MAX5074 Maxim Integrated Products, MAX5074 Datasheet
MAX5074
Manufacturer Part Number
MAX5074
Description
Power IC with Integrated MOSFETs
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX5074.pdf
(13 pages)
The MAX5074 isolated PWM power IC features integrated
switching power MOSFETs connected in a voltage-
clamped, two-transistor, power-circuit configuration. This
device can be used in both forward and flyback configu-
rations with a wide input voltage range from 11V to 76V
and up to 15W of output power.
The voltage-clamped power topology enables full
recovery of stored magnetizing and leakage inductive
energy for enhanced efficiency and reliability. A look-
ahead signal for driving secondary-side synchronous
rectifiers can be used to increase efficiency.
A wide array of protection features includes UVLO,
overtemperature shutdown, and short-circuit protection
with hiccup current limit for enhanced performance and
reliability. Operation up to 500kHz allows smaller exter-
nal magnetics and capacitors.
The MAX5074 is rated for operation over the -40°C to
+125°C temperature range and is available in a 20-pin
TSSOP package.
Warning: The MAX5074 is designed to work with
high voltages. Exercise caution.
19-3312; Rev 0; 7/04
Power IC with Integrated MOSFETs for Isolated IEEE
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.
802.3af PD and Telecom Power-Supply Applications
IEEE 802.3af PD Power Supplies
Isolated IP Phone Power Supplies
High-Efficiency Telecom/Datacom Power Supplies
48V Input, Isolated Power-Supply Modules
WLAN Access-Point Power Supplies
ADSL Line Cards
ADSL Line-Driver Power Supplies
Distributed Power Systems with 48V Bus
TOP VIEW
REGOUT
FLTINT
PPWM
RAMP
OPTO
RTCT
RCFF
GND
CSS
CS
________________________________________________________________ Maxim Integrated Products
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7
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9
General Description
MAX5074
TSSOP
Pin Configuration
20
19
18
17
16
15
14
13
12
11
Applications
INBIAS
HVIN
UVLO
BST
DRNH
XFRMRH
DRVIN
XFRMRL
SRC
PGND
♦ Clamped, Two-Switch Power IC for High Efficiency
♦ No Reset Winding Required
♦ Up to 15W Output Power
♦ Bias Voltage Regulator with Automatic High-
♦ 11V to 76V Wide Input Voltage Range
♦ Integrated High-Voltage 0.4Ω Power MOSFETs
♦ Feed-Forward Voltage-Mode Control For Fast
♦ Programmable Brownout Undervoltage Lockout
♦ Internal Overtemperature Shutdown
♦ Indefinite Short-Circuit Protection With
♦ Integrated Look-Ahead Signal for Secondary-Side
♦ >90% Efficiency with Synchronous Rectification
♦ Up to 500kHz Switching Frequency
♦ High-Power (1.74W), Small-Footprint 20-Pin
*EP = Exposed pad.
MAX5074AUP
Voltage Supply Turn-Off
Input Transient Rejection
Programmable Fault Integration
Synchronous Rectification
Thermally Enhanced TSSOP Package
PART
Simplified Application Circuit
MAX5074
DRVH
DRVL
DRNH
SRC
XFRMRH
XFRMRL
-40°C to +125°C
Ordering Information
V
TEMP RANGE
IN
QH
QL
D1
D2
C
IN
T1
D3
PIN-PACKAGE
20-TSSOP-EP*
www.DataSheet4U.com
Features
C
OUT
V
OUT
1
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