TPS56A37
The TPS56A37 is an electronic component from Texas Instruments. View the full TPS56A37 datasheet below including electrical characteristics, absolute maximum ratings.
Manufacturer
Texas Instruments
Category
Integrated CircuitsOverview
Part: TPS56A37 — Texas Instruments
Type: Synchronous Buck Converter
Description: The TPS56A37 is a high-efficiency, easy-to-use synchronous buck converter with a 4.5V to 28V input voltage range, supporting up to 10A continuous output current and featuring D-CAP3 control mode for fast transient response.
Operating Conditions:
- Supply voltage: 4.5V–28V
- Operating junction temperature: -40°C to +150°C
- Output voltage range: 0.6V to 13V
- Max continuous output current: 10A
Absolute Maximum Ratings:
- Max supply voltage (VIN): 32 V
- Max SW voltage: 32 V (35 V <10ns transient)
- Max junction/storage temperature: 150 °C
Key Specs:
- Quiescent current (IQ): 45 μA (TJ = 25°C, non-switching)
- Feedback voltage (VFB): 0.591V to 0.609V (TJ = -40°C to 150°C)
- High-side MOSFET on-resistance (Rdson_HS): 19.4 mΩ (TJ = 25°C)
- Low-side MOSFET on-resistance (Rdson_LS): 8.5 mΩ (TJ = 25°C)
- Low-side MOSFET valley current limit (ILS_OCL): 10 A (min)
- Switching frequency (FSW): 500 kHz (VIN = 24V, VOUT = 5V)
- Internal soft-start time (tSS): 1.8 ms (default)
- Thermal shutdown threshold: 165 °C
Features:
- D-CAP3™ control mode for fast transient response
- Eco-mode (auto-skip mode) for high light-load efficiency
- Fixed 500kHz switching frequency
- Cycle by cycle over current limit
- Adjustable soft-start time with default 1.8ms
- Built-in output discharge function
- Power-good indicator
- Non-latched protections for UV, OV, OT, and UVLO
Applications:
- Industrial PC, EPOS, factory automation and control
- Multifunction printers, video conference system
- Monitors, TV, speakers, PC and notebooks, portable electronics
- General purposes for 12V, 19V, 24V power-bus supply
Package:
- RPA (VQFN-HR, 10-pin) 3.0mm × 3.0mm
Features
- 4.5V to 28V input voltage range
- 0.6V to 13V output voltage range
- Supports 10A continuous output current
- Integrated 19.4mΩ and 8.5mΩ MOSFETs
- 0.6V ±1% reference voltage at 25°C
- 45μA low quiescent current
- D-CAP3 ™ control mode for fast transient response
- Eco-mode (auto-skip mode) for high light-load efficiency
- Fixed 500kHz switching frequency
- Cycle by cycle over current limit
- Adjustable soft-start time with default 1.8ms
- Built-in output discharge function
- Power-good indicator to monitor output voltage
- Supports up to 98% duty operation
- Non-latched protections for UV, OV, OT, and UVLO
- -40°C to +150°C operating junction temperature
- Small 10-pin 3.0mm × 3.0mm HotRod ™ QFN package
- Pin-to-pin compatible with 6A TPS56637 and 8A TPS56837
Applications
- Industrial PC, EPOS, factory automation and control
- Multifunction printers, video conference system
- Monitors, TV, speakers, PC and notebooks, portable electronics
- General purposes for 12V,19V, 24V power-bus supply
Pin Configuration
Figure 4-1. RPA Package, 10-Pin VQFN-HR (Top View)
Table 4-1. Pin Functions
| PIN | PIN | TYPE (1) | DESCRIPTION |
|---|---|---|---|
| NAME | NO. | ||
| EN | 1 | I | Enable input control. Driving EN high or leaving this pin floating enables the converter. A resistor divider between this pin, VIN and AGND can be used to implement an external UVLO. |
| FB | 2 | I | Output feedback. Connect FB to the output voltage with a feedback resistor divider. |
| AGND | 3 | G | Ground of internal analog circuitry. Connect AGND to PGND plane at a single point. |
| PG | 4 | O | Open drain power-good indicator, this pin is asserted low if output voltage is out of PG threshold due to overvoltage, undervoltage, thermal shutdown, EN shutdown, or during soft start. |
| SS | 5 | O | Soft-start time selection pin. Connecting an external capacitor to AGND to set the soft-start time and if no external capacitor is connected, the soft-start time is 1.8ms by default. |
| SW | 6 | O | Switching node terminal. Connect the output inductor to this pin with wide and short tracks. |
| BOOT | 7 | I | Supply input for the gate drive voltage of the high-side MOSFET. Connect a 0.1μF bootstrap capacitor between BOOT and SW. |
| VIN | 8 | P | Input voltage supply pin. Drain terminal of high-side MOSFET. Connect the input decoupling capacitors between VIN and PGND. |
| PGND | 9 | G | Power GND terminal. Source terminal of low-side MOSFET. |
| MODE | 10 | I | Connect this pin with a 52.3K resistor to AGND. |
Electrical Characteristics
The electrical ratings specified in this section apply to all specifications in this document unless otherwise noted. These specifications are interpreted as conditions that do not degrade the parametric or functional specifications of the device for the life of the product containing it. Typical values correspond to TJ = 25°C, VIN = 24V. Minimum and maximum limits are based on TJ = -40°C to +150°C, VIN = 4.5V to 28V (unless otherwise noted).
