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SC250 Datasheet

  • SC250

  • Step-Down DC-DC Converter with Bias LDO for RF Power Amplifi...

  • 844.64KB

  • 18頁

  • SEMTECH   SEMTECH

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Step-Down DC-DC Converter with
Bias LDO for RF Power Ampli鏗乪rs
POWER MANAGEMENT
Description
The SC250 is a synchronous step-down converter
designed speci鏗乧ally for use as an adaptive voltage
supply for CDMA and WCDMA RF Power Ampli鏗乪rs (PAs).
The output voltage can be adjusted dynamically between
0.3V and (Vin - 0.4)V through a linear analog control input.
For high power operation, a maximum control input signal
level forces the device into bypass mode where the input
is connected directly to the output via an internal P-
Channel pass transistor. Bypass mode also occurs when
the output load demands duty cycles in excess of the
maximum rated duty cycle.
The SC250 also provides an LDO regulator which can be
used to supply a 2.85V bias to the PA. The internal clock
runs at 1MHz to maximize ef鏗乧iency while still allowing
the use of small surface mount inductors and capacitors
can be used.
The peak current rating of the internal PMOS switch allows
a DC output current of 600mA. The bypass PMOS current
rating allows a minimum of 1A DC output current in the
bypass mode. Shutdown turns off all the control circuitry
to achieve a typical shutdown current of 0.1渭A.
SC250
Features
Adjustable output voltage range 鈥?0.3 to 3.6V
Linearly proportional V
DAC
to V
OUT
relationship for
increased PA ef鏗乧iency
Pass-through mode automatic and on demand
Input voltage range 鈥?2.7V to 5V
Typical settling time 鈥?40渭s
Output current capability 鈥?600mA
Maximum output current in bypass mode 鈥?1A
Up to 96% ef鏗乧iency
Constant frequency operation 鈥?1MHz
Less than 1渭A shutdown current
Internal 75m惟 PMOS bypass transistor
PA bias voltage supply 鈥?2.85V, 20mA, 1.5%
MLPD-W8, 2.3 x 2.3mm package
Applications
CDMA and WCDMA Phones
Handheld Radios
RF PC Cards
Battery Powered RF Devices
Typical Application Circuit
V
IN
C
IN
10渭F
2
VIN
LX
VOUT
1
6
L1
4.7渭H
C
OUT
4.7渭F
Vcc
ENABLE
VDAC
7
5
8
SC250
EN
VDAC
PGND
VREF
GND
3
4
C
REF
1渭F
RF Input
BIAS
PA
GND
RF Output
August 28, 2006
1
www.semtech.com

SC250 產(chǎn)品屬性

  • 2900 Hz Continuous

  • SSS.igsSSS.stp

  • 200

  • 音頻產(chǎn)品

  • 蜂鳴器

  • Sonalert®

  • 指示燈，內(nèi)部驅動

  • 壓電

  • AC，DC

  • -

  • 60 ~ 250V

  • 2.9kHz

  • 連續(xù)

  • 68dB @ 60V，61cm

  • 5 ~ 18mA

  • 無

  • 面板安裝

  • 螺釘端子

  • 圓形 - 42.85mm 直徑 x 32.85mm H

  • 散裝

  • -

  • -30°C ~ 65°C

  • 458-1109-ND - GASKET NEMA 4X FOR 1SC SERIES

  • 458-1020

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