LTC4401-1ES6#TRMPBF

LTC4401-1/LTC4401-2 RF Power Controllers with 250kHz Loop BW and 45dB Dynamic Range U FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ DESCRIPTIO TM RF Power Amplifier Control in ThinSOT Package Internal Schottky Diode Detector with > 45dB Range Wide Input Frequency Range: 300MHz to 2.7GHz (LTC4401-1) 300MHz to 2GHz (LTC4401-2) Autozero Loop Cancels Offset Errors and Temperature Dependent Offsets Wide VCC Range: 2.7V to 6V Automatic Bandwidth Control Improves Low Power Ramp Response Allows Direct Connection to Battery RF Output Power Set by External DAC Internal Frequency Compensation Rail-to-Rail Power Control Output Power Control Signal Overvoltage Protection Low Operating Current: 1mA Low Shutdown Current: 10µA Two Pole PCTL Input Filtering Low Profile (1mm) SOT-23 (ThinSOT™) (LTC4401-1) and 8-Pin MSOP (LTC4401-2) Packages U APPLICATIO S ■ ■ ■ RF power is controlled by driving the RF amplifier power control pins and sensing the resultant RF output power via a directional coupler. The RF sense voltage is peak detected using an on-chip Schottky diode. This detected voltage is compared to the DAC voltage at the PCTL pin to control the output power. The RF power amplifier is protected against high power control pin voltages. Internal and external offsets are cancelled over temperature by an autozero control loop, allowing accurate low power programming. The shutdown feature disables the part and reduces the supply current to < 10µA. A dual control channel version (LTC4401-2) is also available in an 8-pin MSOP package. , LTC and LT are registered trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. GSM/GPRS Cellular Telephones PCS Devices Wireless Data Modems U.S. TDMA Cellular Phones U ■ The LTC®4401-1 is a SOT-23 RF power controller for slow turn-on RF power amplifiers operating in the 300MHz to 2.7GHz range. The loop bandwidth is set at 250kHz to improve frequency stability when controlling slow turn-on RF power amplifiers such as the Conexant CX77301/CX77302, CX77304, CX77314, Anadigics AWT6107 and the RF Micro Devices RF3160. TYPICAL APPLICATIO LTC4401-1 Dual Band Cellular Telephone Transmitter 68Ω 33pF Li-Ion 6 0.1µF RF VCC BAND SELECT 1 LTC4401-1 SHDN 4 3 DAC SHDN VPCA PCTL GND 5 2 VPC 900MHz INPUT 1.8GHz INPUT 900MHz OUTPUT PA MODULE 1.8GHz OUTPUT 50Ω 4401 TA01 4401fa 1 LTC4401-1/LTC4401-2 W W W AXI U U ABSOLUTE RATI GS (Note 1) VCC to GND .............................................. – 0.3V to 6.5V VPCA/B Voltage to GND ............................ – 0.3V to 3.2V PCTL Voltage to GND ................. – 0.3V to (VCC + 0.3V) RF Voltage to GND ............................ (VCC – 2.6V) to 7V BSEL, SHDN Voltage to GND ...... – 0.3V to (VCC + 0.3V) IVPCA/B .................................................................. 10mA Operating Temperature Range (Note 2) .. – 30°C to 85°C Storage Temperature Range ................ – 65°C to 150°C Maximum Junction Temperature ......................... 125°C Lead Temperature (Soldering, 10 sec)................. 