LP87702 - Dual Buck + 5V Boost PMIC | Texas Instruments
MPN: LP87702 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.5 | $4.50 |
| 10 | $4.05 | $40.50 |
| 100 | $3.6 | $360.00 |
| 500 | $3.24 | $1,620.00 |
| 1,000 | $2.88 | $2,880.00 |
Drop-in alternatives for LP87702 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
LP87702-Q1
β Drop-Inπ Reference alternative (not in catalog)
LP87702KRHBR
β Drop-Inπ Reference alternative (not in catalog)
LP87702KRHBT
β Drop-Inπ Reference alternative (not in catalog)
TPS65653-Q1
β Drop-Inπ Reference alternative (not in catalog)
TPS65023
β Drop-Inπ Reference alternative (not in catalog)
LP87702 Maximum Ratings & Electrical Characteristics
| Number of Buck Converters | 2 |
| Number of Boost Converters | 1 |
| Input Voltage Range | 2.8 V to 5.5 V |
| Buck Output Current (each) | 3 A |
| Boost Output Voltage | 5 V |
| Boost Output Current | 600 mA |
| Switching Frequency | 2.2 MHz |
| Remote Voltage Sensing | Yes |
| Voltage Monitoring Inputs | 2 |
| Window Watchdog | Yes |
| I2C Interface | Yes |
| Package | VQFN-32 (5x5 mm) |
| Operating Temperature Range | -40C to +125C |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
LP87702 Pin Configuration
| Pin 1 | VIN β Input supply voltage |
| Pin 2 | GND β Ground |
| Pin 3 | SW_BUCK0 β Switch node for buck converter 0 |
| Pin 4 | FB_BUCK0 β Feedback for buck converter 0 |
| Pin 5 | EN_BUCK0 β Enable for buck converter 0 |
| Pin 6 | SW_BUCK1 β Switch node for buck converter 1 |
| Pin 7 | FB_BUCK1 β Feedback for buck converter 1 |
| Pin 8 | EN_BUCK1 β Enable for buck converter 1 |
| Pin 9 | SW_BOOST β Switch node for boost converter |
| Pin 10 | FB_BOOST β Feedback for boost converter |
| Pin 11 | EN_BOOST β Enable for boost converter |
| Pin 12 | VOUT_BOOST β Boost output voltage |
| Pin 13 | VMON1 β Voltage monitor input 1 |
| Pin 14 | VMON2 β Voltage monitor input 2 |
| Pin 15 | WD β Watchdog input |
| Pin 16 | I2C_SCL β I2C clock |
| Pin 17 | I2C_SDA β I2C data |
| Pin 18 | GND β Ground |
| Pin 19 | VOUT_BUCK0 β Buck converter 0 output |
| Pin 20 | VOUT_BUCK1 β Buck converter 1 output |
| Pin 21 | PG β Power good indicator |
| Pin 22 | EN β Master enable |
| Pin 23 | GND β Ground |
| Pin 24 | VIN β Input supply voltage |
| Pin 25 | GND β Ground |
| Pin 26 | NC β No connect |
| Pin 27 | NC β No connect |
| Pin 28 | NC β No connect |
| Pin 29 | NC β No connect |
| Pin 30 | NC β No connect |
| Pin 31 | NC β No connect |
| Pin 32 | NC β No connect |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
LP87702 is suitable for 6 applications: Automotive Radar, Industrial Radar, ADAS Domain Controller, Portable Instrumentation, Safety-Critical Industrial Control, Telematics and Connectivity.
Automotive Radar
The LP87702 provides multiple power rails for automotive radar processors and RF front-ends. Its dual buck converters deliver up to 3A each for digital cores and I/O, while the 5V boost supplies the RF transceiver. The integrated voltage monitors and watchdog ensure safe operation in safety-critical ADAS systems, meeting AEC-Q100 requirements with the Q1 variant.
