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MC33170 RF Amplifier Companion Chip for Dual-Band Cellular Subscriber Terminal
The MC33170 is a complete solution for drain modulated dual–band GSM 900MHz and DCS–1800MHz Power Amplifiers. Thanks to its internal decoder, the MC33170 drastically simplifies the interface between the PAs and the baseband logic section, providing an immediate gain in part count but also in occupied copper area. The device is also ready for 1V platforms since it accepts logic high control signals down to 900mV@25°C. A priority management system ensures the negative is present before authorizing the power modulation, giving the necessary ruggedness to the final design. This function can easily be disabled for PAs not requiring a negative bias. The device is able to directly drive an external P or N–channel with the possibility to linearize the overall response via the internal high–performance control amplifier and easily implement system gain. Finally, an LDO delivers a stable voltage, usable for external biasing purposes.
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TSSOP–14 DTB SUFFIX CASE 948G
PIN CONNECTIONS
Band Selection Tx Enable GSM-900 1 2 3 14 Common Enable
13 Negative Regulator 12 Out 11 Vboost 10 INV 9 8 NINV LDO
DCS-1800 4 PA Start-up Gnd Vbat 5 6 7
• 1V platform compatible: ON voltage = 900mV, OFF voltage = • • • • •
300mV max Priority management system prevents power modulation before negative bias establishes High performance 4.5MHz gain–bandwidth product operational amplifier Drives N or P–channel MOSFET 2.5V low–noise LDO Idle mode input for very low power consumption (standby mode)
(Top View) ORDERING INFORMATION
Device MC33170DTB Package TSSOP–14 Shipping 96 Units / Rail
MC33170DTBR2 TSSOP–14 2500 / Tape & Reel NINV 9 Shutdown 2.5 V Low Dropout 2.5 V Vbat Vboost Vbat (5.5 V Max) 11 7
Shutdown LDO Output Common Enable TX Enable Band Selection 2.5 V 8 + 14 2 1 Open–Collector BG Decoder BD B′G 1 mA Continuous 3 GSM–900 4 700 mA Peak 50 mA Continuous Clip to –5 V 13 10 6 12 Out -
NEGOK? 5
DCS–1800
PA Start–Up
Negative INV Regulator
© Semiconductor Components Industries, LLC, 2001
1
May, 2001 – Rev. 1
Publication Order Number: MC33170/D
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PIN DESCRIPTION
Pin No. 1 2 3 4 5 6 7 8 9 Pin Name Function Description Band Selection Tx Enable Selects the transmit band Starts the power A level high on this input selects the DCS chain. A zero selects the GSM chain. A level high on this pin enables the DCS/GSM chain and establishes a low–resistance link between pin 5 and 7 GSM–900 Biases the 900MHz section Biases the 1.8GHz section When pin 1 is at zero and pin 2 goes high, the LDO voltage appears on this pin (pin 14 is high) When pin 1 is at one and pin 2 goes high, the LDO voltage appears on this pin (pin 14 is high) When pin 2 goes high, the battery voltage appears on this pin with a 700mA peak current capability (pin 14 is high) The IC ground DCS–1800 PA Start–up Gnd Enables the PA power section The IC ground Vbat The IC power supply This pin is wired to the battery terminal. A 100nF decoupling capacitor is recommended, depending on the supply impedance This output requires a 100nF decoupling and is able to deliver up to 10mA continuous The non–inverting OPAMP input The inverting OPAMP input LDO Low DropOut regulator Positive OPAMP input NINV INV 10 11 Negative OPAMP input Vboost Out Boost voltage from the PA The OPAMP output This pin connects to a boost voltage delivered by the RF PA. This boost is necessary when driving an N–channel The output of the OPAMP/MOSFET driver pin 12 13 Negative Reg. The PA negative clip This pin clips the PA negative bias to —5V and prevents/authorizes the modulation depending on its typical level : <5.5V ––– 2.5V> OK <1.3V ––– –3.5V> NOTOK <–4.2V ––– –5V> OK Max. clipping current is 5mA When high, this pin puts the IC in on–mode 14 Common Enable Enables the whole IC
MC33170
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