LTC4401-1

LTC4401-1/LTC4401-2 RF Power Controllers with 250kHz Loop BW and 45dB Dynamic Range FEATURES s s s DESCRIPTIO TM s s s s s s s s s s s s 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 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. 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. APPLICATIO S s s s s GSM/GPRS Cellular Telephones PCS Devices Wireless Data Modems U.S. TDMA Cellular Phones TYPICAL APPLICATIO LTC4401-1 Dual Band Cellular Telephone Transmitter 68Ω 33pF Li-Ion 0.1µF 6 VCC LTC4401-1 SHDN 4 SHDN VPCA 5 VPC 900MHz INPUT 1.8GHz INPUT 900MHz OUTPUT RF 1 BAND SELECT 3 DAC PCTL GND 2 PA MODULE 1.8GHz OUTPUT 50Ω 4401 TA01 U 4401fa U U 1 LTC4401-1/LTC4401-2 ABSOLUTE AXI U RATI GS 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) PACKAGE/ORDER I FOR ATIO TOP VIEW RF 1 GND 2 PCTL 3 6 VCC 5 VPCA 4 SHDN ORDER PART NUMBER LTC4401-1ES6 S6 PART MARKING LTXA S6 PACKAGE 6-LEAD PLASTIC TSOT-23 TJMAX = 125°C, θJA = 230°C/W Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS PARAMETER VCC Operating Voltage IVCC Shutdown Current IVCC Operating Current VPCA/B VOL VPCA/B Dropout Voltage VPCA/B Voltage Clamp VPCA/B Output Current VPCA/B Enable Time VPCA/B Bandwidth VPCA/B Load Capacitance VPCA/B Slew Rate VPCA/B Droop VPCA/B Start Voltage BSEL, SHDN Input Threshold BSEL, SHDN Input Current PCTL Input Voltage Range PCTL Input Resistance PCTL Input Filter Autozero Range (Note 4) Open Loop (Note 9) VCC = 2.7V to 6V BSEL = SHDN = 3.6V (Note 7) SHDN = 0V SHDN = HI, IVPCA/B = 0mA RLOAD = 400Ω, Enabled ILOAD = 6mA, VCC = 3V PCTL = 1V VPCA/B = 2.4V, VCC = 3V SHDN = VCC (Note 5) CONDITIONS The q 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. MIN q q q q q q q q CLOAD = 100pF, RLOAD = 2k (Note 8) (Note 6) VPCTL = 2V Step, CLOAD = 100pF, RLOAD = 400Ω (Note 3) 2 U U W WW U W (Note 1) 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 TOP VIEW VCC VPCA VPCB GND 1 2 3 4 8 7 6 5 RF BSEL SHDN PCTL ORDER PART NUMBER LTC4401-2EMS8 MS8 PART MARKING LTXC MS8 PACKAGE 8-LEAD PLASTIC MSOP TJMAX = 125°C, θJA = 250°C/W TYP 10 1.2 MAX 6 20 1.9 0.05 VCC – 0.25 UNITS V µA mA V V V mA µs kHz kHz pF V/µs µV/ms 2.7 0 2.7 7 175 2.9 10 9 250 130 1.5 1 3.1 10.2 330 100 PCTL < 80mV PCTL > 160mV q q q 1 2 q q q q q 300 0.35 16 0 60 450 24 90 270 550 1.4 36 2.4 120 400 mV V µA V kΩ kHz mV 4401fa q LTC4401-1/LTC4401-2 ELECTRICAL CHARACTERISTICS PARAMETER RF Input Frequency Range RF Input Power Range (LTC4401-1) CONDITIONS LTC4401-1 (Note 6) LTC4401-2 (Note 6) The q 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. MIN 300 300 –28 –26 –24 –22 –28 –26 q TYP MAX 2700 2000 18 18 16 16 18 18 UNITS MHz MHz dBm dBm dBm dBm dBm dBm Ω RF Frequency = 900MHz (Note 6) RF Frequency = 1800MHz (Note 6) RF Frequency = 2400MHz (Note 6) RF Frequency = 2700MHz (Note 6) RF Frequency = 900MHz (Note 6) RF Frequency = 2000MHz (Note 6) Referenced to VCC RF Input Power Range (LTC4401-2) RF Input Resistance 150 250 350 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. 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. TYPICAL PERFOR A CE CHARACTERISTICS PCTL REFERENCED DETECTOR OUTPUT VOLTAGE (mV) PCTL REFERENCED DETECTOR OUTPUT VOLTAGE (mV) PCTL REFERENCED DETECTOR OUTPUT VOLTAGE (mV) LTC4401-1 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) UW 14 LTC4401-1 Detector Characteristics at 1800MHz 10000 75°C 25°C –30°C LTC4401-1 Detector Characteristics at 2400MHz 10000 75°C 25°C –30°C 1000 1000 100 100 10 10 1 –26 –20 –14 –8 –2 4 10 RF INPUT POWER (dBm) 16 4401 G02 1 –24 –20 –16 –12 –8 –4 0 4 8 RF INPUT POWER (dBm) 12 16 4401 G03 4401 G01 4401fa 3 LTC4401-1/LTC4401-2 TYPICAL PERFOR A CE CHARACTERISTICS PCTL REFERENCED DETECTOR OUTPUT VOLTAGE (mV) PCTL REFERENCED DETECTOR OUTPUT VOLTAGE (mV) 10000 75°C 25°C –30°C 10000 PCTL REFERENCED DETECTOR OUTPUT VOLTAGE (mV) LTC4401-1 Detector Characteristics at 2700MHz 1000 100 10 1 –22 –18 –14 –10 –6 –2 2 6 RF INPUT POWER (dBm) PI FU CTIO S (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. GND (Pins 2/4): System Ground. 