300°C U U W PACKAGE/ORDER I FOR ATIO ORDER PART NUMBER TOP VIEW RF 1 6 VCC GND 2 5 VPCA PCTL 3 4 SHDN LTC4401-1ES6 S6 PACKAGE 6-LEAD PLASTIC TSOT-23 ORDER PART NUMBER TOP VIEW VCC VPCA VPCB GND 1 2 3 4 8 7 6 5 RF BSEL SHDN PCTL LTC4401-2EMS8 S6 PART MARKING MS8 PACKAGE 8-LEAD PLASTIC MSOP MS8 PART MARKING LTXA TJMAX = 125°C, θJA = 250°C/W LTXC TJMAX = 125°C, θJA = 230°C/W Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 3.6V, SHDN = HI, unless otherwise noted. PARAMETER CONDITIONS MIN VCC Operating Voltage ● TYP MAX 6 V 10 20 µA 2.7 UNITS IVCC Shutdown Current SHDN = 0V ● IVCC Operating Current SHDN = HI, IVPCA/B = 0mA ● VPCA/B VOL RLOAD = 400Ω, Enabled ● VPCA/B Dropout Voltage ILOAD = 6mA, VCC = 3V ● VPCA/B Voltage Clamp PCTL = 1V ● 2.7 2.9 VPCA/B Output Current VPCA/B = 2.4V, VCC = 3V ● 7 10 VPCA/B Enable Time SHDN = VCC (Note 5) 9 10.2 µs VPCA/B Bandwidth CLOAD = 100pF, RLOAD = 2k (Note 8) 175 250 130 330 kHz kHz VPCA/B Load Capacitance (Note 6) ● 100 pF VPCA/B Slew Rate VPCTL = 2V Step, CLOAD = 100pF, RLOAD = 400Ω (Note 3) ● 1.2 0 ● PCTL < 80mV PCTL > 160mV ● 1 VPCA/B Droop mA V VCC – 0.25 V 3.1 V mA 2 Open Loop (Note 9) ● 300 BSEL, SHDN Input Threshold VCC = 2.7V to 6V ● 0.35 BSEL, SHDN Input Current BSEL = SHDN = 3.6V ● 16 PCTL Input Voltage Range (Note 7) ● 0 ● 60 PCTL Input Resistance PCTL Input Filter 450 24 90 550 mV 1.4 V 36 µA 2.4 V 120 270 (Note 4) ● V/µs µV/ms 1 VPCA/B Start Voltage Autozero Range 1.5 1.9 0.05 kΩ kHz 400 mV 4401fa 2 LTC4401-1/LTC4401-2 ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 3.6V, SHDN = HI, unless otherwise noted. PARAMETER CONDITIONS MIN MAX UNITS RF Input Frequency Range LTC4401-1 (Note 6) LTC4401-2 (Note 6) 300 300 2700 2000 MHz MHz RF Input Power Range (LTC4401-1) RF Frequency = 900MHz (Note 6) RF Frequency = 1800MHz (Note 6) RF Frequency = 2400MHz (Note 6) RF Frequency = 2700MHz (Note 6) –28 –26 –24 –22 18 18 16 16 dBm dBm dBm dBm RF Input Power Range (LTC4401-2) RF Frequency = 900MHz (Note 6) RF Frequency = 2000MHz (Note 6) –28 –26 18 18 dBm dBm RF Input Resistance Referenced to VCC 350 Ω 150 ● Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LTC4401-X is guaranteed to meet performance specifications from 0°C to 70°C. Specifications over the – 30°C to 85°C operating temperature range are assured by design, characterization and correlation with statistical process controls. Note 3: Slew rate is measured open loop. The slew time at VPCA/B is measured between 1V and 2V. Note 4: Maximum DAC zero-scale offset voltage that can be applied to PCTL. TYP 250 Note 5: This is the time from SHDN rising edge 50% switch point to VPCA = 0.25V. Note 6: Guaranteed by design. This parameter is not production tested. Note 7: Includes maximum DAC offset voltage and maximum control voltage. Note 8: Bandwidth is calculated using the 10% to 90% rise time: BW = 0.35/rise time Note 9: Measured 12µs after SHDN = HI. U W 10000 75°C 25°C –30°C 1000 100 10 1 –28 –22 –16 –10 –4 2 8 RF INPUT POWER (dBm) 14 4401 G01 LTC4401-1 Detector Characteristics at 