Datasheet

2.9V
5.7V
5.6V
BG/BIAS
UVLO
LDO
Buck1
2 ms
2 ms
Buck 2 (Except LM10506-B)
VIN
~2.25V
3.5V
3.5V
3.5V
2.6V
2 ms
1.1V
BYPASS OPERATION
2 ms
15 ms
15 ms
2 ms
3.5V
2.6V
3.2V
PSML
2 ms
Buck3
Comparator
OVLO
B1 en Bypass
B2 en Bypass
2 ms
Standby
STARTUP STANDBYSTARTUPUVLO UVLOOVLO
BYPASS
OPERATION
1.1V
2 ms
Buck2 LM10506 -B Only.
2 ms
1.1V
2 ms
2.6V
2 ms
2 ms
2 ms
LM10506
SNVS729E –SEPTEMBER 2011–REVISED MARCH 2013 www.ti.com
Figure 26. Operating Modes
For LM10506 -C, -D, Buck 1 output pulldowns remain engaged for 8ms after UVLO during power up phase.
POWER-ON DEFAULT AND DEVICE ENABLE
The device is always enabled and the LDO is always on, unless outside of operating voltage range. There is no
LM10506 Enable Pin. Once V
IN
reaches a minimum required input Voltage the power-up sequence will be
started automatically and the startup sequence will be initiated. Once the device is started, the output voltage of
the Bucks 1 and 2 can be individually disabled by accessing their corresponding BKEN register bits (BUCK
CONTROL).
RESET: PIN FUNCTION
The RESET pin is internally pulled high. If the reset pin is pulled low, the device will perform a complete reset of
all the registers to their default states. This means that all of the voltage settings on the regulators will go back to
their default states.
STANDBY: FUNCTION
The Device can be programmed into Standby mode. There are 2 ways for doing that:
1. STANDBY pin
2. Programming via SPI
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Product Folder Links: LM10506