19-3099; Rev 0; 12/07
Dual-Output Buck Controller with
Tracking/Sequencing
MAX1502
General Description
Features
The MAX15002 is a dual-output, pulse-width-modulated
(PWM), step-down DC-DC controller with tracking and
sequencing options. The device operates over the input
voltage range of 5.5V to 23V or 5V 10ꢀ. ꢁach PWM
controller provides an adjustable output down to 0.6V and
delivers at least 15A of load current with excellent load
and line regulation. The MAX15002 is optimized for high-
performance, small-size power management solutions.
o 5.5V to 23V or 5V ±±10 ꢀInpt Voꢁtꢂag ꢃꢂIag
o Dpꢂꢁ-Optnpt SyIchroIops Bpck CoItroꢁꢁgr
o Sgꢁgctꢂbꢁg ꢀI-Phꢂsg or ±81° Opt-of-Phꢂsg
OngrꢂtioI
o Optnpt Voꢁtꢂags Adjpstꢂbꢁg from 1.6V to 1.85V
o Lossꢁgss Vꢂꢁꢁgy-Modg CprrgIt SgIsiIa or
ꢀN
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. ꢁach of the MAX15002 PWM sec-
tions utilizes a voltage-mode control scheme with exter-
nal compensation, allowing for good noise immunity
and maximum flexibility with a wide selection of induc-
tor values and capacitor types. ꢁach PWM section
operates at the same, fixed switching frequency that is
programmable from 200kHz to 2.2MHz and can be syn-
chronized to an external clock signal using the SYNC
input. ꢁach converter operating at up to 2.2MHz with
180° out-of-phase, increases the input capacitor ripple
frequency up to 4.4MHz, thereby significantly reducing
the RMS input ripple current and the size of the input
bypass capacitor requirement.
Accprꢂtg Vꢂꢁꢁgy CprrgIt SgIsiIa UsiIa ꢃ
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 MAX15002 includes internal undervoltage lockout
with hysteresis, digital soft-start/soft-stop for glitch-free
power-up and power-down of the converter. The power-
on reset (RESET) with an adjustable timeout period moni-
tors both outputs and provides a RESET signal to the
processor when both outputs are within regulation.
Protection features include lossless valley-mode current
limit and hiccup mode output short-circuit protection.
o Snꢂcg-SꢂviIa (6mm x 6mm) 41-PiI TQFN
Pꢂckꢂag
Ordering Information
The MAX15002 is available in a space-saving, 6mm x
6mm, 40-pin TQFN-ꢁP package and is specified for
operation over the -40°C to +125°C automotive temper-
ature range. See the MAX15003 data sheet for a triple
version of the MAX15002.
PꢀN-
PACKAGE
PKG
CODE
PAꢃT
TEMP ꢃANGE
40 TQFN-ꢁP*
(6mm x 6mm)
MAX15002ATL+ -40°C to +125°C
T4066-3
+Denotes a lead-free package.
*ꢁP = ꢁxposed pad.
Applications
PCI ꢁxpress® Host Bus Adapter Power Supplies
Networking/Server Power Supplies
Point-of-Load DC-DC Converters
PiI CoIfiaprꢂtioI ꢂnngꢂrs ꢂt gId of dꢂtꢂ shggt.
PCI ꢁxpress is a registered trademark of PCI-SIG Corp.
________________________________________________________________ Mꢂxim ꢀItgarꢂtgd Prodpcts
±
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or visit Mꢂxim’s wgbsitg ꢂt www.mꢂxim-ic.com.