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| LP3907 Datasheet, PDF (17/58 Pages) National Semiconductor (TI) – Dual High-Current Step-Down DC/DC and Dual Linear Regulator with I2C Compatible Interface | |||
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www.ti.com
8 Detailed Description
LP3907
SNVS511S â JUNE 2007 â REVISED APRIL 2016
8.1 Overview
The LP3907 supplies the various power needs of the application by means of two linear low drop regulators
(LDO1 and LDO2) and two buck converters (SW1 and SW2). Table 4 lists the output characteristics of the
various regulators.
Table 4. Supply Specification
SUPPLY (1)
LOAD
VOUT RANGE (V)
OUTPUT
RESOLUTION (mV)
LDO1
analog
1 to 3.5
100
LDO2
analog
1 to 3.5
100
SW1
digital
0.8 to 2
50
SW2
digital
1 to 3.5
100
(1) For default values of the regulators, consult Table 3.
IMAX
MAXIMUM OUTPUT CURRENT (mA)
300
300
1000
600
8.2 Functional Block Diagram
DC SOURCE
4.5V - 5.5V
+
Li-ion/polymer cell 3.3V - 4.2V
Cvdd
1P F
4.7PF
1PF 1PF
1 uF 10PF 10 PF
ENLDO1
ENLDO2
ENSW 1
ENSW 2
EN_T
I2C_SCL
I2C_SDA
ULVO
Vin OK
OSC
AVDD
BUCK1
Power
ON-OFF
Logic
BUCK2
AVDD
RESET
Thermal
Shutdown
VINLDO1
LDO1
VinLDO12
VINLDO2
I2C
BIAS
LDO2
Logic Control
and
Registers
RDY1 RDY2
Power On
Reset
Lsw1 2.2 PH 1.2V
VBUCK1
SW1
10 PF
VFB1
Lsw1 2.2 PH 3.3V
VBUCK2
SW2
VFB2
10 PF
LDO1
3.3V
Cldo1
0.47 PF
LDO2
1.8V
Cldo2
0.47 PF
VDD
nPOR 100k
GND_SW1
GND_SW2
GND_C
GND_L
Copyright © 2016, Texas Instruments Incorporated
Copyright © 2007â2016, Texas Instruments Incorporated
Product Folder Links: LP3907
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