MAX8969_12 Datasheet, PDF (1/15 Pages) Maxim Integrated Products – Step-Up Converter for Handheld Applications

19-6038; Rev 1; 5/12
EVAALVUAAILTAIOBNLEKIT
Step-Up Converter
for Handheld Applications
General Description
The MAX8969 is a simple 1A step-up converter in a small
package that can be used in any single-cell Li-ion appli-
cation. This IC provides protection features such as input
undervoltage lockout, short circuit, and overtemperature
shutdown.
The IC transitions to skip mode seamlessly under light-
load conditions to improve efficiency. Under these
conditions, switching occurs only as needed, reducing
switching frequency and supply current to maintain high
efficiency.
When the input voltage is sufficient to drive the load, the
IC can be operated in track mode or automatic track
mode (ATM). In track mode, the p-channel MOSFET acts
as a current-limited load switch and quiescent current is
as low as 30µA under a no-load condition. In ATM mode,
the p-channel MOSFET acts as a current-limited load
switch and quiescent current is as low as 60µA under a
no-load condition. In ATM mode, the internal boost cir-
cuitry is enabled, allowing for fast transitions into boost
mode.
The IC is available in a small, 1.25mm x 1.25mm, 9-bump
WLP (0.4mm pitch) package.
Applications
Cell Phones
Smartphones
Mobile Internet Devices
GPS, PND
eBooks
Typical Operating Circuit
INPUT
2.5V TO 5.5V
CIN
4.7µF
L1
1µH
IN
LX_
OUT_
MAX8969
EN
OUTPUT
3.7V, 1A
COUT
22µF
TREN
GND_
Features
S Compact Layout
Small, 1.25mm x 1.25mm WLP Package
3MHz PWM Switching Frequency
Small External Components
S Safe and Efficient Step-Up Mode
Up to 1A Output Current
2.5V to 5.5V Input Voltage Range
3.3V to 5V Ouput Voltage Range
Over 90% Efficiency with Internal Synchronous
Rectifier
Low 45µA No-Load Quiescent Current
Soft-Start Controls Inrush Current
True Shutdown™
Low 1µA Shutdown Current
S Track Mode
1A Current Limited
130mI On-Resistance
Low 30µA No Load Quiescent Current
S Automatic Track Mode
130mI On-Resistance
Low 60µA No-Load Quiescent Current
Boost Circuitry Enabled for Fast Transition into
Boost
Ordering Information
PART
MAX8969EWL33+
MAX8969EWL35+
MAX8969EWL37+
MAX8969EWL42+
MAX8969EWL50+
VOUT
(V)
3.3
3.5
3.7
4.25
5.0
TEMP RANGE
-40NC to +85NC
-40NC to +85NC
-40NC to +85NC
-40NC to +85NC
-40NC to +85NC
PIN-
PACKAGE
9 WLP
9 WLP
9 WLP
9 WLP
9 WLP
Note: The output voltage range is from 3.3V to 5V. Contact the
factory for output options and availability.
+Denotes a lead(Pb)-free/RoHS-compliant package.
True Shutdown is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________ 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.