MAX845ESA+ Maxim Integrated Products, MAX845ESA+ Datasheet

IC DRVR XFRMR CMOS PCMCIA 8SOIC

MAX845ESA+

Manufacturer Part Number
MAX845ESA+
Description
IC DRVR XFRMR CMOS PCMCIA 8SOIC
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX845ESA.pdf (16 pages)

Specifications of MAX845ESA+

Applications
Transformer Driver, PCMCIA
Voltage - Input
3.3V, 5V
Number Of Outputs
1
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Supply Current
1.1 mA
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
Output Current
200 mA
Output Voltage
12 V
Supply Voltage
5V
Digital Ic Case Style
SOIC
No. Of Pins
8
No. Of Regulated Outputs
2
Operating Temperature Range
-40°C To +85°C
Device Type
Transformer
Filter Terminals
SMD
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Voltage - Output
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
The MAX845 provides an isolated power supply small
enough to fit in thin PCMCIA cards and space-sensitive
applications. It drives a low-profile center-tapped trans-
former primary from a 5V or 3.3V DC power supply. The
secondary can be wound to provide any isolated posi-
tive or negative voltage at powers up to 750mW.
The MAX845 consists of an oscillator followed by a tog-
gle flip-flop. The flip-flop generates two 50% duty-cycle
square waves, which are complementary at half the
oscillator frequency (450kHz, min). These two signals
drive the ground-referenced N-channel power switch-
es. Internal circuitry ensures break-before-make action
between the two switches.
A low-power shutdown disables both the switches and
the oscillator, reducing power consumption. An evalua-
tion kit (MAX845EVKIT-MM) is available to evaluate low-
profile 5V 40mA and 5V 100mA applications.
________________________Applications
19-0372; Rev 4; 10/97
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
__________Typical Operating Circuit
_______________General Description
FREQUENCY
SELECT
PCMCIA Modem Cards
Isolated Data Acquisition
Isolated Interface Power Supply
Noise-Immunity Communications Interface
Bridging Ground Differences
Medical Equipment
Process Control
Low-Power LAN Networks
3
ON / OFF
FS
GND1
SD
MAX845
4
2
________________________________________________________________ Maxim Integrated Products
GND2
V
CC
6
7
D1
D2
V
1
8
IN
5V
T1
C1
CR1
CR2
5V @ 150mA
C3
C2
OUTPUT
Isolated Transformer Driver
for PCMCIA Applications
____________________________Features
___________________Pin Configuration
_______________Ordering Information
*Contact factory for dice specifications.
MAX845C/D
MAX845ESA
MAX845EUA
Transformer Driver for Ultra-Thin 5V-µs Transformers
Isolated DC-to-DC Power Supply for PCMCIA
Applications
450kHz Minimum Switching Frequency
Ultra-Low Input Supply Current Ripple
Single +5V or +3.3V Supply
5µW Low-Power Shutdown Mode
8-Pin SO and µMAX Packages
Low Output Ripple Permits Miniature Output
Capacitors
PART
TOP VIEW
GND1
SD
D1
FS
-40°C to +85°C
-40°C to +85°C
TEMP. RANGE
1
2
3
4
0°C to +70°C
SO/ MAX
MAX845
8
7
6
5
D2
GND2
V
N.C.
PIN-PACKAGE
Dice*
8 SO
8 µMAX
CC
1

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MAX845ESA+ Summary of contents

Page 1

... T1 FREQUENCY SELECT GND1 GND2 2 7 ________________________________________________________________ Maxim Integrated Products For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 408-737-7600 ext. 3468. Isolated Transformer Driver for PCMCIA Applications ____________________________Features Transformer Driver for Ultra-Thin 5V-µs Transformers Isolated DC-to-DC Power Supply for PCMCIA ...