1800MHz 10000 75°C 25°C –30°C 1000 100 10 1 –26 –20 –14 –8 –2 4 10 RF INPUT POWER (dBm) 16 4401 G02 PCTL REFERENCED DETECTOR OUTPUT VOLTAGE (mV) LTC4401-1 Detector Characteristics at 900MHz PCTL REFERENCED DETECTOR OUTPUT VOLTAGE (mV) PCTL REFERENCED DETECTOR OUTPUT VOLTAGE (mV) TYPICAL PERFOR A CE CHARACTERISTICS LTC4401-1 Detector Characteristics at 2400MHz 10000 75°C 25°C –30°C 1000 100 10 1 –24 –20 –16 –12 –8 –4 0 4 8 RF INPUT POWER (dBm) 12 16 4401 G03 4401fa 3 LTC4401-1/LTC4401-2 U W 10000 75°C 25°C –30°C 1000 100 10 1 –22 –18 –14 –10 –6 –2 2 6 RF INPUT POWER (dBm) 10 14 LTC4401-2 Detector Characteristics at 900MHz 10000 75°C 25°C –30°C 1000 100 10 1 –28 –22 –16 –10 –4 2 8 RF INPUT POWER (dBm) 4401 G04 U U U PI FU CTIO S 14 4401 G05 PCTL REFERENCED DETECTOR OUTPUT VOLTAGE (mV) LTC4401-1 Detector Characteristics at 2700MHz PCTL REFERENCED DETECTOR OUTPUT VOLTAGE (mV) PCTL REFERENCED DETECTOR OUTPUT VOLTAGE (mV) TYPICAL PERFOR A CE CHARACTERISTICS LTC4401-2 Detector Characteristics at 1800MHz 10000 75°C 25°C –30°C 1000 100 10 1 –26 –20 –14 –8 –2 4 10 RF INPUT POWER (dBm) 16 4401 G06 (LTC4401-1/LTC4401-2) RF (Pins 1/8): RF Feedback Voltage from the Directional Coupler. Referenced to VCC. A coupling capacitor of 33pF must be used to connect to the ground referenced directional coupler. The frequency range is 300MHz to 2700MHz for the LTC4401-1 and 300MHz to 2000MHz for the LTC4401-2. This pin has an internal 250Ω termination, an internal Schottky diode detector and peak detector capacitor. SHDN (Pins 4/6): Shutdown Input. A logic low on the SHDN pin places the part in shutdown mode. A logic high places the part in enable mode. SHDN has an internal 150k pulldown resistor to ensure that the part is in shutdown when the drivers are in a three-state condition. GND (Pins 2/4): System Ground. VCC (Pins 6/1): Input Supply Voltage, 2.7V to 6V. VCC should be bypassed with 0.1µF and 100pF ceramic capacitors. Used as return for RF 250Ω termination. PCTL (Pins 3/5): Analog Input. The external power control DAC drives this input. The amplifier servos the RF power until the RF detected signal equals the DAC signal. The input impedance is typically 90kΩ. VPCB (Pin 3): (LTC4401-2 Only) Power Control Voltage Output. This pin drives an external RF power amplifier power control pin. The maximum load capacitance is 100pF. VPCA (Pins 5/2): Power Control Voltage Output. This pin drives an external RF power amplifier power control pin. The maximum load capacitance is 100pF. BSEL (Pin 7): (LTC4401-2 Only) Selects VPCA when Low and VPCB when High. This input has an internal 150k resistor to ground. 