LMZ36002RKGT

Part: LMZ36002, Texas Instruments

Type: 2-A Power Module

Key Specs:

• Input Voltage: 4.5 V to 60 V
• Output Current: 2 A
• Output Voltage Adjust: 2.5 V to 7.5 V
• Adjustable Switching Frequency: 200 kHz to 1 MHz
• Operating Temperature Range: –40°C to 105°C
• Enhanced Thermal Performance: 14°C/W

Features:

• Complete Integrated Power Solution Allows Small Footprint, Low-Profile Design
• Synchronizes to an External Clock
• Automatic PFM Mode for Light Load Efficiency
• Adjustable Soft-Start Time
• Output Voltage Sequencing / Tracking
• Power-Good Output
• Programmable Undervoltage Lockout (UVLO)
• Overtemperature Thermal Shutdown Protection
• Overcurrent Protection (Hiccup Mode)
• Prebias Output Start-Up
• Meets EN55022 Class B Emissions – Integrated Shielded Inductor

Applications:

• Industrial and Motor Controls
• Automated Test Equipment
• Medical and Imaging Equipment
• High Density Power Systems

Package:

• QFN: 10 mm × 10 mm × 4.3 mm

• ¹ Complete Integrated Power Solution Allows Small Footprint, Low-Profile Design
• 10 mm × 10 mm × 4.3 mm Package
• Wide-Output Voltage Adjust (2.5 V to 7.5 V)
• • Adjustable Switching Frequency (200 kHz to 1 MHz)
• Synchronizes to an External Clock
• Automatic PFM Mode for Light Load Efficiency
• Adjustable Soft-Start Time
• Output Voltage Sequencing / Tracking
• Power-Good Output
• Programmable Undervoltage Lockout (UVLO)
• Overtemperature Thermal Shutdown Protection
• Overcurrent Protection (Hiccup Mode)
• Prebias Output Start-Up

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• Operating Temperature Range: –40°C to 105°C
• • Enhanced Thermal Performance: 14°C/W
• Meets EN55022 Class B Emissions – Integrated Shielded Inductor
• • Create a Custom Design using the LMZ36002 with the WEBENCH® Power Designer

• Industrial and Motor Controls
• Automated Test Equipment
• Medical and Imaging Equipment
• High Density Power Systems

Pin Functions

• NAME
• AGND
• CLK
• DNC
• INH/UVLO
• PGND
• PH
• PVIN
• PWRGD

(1) G = Ground, I = Input, O = Output

LMZ36002 SNVSA92D –SEPTEMBER 2015–REVISED JUNE 2018 www.ti.com

Pin Functions (continued)

LMZ36002 www.ti.com SNVSA92D –SEPTEMBER 2015–REVISED JUNE 2018

6 Specifications

6.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted)(1)

(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

(2) The maximum voltage that can be applied to these pins is 30 V or PVIN, whichever is less.

(3) See temperature derating curves in the Typical Characteristics section for thermal information.

(4) For soldering specifications, refer to the Soldering Requirements for BQFN Packages application note.

(5) Devices with a date code prior to week 14 2018 (1814) have a peak reflow case temperature of 240°C with a maximum of one reflow

6.2 ESD Ratings

(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.

6.3 Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted)

6.4 Thermal Information

LMZ36002

SNVSA92D –SEPTEMBER 2015–REVISED JUNE 2018 www.ti.com

6.5 Electrical Characteristics

Over -40°C to +105°C free-air temperature, PVIN = 24 V, VOUT = 5 V, IOUT = IOUT(max), ƒsw = 500 kHz, CIN1 = 1 × 10-μF, 100-V 1210 ceramic, CIN2 = 1 × 100-μF 100-V electrolytic bulk, and COUT = 3 × 47-μF, 16-V 1210 ceramic (unless otherwise noted).

(2) The stated limit of the set-point voltage tolerance includes the tolerance of both the internal voltage reference and the internal adjustment resistor. The overall output voltage tolerance is affected by the tolerance of the external RSET resistor.