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. 4 UW LTC4401-2 Detector Characteristics at 900MHz 75°C 25°C –30°C LTC4401-2 Detector Characteristics at 1800MHz 10000 75°C 25°C –30°C 1000 1000 100 100 10 10 10 14 4401 G04 1 –28 –22 –16 –10 –4 2 8 RF INPUT POWER (dBm) 14 4401 G05 1 –26 –20 –14 –8 –2 4 10 RF INPUT POWER (dBm) 16 4401 G06 U U U 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. 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. 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. BSEL (Pin 7): (LTC4401-2 Only) Selects VPCA when Low and VPCB when High. This input has an internal 150k resistor to ground. 4401fa LTC4401-1/LTC4401-2 BLOCK DIAGRA 68Ω 33pF VCC 6 250Ω RF 1 28pF 30k 60µA GND 2 60µA VBG VREF W 30k (LTC4401-1) RF IN RF PA 50Ω Li-Ion TXENB AUTOZERO – AZ + + GAIN COMPRESSION – GM + + – 80mV 270kHz FILTER CLAMP + CC BUFFER 5 + RF DET 38k – 30k 30k VPCA – 22k 51k VREF + – 33.4k 6k 12Ω TXENB 10µs DELAY 150k LTC4401-1 4 SHDN 3 4401-1 BD CONTROL 100Ω PCTL 4401fa 5 LTC4401-1/LTC4401-2 BLOCK DIAGRA W + RF DET (LTC4401-2) DIPLEXER 68Ω 900MHZ 33pF VCC 1 RF PA 50Ω RF PA 1.8GHz/1.9GHz Li-Ion TXENB AUTOZERO – AZ + + GAIN COMPRESSION 250Ω RF 8 – GM BUF A CLAMP 2 + + – 30k 80mV 270kHz FILTER 38k VPCA + CC MUX1 MUX2 – 30k 30k 12Ω 28pF 30k 60µA GND 4 60µA – 22k 51k VREF + – BUF B 3 VPCB 33.4k 6k 100Ω TXENB VBG VREF 10µs DELAY 150k 150k CONTROL 12Ω VPCA 100Ω LTC4401-2 6 SHDN 5 PCTL 7 4401-2 BD BSEL 4401fa 6 LTC4401-1/LTC4401-2 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 U W U U 7 LTC4401-1/LTC4401-2 APPLICATIO S I FOR ATIO Enable: When SHDN is asserted high the part will automatically calibrate out all offsets. This takes 160mV 4401fa LTC4401-1/LTC4401-2 APPLICATIO S I FOR ATIO 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. 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. 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. CONTROL AMPLIFER RF POWER AMP VPC G1 G2 CONTROLLED RF OUTPUT POWER VOLTAGE GAIN (dB) + PCTL – IFB LTC4401-X H1 RF H2 4401 F04 RF DETECTOR DIRECTIONAL COUPLER 14dB to 20dB LOSS Figure 4. Closed-Loop Block Diagram U Linear Technology Corporation hereby grants the users of this model a nonexclusive, nontransferable license to use this model under the following conditions: 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 –60 100 180 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) 4401 F05 W UU PHASE (DEG) 1k Figure 5. SPICE Model Open-Loop Gain and Phase Characteristics from RF to VPCA, PCTL < 80mV 4401fa 11 LTC4401-1/LTC4401-2 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 U W UU LTC4401-1/LTC4401-2 APPLICATIO S I FOR ATIO PCTL RPCTL1 51E3 ND1 RFILT 44E3 ND2 ND3 + GM GIN1 RO1 20E6 86E-6 CC1 75E-12 + GM CPCTL1 13E-12 RPCTL2 38E3 C PCTL2 7E-12 – – RF RT 250Ω RSD 500Ω ND10 CP 28E-12 ND11 + GM GX5 RX5 1E6 1E-6 CX5 16E-15 + GM GX6 RX6 1E6 1E-6 CX6 1.2E-15 – – Figure 7. LTC4401-X Low Frequency AC Model U ND4 GX1 RX1 1E6 ND5 LX1 65E-3 ND6 ND7 ND8 W UU + GM GX2 RX2 1E6 1E-6 CX2 8E-15 + GM