4401fa 4 LTC4401-1/LTC4401-2 W BLOCK DIAGRA (LTC4401-1) 68Ω RF IN 33pF RF PA 50Ω Li-Ion VCC 6 TXENB AUTOZERO – AZ + + – GAIN COMPRESSION GM + 250Ω RF 1 + – 30k 28pF 30k 60µA GND CLAMP 80mV + 270kHz FILTER + CC 5 BUFFER 38k – RF DET VPCA 30k – 60µA 22k VREF 51k 30k + 2 – 33.4k 6k 12Ω TXENB VBG VREF 10µs DELAY CONTROL 100Ω 150k LTC4401-1 4 3 SHDN PCTL 4401-1 BD 4401fa 5 LTC4401-1/LTC4401-2 W BLOCK DIAGRA (LTC4401-2) DIPLEXER 68Ω 900MHZ RF PA 1.8GHz/1.9GHz RF PA 50Ω 33pF Li-Ion VCC 1 TXENB AUTOZERO – AZ + + – GAIN COMPRESSION BUF A GM + 250Ω RF 8 + – 30k 28pF 30k 60µA GND 80mV + MUX1 MUX2 CC 38k – RF DET 30k – 60µA 22k VREF 51k 30k + 4 12Ω 33.4k VPCB 100Ω 6k TXENB VREF 3 BUF B – VBG VPCA CLAMP 270kHz FILTER + 2 12Ω 10µs DELAY VPCA CONTROL 100Ω 150k 150k LTC4401-2 6 5 7 SHDN PCTL BSEL 4401-2 BD 4401fa 6 LTC4401-1/LTC4401-2 U W U U APPLICATIONS INFORMATION Operation The LTC4401-X RF power control amplifier integrates several functions to provide RF power control over frequencies ranging from 300MHz to 2.7GHz. This product is well suited to control RF power amplifiers that exhibit slow turn-on times. The device also prevents damage to the RF power amplifier due to overvoltage conditions. These functions include an internally compensated power control amplifier to control the RF output power, an autozero section to cancel internal and external voltage offsets, an RF Schottky diode peak detector and amplifier to convert the RF feedback signal to DC, a VPCA/B overvoltage clamp, compression and a bandgap reference. Band Selection The LTC4401-2 is designed to drive two separate power control lines. The BSEL pin will select VPCA when low and VPCB when high. BSEL must be established prior to SHDN being asserted high. Control Amplifier The control amplifier supplies the power control voltage to the RF power amplifier. A portion (typically – 19dB for low frequencies and –14dB for high frequencies) of the RF output voltage is sampled, via a directional coupler, to close the gain control loop. When a DAC voltage is applied to PCTL, the amplifier quickly servos VPCA/B positive until the detected feedback voltage applied to the RF pin matches the voltage at PCTL. This feedback loop provides accurate RF power control. VPCA/B is capable of driving a 6mA load current and 100pF load capacitor. Control Amplifier Compression The gain compression breakpoints are at PCTL = 80mV and PCTL = 160mV. Above 160mV the gain does not change. The compression changes the feedback attenuation thereby reducing the loop gain. RF Detector The internal RF Schottky diode peak detector and amplifier converts the RF feedback voltage from the directional coupler to a low frequency voltage. This voltage is compared to the DAC voltage at the PCTL pin by the control amplifier to close the RF power control loop. The RF pin input resistance is typically 250Ω and the frequency range of this pin is 300MHz to 2700MHz for the LTC4401-1 and 300MHz to 2000MHz for the LTC4401-2. The detector demonstrates excellent efficiency over a wide range of input power. The Schottky detector is biased at about 60µA and drives an on-chip peak detector capacitor of 28pF. Autozero An autozero system is included to improve power programming accuracy over temperature. This section cancels internal offsets associated with the Schottky diode detector and control amplifier. External offsets associated with the DAC driving the PCTL pin are also cancelled. Offset