/℃ above +70℃): 727mW; SO (derate 5.88mW/℃ above +70℃): 471mW; μMAX (derate 4.10mW/℃ above +70℃): 330mW; CERDIP (derate 8.00mW/℃ above +70℃): 640mW; (7)Operating Temperature Ranges: -40℃ to +85℃; (8)Junction Temperatures: +150℃; (9)Storage Temperature Range: -65℃ to +160℃; (10)Lead Temperature (soldering, 10s): +300℃; (11)Soldering Temperature (reflow): PDIP, SO, μMAX lead(Pb)-free: +260℃; PDIP, SO, μMAX, CERDIP containing lead(Pb): +240℃.

Features

MAX253ESA features: (1)Power-Supply Transformer Driver for Isolated RS-485/RS-232 Data-Interface Applications; (2)Single 5V or 3.3V Supply; (3)Low-Current Shutdown Mode: 0.4μA; (4)Pin-Selectable Frequency: 350kHz or 200kHz; (5)8-Pin DIP, SO, and μMAX Packages.

Diagrams

MAX253ESA block diagram

Image Part No Mfg Description Data Sheet Download Pricing
(USD)
Quantity
MAX253ESA
MAX253ESA

Maxim Integrated Products

Power Driver ICs

Data Sheet

Negotiable 
MAX253ESA/V+
MAX253ESA/V+

Maxim Integrated Products

Power Driver ICs 1W Primary-Side Transformer H-Bridge Driver for Isolated Supplies

Data Sheet

Negotiable 
MAX253ESA/V+T
MAX253ESA/V+T

Maxim Integrated Products

Power Driver ICs 1W Primary-Side Transformer H-Bridge Driver for Isolated Supplies

Data Sheet

Negotiable 
MAX253ESA+
MAX253ESA+

Maxim Integrated Products

Power Driver ICs Transformer Driver for Iso RS-485 Int

Data Sheet

0-1: $2.54
1-25: $1.70
25-50: $1.24
50-100: $1.22
MAX253ESA+T
MAX253ESA+T

Maxim Integrated Products

Power Driver ICs Transformer Driver for Iso RS-485 Int

Data Sheet

0-2010: $1.12
2010-2500: $1.12
MAX253ESA-T
MAX253ESA-T

Maxim Integrated Products

Power Driver ICs

Data Sheet

Negotiable