LP8720TLE NSC [National Semiconductor], LP8720TLE Datasheet - Page 16

• Manufacturer Part Number: LP8720TLE
• Description: One Step-Down DC/DC and Five Linear Regulators with I2C Compatible Interface
• Manufacturer: NSC [National Semiconductor]

www.national.com
LDO’s
There are all together 5 LDO’s in LP8720 grouped as
The A-type LDO’s are optimized for supplying of analog loads
and have ultra low noise (15 µVRMS) and excellent PSRR
(70dB) performance.
The D-type LDO’s are optimized for good dynamic perfor-
mance to supply different fast changing (digital) loads.
The LO-type LDO is optimized for low output voltage and for
good dynamic performance to supply different fast changing
(digital) loads.
Data Code
LDOx_V
A-type LDO’s (LDO 2,3)
D-type LDO’s (LDO 1,5)
LO-type LDO (LDO4)
5h’0C
5h’0D
5h’00
5h’01
5h’02
5h’03
5h’04
5h’05
5h’06
5h’07
5h’08
5h’09
5h’0A
5h’0B
5h’0E
5h’0F
LDO1, 2, 3 and 5 Output Voltage Programming
LDOx [V]
1.20
1.25
1.30
1.35
1.40
1.45
1.50
1.55
1.60
1.65
1.70
1.75
1.80
1.85
1.90
2.00
Data Code
LDOx_V
5h’1C
5h’1D
5h’1A
5h’1B
5h’1E
5h’1F
5h’10
5h’11
5h’12
5h’13
5h’14
5h’15
5h’16
5h’17
5h’18
5h’19
LDOx [V]
2.10
2.20
2.30
2.40
2.50
2.60
2.65
2.70
2.75
2.80
2.85
2.90
2.95
3.00
3.10
3.30
16
All LDO’s can be programmed through serial interface for 32
different output voltage value, which are summarized in the
in the “LDO Output Voltage Programming” tables below.
At the PMU power on, LDO’s start up according to the select-
ed startup sequence and the default voltages after start-up
sequence depend on startup setup. See section Power-On
and Power-Off Sequences for details.
For stability all LDO’s have to have connected to output an
external capacitor C
is important to select the type of capacitor which capacitance
will in no case (voltage, temperature, etc) be outside of limits
specified in the LDO electrical characteristics.
Data Code
LDO4_V
5h’0C
5h’0D
5h’00
5h’01
5h’02
5h’03
5h’04
5h’05
5h’06
5h’07
5h’08
5h’09
5h’0A
5h’0B
5h’0E
5h’0F
LDO4 Output Voltage Programming
LDO4 [V]
OUT
0.80
0.85
0.90
1.00
1.10
1.20
1.25
1.30
1.35
1.40
1.45
1.50
1.55
1.60
1.65
1.70
with recommended value of 1 µF. It
Data Code
LDO4_V
5h’1C
5h’1D
5h’10
5h’11
5h’12
5h’13
5h’14
5h’15
5h’16
5h’17
5h’18
5h’19
5h’1A
5h’1B
5h’1E
5h’1F
LDO4 [V]
1.75
1.80
1.85
1.90
2.00
2.10
2.20
2.30
2.40
2.50
2.60
2.65
2.70
2.75
2.80
2.85