Page 2

Isolated Transformer Driver for PCMCIA Applications ABSOLUTE MAXIMUM RATINGS Supply Voltage (V ) ...............................................-0.3V to +7V CC Control Input Voltage (SD, FS) ...................-0. Peak Output Switch Current (D1, D2) ......................................1A Output Switch Voltage (D1, D2) .............................................12V Average Output ...

Page 3

Operating Characteristics ( Typical Operating Circuit , 0.1µ 0.33µ Halo TGM-010P3, CR1 = CR2 = MBR0520 +25°C, unless otherwise noted.) A OUTPUT ...

Page 4

Isolated Transformer Driver for PCMCIA Applications ____________________________Typical Operating Characteristics (continued) ( Typical Operating Circuit , 0.1µ 0.33µ Halo TGM-010P3, CR1 = CR2 = MBR0520 ...

Page 5

MAX845 FS OSC FREQUENCY SELECT 400kHz/ 700kHz Figure 2. Detailed Block Diagram _______________Detailed Description The MAX845 is a transformer driver specifically designed to provide isolated power for PCMCIA and other height- and/or space-sensitive applications. It drives a ...

Page 6

Isolated Transformer Driver for PCMCIA Applications 0.1µ 1CT:1.3CT OFF MAX845 GND1 GND2 FREQUENCY SELECT 2 7 Figure Isolated 5V Application ...

Page 7

0.33µ GND1 2 Figure 5. Low-Noise Supply Isolated Data Conversion Almost any serial-interface device is a candidate for operation across an isolation barrier; Figure 6 illustrates one example. The MAX176 ...

Page 8

Isolated Transformer Driver for PCMCIA Applications 78L05 10µF ISO 5V ISO -12V 10µF MAX176 0.1µ ANALOG AIN CONVST INPUT 3 6 VREF CLOCK 4 5 0.1µF GND DATA 10µF 0.1µF 10µF SIGNAL ...

Page 9

TELEPHONE SUBSCRIBER LINE 6. 100k 2N3906 100k 2M 100k 680k 100k Figure 7. 5V from Telephone-Subscriber Line MAX845 GND1 GND2 0.1V to ...

Page 10

Isolated Transformer Driver for PCMCIA Applications 0.1µ MAX845 ON / OFF GND1 GND2 74HC04 390 DI * 74HC04 390 DE 3.3k * 74HC04 RO * ...

Page 11

0.1µF 5 N.C. MAX845 OFF SD GND1 GND2 2 *74HC04 390 T1 IN 74HC04 390 T2 IN 74HC04 390 T3 IN 74HC04 390 T4 IN 74HC04 390 3.3k 74HC04 ...

Page 12

Isolated Transformer Driver for PCMCIA Applications ______________Component Selection The MAX845 drives any transformer that has a center- tapped primary and a saturation rating of at least 5V-µs (ET product) per side. The oscillator frequency varies linearly with V . The ...

Page 13

Use a test winding to measure ET product (if using an ungapped toroid) and/ Determine the number of turns required for the pri- mary winding. For an ungapped toroid, ET product from center-tap to D1 must ...

Page 14

Isolated Transformer Driver for PCMCIA Applications R S SIMPLE SHUNT ZENER R S 22k TL431 22k PROGRAMMABLE-IC SHUNT REGULATOR (STAND ALONE 22k TL431 22k PROGRAMMABLE-IC SHUNT REGULATOR WITH DISCRETE PNP Figure 12. Shunt-Regulator Circuits Output Regulator Since ...

Page 15

Table 2. Rectifier Topology Trade-Offs TOPOLOGY ADVANTAGE • Only 3 external 2-Diode components Push/Pull • Low output ripple (Figure 11a) • Single diode drop • Simpler transformer 4-Diode winding requirements Bridge (Figure 11b) • Low output ripple Voltage • Fewest ...

Page 16

Isolated Transformer Driver for PCMCIA Applications ________________________________________________________Package Information 16 ______________________________________________________________________________________ ...

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