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PDF MAX258 Data sheet ( Hoja de datos )
| Número de pieza | MAX258 | |
| Descripción | Push-Pull Transformer Driver | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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MAX258
EVALUATION KIT AVAILABLE
500mA, Push-Pull Transformer Driver
for Isolated Power Supplies
General Description
The MAX258 is a 500mA, push-pull transformer driver
designed to provide a simple solution for isolated power
supplies. The IC 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 isolated output
voltage with galvanic isolation.
The device features an integrated oscillator driving a pair
of n-channel power switches. Internal circuitry guarantees
a fixed 50% duty cycle to prevent DC current flow through
the transformer.
The IC operates with up to 500mA of continuous current
and features undervoltage lockout and thermal shutdown.
The IC includes a low-current shutdown mode to reduce
the overall supply current to less than 5µA (max) when the
driver is disabled.
The MAX258 is available in a small 8-pin (2mm x 3mm)
TDFN package and is specified over the -40°C to +125°C
temperature range.
Typical Operating Circuit
Features and Benefits
● Simple, Flexible Design
• +3.0V to +5.5V Supply Range
• Low RON 300mΩ (max) at 4.5V
• Up to 90% Efficiency
• Provides Up to 500mA to the Transformer
• 250kHz or 600kHz Internal Oscillator Frequency
• -40ºC to +125ºC Temperature Range
● Integrated System Protection
• Undervoltage Lockout
• Thermal Shutdown
● Saves Space on Board
• Small 8-Pin TDFN Package (2mm x 3mm)
Applications
● Power Meter Data Interface
● Isolated Fieldbus Interface
● Medical Equipment
● Isolated Analog Front-End
Ordering Information appears at end of data sheet.
5V
HICLK
1µF
VDD
T2
1CT:1.3CT
MAX258
EN
GND
T1
PGND
10µF
1µF
ISOLATED
VOUT
For related parts and recommended products to use with this part, refer to www.maximintegrated.com/MAX258.related.
19-6696; Rev 0; 5/13
1 page  
MAX258
500mA, Push-Pull Transformer Driver
for Isolated Power Supplies
Typical Operating Characteristics (continued)
(VDD = +5V, TA = +25°C, unless otherwise noted.)
EFFICIENCY vs. LOAD CURRENT
95
93 TA = +85°C
TA = +25°C
91
89
87
85 TA = +125°C
83 TA = -40°C
81 HICLK = GND
79 1:1:2:2
77
HALO TGM-H260V8LF
TRANSFORMER
75
0 0.05 0.10 0.15
0.20
LOAD CURRENT (A)
0.25
EFFICIENCY vs. LOAD CURRENT
95
93 VDD = 3.6V
91 VDD = 3.3V
89
87
85
83 VDD = 3.0V
81 HICLK = GND
79 1:1:2:2
77
HALO TGM-H260V8LF
TRANSFORMER
75
0 0.05 0.10 0.15
0.20
LOAD CURRENT (A)
0.25
EFFICIENCY vs. LOAD CURRENT
95
93 HICLK = GND
91
89
87
85 HICLK = VDD
83
81
79 1:1:2:2
77
HALO TGM-H260V8LF
TRANSFORMER
75
0 0.05 0.10 0.15
0.20
LOAD CURRENT (A)
0.25
SWITCHING WAVEFORMS
MAX258 toc11
T1
5V/div
0V
T2
5V/div
0V
HICLK = GND RLOAD = 1kΩ
1µs/div
www.maximintegrated.com
Maxim Integrated │ 5
5 Page 
MAX258
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX258ATA+
-40°C to +125°C
8 TDFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Chip Information
PROCESS: BiCMOS
500mA, Push-Pull Transformer Driver
for Isolated Power Supplies
Package Information
For the latest package outline information and land patterns
(footprints), go to www.maximintegrated.com/packages. Note
that a “+”, “#”, or “-” in the package code indicates RoHS status
only. Package drawings may show a different suffix character, but
the drawing pertains to the package regardless of RoHS status.
PACKAGE
TYPE
8 TDFN-EP
PACKAGE
CODE
T823+1
OUTLINE
NO.
21-0174
LAND
PATTERN NO.
90-0091
www.maximintegrated.com
Maxim Integrated │ 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MAX258.PDF ] | |
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