(3) Specified by design. Not production tested.

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Electrical Characteristics (continued)

Over -40°C to +105°C free-air temperature, PVIN = 24 V, VOUT = 5 V, IOUT = IOUT(max), ƒsw = 500 kHz, CIN1 = 1 × 10-μF, 100-V 1210 ceramic, CIN2 = 1 × 100-μF 100-V electrolytic bulk, and COUT = 3 × 47-μF, 16-V 1210 ceramic (unless otherwise noted).

(5) The amount of required output capacitance varies depending on the output voltage (see Output Capacitor Selection ). The minimum required output capacitance must be comprised of ceramic capacitance. The amount of required ceramic capacitance represents the standard capacitance value. Locate the capacitance close to the device. Adding additional ceramic or non-ceramic capacitance close to the load improves the response of the regulator to load transients.

(6) The maximum allowable output capacitance varies depending on the output voltage (see Output Capacitor Selection ).

6.6 Switching Characteristics

over operating free-air temperature range (unless otherwise noted)

SNVSA92D –SEPTEMBER 2015–REVISED JUNE 2018 www.ti.com

6.7 Typical Characteristics

T^A = 25°C, unless otherwise noted.

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6.8 Typical Characteristics

T^A = 25°C, unless otherwise noted.

LMZ36002

SNVSA92D –SEPTEMBER 2015–REVISED JUNE 2018 www.ti.com

6.9 Typical Characteristics

T^A = 25°C, unless otherwise noted.

Submit Documentation Feedback Copyright © 2015–2018, Texas Instruments Incorporated

6.10 Typical Characteristics (Thermal Derating)

The temperature derating curves represent the conditions at which internal components are at or below the manufacturer's maximum operating temperatures. Derating limits apply to devices soldered directly to a 50 mm × 100 mm, 4-layer PCB with 2 oz. copper.

7 Detailed Description

7.1 Overview

The LMZ36002 is a full featured 60-V input, 2-A, synchronous step down converter with PWM, MOSFETs, inductor, and control circuitry integrated into a low-profile, overmolded package. This device enables small designs by integrating all but the input and output capacitors, while still leaving the ability to adjust key parameters to meet specific design requirements. The LMZ36002 provides a 3× output voltage range of 2.5 V to 7.5 V. A single external resistor is used to adjust the output voltage to the desired output. The switching frequency is also adjustable by using an external resistor or a synchronization pulse to accommodate various input and output voltage conditions and to optimize efficiency. The device provides accurate voltage regulation for a variety of loads by using an internal voltage reference that is 2% accurate over temperature. Input undervoltage lockout is internally set at 3.2 V, but can be adjusted upward using a resistor divider on the INH/UVLO pin of the device. The INH/UVLO pin can also be pulled low to put the device in standby mode to reduce input quiescent current. The device provides a power good signal to indicate when the output is within ±5% of its nominal voltage. Thermal shutdown and current limit features protect the device during an overload condition. Automatic PFM mode improves light-load efficiency. A 43-pin, QFN, package that includes exposed bottom pads provides a thermally enhanced solution for space-constrained applications.

7.2 Functional Block Diagram

7.3 Feature Description

7.3.1 Adjusting the Output Voltage

The VADJ pin sets the output voltage of the LMZ36002. The output voltage adjustment range is from 2.5 V to 7.5 V. The switching frequency range for any output voltage must be determined from Table 4 or Table 5. The adjustment method requires the addition of RSET, which sets the output voltage, and the connection of SENSE+ to VOUT. The RSET resistor must be connected directly between the VADJ (pin 24) and AGND. The SENSE+ pin (pin 22) must be connected to VOUT either at the load for improved regulation or at VOUT of the device. Table 1 lists the standard external RSET resistor for a number of common bus voltages.