| PARAMETER | PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT |
|---|---|---|---|---|---|---|
| SUPPLY CURRENT | SUPPLY CURRENT | SUPPLY CURRENT | SUPPLY CURRENT | SUPPLY CURRENT | SUPPLY CURRENT | SUPPLY CURRENT |
| I Q | Quiescent current, Operating (1) | T J = 25°C, V EN = 5V, V FB = 0.65V, non-switching | 45 | μA | ||
| I SHDNN | Shutdown supply current | T J = 25°C, V EN = 0V | 3 | μA | ||
| UVLO | UVLO | UVLO | UVLO | UVLO | UVLO | UVLO |
| UVLO | V IN undervoltage lockout | Wake up V IN voltage | 4.0 | 4.2 | 4.4 | V |
| Shutdown V IN voltage Hysteresis V IN voltage | 3.5 | 3.65 550 | 3.8 | V mV | ||
| ENABLE(EN PIN) | ENABLE(EN PIN) | ENABLE(EN PIN) | ENABLE(EN PIN) | ENABLE(EN PIN) | ENABLE(EN PIN) | ENABLE(EN PIN) |
| I EN_PULLUP | EN pullup current | V EN = 1.1V | 1 | μA | ||
| I EN_HYS | Hysteresis current | V EN = 1.3V | 3 | μA | ||
| V EN_ON | Enable threshold | EN rising | 1.18 | 1.26 | V | |
| V EN_OFF | EN falling | 1 | 1.07 | V | ||
| FEEDBACK VOLTAGE | FEEDBACK VOLTAGE | FEEDBACK VOLTAGE | FEEDBACK VOLTAGE | FEEDBACK VOLTAGE | FEEDBACK VOLTAGE | FEEDBACK VOLTAGE |
| V FB | Feedback voltage | V OUT = 5V, continuous mode operation, T J = 25°C | 0.594 | 0.6 | 0.606 | V |
| V OUT = 5V, continuous mode operation, T J = -40°C to 150°C | 0.591 | 0.6 | 0.609 | V | ||
| MOSFET | MOSFET | MOSFET | MOSFET | MOSFET | MOSFET | MOSFET |
| R dson_HS | High-side MOSFET on-resistance | T J = 25°C, V BST - V SW = 5V | 19.4 | mΩ | ||
| R dson_LS | Low-side MOSFET on-resistance | T J = 25°C | 8.5 | mΩ | ||
| CURRENT LIMIT | CURRENT LIMIT | CURRENT LIMIT | CURRENT LIMIT | CURRENT LIMIT | CURRENT LIMIT | CURRENT LIMIT |
| I LS_OCL | Low-side MOSFET valley current limit | 10 | 12 | 13.8 | A | |
| I HS_OCL | High-side MOSFET peak current limit | 12.75 | 15 | 17.25 | A |
Absolute Maximum Ratings
Over the recommended operating junction temperature range of -40°C to +150°C (unless otherwise noted) (1)
| MIN | MAX | UNIT | ||
|---|---|---|---|---|
| V IN | -0.3 | 32 | V | |
| BOOT | -0.3 | SW + 6 | V | |
| BOOT-SW | -0.3 | 6 | V | |
| EN, FB, MODE | -0.3 | 6 | V | |
| PGND, AGND | -0.3 | 0.3 | V | |
| SW | -2 | 32 | V | |
| SW (<10ns transient) | -5 | 35 | V | |
| PG, SS | -0.3 | 6 | V | |
| Operating junction temperature, T J | Operating junction temperature, T J | -40 | 150 | °C |
| Storage temperature, T stg | Storage temperature, T stg | -65 | 150 | °C |
Recommended Operating Conditions
Over the recommended operating junction temperature range of -40°C to 150°C (unless otherwise noted). (1)
| MIN | NOM | MAX | UNIT | ||
|---|---|---|---|---|---|
| Input voltage | V IN | 4.5 | 28 | V | |
| Input voltage | BOOT | -0.1 | SW + 5.5 | ||
| Input voltage | BOOT-SW | -0.1 | 5.5 | V | |
| Input voltage | EN, FB, SS, MODE | -0.1 | 5.5 | V | |
| Input voltage | PGND, AGND | -0.1 | 0.1 | V | |
| SW | -1 | 28 | V | ||
| PG | -0.1 | 5.5 | V | ||
| Operating junction temperature, T J | Operating junction temperature, T J | -40 | 150 | °C |
Thermal Information
| THERMAL | METRIC (1) | TPS56A37 QFN HotRod PINS | UNIT |
|---|---|---|---|
| 10 | |||
| R θJA | Junction-to-ambient thermal resistance (JEDEC) (2) | 68.1 | °C/W |
| Eff R θJA | Effective junction-to-ambient thermal resistance (4-layer TI EVM) | 30 | °C/W |
| R θJC(top) | Junction-to-case (top) thermal resistance | 40.4 | °C/W |
| R θJB | Junction-to-board thermal resistance | 17.6 | °C/W |
| Ψ JT | Junction-to-top characterization parameter | 1.4 | °C/W |
| Ψ JB | Junction-to-board characterization parameter | 17.2 | °C/W |
Typical Application
The schematic of Figure 7-1 shows a typical application for TPS56A37. This design converts an input voltage range of 5.5V to 28V down to 5V with a maximum output current of 10A.
Package Information
| PART NUMBER | PACKAGE (1) | PACKAGE SIZE (2) |
|---|---|---|
| TPS56A37 | RPA (VQFN-HR, 10) | 3.00mm × 3.00mm |
- (1) For more information, see Section 10.
- (2) The package size (length × width) is a nominal value and includes pins, where applicable.
Iout (A)
Efficiency, Vout = 5V, Fsw = 500kHz
Related Variants
The following components are covered by the same datasheet.
| Part Number | Manufacturer | Package |
|---|---|---|
| TPS56A37RPAR | Texas Instruments | 10-PowerVFQFN |
| TPS56A37RPAR.A | Texas Instruments | VQFN-HR-10 (3.0mm x 3.0mm) |
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