19-1048; Rev 0; 10/07
Triple-Output Buck Controller with
The MAX15003 is a triple-output, pulse-width-modulat-
ed (PWM), step-down DC-DC controller with tracking
and sequencing capability. The device operates over
the input voltage range of 5.5V to 23V or 5V ±10%.
Each PWM controller provides an adjustable output
down to 0.6V and delivers up to 15A for each output
with excellent load and line regulation. The MAX15003
is optimized for high-performance, small-size power
The options of coincident tracking, ratiometric tracking,
and output sequencing allow the tailoring of the power-
up/power-down sequence depending on the system
requirements. Each of the MAX15003 PWM sections uti-
lizes a voltage-mode control scheme with external com-
pensation allowing for good noise immunity and
maximum flexibility with a wide selection of inductor val-
ues and capacitor types. Each PWM section operates
at the same, fixed switching frequency that is program-
mable from 200kHz to 2.2MHz and can be synchro-
nized to an external clock signal using the SYNC input.
Each converter operating at up to 2.2MHz with 120°
out-of-phase, increases the input capacitor ripple fre-
quency up to 6.6MHz, thereby reducing the RMS input
ripple current and the size of the input bypass capaci-
tor requirement significantly.
The MAX15003 includes internal input undervoltage
lockout with hysteresis, digital soft-start/soft-stop for
glitch-free power-up and power-down of each convert-
er. The power-on reset (RESET) with an adjustable
outputs and provides
when all outputs are
within regulation. Protection features include lossless
valley-mode current limit and hiccup mode output
The MAX15003 is available in a space-saving, 7mm x
7mm, 48-pin TQFN-EP package and is specified for
operation over the -40°C to +125°C automotive temper-
ature range. See the MAX15002 data sheet for a dual
version of the MAX15003.
PCI Express® Host Bus Adapter Power Supplies
Networking/Server Power Supplies
Point-of-Load DC-DC Converters
o 5.5V to 23V or 5V ±10% Input Voltage Range
o Triple-Output Synchronous Buck Controller
o Selectable In-Phase or 120° Out-of-Phase
o Output Voltages Adjustable from 0.6V to 0.85VIN
o Lossless Valley-Mode Current Sensing or
Accurate Valley Current Sensing Using RSENSE
o External Compensation for Maximum Flexibility
o Digital Soft-Start and Soft-Stop
o Sequencing or Coincident/Ratiometric VOUT
o Individual PGOOD Outputs
o RESET Output with a Programmable Timeout
o 200kHz to 2.2MHz Programmable Switching
o External Frequency Synchronization
o Hiccup Mode Short-Circuit Protection
o Space-Saving (7mm x 7mm) 48-Pin TQFN
-40°C to +125°C
(7mm x 7mm)
+Denotes a lead-free package.
*EP = Exposed pad.
Add a “T” after “+” for tape and reel. Tape-and-reel orders are
available in 2.5k increments.
Pin Configuration appears at end of data sheet.
PCI Express is a registered trademark of PCI-SIG Corp.
________________________________________________________________ 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.