LMR62014

Part: LMR62014 — Texas Instruments

Type: Step-Up Voltage Regulator (Boost Converter)

Description: A 2.7–14 V input, 1.4 A step-up voltage regulator operating at 1.6 MHz, capable of boosting to voltages up to 20 V, provided in a 5-pin SOT-23 package.

Operating Conditions:

• Supply voltage: 2.7–14 V
• Operating junction temperature: -40°C to +125°C
• Output voltage: Up to 20 V
• Switching frequency: 1.6 MHz

Absolute Maximum Ratings:

• Max supply voltage: +14.5 V
• Max SW pin voltage: +22 V
• Max storage temperature: +150°C

Key Specs:

• Switch Current Limit: 1.4 A (min, over full operating temp range)
• Switch ON Resistance: 260 mΩ (typ, I_SW = 100 mA, V_IN = 5V)
• Feedback Pin Reference Voltage: 1.23 V (typ, V_IN = 3V)
• Quiescent Current (Not Switching): 0.024 μA (typ, V_SHDN = 0)
• Switching Frequency: 1.6 MHz (typ)
• Maximum Duty Cycle: 93 % (typ)
• Shutdown Threshold (Device ON): 1.5 V (min)

Features:

• Input Voltage Range of 2.7V to 14V
• Output Voltage up to 20V
• Switch Current up to 1.4A
• 1.6 MHz Switching Frequency
• Low Shutdown Iq, <1 μA
• Cycle-by-Cycle Current Limiting
• Internally Compensated
• 5-Pin SOT-23 Packaging
• Fully Enabled for WEBENCH Power Designer

Applications:

• Boost Conversions from 3.3V, 5V, and 12V Rails
• Space Constrained Applications
• Embedded Systems
• LCD Displays
• LED Applications

Package:

• SOT-23-5 (2.92 x 2.84 x 1.08mm)

• 23 · Input Voltage Range of 2.7V to 14V
• Output Voltage up to 20V
• Switch Current up to 1.4A
• 1.6 MHz Switching Frequency
• Low Shutdown Iq, <1 μA
• Cycle-by-Cycle Current Limiting
• Internally Compensated
• 5-Pin SOT-23 Packaging (2.92 x 2.84 x 1.08mm)
• Fully Enabled for WEBENCH ® Power Designer

• Boost Conversions from 3.3V, 5V, and 12V Rails
• Space Constrained Applications
• Embedded Systems
• LCD Displays
• LED Applications

Limits in standard typeface are for T J = 25°C, and limits in boldface type apply over the full operating temperature range ( -40°C ≤ TJ ≤ +125°C). Unless otherwise specified: VIN = 5V, VSHDN = 5V, I L = 0A.

• (1) Limits are ensured by testing, statistical correlation, or design.

(2) Typical values are derived from the mean value of a large quantity of samples tested during characterization and represent the most likely expected value of the parameter at room temperature.

• (3) L = 10 μH, COUT = 4.7 μF, duty cycle = maximum
• (4) Switch current limit is dependent on duty cycle (see Typical Performance Characteristics).
• (5) Specified limits are the same for Vin = 3.3V input.

formula: If power dissipation exceeds the maximum specified above, the internal thermal protection circuitry will protect the device by reducing the output voltage as required to maintain a safe junction temperature.

• (4) The human body model is a 100 pF capacitor discharged through a 1.5 k Ω resistor into each pin.

At higher duty cycles, the increased ON time of the FET means the maximum output current will be determined by power dissipation within the LMR62014 FET switch. The switch power dissipation from ON-state conduction is calculated by:P _ { ( S W ) } = D C × I _ { text {ND} } ( A V E ) ^ { 2 } × R _ { text {DS} } ( text {ON} )

There will be some switching losses as well, so some derating needs to be applied when calculating IC power dissipation.