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LP3907 Datasheet(PDF) 17 Page - Texas Instruments

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Part # LP3907
Description  Dual High-Current Step-Down DC-DC and Dual Linear Regulator
PDF  58 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LP3907 Datasheet(HTML) 17 Page - Texas Instruments

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OSC
Logic Control
and
Registers
I
2C
SW2
VFB2
Cvdd
4.7PF
nPOR
BUCK1
BUCK2
Lsw1
SW1
VFB1
LDO2
RESET
LDO2
GND_C
BIAS
Thermal
Shutdown
Power On
Reset
Lsw1
VINLDO1
VBUCK2
LDO1
LDO1
Cldo1
VinLDO12
Cldo2
Power
ON-OFF
Logic
VBUCK1
EN_T
ENLDO1
ENLDO2
ENSW 1
ENSW 2
VINLDO2
AVDD
AVDD
1 uF
+
VDD
RDY1
RDY2
ULVO
Vin OK
100k
10PF
1PF
1PF
1PF
Li-ion/polymer cell 3.3V - 4.2V
DC SOURCE
4.5V - 5.5V
GND_L
GND_SW2
GND_SW1
I
2
C_SDA
I
2
C_SCL
1.8V
0.47 PF
0.47 PF
3.3V
10 PF
3.3V
10 PF
1.2V
2.2 PH
2.2 PH
10 PF
Copyright © 2016, Texas Instruments Incorporated
17
LP3907
www.ti.com
SNVS511S – JUNE 2007 – REVISED APRIL 2016
Product Folder Links: LP3907
Submit Documentation Feedback
Copyright © 2007–2016, Texas Instruments Incorporated
(1)
For default values of the regulators, consult Table 3.
8 Detailed Description
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
OUTPUT
VOUT RANGE (V)
RESOLUTION (mV)
IMAX
MAXIMUM OUTPUT CURRENT (mA)
LDO1
analog
1 to 3.5
100
300
LDO2
analog
1 to 3.5
100
300
SW1
digital
0.8 to 2
50
1000
SW2
digital
1 to 3.5
100
600
8.2 Functional Block Diagram



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