19-0723; Rev 2; 12/10
4.5V to 40V Input Automotive
Flyback/Boost/SEPIC Power-Supply Controllers
4/MAX105
General Description
Features
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
o Wide 4.5V to 40V Operating Input Voltage Range
o Operates Down to 2.5V (with Bootstrapped VCC
Bias)
startup if V
is supplied by an external bias voltage.
CC
o Current-Mode Control
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.
o Low 300mV, 5% Accurate Current-Limit Threshold
Voltage
o Internal Error Amplifier with 1% Accurate Reference
o RC Programmable 4% Accurate Switching
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.
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
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.
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
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.
o AEC-Q100 Qualified
Ordering Information
PART
PIN-PACKAGE MAX DUTY CYCLE
MAX15004AAUE+
MAX15004BAUE+
MAX15005AAUE+
MAX15005BAUE+
MAX15005BAUE/V+
16 TSSOP–EP*
16 TSSOP
50%
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.
50%
16 TSSOP–EP*
16 TSSOP
Programmable
Programmable
Programmable
16 TSSOP
Applications
Note: All devices are specified over the -40°C to +125°C tem-
perature range.
Automotive
+Denotes lead (Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Vacuum Fluorescent Display (VFD) Power
Supply
/V = Automotive-qualified part.
Isolated Flyback, Forward, Nonisolated SEPIC,
Boost Converters
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.