19-4092; Rev 0; 5/08
1A, 97% Efficiency, 30µA Quiescent Current
Step-Up Converter with True Shutdown
The MAX8815A DC-DC step-up converter is a high-effi-
ciency, low quiescent current, synchronous step-up
converter with True Shutdown™ and inrush-current lim-
iting. The MAX8815A generates any output voltage
from 3.3V to 5V from a 2-cell NiMH/NiCd or a single-cell
Li+/Li polymer battery.
The MAX8815A uses two modes of operation. The first
mode of operation (normal) uses only 30µA (typ) quies-
cent current and allows the converter to switch only
when needed at no load and light loads. Under moder-
ate and heavy loads (typically above 90mA), the
MAX8815A uses a fixed-frequency pulse-width modula-
tion (PWM) technique. This mode allows maximum effi-
ciency at light loads. The second mode of operation is
a fixed-frequency forced-pulse-width modulation
(FPWM) mode where the converter switches at a fixed
frequency irrespective of the load. This mode allows for
easy noise filtering and lower output ripple.
The MAX8815A has a preset 2.5A current limit, allowing
500mA load at 1.8V input and 1A load at 2.5V input when
the output is set to 5V. Features include soft-start, which
limits inrush current during startup, True Shutdown, and
internal compensation. The MAX8815A is available in a
compact 10-pin, 3mm x 3mm TDFN package.
The MAX8815A evaluation kit can help shorten the time
required for system design.
DSC and DVC
Microprocessor/DSP Core Power
Cell Phones, PDAs, MP3 Players
Portable Handheld Devices
True Shutdown is a trademark of Maxim Integrated Products, Inc.
10 9 8 7 6
♦ Up to 97% Efficiency with Internal Synchronous
♦ Low 30µA Quiescent Current
♦ Guaranteed 500mA Output Current at VOUT = 5V
from 1.8V Input
♦ Guaranteed 1A Output Current at 5V from 2.5V
♦ Low-Noise Constant Frequency Operation (FPWM
♦ 2MHz PWM Switching Frequency
♦ Preset (5V) or Adjustable Output
♦ Controlled Current in Soft-Start Limits Inrush
♦ True Shutdown
♦ Internal Compensation
♦ Overload/Short-Circuit Protection
♦ 0.1µA Shutdown Current
♦ Thermal Shutdown
♦ Compact 10-Pin, 3mm x 3mm TDFN Package
+Denotes a lead-free package.
*EP = Exposed pad.
Note: This device operates in the -40°C to +85°C extended
operating temperature range.
Typical Operating Circuit
1.2V TO 5.5V
5V UP TO 1A
________________________________________________________________ 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.