19-1048; Rev 0; 10/07
Triple-Output Buck Controller with
Tracking/Sequencing
MAX1503
General Description
Features
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 10ꢀ.
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
management solutions.
o 5.5V to 23V or 5V ±±10 ꢀInpt Voꢁtꢂag ꢃꢂIag
o Trinꢁg-Optnpt SyIchroIops Bpck CoItroꢁꢁgr
o Sgꢁgctꢂbꢁg ꢀI-Phꢂsg or ±21° Opt-of-Phꢂsg
OngrꢂtioI
o Optnpt Voꢁtꢂags Adjpstꢂbꢁg from 1.6V to 1.85V
ꢀN
o Lossꢁgss Vꢂꢁꢁgy-Modg CprrgIt SgIsiIa or
Accprꢂtg Vꢂꢁꢁgy CprrgIt SgIsiIa UsiIa ꢃ
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.
SENSE
o ExtgrIꢂꢁ ComngIsꢂtioI for Mꢂximpm Fꢁgxibiꢁity
o Diaitꢂꢁ Soft-Stꢂrt ꢂId Soft-Ston
o SgqpgIciIa or CoiIcidgIt/ꢃꢂtiomgtric V
OUT
TrꢂckiIa
o ꢀIdividpꢂꢁ PGOOD Optnpts
o RESET Optnpt with ꢂ Proarꢂmmꢂbꢁg Timgopt
Pgriod
o 211kHz to 2.2MHz Proarꢂmmꢂbꢁg SwitchiIa
FrgqpgIcy
o ExtgrIꢂꢁ FrgqpgIcy SyIchroIizꢂtioI
o Hiccpn Modg Short-Circpit ProtgctioI
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
timeout period monitors all three outputs and provides
a RESET signal to the processor when all outputs are
within regulation. Protection features include lossless
valley-mode current limit and hiccup mode output
short-circuit protection.
o Snꢂcg-SꢂviIa (7mm x 7mm) 48-PiI TQFN
Pꢂckꢂag
Ordering Information
PꢀN-
PACKAGE
PKG
CODE
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.
PAꢃT
TEMP ꢃANGE
48 TQFN-EP*
(7mm x 7mm)
MAX15003ATM+ -40°C to +125°C
T4877-3
+Denotes a lead-free package.
*EP = Exposed pad.
Applications
PCI Express® Host Bus Adapter Power Supplies
Networking/Server Power Supplies
Add a “T” after “+” for tape and reel. Tape-and-reel orders are
available in 2.5k increments.
Point-of-Load DC-DC Converters
PiI CoIfiaprꢂtioI ꢂnngꢂrs ꢂt gId of dꢂtꢂ shggt.
PCI Express is a registered trademark of PCI-SIG Corp.
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±
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