Table 1. Standard RSET Resistor Values for Common Output Voltages

$mathcal{R}_mathsf{SET} = frac{mathbf{20}}{≤ft[ ≤ft( frac{mathsf{V}_mathsf{OUT}}{mathbf{1}.mathsf{O} mathbf{1}} right) - mathbf{1} right]} (kΩtext{)}(1)

Table 2. Standard RSET Resistor Values

• VOUT (V) RSET (kΩ) VOUT (V) RSET (kΩ)
• 2.5 13.7 5.1 4.99
• 2.6 12.7 5.2 4.87
• 2.7 11.8 5.3 4.75
• 2.8 11.3 5.4 4.64
• 2.9 10.7 5.5 4.53
• 3.0 10.2 5.6 4.42
• 3.1 9.76 5.7 4.32
• 3.2 9.31 5.8 4.22
• 3.3 8.87 5.9 4.12
• 3.4 8.45 6.0 4.02
• 3.5 8.06 6.1 3.97
• 3.6 7.87 6.2 3.92
• 3.7 7.50 6.3 3.83
• 3.8 7.32 6.4 3.74
• 3.9 6.98 6.5 3.65
• 4.0 6.81 6.6 3.61
• 4.1 6.49 6.7 3.57
• 4.2 6.34 6.8 3.48
• 4.3 6.19 6.9 3.40
• 4.4 5.90 7.0 3.36
• 4.5 5.76 7.1 3.32
• 4.6 5.62 7.2 3.24
• 4.7 5.49 7.3 3.20
• 4.8 5.36 7.4 3.16
• 4.9 5.23 7.5 3.09
• 5.0 5.11

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7.3.3 Recommended Operating Range

Table 4 and Table 5 below show the allowable switching frequencies for a given range of output voltages. Reference Table 4 for applications where the maximum output current is 1.75 A or less. Reference Table 5 for applications that the output current is greater than 1.75 A. Notice that applications requiring less than 1.75 A can operate over a much wider range of switching frequencies. For the most efficient solution, always operate at the lowest allowable frequency.

Table 4. Switching Frequency vs Output Voltage Output Current ≤ 1.75 A

Table 5. Switching Frequency vs Output Voltage Output Current > 1.75 A

Over -40°C to +105°C free-air temperature, PVIN = 24 V, VOUT = 5 V, IOUT = IOUT(max), ƒsw = 500 kHz, CIN1 = 1 × 10-μF, 100-V 1210 ceramic, CIN2 = 1 × 100-μF 100-V electrolytic bulk, and COUT = 3 × 47-μF, 16-V 1210 ceramic (unless otherwise noted).

(2) The stated limit of the set-point voltage tolerance includes the tolerance of both the internal voltage reference and the internal adjustment resistor. The overall output voltage tolerance is affected by the tolerance of the external RSET resistor.

(3) Specified by design. Not production tested.

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over operating free-air temperature range (unless otherwise noted)(1)

(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

(2) The maximum voltage that can be applied to these pins is 30 V or PVIN, whichever is less.

(3) See temperature derating curves in the Typical Characteristics section for thermal information.

(4) For soldering specifications, refer to the Soldering Requirements for BQFN Packages application note.

(5) Devices with a date code prior to week 14 2018 (1814) have a peak reflow case temperature of 240°C with a maximum of one reflow

over operating free-air temperature range (unless otherwise noted)

LMZ36002

SNVSA92D –SEPTEMBER 2015–REVISED JUNE 2018 www.ti.com

6.5 Electrical Characteristics

Over -40°C to +105°C free-air temperature, PVIN = 24 V, VOUT = 5 V, IOUT = IOUT(max), ƒsw = 500 kHz, CIN1 = 1 × 10-μF, 100-V 1210 ceramic, CIN2 = 1 × 100-μF 100-V electrolytic bulk, and COUT = 3 × 47-μF, 16-V 1210 ceramic (unless otherwise noted).

(2) The stated limit of the set-point voltage tolerance includes the tolerance of both the internal voltage reference and the internal adjustment resistor. The overall output voltage tolerance is affected by the tolerance of the external RSET resistor.

(3) Specified by design. Not production tested.

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