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MAX5075BAUA-T

P1-P3P4-P6P7-P8
General Description
The MAX5075 is a +4.5V to +15V push-pull, current-fed
topology driver subsystem with an integrated oscillator
for use in telecom module power supplies. The device
drives two MOSFETs connected to a center-tapped
transformer primary providing secondary-side, isolated,
negative or positive voltages. This device features a pro-
grammable, accurate, integrated oscillator with a syn-
chronizing clock output that synchronizes an external
PWM regulator. A single external resistor programs the
internal oscillator frequency from 50kHz to 1.5MHz.
The MAX5075 incorporates a dual MOSFET driver with
±3A peak drive currents and 50% duty cycle. The
MOSFET driver generates complementary signals to
drive external ground-referenced n-channel MOSFETs.
The MAX5075 is available with a clock output frequency
to MOSFET driver frequency ratio of 1x, 2x, and 4x. The
MAX5075 is available in a thermally enhanced 8-pin
µMAX
®
package and is specified over the -40°C to
+125°C operating temperature range.
Applications
Current-Fed, High-Efficiency Power-Supply Modules
Power-Supply Building Subsystems
Push-Pull Driver Subsystems
Features
♦ Current-Fed, Push-Pull Driver Subsystem
♦ Programmable, Accurate Internal Oscillator
♦ Single +4.5V to +15V Supply Voltage Range
♦ Dual ±3A Gate-Drive Outputs
♦ 1mA Operating Current at 250kHz with No
Capacitive Load
♦ Synchronizing Clock Frequency Generation
Options
♦ Thermally Enhanced 8-Pin µMAX Package
♦ -40°C to +125°C Operating Temperature Range
MAX5075
Push-Pull FET Driver with Integrated Oscillator
and Clock Output
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
19-3662; Rev 1; 5/07
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Pin Configuration appears at end of data sheet.
PART
PIN-
PACKAGE
TOP
MARK
PKG
CODE
f
CLK
/f
NDRV_
RATIO
MAX5075AAUA
8 µMAX-EP* AAAU U8E-2
1
MAX5075BAUA
8 µMAX-EP* AAAV U8E-2
2
MAX5075CAUA
8 µMAX-EP* AAAW U8E-2
4
*EP = Exposed paddle.
Note: All devices specified for -40°C to +125°C operating
temperature range.
MAX5075
1nF
4.7kΩ
NDRV2
DRVH
DRVL
GND
GND
V
IN
V
IN
PWM
CONTROLLER
SYNCIN
NDRV1
V
CC
RT
PGNDI.C.
CLK
V
CC
V
OUT
Typical Operating Circuit
µMAX is a registered trademark of Maxim Integrated Products, Inc.
MAX5075
Push-Pull FET Driver with Integrated Oscillator
and Clock Output
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= +12V, R
RT
= 124kΩ, NDRV1 = NDRV2 = open, T
A
= T
J
= -40°C to +125°C, unless otherwise noted. Typical values are measured
at T
A
= +25°C.) (Note 1)
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.
V
CC
to DGND, PGND .............................................-0.3V to +18V
CLK, RT to DGND.....................................................-0.3V to +6V
NDRV1, NDRV2 to PGND...........................-0.3V to (V
CC
+ 0.3V)
DGND to PGND.....................................................-0.3V to +0.3V
CLK Current......................................................................±20mA
NDRV1, NDRV2 Peak Current (200ns) ..................................±5A
NDRV1, NDRV2 Reverse Current (Latchup Current)......±500mA
Continuous Power Dissipation (T
A
= +70°C)
8-Pin µMAX (derate 10.3mW/°C above +70°C) ...........825mW