drift due to temperature is cancelled between each burst. The maximum offset voltage allowed at the DAC output is limited to 400mV. Autozeroing is performed during a 10µs period after SHDN is asserted high. An internal timer enables the VPCA/B output after 10µs. The autozero capacitors are held and the VPCA/B pin is connected to the control amplifier output. The hold droop voltage of typically < 1µV/ms provides for accurate offset cancellation. The part should be shut down between bursts or after multiple consecutive bursts. Filter There is a 270kHz two pole filter included in the PCTL path to remove DAC noise. Protection Features The RF power amplifier control voltage pin is overvoltage protected. The VPCA/B overvoltage clamp regulates VPCA/B to 2.9V when the gain and PCTL input combination attempts to exceed this voltage. Modes of Operation Shutdown: The part is in shutdown mode when SHDN is low. VPCA/B is held at ground and the power supply current is typically 10µA. 4401fa 7 LTC4401-1/LTC4401-2 U W U U APPLICATIO S I FOR ATIO Enable: When SHDN is asserted high the part will automatically calibrate out all offsets. This takes 160mV 4401fa 10 LTC4401-1/LTC4401-2 U W U U APPLICATIO S I FOR ATIO Users should note very carefully the following factors regarding this model: Model performance in general will reflect typical baseline specs for a given device, and certain aspects of performance may not be modeled fully. While reasonable care has been taken in the preparation, we cannot be responsible for correct application on any and all computer systems. Model users are hereby notified that these models are supplied “as is”, with no direct or implied responsibility on the part of LTC for their operation within a customer circuit or system. Further, Linear Technology Corporation reserves the right to change these models without prior notice. CONTROL AMPLIFER RF POWER AMP + CONTROLLED RF OUTPUT POWER VPC PCTL G1 G2 – IFB LTC4401-X H1 RF H2 4401 F04 RF DETECTOR DIRECTIONAL COUPLER 14dB to 20dB LOSS Figure 4. Closed-Loop Block Diagram The user agrees that this model is licensed from Linear Technology and agrees that the model may be used, loaned, given away or included in other model libraries as long as this notice and the model in its entirety and unchanged is included. No right to make derivative works or modifications to the model is granted hereby. All such rights are reserved. This model is provided as is. Linear Technology makes no warranty, either expressed or implied about the suitability or fitness of this model for any particular purpose. In no event will Linear Technology be liable for special, collateral, incidental or consequential damages in connection with or arising out of the use of this model. It should be remembered that models are a simplification of the actual circuit. 