LP3907_14 Datasheet, PDF (40/57 Pages) Texas Instruments – Dual High-Current Step-Down DC/DC and Dual Linear Regulator with I2C-Compatible Interface

LP3907
SNVS511N – JUNE 2007 – REVISED AUGUST 2011
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LDO2 CONTROL REGISTER (LDO2VCR) – 0X3A
This register allows the user to program the output target voltage of LDO 2.
For “JJ11” voltage options LDO2 has a fixed output voltage of 2.85V.
Name
Access
Data
Reset
D7-5
—
—
Reserved
000
D4-0
LDO2_OUT
R/W
LDO2 Output voltage (V)
5’h00
1.0
5’h01
1.1
5’h02
1.2
5’h03
1.3
5’h04
1.4
5’h05
1.5
5’h06
1.6
5’h07
1.7
5’h08
1.8
5’h09
1.9
5’h0A
2.0
5’h0B
2.1
5’h0C
2.2
5’h0D
2.3
5’h0E
2.4
5’h0F
2.5
5’h10
2.6
5’h11
2.7
5’h12
2.8
5’h13
2.9
5’h14
3.0
5’h15
3.1
5’h16
3.2
5’h17
3.3
5’h18
3.4
5’h19
3.5
5’h1A–5’h1F
3.5
Factory-Programmed Default
Application Notes
ANALOG POWER SIGNAL ROUTING
All power inputs should be tied to the main VDD source (i.e. battery), unless the user wishes to power it from
another source. (i.e. external LDO output).
The analog VDD inputs power the internal bias and error amplifiers, so they should be tied to the main VDD. The
analog VDD inputs must have an input voltage between 2.8 and 5.5V, as specified in the Electrical
Characteristics Section in the front of the datasheet.
The other V_INs (V_INLDO1, V_INLDO2, V_IN1, V_IN2) can actually have inputs lower than 2.8V, as long as it's higher
than the programmed output (+0.3V, to be safe).
The analog and digital grounds should be tied together outside of the chip to reduce noise coupling.
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