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MAX15004_10

Description
4.5V to 40V Input Automotive Flyback/Boost/SEPIC Power-Supply Controllers
File Size465KB,27 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
Download Datasheet Compare View All

MAX15004_10 Overview

4.5V to 40V Input Automotive Flyback/Boost/SEPIC Power-Supply Controllers

19-0723; Rev 2; 12/10
KIT
ATION
EVALU
BLE
AVAILA
4.5V to 40V Input Automotive
Flyback/Boost/SEPIC Power-Supply Controllers
General Description
The MAX15004A/B/MAX15005A/B high-performance,
current-mode PWM controllers operate at an automo-
tive input voltage range from 4.5V to 40V (load dump).
The input voltage can go down as low as 2.5V after
startup if V
CC
is supplied by an external bias voltage.
The controllers integrate all the building blocks neces-
sary for implementing fixed-frequency isolated/noniso-
lated power supplies. The general-purpose boost,
flyback, forward, and SEPIC converters can be
designed with ease around the MAX15004/MAX15005.
The current-mode control architecture offers excellent
line-transient response and cycle-by-cycle current limit
while simplifying the frequency compensation.
Programmable slope compensation simplifies the
design further. A fast 60ns current-limit response time,
low 300mV current-limit threshold makes the controllers
suitable for high-efficiency, high-frequency DC-DC con-
verters. The devices include an internal error amplifier
and 1% accurate reference to facilitate the primary-side
regulated, single-ended flyback converter or nonisolat-
ed converters.
An external resistor and capacitor network programs
the switching frequency from 15kHz to 500kHz (1MHz for
the MAX15005A/B). The MAX15004A/B/MAX15005A/B
provide a SYNC input for synchronization to an external
clock. The maximum FET-driver duty cycle for the
MAX15004A/B is 50%. The maximum duty cycle can be
set on the MAX15005A/B by selecting the right combi-
nation of RT and CT.
The input undervoltage lockout (ON/OFF) programs the
input-supply startup voltage and can be used to shut-
down the converter to reduce the total shutdown cur-
rent down to 10µA. Protection features include
cycle-by-cycle and hiccup current limit, output overvolt-
age protection, and thermal shutdown.
The MAX15004A/B/MAX15005A/B are available in
space-saving 16-pin TSSOP and thermally enhanced
16-pin TSSOP-EP packages. All devices operate over
the -40°C to +125°C automotive temperature range.
Features
o
Wide 4.5V to 40V Operating Input Voltage Range
o
Operates Down to 2.5V (with Bootstrapped V
CC
Bias)
o
Current-Mode Control
o
Low 300mV, 5% Accurate Current-Limit Threshold
Voltage
o
Internal Error Amplifier with 1% Accurate Reference
o
RC Programmable 4% Accurate Switching
Frequency
o
Switching Frequency Adjustable from 15kHz to
500kHz (1MHz for the MAX15005A/B)
o
External Frequency Synchronization
o
50% (MAX15004) or Adjustable (MAX15005)
Maximum Duty Cycle
o
Programmable Slope Compensation
o
10µA Shutdown Current
o
Cycle-by-Cycle and Hiccup Current-Limit
Protection
o
Overvoltage and Thermal Shutdown Protection
o
-40°C to +125°C Automotive Temperature Range
o
16-Pin TSSOP or 16-Pin Thermally Enhanced
TSSOP-EP Packages
o
AEC-Q100 Qualified
MAX15004/MAX15005
Ordering Information
PART
MAX15004AAUE+
MAX15004BAUE+
MAX15005AAUE+
MAX15005BAUE+
PIN-PACKAGE
16 TSSOP–EP*
16 TSSOP
16 TSSOP–EP*
16 TSSOP
MAX DUTY CYCLE
50%
50%
Programmable
Programmable
Applications
Automotive
Vacuum Fluorescent Display (VFD) Power
Supply
Isolated Flyback, Forward, Nonisolated SEPIC,
Boost Converters
MAX15005BAUE/V+
16 TSSOP
Programmable
Note:
All devices are specified over the -40°C to +125°C tem-
perature range.
+Denotes
lead (Pb)-free/RoHS-compliant package.
*EP
= Exposed pad.
/V = Automotive-qualified part.
Pin Configurations appear at end of data sheet.
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.

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