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MAX845ESA

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
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.
_______________General Description
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
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
____________________________Features
♦ 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
MAX845
Isolated Transformer Driver
for PCMCIA Applications
________________________________________________________________
Maxim Integrated Products
1
1
2
3
4
8
7
6
5
D2
GND2
V
CC
N.C.
SD
FS
GND1
D1
SO/µMAX
TOP VIEW
MAX845
___________________Pin Configuration
MAX845
D1
D2FS
GND1 GND2
V
CC
1
8
46
27
3
V
IN
SD
FREQUENCY
SELECT
C2
C1
C3
5V @ 150mA
OUTPUT
5V
ON / OFF
T1
CR2
CR1
__________Typical Operating Circuit
19-0372; Rev 4; 10/97
PART
MAX845C/D
MAX845EUA -40°C to +85°C
0°C to +70°C
TEMP. RANGE PIN-PACKAGE
Dice*
8 µMAX
EVALUATION KIT
AVAILABLE
*Contact factory for dice specifications.
_______________Ordering Information
MAX845ESA -40°C to +85°C 8 SO
MAX845
Isolated Transformer Driver
for PCMCIA Applications
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= 5V ±10%, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Note 1: Operating supply current is the current used by the MAX845 only. Load current is not included.
Note 2: Shutdown supply current includes output switch leakage currents.
Supply Voltage (V
CC
)...............................................-0.3V to +7V
Control Input Voltage (SD, FS)...................-0.3V to (V
CC
+ 0.3V)
Peak Output Switch Current (D1, D2)......................................1A
Output Switch Voltage (D1, D2).............................................12V
Average Output Switch Current (D1, D2) .........................200mA
Continuous Power Dissipation (T
A
= +70°C)
SO (derate 5.88mW/°C above +70°C).........................471mW
µMAX (derate 4.10mW/°C above +70°C) ....................330mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range.............................-65°C to +160°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10sec).............................+300°C
FS = V
CC
= 5.5V
FS = V
CC
= 4.5V
D1, D2; 100mA
Low
FS = V
CC
FS = 0V
High
SD = V
CC
FS = 0V, V
CC
= 4.5V
FS = 0V, V
CC
= 5.5V
Low
No load, SD = 0V, FS = V
CC
High
CONDITIONS
V2.5 2.2
µA
10
FS Input Current
50
V
0.8
FS Input Threshold
2.4
550 860 1100
450 675 900
Ω1.5 4.0Switch On-Resistance
pA10Shutdown Input Leakage Current
V
0.8
Shutdown Input Threshold
2.4
µA0.4Shutdown Supply Current (Note 2)
500
kHz
575
Switch Frequency
mA1.1 5.0Operating Supply Current (Note 1)
UNITSMIN TYP MAXPARAMETER
Minimum Start-Up Voltage
MAX845
Isolated Transformer Driver
for PCMCIA Applications
_______________________________________________________________________________________
3
40
-20 60
OUTPUT RESISTANCE vs. TEMPERATURE
30
MAX845-01
TEMPERATURE (°C)
OUTPUT RESISTANCE (Ω)
20 100
20
15
10
35
25
-40 0 8040
V
IN
= 4.5V
V
IN
= 5.5V
FIGURE 11c
7.5
2.5
-20 60
OUTPUT RESISTANCE vs. TEMPERATURE
3.5
6.0
MAX845-02
TEMPERATURE (°C)
OUTPUT RESISTANCE (Ω)
20 100
5.0
4.5
3.0
4.0
7.0
6.5
5.5
-40 0 8040
FIGURE 11b
1.6
1.4
1.2
0.2
-20 60
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
MAX845-03
TEMPERATURE (°C)
SHUTDOWN CURRENT (µA)
20 100
0.6
1.0
-40 0 8040
0.8
0.4
SD = V
CC
1000
950
600
-20 60
D1, D2 FREQUENCY vs. TEMPERATURE
MAX845-04
TEMPERATURE (°C)
FREQUENCY (kHz)
20 100
750
900
850
-40 0 8040
800
700
650
V
IN
= 5.5V
V
IN
= 4.5V
V
IN
= 5.0V
V
IN
= 6.0V
90
100
0
60
140 160
EFFICIENCY vs. LOAD CURRENT
20
70
MAX845-07
LOAD CURRENT (mA)
EFFICIENCY (%)
20 100
50
40
10
30
80
60
0
8040
120
FIGURE 11b
FIGURE 11c
850
800
500
550
-20 60
D1, D2 FREQUENCY vs. TEMPERATURE
MAX845-05
TEMPERATURE (°C)
FREQUENCY (kHz)
20 100
650
750
-40
0 8040
700
600
FS HIGH
V
IN
= 5.0V
FS LOW
1.5
1.4
0.8
-20 60
SUPPLY CURRENT vs. TEMPERATURE
MAX845-06
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
20 100
1.0
-40 0 8040
0.9
1.1
1.3
1.2
1.7
1.6
V
IN
= 4.5V
V
IN
= 5.0V
V
IN
= 5.5V
V
IN
= 6.0V
7.5
2.5
0 40
OUTPUT VOLTAGE vs. LOAD CURRENT
3.5
6.5
MAX845-08
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
80
5.5
4.5
3.0
4.0
7.0
6.0
5.0
20 60 140120100 160
TRANSFORMERS
USED IN FIGURE 11b
TGM-010P3
TGM-030P3
TGM-020P3
15
5
0 40
OUTPUT VOLTAGE vs. LOAD CURRENT
7
13
MAX845-09
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
80
11
9
6
8
14
12
10
20 60 140120100 160
TRANSFORMERS
USED IN FIGURE 11c
TGM-010P3
TGM-030P3
TGM-020P3
__________________________________________Typical Operating Characteristics
(
Typical Operating Circuit
, V
IN
= 5V, C1 = 0.1µF, C2 = C3 = 0.33µF, T1 = Halo TGM-010P3, CR1 = CR2 = MBR0520, FS = V
CC
,
T
A
= +25°C, unless otherwise noted.)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

MAX845ESA

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Manufacturer:
Maxim Integrated
Description:
Gate Drivers
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