80 70 60 50 40 30 20 10 0 –10 –20 –30 –40 –50 –60 100 1k 180 RLOAD = 2k 160 CLOAD = 33pF 140 120 PHASE 100 80 60 GAIN 40 20 0 –20 –40 –60 –80 –100 10k 100k 1M 10M FREQUENCY (Hz) PHASE (DEG) In all cases, the current data sheet information is your final design guideline, and is the only performance guarantee. For further technical information, refer to individual device data sheets. Your feedback and suggestions on this model is appreciated. Linear Technology Corporation hereby grants the users of this model a nonexclusive, nontransferable license to use this model under the following conditions: VOLTAGE GAIN (dB) This model (Figure 6) is being supplied to LTC users as an aid to circuit designs. While the model reflects reasonably close similarity to corresponding devices in low frequency AC performance terms, its use is not suggested as a replacement for breadboarding. Simulation should be used as a forerunner or a supplement to traditional lab testing. 4401 F05 Figure 5. SPICE Model Open-Loop Gain and Phase Characteristics from RF to VPCA, PCTL < 80mV 4401fa 11 LTC4401-1/LTC4401-2 U W U U APPLICATIO S I FOR ATIO *LTC4401-X Low Frequency AC Spice Model* *July 11, 2001 *Main Network Description GGIN1 ND3 0 ND2 IFB 86E-6 GGXFB IFB 0 0 ND12 33E-6 GGX5 ND11 0 0 ND10 1E-6 GGX6 ND12 0 0 ND11 1E-6 GGX1 ND4 0 0 ND3 1E-6 GGX2 ND6 0 0 ND4 1E-6 GGX3 ND7 0 0 ND6 1E-6 GGX4 ND8 0 0 ND7 1E-6 EEX1 ND9 0 0 ND8 2 CCC1 ND3 0 75E-12 CCPCTL2 ND2 0 7E-12 CCPCTL1 ND1 0 13E-12 CCLINT VPCA 0 5E-12 CCLOAD VPCA 0 33E-12 CCFB1 IFB 0 2.4E-12 CCX5 ND11 0 16E-15 CCX6 ND12 0 1.2E-15 CCP ND10 0 28E-12 CCX2 ND6 0 8E-15 CCX3 ND7 0 32E-15 LLX1 ND5 0 65E-3 RR01 ND3 0 20E6 RRFILT ND2 ND1 44E3 RRPCTL1 PCTL ND1 51E3 RRPCTL2 ND1 0 38E3 RR9 VPCA ND9 50 RRLOAD VPCA 0 2E3 RRFB1 IFB 0 22E3 RRT RF 0 250 RRX5 ND11 0 1E6 RRX6 ND12 0 1E6 RRSDRF ND10 500 RRX1 ND4 ND5 1E6 RRX2 ND6 0 1E6 RRX3 ND7 0 1E6 RRX4 ND8 0 1E6 **Closed-loop feedback, comment-out VPCTLO, VRF, Adjust EFB gain to reflect external gain, currently set at 3X** *EFB RF 0 VPCA VIN 3 *VIN VIN 0 DC 0 AC 1 *VPCTLO PCTL 0 DC 0 **Open-loop connections, comment-out EFB, VIN and VPCTLO****** VPCTLO PCTL 0 DC 0 VRF RF 0 DC 0 AC 1 ******Add AC statement and print statement as required*** .AC DEC 50 100 1E7 *****for PSPICE only***** .OP .PROBE ************************* .END Figure 6. LTC4401-X Low Frequency AC SPICE Model 4401fa 12 LTC4401-1/LTC4401-2 U W U U APPLICATIO S I FOR ATIO PCTL RPCTL1 51E3 CPCTL1 13E-12 ND2 GIN1 + RFILT 44E3 RPCTL2 38E3 C PCTL2 7E-12 – 86E-6 GX1 + RO1 20E6 GM ND6 ND4 ND3 ND1 GM – CC1 75E-12 1E-6 RX1 1E6 ND5 GX2 + LX1 65E-3 – + RX2 1E6 GM 1E-6 – IFB 1E-6 GX4 + RX3 1E6 GM CX2 8E-15 ND8 ND7 GX3 RX4 1E6 GM – CX3 32E-15 1E-6 ND8 2X BUFFER RF ND11 RT 250Ω RX5 1E6 GM ND10 CP 28E-12 GX5 + RSD 500Ω – 1E-6 ND12 RX6 1E6 GM – CX5 16E-15 GX6 + 1E-6 33E-6 EX1 + RFB1 22E3 GM – CX6 1.2E-15 GXFB + R9 50Ω VAMP CFB1 2.4E-12 – 2 CLINT 5E-12 ND9 VPCA RLOAD 2E3 CLOAD 33E-12 4401 F07 Figure 7. LTC4401-X Low Frequency AC Model 4401fa 13 LTC4401-1/LTC4401-2 U PACKAGE DESCRIPTIO S6 Package 6-Lead Plastic TSOT-23 (Reference LTC DWG # 05-08-1636) 0.62 MAX 2.90 BSC (NOTE 4) 0.95 REF 1.22 REF 3.85 MAX 2.62 REF 1.4 MIN 2.80 BSC 1.50 – 1.75 (NOTE 4) PIN ONE ID RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR 0.30 – 0.45 6 PLCS (NOTE 3) 0.95 BSC 0.80 – 0.90 0.20 BSC 0.01 – 0.10 1.00 MAX DATUM ‘A’ 0.30 – 0.50 REF 0.09 – 0.20 (NOTE 3) 1.90 BSC S6 TSOT-23 0302 NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLUSIVE OF PLATING 4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 5. MOLD FLASH SHALL NOT EXCEED 0.254mm 6. JEDEC PACKAGE REFERENCE IS MO-193 4401fa 14 LTC4401-1/LTC4401-2 U PACKAGE DESCRIPTIO MS8 Package 8-Lead Plastic MSOP (Reference LTC DWG # 05-08-1660) 0.889 ± 0.127 (.035 ± .005) 5.23 (.206) MIN 3.20 – 3.45 (.126 – .136) 0.42 ± 0.038 (.0165 ± .0015) TYP 3.00 ± 0.102 (.118 ± .004) (NOTE 3) 0.65 (.0256) BSC 8 7 6 5 0.52 (.0205) REF RECOMMENDED SOLDER PAD LAYOUT 0.254 (.010) 3.00 ± 0.102 (.118 ± .004) (NOTE 4) 4.90 ± 0.152 (.193 ± .006) DETAIL “A” 0° – 6° TYP GAUGE PLANE 0.53 ± 0.152 (.021 ± .006) DETAIL “A” 1 2 3 4 1.10 (.043) MAX 0.86 (.034) REF 0.18 (.007) SEATING PLANE 0.22 – 0.38 (.009 – .015) TYP 0.65 (.0256) BSC 0.127 ± 0.076 (.005 ± .003) MSOP (MS8) 0204 NOTE: 1. DIMENSIONS IN MILLIMETER/(INCH) 2. DRAWING NOT TO SCALE 3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX 4401fa Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. 15 LTC4401-1/LTC4401-2 U TYPICAL APPLICATION LTC4401-2 Dual Band Cellular Telephone Transmitter 68Ω 33pF LTC4401-2 VIN VCC RF Li-Ion SHDN SHDN VPCA BSEL BSEL VPCB GND PCTL 0.1µF 900MHz DIRECTIONAL COUPLER DIPLEXER RF PA 50Ω DAC 1.8GHz/ 1.9GHz RF PA 4401 TA03 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LTC1503 Inductorless Step-Down DC/DC Converter 600kHz, Up to 100mA, 25% Higher Efficiency Than Linear Regulator LTC1555L-1.8 SIM Power Supply and Level Translator Generates 1.8V, 3V or 5V; >10kV ESD on All SIM Contact Pins LT 1615 Step-Up DC/DC Converter ThinSOT, Low 20µA Quiescent Current, VIN as Low as 1V, 300mA IOUT LT1617 Inverting DC/DC Converter ThinSOT, Low 20µA Quiescent Current, VIN as Low as 1V, 300mA IOUT LTC1682 Low Noise Charge Pump with LDO 60µVRMS Output Noise, Small MSOP Package LTC1734 SOT-23 Li-Ion Battery Charger Up to 700mA Charge Current, Only Two External Components LT1761 Low Dropout, Low Noise Linear Regulator ThinSOT, 300mV Dropout at 100mA, 20µVRMS Output Noise (10Hz to 100kHz) LTC1878 Step-Down DC/DC Converter Integrated Synchronous Operation, Up to 95% Efficiency, 1A Switch Current. LTC1911 Low Noise, Inductorless Buck Controller 2.7V ≤ VIN ≤ 5.5V, IOUT ≤ 250mA, 1.5MHz, 8-Pin MSOP LTC1928 Low Noise Charge Pump ThinSOT, 90µVRMS Output Noise (100kHz BW), IOUT Up to 30mA LT1932 White LED Driver ThinSOT, 1.2MHz DC/DC Constant-Current LED Driver, Dimming Control LT1944 Step-Up DC/DC Converter Dual Output for LCD Bias, Low Quiescent Current of 20µA, 1.2V ≤ VIN ≤ 15V LTC1986 SIM Power Supply ThinSOT, 3V and 5V, Ultralow Supply Current of 14µA, 40dB Dynamic Range, 300MHz to 3GHz, Buffered Detector Output ® 4401fa 16 Linear Technology Corporation LT/TP 0204 1K REV A • PRINTED IN THE USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com  LINEAR TECHNOLOGY CORPORATION 2001