Operating Temperature Range .........................-40°C to +125°C
Maximum Junction Temperature .....................................+150°C
Storage Temperature Range .............................-60°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
SUPPLY
Input Voltage Supply Range V
CC
4.5
15.0
V
Switching Supply Current I
CCSW
f
OSC
= 250kHz 1 3 mA
Undervoltage Lockout V
UVLO
V
CC
rising 3 3.5 4 V
UVLO Hysteresis
300
mV
OSCILLATOR
Frequency Range f
OSC
(Note 2) 50
1500
kHz
Accuracy f
OSC
= 250kHz , 6V ≤ V
CC
≤ 15V (Note 3) -8 +10 %
Oscillator Jitter
±0.6
%
7V ≤ V
CC
≤ 15V 3.9 5.0
CLK Output High Voltage I
CLK
= 1mA
4.5V ≤ V
CC
≤ 7V
3.35
5.0
V
CLK Output Low Voltage I
CLK
= -1mA 50 mV
CLK Output Rise Time C
CLK
= 30pF 35 ns
CLK Output Fall Time C
CLK
= 30pF 10 ns
GATE DRIVERS (NDRV1, NDRV2)
Output High Voltage V
OH
I
NDRV1
= I
NDRV2
= 100mA
V
CC
-
0.3
V
Output Low Voltage V
OL
I
NDRV1
= I
NDRV2
= -100mA 0.3 V
Output Peak Current I
P
Sourcing and sinking 3 A
NDRV_ sourcing 100mA 1.8 3
Driver Output Impedance
NDRV_ sinking 100mA 1.6 2.6
Ω
Latchup Current Protection Reverse current at NDRV1/NDRV2
400
mA
Rise Time t
R
C
LOAD
= 2nF 10 ns
Fall Time t
F
C
LOAD
= 2nF 10 ns
Note 1: The MAX5075 is 100% tested at T
A
= T
J
= +125°C. All limits over temperature are guaranteed by design.
Note 2: Use the following formula to calculate the MAX5075 oscillator frequency: f
OSC
= 10
12
/(32 x R
RT
).
Note 3: The accuracy of the oscillator’s frequency is lower at frequencies greater than 1MHz.
MAX5075
Push-Pull FET Driver with Integrated Oscillator
and Clock Output
_______________________________________________________________________________________ 3
Typical Operating Characteristics
(V
CC
= +12V, R
RT
= 124kΩ, NDRV_ = open, CLK = open.)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX5075 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
141312111098765
1
2
3
4
5
6
7
0
415
f
OSC
= 1.25MHz
f
OSC
= 500kHz
f
OSC
= 250kHz
f
OSC
= 100kHz
f
OSC
= 50kHz
SUPPLY CURRENT
vs. C
CLK
MAX5075 toc02
C
CLK
(pF)
SUPPLY CURRENT (mA)
80604020
1.05
1.10
1.15
1.20
1.25
1.30
1.35
1.40
1.45
1.50
1.00
0100
R
RT
= 124k
Ω
TEMPERATURE (
°
C)
1007525 500-25-50 125
SUPPLY CURRENT
vs. TEMPERATURE
MAX5075 toc03
SUPPLY CURRENT (mA)
1.02
1.04
1.06
1.08
1.10
1.12
1.14
1.16
1.18
1.20
1.00
f
OSC
= 250kHz
CLK RISE TIME
vs. SUPPLY VOLTAGE
MAX5075 toc04
SUPPLY VOLTAGE (V)
CLK RISE TIME (ns)
141311 126 7 8 9 105
5
10
15
20
25
30
35
40
45
50
0
415
C
CLK
= 30pF
CLK RISE TIME
vs. TEMPERATURE
MAX5075 toc05
TEMPERATURE (
°
C)
CLK RISE TIME (ns)
1007550250-25
37.0
37.5
38.0
38.5
39.0
39.5
36.5
-50 125
C
CLK
= 30pF
2
4
6
8
10
12
14
0
CLK FALL TIME
vs. SUPPLY VOLTAGE
MAX5075 toc06
SUPPLY VOLTAGE (V)
CLK FALL TIME (ns)
141311 126789105415
C
CLK
= 30pF
CLK FALL TIME
vs. TEMPERATURE
MAX5075 toc07
TEMPERATURE (°C)
CLK FALL TIME (ns)
1007550250-25
2
4
6
8
10
12
0
-50 125
C
CLK
= 30pF
OSCILLATOR FREQUENCY (kHz)
244
246
248
250
252
254
256
242
OSCILLATOR FREQUENCY
vs. SUPPLY VOLTAGE
MAX5075 toc08
SUPPLY VOLTAGE (V)
141311 126789105415
R
RT
= 124k
Ω
T
A
= -40
°
C
T
A
= +25
°
C
T
A
= +125
°
C
P1-P3P4-P6P7-P8

MAX5075BAUA-T

Mfr. #:
Buy MAX5075BAUA-T
Manufacturer:
Maxim Integrated
Description:
IC DRIVER FET P-P 8-UMAX
Lifecycle:
New from this manufacturer.
Delivery:
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