Setup
Test Points:
• VBAT
Power Input
• VIN_D, VIN
Power Input after the reverse battery protection diode.
• IGN
Ignition, monitors if IGN-input is high, powering up the device.
• IGN_EN
Ignition enable (IGN after series resistor).
• BOOT_LDO
Voltage at internal regulator, which supplies the power to charge the flying boot
capacitor.
• VREG
Regulated output of switch-mode converter, supplying 5.3V.
• DELAY
Input for reset delay.
• SS
Input for soft start time.
• EN
Enable pin, if high, the device remains active after IGN is transitioning to low.
• GND
(x7) Ground
• PH
Switch node, source of internal switching FET.
• nRST
Reset output for Switcher, asserted high after VREG, 3.3V and 1.2V regulator
outputs are regulating and delay timer has expired.
• 3.3V
3.3V - Linear regulator output
• 3.3VDRIVE
Base drive for external 3.3V-regulator bipolar transistor.
• 1.2V
1.2V - Linear regulator output.
• 1.2VDRIVE
Base drive for external 1.2V-regulator bipolar transistor.
• VSENSE
Inverting node of error amplifier for voltage mode control of VREG.
• IGN_ST
Ignition input indicator. Asserted high while ignition input is high.
• 5V
Output of the 5V linear regulator. Since no screw-terminal is provided for this
output, use the test-point to attach a load.
5
SLVU685 – February 2012
TPS65300EVM
Copyright © 2012, Texas Instruments Incorporated