Step-Up Converter. GS5801 Datasheet
3W, 0.85V Startup Voltage, Synchronous Step-Up
The GS5801 is a high efficiency synchronous
step-up converter that can provide up to 3W of
power to a boosted output from a low voltage
source. Unlike most step-up converter, not only
it starts up at a very low input voltage as low as
0.85V, it also incorporates circuits that
disconnect the input from output, during
shutdown, short-circuit, output current
overloading, or other events when output is
higher than the input. This eliminates the need
for an external MOSFET and its control circuitry
to disconnect the input from output, and
provides robust output overload protection.
The GS5801 starts up from a voltage as low as
0.85V making it ideal for applications with
single-cell or two-cell alkaline, NiCd, and NiMh
batteries. A switching frequency of 2MHz
minimizes solution footprint by allowing the use
of tiny and low profile inductors and ceramic
capacitors. An internal synchronous MOSFET
provides highest efficiency and with a current
mode control that is internally compensated,
external parts count is reduced to minimal.
GS5801 is available in two types, fixed output
voltage type and adjustable output voltage type. It
has fixed output voltage from 2.1V, 3.3V and 5V.
3W Output Power
Output to Input Reversed Current Protection
0.85V Low Start-up Voltage
VIN range from 0.6V to 4.5V
Fixed Output Voltage : 2.1V, 3.3V and 5V
Feedback Voltage : 0.6V (TYP)
Up to 96% Efficiency
40μA No load IQ and light load PFM Mode
Internal Synchronous Rectifier
Current Mode control
Logic Control Shutdown and Thermal
Miniature Packages : SOT-23-5L and
RoHS Compliant, 100%Pb & Halogen Free
USB OTG for MIDs, Smart phones
Mobile back-up Battery Chargers
Alkaline, NiCd, and NiMh batteries
USB powered devices
Fixed Voltage Type
Adjustable Voltage Type
Packages & Pin Assignments
Enable pin for the IC. Drive this pin high to enable the part, low to disable.
Feedback Input. Connect an external resistor divider from the output to FB and GND to set
Output pin. Bypass with a 22μF or larger ceramic capacitor closely between this pin and GND.
Inductor Connection. Connect an inductor Between SW and the regulator output.
Input Supply Voltage. Bypass with a 4.7μF ceramic capacitor to GND.