Product Description
The PE4259 UltraCMOS™ RF Switch is designed to cover a broad range of applications from near DC through 3000 MHz.
This reflective switch integrates on-board CMOS control logic with a low voltage CMOS-compatible control interface, and can be controlled using either single-pin or complementary control inputs. Using a nominal +3-volt power supply voltage, a typical input 1 dB compression point of +33.5 dBm can be achieved.
The PE4259 SPDT High Power UltraCMOS™ RF Switch is manufactured in Peregrine’s patented Ultra Thin Silicon UTSi®) CMOS process, offering the performance of GaAs with the economy and integration of conventional CMOS.

Features
*Single-pin or complementary CMOS logic control inputs
*Low insertion loss: 0.35 dB at 1000 MHz, 0.5 dB at 2000 MHz
*Isolation of 30 dB at 1000 MHz, 20 dB at 2000 MHz
*Typical input 1 dB compression point of +33.5 dBm
*Ultra-small SC-70 package

4259-01, 4259-02, 4259-00, 4259-51, 4259-52

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Description
This design note shows the ZXSC400 driving a single 3W LED. The input voltage ranges from 1.8V to 3.6V with constant output current of 700mA down to 2.6V with an overall 80% of efficiency.
Figure 1 shows typical constant current solution with ZXSC400 driving one 3W LED. The input
voltage range allows the use of two alkaline batteries or one Lithium Ion cell (CR123A) for
portable flashlight applications.
Q1 and Q2 forms a pseudo Darlington pair which provide enough current gain for a switching
current up to 1.5A. In order to provide better switch off performance, a Schottky diode, D2, is used to drain the base current from the base of Q1 directly. In order to achieve higher efficiency, current monitor U2 is used to provide a low voltage drop LED current sensing through the low ohmic resistor, R2. The LED current is converted to 300mV feedback voltage through R3.

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