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MAXIM New Products - MAX17503 & MAX16990EVKIT, MAX16992EVKIT
2013-10-16
MAX17503
4.5V-60V, 2.5A, High-Efficiency, Synchronous Step-Down DC-DC Converter with Internal Compensation
Industry's Only 60V, 2.5A Internal FET Synchronous Buck Converter
Description
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The MAX17503 high-efficiency, high-voltage, synchronously rectified step-down converter with dual integrated MOSFETs operates over a 4.5V to 60V input. It delivers up to 2.5A and 0.9V to 90%VIN output voltage. Built-in compensation across the output voltage range eliminates the need for external components. The feedback (FB) regulation accuracy over -40°C to +125°C is ±1.1%. The device is available in a compact (4mm x 4mm) TQFN lead(Pb)-free package with an exposed pad. Simulation models are available.
The device features a peak-current-mode control architecture with a MODE feature that can be used to operate the device in pulse-width modulation (PWM), pulse-frequency modulation (PFM), or discontinuous-conduction mode (DCM) control schemes. PWM operation provides constant frequency operation at all loads, and is useful in applications sensitive to switching frequency. PFM operation disables negative inductor current and additionally skips pulses at light loads for high efficiency. DCM features constant frequency operation down to lighter loads than PFM mode, by not skipping pulses but only disabling negative inductor current at light loads. DCM operation offers efficiency performance that lies between PWM and PFM modes. The low-resistance, on-chip MOSFETs ensure high efficiency at full load and simplify the layout.
A programmable soft-start feature allows users to reduce input inrush current. The device also incorporates an output enable/undervoltage lockout pin (EN/UVLO) that allows the user to turn on the part at the desired input-voltage level. An open-drain active-low RESET pin provides a delayed power-good signal to the system upon achieving successful regulation of the output voltage.
The MAX17503 high-efficiency, high-voltage, synchronously rectified step-down converter with dual integrated MOSFETs operates over a 4.5V to 60V input. It delivers up to 2.5A and 0.9V to 90%VIN output voltage. Built-in compensation across the output voltage range eliminates the need for external components. The feedback (FB) regulation accuracy over -40°C to +125°C is ±1.1%. The device is available in a compact (4mm x 4mm) TQFN lead(Pb)-free package with an exposed pad. Simulation models are available.
The device features a peak-current-mode control architecture with a MODE feature that can be used to operate the device in pulse-width modulation (PWM), pulse-frequency modulation (PFM), or discontinuous-conduction mode (DCM) control schemes. PWM operation provides constant frequency operation at all loads, and is useful in applications sensitive to switching frequency. PFM operation disables negative inductor current and additionally skips pulses at light loads for high efficiency. DCM features constant frequency operation down to lighter loads than PFM mode, by not skipping pulses but only disabling negative inductor current at light loads. DCM operation offers efficiency performance that lies between PWM and PFM modes. The low-resistance, on-chip MOSFETs ensure high efficiency at full load and simplify the layout.
A programmable soft-start feature allows users to reduce input inrush current. The device also incorporates an output enable/undervoltage lockout pin (EN/UVLO) that allows the user to turn on the part at the desired input-voltage level. An open-drain active-low RESET pin provides a delayed power-good signal to the system upon achieving successful regulation of the output voltage.
Key Features
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Eliminates External Components and Reduces Total Cost
- No Schottky-Synchronous Operation for High Efficiency and Reduced Cost
- Internal Compensation for Stable Operation at Any Output Voltage
- All-Ceramic Capacitor Solution: Ultra-Compact Layout with as Few as Eight External Components
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Reduces Number of DC-DC Regulators to Stock
- Wide 4.5V to 60V Input Voltage Range
- 0.9V to 90%VIN Output Voltage
- Delivers Up to 2.5A Over Temperature
- 200kHz to 2.2MHz Adjustable Frequency with External Synchronization
- Available in a 20-Pin, 4mm x 4mm TQFN Package
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Reduces Power Dissipation
- Peak Efficiency > 90%
- PFM and DCM Modes for High Light-Load Efficiency
- Shutdown Current = 2.8µA (typ)
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Operates Reliably
- Hiccup-Mode Current Limit and Autoretry Startup
- Built-In Output-Voltage Monitoring (Open-Drain Active-Low RESET Pin)
- Resistor-Programmable EN/UVLO Threshold
- Adjustable Soft-Start and Prebiased Power-Up
- -40°C to +125°C Operation
MAX16990EVKIT, MAX16992EVKIT
Evaluation Kits for the MAX16990 and MAX16992
Description
The MAX16990/MAX16992 evaluation kits (EV kits) are fully assembled and tested PCBs that contain a 16W DC-DC converter for front-end preboost automotive applications. The devices integrate a low-side FET driver and current-mode control-loop circuitry for output-voltage regulation, making them ideal for automotive boost or SEPIC converters. The MAX16990 integrated driver switches at 400kHz, while the MAX16992 integrated driver switches at 2.2MHz using the default configuration. The MAX16990 can be synchronized with an external clock source within the 100kHz to 1MHz range, and the MAX16992 within the 1MHz to 2.5MHz range.
The EV kits operate from a DC supply voltage of 4.5V (3V in bootstrapped mode) up to 36V. The EV kits can withstand a 42V load-dump condition for up to 400ms. Each EV kit demonstrates the device features, such as dynamic adjustable output voltage, external clock synchronization, two-phase operation configurability, cycle-by-cycle current limit, hiccup mode, and thermal shutdown. The boost converter regulates 8V and can supply a current up to 2A. Each EV kit includes an external p-MOSFET (P1) that can be used to disconnect the boost output from the load in a fault condition. The EV kits also demonstrate a reference MAX16990 design for automotive
Key Features
- 4.5V (3V in Bootstrapped Mode) Up to 36V Input Voltage Range
- 8V Up to 2A Output
- Demonstrates External Clock Synchronization
- Demonstrates SUP UVLO
- Demonstrates Cycle-by-Cycle Current Limit and Hiccup Mode
- Thermal-Shutdown Protection
- PGOOD Flag
- Demonstrates Dynamic Adjustable Output
- Switched Output Option
- Demonstrates Two Phases of Operation
- Proven PCB Layout and Thermal Design
- Fully Assembled and Tested