Recommended
Industrial Radar
In industrial radar systems, the LP87702 powers the signal processing chain and communication interfaces. The dual bucks provide efficient step-down for FPGA and MCU cores, while the boost generates a 5V rail for sensors and Ethernet PHYs. The device's diagnostic features enable predictive maintenance and fault logging, enhancing system uptime in factory automation.
Recommended
ADAS Domain Controller
The LP87702 is ideal for ADAS domain controllers that require multiple high-current rails for processors and sensors. Its remote voltage sensing ensures accurate voltages at the point-of-load, critical for high-performance SoCs. The programmable start-up sequencing and watchdog support ASIL-D safety architectures, making it a key component in autonomous driving systems.
Recommended
Portable Instrumentation
For battery-powered industrial instruments, the LP87702 efficiently converts battery voltage to multiple rails. The high switching frequency allows small external components, reducing board space. The boost converter can generate a 5V rail for sensors or displays, while the bucks power the MCU and analog front-end. The I2C interface enables dynamic voltage scaling to extend battery life.
Recommended
Safety-Critical Industrial Control
The LP87702's integrated voltage monitors and window watchdog make it suitable for safety-critical industrial control systems, such as PLCs and robotic controllers. The dual bucks provide redundant power rails for redundant processors, while the boost supplies actuators. The device's diagnostic functions help achieve SIL ratings by detecting faults and initiating safe shutdown.
Recommended
Telematics and Connectivity
In automotive telematics units, the LP87702 powers the application processor, cellular modem, and GNSS receiver. The dual bucks provide efficient power for the processor and memory, while the boost generates a 5V rail for the modem. The device's low quiescent current and high efficiency help minimize battery drain in always-on systems.
Recommended
Recommended Products Summary
Engineering reference data for LP87702 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LP87702-Q1 | LP87702KRHBR | TPS65653-Q1 | TPS65023 |
|---|---|---|---|---|---|
| Package | VQFN-32 (5x5 mm) | VQFN-32 (5x5 mm) | VQFN-32 (5x5 mm) | VQFN-32 (5x5 mm) | VQFN-32 (5x5 mm) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Number of Bucks | 2 | 2 | 2 | 2 | 2 |
| Number of Boosts | 1 | 1 | 1 | 1 | 1 |
| Buck Output Current (each) | 3 A | 3 A | 3 A | 2.5 A | 2 A |
| Boost Output Current | 600 mA | 600 mA | 600 mA | 500 mA | 400 mA |
| Switching Frequency | 2.2 MHz | 2.2 MHz | 2.2 MHz | 2.2 MHz | 2.2 MHz |
| Automotive Grade | No | Yes (AEC-Q100) | No | Yes (AEC-Q100) | No |
Key Differentiators
- Integrated diagnostic functions (vs TPS65023)
- Higher buck output current (vs TPS65023)
- Automotive grade option (vs LP87702KRHBR)
Design Notes
For optimal performance, place the LP87702 close to the load and use a solid ground plane. Decouple each power input with a 10uF ceramic capacitor and a 0.1uF capacitor for high-frequency noise. The switch nodes (SW_BUCK0, SW_BUCK1, SW_BOOST) should have short, wide traces to minimize parasitic inductance and EMI.
The LP87702 in a VQFN-32 package can dissipate significant power at high currents. Ensure adequate thermal vias under the exposed pad to conduct heat to the PCB ground plane. For continuous operation at maximum load, consider a copper area of at least 1 square inch on the top and bottom layers to keep the junction temperature below 125C.
Do not exceed the absolute maximum input voltage of 5.5V. Ensure the remote sensing pins are connected to the point-of-load to achieve the specified output accuracy. Configure the watchdog and voltage monitors according to the system safety requirements; leaving them unconfigured may cause unintended resets or missed fault detection.
Compliance Information
RoHS compliant per TI product page. AEC-Q100 qualification applies to the Q1 variant only.