GX3 RX3 1E6 1E-6 CX3 32E-15 + GM GX4 RX4 1E6 1E-6 1E-6 – – – IFB ND8 2X BUFFER ND12 GXFB GM RFB1 22E3 33E-6 CFB1 2.4E-12 EX1 VAMP + – + – 2 R9 50Ω CLINT 5E-12 ND9 RLOAD 2E3 VPCA CLOAD 33E-12 4401 F07 4401fa 13 LTC4401-1/LTC4401-2 PACKAGE DESCRIPTIO 0.62 MAX 0.95 REF 3.85 MAX 2.62 REF RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR 0.20 BSC 1.00 MAX DATUM ‘A’ 0.30 – 0.50 REF 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 0.09 – 0.20 (NOTE 3) 14 U S6 Package 6-Lead Plastic TSOT-23 (Reference LTC DWG # 05-08-1636) 2.90 BSC (NOTE 4) 1.22 REF 1.4 MIN 2.80 BSC 1.50 – 1.75 (NOTE 4) PIN ONE ID 0.95 BSC 0.30 – 0.45 6 PLCS (NOTE 3) 0.80 – 0.90 0.01 – 0.10 1.90 BSC S6 TSOT-23 0302 4401fa LTC4401-1/LTC4401-2 PACKAGE DESCRIPTIO U MS8 Package 8-Lead Plastic MSOP (Reference LTC DWG # 05-08-1660) 0.889 ± 0.127 (.035 ± .005) 3.20 – 3.45 (.126 – .136) 0.65 (.0256) BSC 3.00 ± 0.102 (.118 ± .004) (NOTE 3) 8 7 65 0.52 (.0205) REF DETAIL “A” 0° – 6° TYP 4.90 ± 0.152 (.193 ± .006) 3.00 ± 0.102 (.118 ± .004) (NOTE 4) 0.53 ± 0.152 (.021 ± .006) DETAIL “A” 0.18 (.007) SEATING PLANE 0.22 – 0.38 (.009 – .015) TYP 0.127 ± 0.076 (.005 ± .003) MSOP (MS8) 0204 5.23 (.206) MIN 0.42 ± 0.038 (.0165 ± .0015) TYP RECOMMENDED SOLDER PAD LAYOUT 0.254 (.010) GAUGE PLANE 1 1.10 (.043) MAX 23 4 0.86 (.034) REF 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 0.65 (.0256) BSC 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 TYPICAL APPLICATION LTC4401-2 Dual Band Cellular Telephone Transmitter 68Ω 33pF RF VPCA VPCB PCTL 50Ω DAC 1.8GHz/ 1.9GHz RF PA 900MHz RF PA DIRECTIONAL COUPLER VIN Li-Ion SHDN BSEL 0.1µF RELATED PARTS PART NUMBER LTC1503 LTC1555L-1.8 LT 1615 LT1617 LTC1682 LTC1734 LT1761 LTC1878 LTC1911 LTC1928 LT1932 LT1944 LTC1986 LTC3200 LTC3202 LTC3401 LTC3402 LTC3404 LTC3405 LTC4400 LTC5505 ® DESCRIPTION Inductorless Step-Down DC/DC Converter SIM Power Supply and Level Translator Step-Up DC/DC Converter Inverting DC/DC Converter Low Noise Charge Pump with LDO SOT-23 Li-Ion Battery Charger Low Dropout, Low Noise Linear Regulator Step-Down DC/DC Converter Low Noise, Inductorless Buck Controller Low Noise Charge Pump White LED Driver Step-Up DC/DC Converter SIM Power Supply Low Noise Charge Pump Charge Pump for White LED Step-Up DC/DC Converter Step-Up DC/DC Converter Step-Down DC/DC Converter 1.5MHz, 250mA ThinSOT Buck Converter RF Power Controller in ThinSOT RF Power Detector in ThinSOT 16 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 q FAX: (408) 434-0507 q U LTC4401-2 VCC SHDN BSEL GND DIPLEXER 4401 TA03 COMMENTS 600kHz, Up to 100mA, 25% Higher Efficiency Than Linear Regulator Generates 1.8V, 3V or 5V; >10kV ESD on All SIM Contact Pins ThinSOT, Low 20µA Quiescent Current, VIN as Low as 1V, 300mA IOUT ThinSOT, Low 20µA Quiescent Current, VIN as Low as 1V, 300mA IOUT 60µVRMS Output Noise, Small MSOP Package Up to 700mA Charge Current, Only Two External Components ThinSOT, 300mV Dropout at 100mA, 20µVRMS Output Noise (10Hz to 100kHz) Integrated Synchronous Operation, Up to 95% Efficiency, 1A Switch Current. 2.7V ≤ VIN ≤ 5.5V, IOUT ≤ 250mA, 1.5MHz, 8-Pin MSOP ThinSOT, 90µVRMS Output Noise (100kHz BW), IOUT Up to 30mA ThinSOT, 1.2MHz DC/DC Constant-Current LED Driver, Dimming Control Dual Output for LCD Bias, Low Quiescent Current of 20µA, 1.2V ≤ VIN ≤ 15V ThinSOT, 3V and 5V, Ultralow Supply Current of 14µA, 40dB Dynamic Range, 300MHz to 3GHz, Buffered Detector Output 4401fa LT/TP 0204 1K REV A • PRINTED IN THE USA www.linear.com © LINEAR TECHNOLOGY CORPORATION 2001