Texas Instruments Evaluation Board for the LM10506 LM10506EVAL/NOPB LM10506EVAL/NOPB Datenbogen
Produktcode
LM10506EVAL/NOPB
SNVS729E – SEPTEMBER 2011 – REVISED MARCH 2013
Device Operating Modes
STARTUP SEQUENCE
The startup mode of the LM10506 will depend on the input voltage. Once VIN reaches the UVLO threshold, there
is a 15 msec delay before the LM10506 determines how to set up the buck regulators. If V
is a 15 msec delay before the LM10506 determines how to set up the buck regulators. If V
IN
is below 3.6V, then
Buck 1 and Buck 2 will be in bypass mode, see
for functionality description. If the VIN voltage is greater than 3.6V the bucks will start up as
the standard regulators. The 3 buck regulators are staggered during startup to avoid large inrush currents. There
is a fixed delay of 2 msec between the startup of each regulator.
is a fixed delay of 2 msec between the startup of each regulator.
The Startup Sequence will be:
1. 15 msec (±30%) delay after V
IN
above UVLO
2. LDO
→
3.2V
→
3.2V
3. 2 msec delay
4. Buck 1
→
3.0V
→
3.0V
5. 2 msec delay
6. Buck 2
→
3.0V or if H/L_B2 = Low
→
1.8V
–
(For LM10506-A Buck 2
→
2.0V or if H/L_B2 = Low
→
1.8V)
7. 2 msec delay
8. Buck 3
→
1.2V or if H/L_B3 = Low
→
1.0V
Copyright © 2011–2013, Texas Instruments Incorporated
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