19-4108; Rev 4; 2/12
Low-Cost, Small, 4.5V to 28V Wide Operating
Range, DC-DC Synchronous Buck Controller
MAX15026
General Description
Features
o 4.5V to 28V or 5V ±±10 ꢀInpt ꢁpnnꢂl ꢃRIꢄg
The MAX15026 synchronous step-down controller oper-
ates from a 4.5V to 28V input voltage range and gener-
ates an adjustable output voltage from 85% of the input
voltage down to 0.6V while supporting loads up to 25A.
The device allows monotonic startup into a prebiased
bus without discharging the output and features adap-
tive internal digital soft-start.
o 1.6V to (1.85 x V ) AdjpstRbꢂg Optnpt
o AdjpstRbꢂg 211kHz to 2MHz ꢁwitchiIꢄ FrgqpgIcl
o Abiꢂitl to ꢁtRrt iIto R PrgbiRsgd LoRd
o Lossꢂgss, Clcꢂg-bl-Clcꢂg VRꢂꢂgl Modg CprrgIt
Limit with AdjpstRbꢂg, TgmngrRtprg-ComngIsRtgd
Thrgshoꢂd
ꢀN
o ꢁiIk-Modg CprrgIt-Limit ProtgctioI
o AdRntivg ꢀItgrIRꢂ DiꢄitRꢂ ꢁoft-ꢁtRrt
o ±±0 AccprRtg VoꢂtRꢄg ꢃgfgrgIcg
o ꢀItgrIRꢂ Boost Diodg
The MAX15026 offers the ability to adjust the switching
frequency from 200kHz to 2MHz with an external resis-
tor. The MAX15026’s adaptive synchronous rectification
eliminates the need for an external freewheeling
Schottky diode. The device also utilizes the external
low-side MOSFET’s on-resistance as a current-sense
element, eliminating the need for a current-sense resis-
tor. This protects the DC-DC components from damage
during output overloaded conditions or output short-
circuit faults without requiring a current-sense resistor.
Hiccup-mode current limit reduces power dissipation
during short-circuit conditions. The MAX15026 includes
a power-good output and an enable input with precise
turn-on/turn-off threshold, which can be used for input
supply monitoring and for power sequencing.
o AdRntivg ꢁlIchroIops ꢃgctificRtioI EꢂimiIRtgs
ExtgrIRꢂ FrggwhggꢂiIꢄ ꢁchottkl Diodg
o Hiccpn-Modg ꢁhort-Circpit ProtgctioI
o ThgrmRꢂ ꢁhptdowI
o Powgr-Good Optnpt RId EIRbꢂg ꢀInpt for Powgr
ꢁgqpgIciIꢄ
o ±50 AccprRtg EIRbꢂg ꢀInpt Thrgshoꢂd
o AEC-Q±11 QpRꢂifigd (MAX±5126B)
Ordering Information
PART
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
14 TDFN-EP*
14 TDFN-EP*
14 TDFN-EP*
14 TDFN-EP*
14 TDFN-EP*
14 TDFN-EP*
Additional protection features include sink-mode cur-
rent limit and thermal shutdown.
MAX15026BETD+
MAX15026BETD/V+T
MAX15026CETD+
MAX15026BATD+
MAX15026CATD+
MAX15026DATD+
Sink-mode current limit prevents reverse inductor cur-
rent from reaching dangerous levels when the device is
sinking current from the output.
The MAX15026 is available in a space-saving and ther-
mally enhanced 3mm x 3mm, 14-pin TDFN-EP pack-
age. The MAX15026 operates over the extended -40°C
to +85°C and automotive -40°C to +125°C temperature
ranges.
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad. T = Tape and reel.
/V denotes an automotive qualified part.
MAX15026C recommended for new designs.
The MAX15026C is designed to provide additional mar-
gin for break-before-make times.
Pin Configuration
The MAX15026B/MAX15026C provide a soft-stop
feature to ramp down the output voltage at turn-off. The
soft-stop function is disabled in the MAX15026D.
TOP VIEW
V
IN
1
2
3
4
5
6
7
14 DH
13 LX
+
Applications
CC
Set-Top Boxes
PGOOD
EN
BST
DL
12
11
10
9
LCD TV Secondary Supplies
Switches/Routers
MAX15026
LIM
DRV
GND
RT
Power Modules
COMP
FB
*EP
DSP Power Supplies
Points-of-Load Regulators
8
TDFN
(3mm x 3mm)
*EP = EXPOSED PAD.
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