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MAXIM New Products - MAX77178, MAX77179 & MAX15091, MAX15091A
2013-04-01
MAX77178, MAX77179
High-Bandwidth LTE/WCDMA PA Power Management ICs in a 1.75mm x 1.4mm, 0.4mm Pitch WLP
High Efficiency, Small Solution Size for Average Power Tracking of 3G/4G RF Power Amplifiers
Description
The MAX77178/MAX77179 step-down converters are optimized for powering the power amplifier (PA) in multimode/multiband handsets for 3G/4G applications such as LTE, WCDMA, as well as other RF PA applications such as Wi-Fi® and WiMAX®.
The 2.5V to 5.5V input supply range supports both current and future battery chemistries. The MAX77179 uses an analog input driven by an external DAC to control the output voltage linearly for continuous PA power adjustment. The output voltage range (0.5V to VIN) supports operation with a wide variety of PAs. The MAX77178 uses a 2-bit GPIO interface with four selectable output voltage options to control the output voltage supply for PA power adjustment.
Fast switching frequency (8MHz (typ)) allows the use of low value inductor and small ceramic output capacitors while maintaining low-ripple voltage. Efficiency is enhanced at light loads by switching to skip mode where the converter switches only as needed to service the load. Adaptive smart FET scaling further improves efficiency under all operating conditions.
Other features include overcurrent and overtemperature protection, and a very low-current (0.1µA (typ)) shutdown mode.
Key Features
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Meets 3G/4G Timing and RF Spectrum Mask Requirements
- 20µs (typ) Settling Time for 0.5V to 3.4V Output Voltage Change
- 30µs (typ) Settling from Enable to 95% Output Voltage Regulation
- Four Selectable Output Voltages with Logic Inputs (MAX77178 Only)
- Analog Controlled Output Voltage Settings from 0.5V to VIN(MAX77179 Only)
- 1A Peak Output Current Capability
- ±3% Output Voltage Accuracy
- Allows Use of Small (1210) 0.47µH Inductor
- 100% Duty-Cycle Operation
- Simple Logic On/Off Controls
- < 1µA Shutdown Supply Current
- 2.5V to 5.5V Supply Voltage Range
- Overcurrent and Overtemperature Protection
MAX15091, MAX15091A
2.7V to 18V, 9A, Integrated Hot-Swap Solution with Current Report Output
Smallest and Most Integrated Hot Swap for 12V Applications
Description
The MAX15091/MAX15091A ICs are integrated solutions for hot-swap applications requiring the safe insertion and removal of circuit line cards from a live backplane. The devices integrate a hot-swap controller, 18mΩ (typ) power MOSFET, and an electronic circuit-breaker protection in a single package.
The devices integrate an accurate current-sense circuitry and provide 170µA/A of proportional output current. The devices are designed for protection of 2.7V to 18V supply voltages.
These devices implement a foldback current limit during startup to control inrush current lowering di/dt and keep the MOSFET operating under safe operating area (SOA) conditions. After the startup cycle is complete, on-chip comparators provide VariableSpeed/BiLevel™ protection against short-circuit and overcurrent faults, and immunity against system noise and load transients. The load is disconnected in the event of a fault condition. The devices are factory calibrated to deliver accurate overcurrent protection with ±10% accuracy. During a fault condition, the MAX15091 latches off, while the MAX15091A enters autoretry mode.
The devices feature an IN to OUT short-circuit detection before startup. The devices provide a power-MOSFET GATE pin to program the slew rate during startup by adding an external capacitor. The devices have overvoltage/undervoltage input pins that can detect an overvoltage/undervoltage fault and disconnect the IN from the OUT. Additional features include internal overtemperature protection, power-good output, and fault-indicator output.
The MAX15091/MAX15091A are available in a 28-pin, 5mm × 5mm TQFN power package and are rated over the -40°C to +85°C extended temperature range.
The devices integrate an accurate current-sense circuitry and provide 170µA/A of proportional output current. The devices are designed for protection of 2.7V to 18V supply voltages.
These devices implement a foldback current limit during startup to control inrush current lowering di/dt and keep the MOSFET operating under safe operating area (SOA) conditions. After the startup cycle is complete, on-chip comparators provide VariableSpeed/BiLevel™ protection against short-circuit and overcurrent faults, and immunity against system noise and load transients. The load is disconnected in the event of a fault condition. The devices are factory calibrated to deliver accurate overcurrent protection with ±10% accuracy. During a fault condition, the MAX15091 latches off, while the MAX15091A enters autoretry mode.
The devices feature an IN to OUT short-circuit detection before startup. The devices provide a power-MOSFET GATE pin to program the slew rate during startup by adding an external capacitor. The devices have overvoltage/undervoltage input pins that can detect an overvoltage/undervoltage fault and disconnect the IN from the OUT. Additional features include internal overtemperature protection, power-good output, and fault-indicator output.
The MAX15091/MAX15091A are available in a 28-pin, 5mm × 5mm TQFN power package and are rated over the -40°C to +85°C extended temperature range.
Key Features
- 2.7V to 18V Operating Voltage Range
- 18mΩ Internal Power MOSFET
- 9A (typ) Load Current Capability
- Analog Current Report Output
- ±10% Circuit-Breaker Threshold Accuracy
- Programmable Inrush Current Control Under SOA Operation
- Adjustable Circuit-Breaker Current/Current-Limit Threshold
- Programmable Slew-Rate Control
- Variable-Speed Circuit-Breaker Response
- Thermal Protection
- Overvoltage Protection
- Power-Good and Fault Outputs
- Latch-Off or Automatic Retry Options
- Programmable Undervoltage Lockout
- IN to OUT Short-Circuit Detection
