19-4458; Rev 0; 2/09
Low-Voltage, Internal Switch,
Step-Down Regulator
MAX17083
General Description
Features
The MAX17083 is a fixed-frequency, current-mode,
step-down regulator optimized for low-voltage, low-
power applications. This regulator features dual internal
n-channel MOSFET power switches for high efficiency
and reduced component count. External Schottky
diodes are not required. An integrated boost switch
eliminates the need for an external boost diode. The
internal 25mΩ low-side power MOSFET easily supports
continuous load currents up to 5A. The MAX17083 pro-
duces an adjustable 0.75V to 2.7V output voltage from
the system’s 3.3V or 5V input supply.
o Fixed-Frequency, Current-Mode Controller
o 2.4V to 5.5V Input Range
o Internal 5A Step-Down Regulator
o Internal BST Switch
o Fault Protection: Undervoltage, Overvoltage,
Thermal, Peak Current Limit
o Enable Input and Power-Good Output
o Voltage-Controlled Soft-Start
o High-Impedance Shutdown
This step-down regulator uses a peak current-mode
control scheme to eliminate the additional external
compensation required by voltage-mode architectures,
providing an easy-to-implement architecture without
sacrificing fast transient response. The MAX17083 pro-
vides peak current-limit protection and operates in
light-load pulse-skipping mode to maintain high effi-
ciency under light-load conditions.
o < 1µA (typ) Shutdown Current
Applications
Low-Power Architectures
Ultra-Mobile PCs
Netbook and Nettop PCs
Portable Gaming
Independent enable input and open-drain power-good
output allow flexible system power sequencing. The volt-
age soft-start gradually ramps up the output voltage
within a predictable time period, effectively limiting the
inrush current. The MAX17083 features output undervolt-
age, output overvoltage, and thermal-fault protection.
Notebook and Subnotebook Computers
PDAs and Mobile Communicators
Ordering Information
The MAX17083 is available in a 24-pin 4mm x 4mm x
0.75mm TQFN package. The exposed backside pad
improves thermal characteristics.
PART
TEMP RANGE
PIN-PACKAGE
MAX17083ETG+
-40°C to +85°C
24 TQFN
+Denotes a lead(Pb)-free/RoHS-compliant package.
Pin Configuration
TOP VIEW
18 17 16 15 14 13
19
12
N.C.
FB
PGND 20
11 N.C.
21
22
23
24
10
9
PGND
PGND
GND
GND
MAX17083
PGND
N.C.
GND
REF
8
+
7
1
2
3
4
5
6
TQFN
4mm x 4mm
________________________________________________________________ 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.