MAX17501A

Part: MAX17501ATB+ — Maxim Integrated

Type: Synchronous Step-Down DC-DC Converter

Description: 4.5–60 V input, 500 mA synchronous step-down converter with integrated MOSFETs, fixed 3.3 V/5 V or adjustable (0.9 V to 92% VIN) output, and >90% peak efficiency in a 3 mm x 2 mm TDFN package.

Operating Conditions:

• Supply voltage: 4.5–60 V
• Operating temperature: -40 to +125 °C (ambient)
• Output voltage: 0.9 V to 92% VIN (adjustable); fixed 3.3 V or 5 V options
• Switching frequency: 600 kHz or 300 kHz options

Absolute Maximum Ratings:

• VIN to GND: -0.3 V to +70 V
• EN/UVLO and LX to PGND: -0.3 V to (VIN + 0.3 V)
• LX total RMS current: ±1.6 A
• Junction temperature: +150 °C
• Storage temperature: -65 to +160 °C

Key Specs:

• Input voltage range: 4.5–60 V
• Shutdown supply current: 0.9 μA typ, 3.5 μA max (VEN = 0 V)
• Switching-mode no-load supply current: 4.75 mA typ (MAX17501E/F/G), 2.5 mA typ (MAX17501H)
• Feedback regulation voltage (G/H): 0.9 V typ (0.884–0.916 V)
• Fixed output accuracy: MAX17501E 3.3 V (3.248–3.352 V); MAX17501F 5 V (4.922–5.08 V)
• High-side pMOS RDS(on): 0.55 Ω typ, 0.85 Ω max (25 °C, 0.5 A)
• Low-side nMOS RDS(on): 0.2 Ω typ, 0.35 Ω max (25 °C, 0.5 A)
• Peak current limit: 0.76 A typ (0.64–0.86 A)
• Switching frequency: 600 kHz typ (A/B/E/F/G), 300 kHz typ (H)
• Thermal shutdown: 165 °C, 10 °C hysteresis

Features:

• Peak-current-mode control with PFM or forced-PWM options
• Integrated high-side and low-side MOSFETs (no Schottky diode required)
• Internal compensation and feedback divider for fixed 3.3 V and 5 V outputs
• Programmable soft-start and prebiased power-up
• Resistor-programmable EN/UVLO threshold
• Open-drain RESET pin with delayed power-good signal
• Hiccup-mode current limit, sink current limit, and autoretry startup
• All-ceramic capacitor operation
• -40 to +150 °C junction temperature range

Applications:

• Industrial process control
• HVAC and building control
• Base station, VOIP, telecom
• Home theatre
• Battery-powered equipment
• General-purpose point-of-load

Package:

• 10-pin TDFN, 3 mm x 2 mm

The MAX17501 high-efficiency, high-voltage, synchro nous step-down DC-DC converter with integrated MOSFETs operates over a 4.5V to 60V input voltage range. This device is offered in a fixed 3.3V, 5V, or adjustable output voltage (0.9V to 92%V IN ) while delivering up to 500mA of current. The output voltage is accurate to within ±1.7% over -40°C to +125°C. The MAX17501 is available in a compact TDFN package. Simulation models are available.

The device features peak-current-mode control with pulse-width modulation (PWM). Users can choose devices with either pulse frequency modulation (PFM) or forced PWM scheme. PFM devices skip pulses at light load for higher efficiency, while forced-PWM devices operate with fixed switching frequency at any load for noise sensitiveapplications. 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 inputvoltage level. An open-drain RESET pin provides a delayed power-good signal to the system upon achieving successful regulation of the output voltage.

• Industrial Process Control
• HVAC and Building Control
• Base Station, VOIP, Telecom
• Home Theatre
• Battery-Powered Equipment
• General-Purpose Point-of-Load
• Eliminates External Components and Reduce Total Cost
• No Schottky-Synchronous Operation for High Efficiency and Reduced Cost
• Internal Compensation and Feedback Divider for 3.3V and 5V Fixed Outputs
• All-Ceramic Capacitors, Ultra-Compact Layout
• Reduces Number of DC-DC Regulators to Stock
• Wide 4.5V to 60V Input Voltage Range
• 0.9V to 92%V IN Adjustable Output Voltage
• Delivers Up to 500mA
• 600kHz and 300kHz Switching Frequency Options
• Available in a 10-Pin, 3mm x 2mm TDFN Package
• Reduces Power Dissipation
• Peak Efficiency > 90%
• PFM Feature for High Light-Load Efficiency
• Shutdown Current = 0.9μA (typ)
• Operates Reliably in Adverse Industrial Environments
• Hiccup-Mode Current Limit, Sink Current Limit, and Autoretry Startup
• Built-In Output-Voltage Monitoring (Open-Drain RESET Pin)
• Resistor-Programmable EN/UVLO Threshold
• Adjustable Soft-Start and Prebiased Power-Up
• High Industrial -40°C to +125°C Ambient Operating Temperature Range/-40°C to +150°C Junction Temperature Range

Ordering Information/Selector Guide appears at end of data sheet.

(V IN = 24V, V GND = V PGND = 0V, C VIN = C VCC = 1μF, V EN = 1.5V, C SS = 3300pF, V FB = 0.98 x V OUT , LX = unconnected, RESET = unconnected. T A = -40°C to +125°C, unless otherwise noted. Typical values are at T A = +25°C. All voltages are referenced to GND, unless otherwise noted.) (Note 2)

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Stresses beyond those listed under 'Absolute Maximum Ratings' may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Junction temperature greater than +125°C degrades operating lifetimes.

Thermal-overload protection limits total power dissipa tion in the device. When the junction temperature of the device exceeds +165°C, an on-chip thermal sensor shuts down the device, allowing the device to cool. The thermal sensor turns the device on again after the junc tion temperature cools by 10°C. Soft-start resets during thermal shutdown. Carefully evaluate the total power dissipation (see the Power Dissipation section) to avoid unwanted triggering of the thermal-overload protection in normal operation.

Figure 6. MAX17501A/E Application Circuit (3.3V Output, 500mA Maximum Load Current, 600kHz Switching Frequency)

Figure 7. MAX17501B/F Application Circuit (5V Output, 500mA Maximum Load Current, 600kHz Switching Frequency)

Figure 6. MAX17501A/E Application Circuit (3.3V Output, 500mA Maximum Load Current, 600kHz Switching Frequency)

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Figure 8. MAX17501G Application Circuit (12V Output, 500mA Maximum Load Current, 600kHz Switching Frequency)

Figure 9. MAX17501H Application Circuit (2.5V Output, 500mA Maximum Load Current, 300kHz Switching Frequency)

Figure 8. MAX17501G Application Circuit (12V Output, 500mA Maximum Load Current, 600kHz Switching Frequency)

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For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages . Note that a '+', '#', or '-' in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.

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