Rainbow Electronics MAX17083 - Manual

General Description
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 25m
Ω 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.
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.
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.
The MAX17083 is available in a 24-pin 4mm x 4mm x
0.75mm TQFN package. The exposed backside pad
improves thermal characteristics.
Features
♦ Fixed-Frequency, Current-Mode Controller
♦ 2.4V to 5.5V Input Range
♦ Internal 5A Step-Down Regulator
♦ Internal BST Switch
♦ Fault Protection: Undervoltage, Overvoltage,
Thermal, Peak Current Limit
♦ Enable Input and Power-Good Output
♦ Voltage-Controlled Soft-Start
♦ High-Impedance Shutdown
♦ < 1µA (typ) Shutdown Current
MAX17083
Low-Voltage, Internal Switch,
Step-Down Regulator
________________________________________________________________ Maxim Integrated Products 1
TQFN
4mm x 4mm
+
MAX17083
19
20
21
22
1 2 3 4 5 6
18 17 16 15 14 13
23
24
12
11
10
9
8
7
N.C.
PGND
PGND
PGND
N.C.
LX LX IN IN
FREQ
POK
LX LX EN V
CC
SET
PGND
FB
GND
N.C.
GND
REF
GND
BST
TOP VIEW
Pin Configuration
19-4458; Rev 0; 2/09
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.
Ordering Information
PART TEMP RANGE PIN-PACKAGE
MAX17083ETG+ -40 °C to +85°C 24 TQFN
+ Denotes a lead(Pb)-free/RoHS-compliant package.
Applications
Low-Power Architectures
Ultra-Mobile PCs
Netbook and Nettop PCs
Portable Gaming
Notebook and Subnotebook Computers
PDAs and Mobile Communicators