Datasheet

Modifications
1-3
Introduction
-
More Current From VMAIN – An external linear regulator U3 (e.g.,
TPS79201) powered from BOOT and supporting passives, C14, C15,
R17, and R19 can be added to provide more output current for VMAIN.
The linear regulator data sheet provides guidance on sizing the supporting
passives. Size feedback resistors R17 and R19 so that the regulator
output is about 1% below VMAIN. See theTPS6521x data sheet
(SLVS531) for guidance on sizing the output capacitor on BOOT relative
to C14.
- A Second Negative Rail, VGL2 – An external linear regulator U2 (e.g.,
TPS72301) powered from VGL and supporting passives C5, R5, R6, JP3,
and J5 can be added to provide a second negative voltage rail. The linear
regulator data sheet provides guidance on sizing the supporting passives.
The middle pin of JP3 connects to the EN pin on the TPS72301 IC. Tying
this pin to VIN enables the IC. Tying this pin to GND disables the IC. J5
is the output terminal for the second negative rail, VGL2. See the
TPS6521x data sheet (SLVS531) for guidance on sizing the output
capacitor on VGL relative to C5.
- Lower Output Ripple on VGH and VGL – C3 and C7 accommodate
10-pF feedforward capacitors that reduce the output ripple on VGH and
VGL, respectively.