LP87702-Q1 Dual Buck Converter and 5-V Boost With Diagnostic Functions | TI.com

LP87702-Q1 (ACTIVE)

Dual Buck Converter and 5-V Boost With Diagnostic Functions

 

Description

The LP87702-Q1 meets the power management requirements of the latest platforms, particularly in automotive radar and camera and industrial radar applications. The device contains two step-down DC/DC converters, a 5-V boost converter/bypass switch, two voltage monitoring inputs for external power supplies, and window watchdog. An I2C-compatible serial interface and enable signals control the device.

The automatic PWM/PFM (AUTO mode) operation gives high efficiency over a wide output current range for buck converters. The LP87702-Q1 uses remote voltage sensing for buck converters to compensate IR drop between the converter output and the point-of-load, thus improving the accuracy of the output voltage. In addition, the switching clock can be forced to PWM mode and also synchronized to an external clock for minimal disturbances.

The LP8770 device has internal circuitry specifically designed to support current measurement, eliminating the need for an external resistor. Programmable start-up and shutdown sequences synchronized to the enable signal are supported, including general purpose digital outputs. During start-up and voltage change, the device controls the output slew rate for minimum output voltage overshoot and inrush current.

Features

  • AEC-Q100 Qualified for Automotive Applications:
    • Device Temperature Grade 1: –40°C to +125°C, TA
  • Two High-Efficiency Step-Down DC/DC converters:
    • Maximum Output Current 3.5 A
    • 2-MHz, 3-MHz, or 4-MHz Switching Frequency
    • Auto PWM/PFM and Forced-PWM Operations
    • Output Voltage = 0.7 V to 3.36 V
  • 5-V Boost Converter With Bypass-Mode Option:
    • Maximum Output Current 600 mA
  • Two Inputs for External Voltage Monitoring
  • Two Programmable Power-Good Signals
  • Dedicated Reference Voltage for Diagnostics
  • Window Watchdog With Reset Output
  • External Clock Input to Synchronize Switching
  • Spread-Spectrum Modulation
  • Programmable Start-up and Shutdown Delays and Sequencing With Enable Signal
  • Configurable General Purpose Outputs (GPOs)
  • I2C-Compatible Interface Supporting Standard (100 kHz), Fast (400 kHz), Fast+ (1 MHz), and High-Speed (3.4 MHz) Modes
  • Interrupt Function With Programmable Masking
  • Output Short-Circuit and Overload Protection
  • Overtemperature Warning and Protection
  • Overvoltage Protection (OVP) and Undervoltage Lockout (UVLO)

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Parametrics Compare all products in Multi-channel ICs (PMIC)

 
Regulated outputs (#)
Processor supplier
Processor name
Vin (Min) (V)
Vin (Max) (V)
Step-Up DC/DC Controller
Step-Down DC/DC Controller
LDO
Step-Up DC/DC Converter
Step-Down DC/DC Converter
Iout (Max) (A)
Iq (Typ) (mA)
Features
Shutdown Current (Typ) (uA)
Rating
Operating temperature range (C)
Pin/package
Configurability
LP87702-Q1 LP87524B-Q1 LP87524J-Q1
3     4     4    
TI     Texas Instruments     Texas Instruments    
AWRxxx, IWRxxx     AWR1x     AWR12/14/16    
2.8     2.8     2.8    
5.5     5.5     5.5    
0     0     0    
0     0     0    
0     0     0    
1     0     0    
2     4     4    
3.5     10     10    
27     0.0067      
Dynamic Voltage Scaling
Enable
Enable Pin
I2C Control
Over Current Protection
Power Good
Power Sequencing
Power Supply and System Monitoring
Spread-Spectrum Clock (SSC) Generation
Thermal Shutdown
UVLO Fixed    
Diagnostics
Dynamic Voltage Scaling
Eco-mode
Enable
Enable Pin
I2C Control
Over Current Protection
Power Good
Power Sequencing
Power Supply and System Monitoring
Spread-Spectrum Clock (SSC) Generation
Synchronous Rectification
Thermal Shutdown
UVLO Fixed    
Diagnostics
Dynamic Voltage Scaling
Eco-mode
Enable
Enable Pin
I2C Control
Over Current Protection
Power Good
Power Sequencing
Power Supply and System Monitoring
Spread-Spectrum Clock (SSC) Generation
Synchronous Rectification
Thermal Shutdown
UVLO Fixed    
1     1.4      
Automotive     Automotive     Automotive    
-40 to 125     -40 to 125     -40 to 125    
32VQFN     26VQFN-HR     26VQFN-HR    
  Factory programmable
Software configurable    
Factory programmable
Software configurable