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Document Number: 10101
Revision 25-Feb-02
www.vishay.com
4
FX5545G001
Vishay
FEATURES
Fully integrated DC/DC converter
High efficiency over large load range
2MHz switching frequency
100% duty cycle
Power density - more than 80W/inch
3
1uA shutdown current
2.7V to 6V input range (1Li+ and 3-cell NiCd or NiMH cells)
1.5V to 3.6V output voltage with max output current of 600mA
Programmable PWM/PSM controls
Low output ripple
BGA/LGA construction
Temperature range: - 40
°C to + 85°C
No external components needed
Low profile
The DC/DC converter provides fully integrated synchronous
buck converter solution for the latest one-cell lithium ion cellu-
lar phones. Its input voltage is between 2.7V to 6V, capable of
delivering 600mA of output current at 1.5V to 3.6V.
The DC/DC converter combines the 2MHz-switching
controller with fully integrated passive components needed to
deliver the smallest and most efficient converter available
today. The high switching frequency minimizes the output
capacitance with peak to peak output ripple as low as 20mV.
The DC/DC converter delivers efficiency up to 95%.
The programmable pulse-skipping mode (PSM) maintains this
high efficiency even during the standby and idle modes to
increase overall battery life and talktime. In order to extract
the last ounce of power from the battery, the DC/DC converter
FX
5545
G001
FUNCTIONPAK
SIZE
SERIAL NUMBER
OUTPUT VOLTAGE-Example: 2.7V should be written as 2V7 as the V indicates the decimal point.
ORDERING INFORMATION
APPLICATION
Cellular and cordless phones, PDAs and others
Supply voltage source for low voltage chip sets
Portable computers
Battery back-up supplies
Digital cameras
is designed with 100% duty cycle control for this mode. This
function enables the DC/DC converter to operate like a
saturated linear regulator delivering the highest potential
output voltage for longer talk time.
The DC/DC converter is available in 20-ports BGA/LGA
package. In order to satisfy the stringent ambient temperature
requirements, the DC/DC converter is designed to handle the
industrial temperature range of - 40
°C to + 85°C.
Industry Smallest and Lowest Profile Synchronous DC/DC
Buck Converter with High Output Density Power