SC250EVB SEMTECH [Semtech Corporation], SC250EVB Datasheet - Page 7

• Manufacturer Part Number: SC250EVB
• Description: Step-Down DC-DC Converter with Bias LDO for RF Power Amplifi ers
• Manufacturer: SEMTECH [Semtech Corporation]

© 2006 Semtech Corp.
POWER MANAGEMENT
Pin Descriptions
Pin #
1
2
3
4
5
6
7
8
Pin Name
PGND
VDAC
VOUT
VREF
GND
VIN
EN
LX
Pin Function
Inductor connection to the switching FETs
Input voltage connection
2.85V, 20mA reference supply
to supply a resistive divider on V
Ground connection
Analog control voltage input ranges between 0.1 and 1.2V for control of V
with the V
the internal pass MOSFET.
Regulated output voltage and feedback
Enable digital input: a high input enables the SC250, a low disables the output and
reduces quiescent current to less than 1μA and LX becomes high impedance.
Ground reference for internal N-channel MOSFET
OUT
= 3 x V
DAC
transfer function. V
7
—
DAC
can be used as a supply for power amplifi er bias inputs or
to set a fi xed level of V
DAC
> 1.4V enables pass-through mode using
OUT
.
PRELIMINARY
OUT
www.semtech.com
in accordance
SC250