MAX15004_11 Datasheet, PDF (1/27 Pages) Maxim Integrated Products – 4.5V to 40V Input Automotive Flyback/Boost/SEPIC Power-Supply Controllers

19-0723; Rev 3; 1/11
EVAALVUAAILTAIOBNLEKIT
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.
Applications
Automotive
Vacuum Fluorescent Display (VFD) Power
Supply
Isolated Flyback, Forward, Nonisolated SEPIC,
Boost Converters
Pin Configurations appear at end of data sheet.
Features
♦ Wide 4.5V to 40V Operating Input Voltage Range
♦ Operates Down to 2.5V (with Bootstrapped V_CC
Bias)
♦ Current-Mode Control
♦ Low 300mV, 5% Accurate Current-Limit Threshold
Voltage
♦ Internal Error Amplifier with 1% Accurate Reference
♦ RC Programmable 4% Accurate Switching
Frequency
♦ Switching Frequency Adjustable from 15kHz to
500kHz (1MHz for the MAX15005A/B)
♦ External Frequency Synchronization
♦ 50% (MAX15004) or Adjustable (MAX15005)
Maximum Duty Cycle
♦ Programmable Slope Compensation
♦ 10µA Shutdown Current
♦ Cycle-by-Cycle and Hiccup Current-Limit
Protection
♦ Overvoltage and Thermal Shutdown Protection
♦ -40°C to +125°C Automotive Temperature Range
♦ 16-Pin TSSOP or 16-Pin Thermally Enhanced
TSSOP-EP Packages
♦ AEC-Q100 Qualified
Ordering Information
PART
PIN-PACKAGE MAX DUTY CYCLE
MAX15004AAUE+ 16 TSSOP-EP*
50%
MAX15004AAUE/V+ 16 TSSOP-EP*
50%
MAX15004BAUE+ 16 TSSOP
50%
MAX15004BAUE/V+ 16 TSSOP
50%
MAX15005AAUE+ 16 TSSOP-EP*
Programmable
MAX15005AAUE/V+ 16 TSSOP-EP*
Programmable
MAX15005BAUE+ 16 TSSOP
Programmable
MAX15005BAUE/V+ 16 TSSOP
Programmable
Note: All devices are specified over the -40°C to +125°C
temperature range.
+Denotes a lead(Pb)-free/RoHS-compliant package.
/V denotes an automotive qualified part.
*EP = Exposed pad.
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