LP3907 Datasheet, PDF (1/58 Pages) National Semiconductor (TI) – Dual High-Current Step-Down DC/DC and Dual Linear Regulator with I2C Compatible Interface

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LP3907
SNVS511S – JUNE 2007 – REVISED APRIL 2016
LP3907 Dual High-Current Step-Down DC-DC and Dual Linear Regulator With I²C Interface
1 Features
•1 Input Voltage Range: 2.8 V to 5.5 V
• Compatible with Advanced Applications
Processors and FPGAs
• 2 LDOs for Powering Internal Processor Functions
and I/Os
• High-Speed Serial Interface for Independent
Control of Device Functions and Settings
• Precision Internal Reference
• Thermal Overload Protection
• Current Overload Protection
• Software Programmable Regulators
• External Power-On-Reset Function for Buck1 and
Buck2 (Power Good with Delay Function)
• Undervoltage Lockout Detector to Monitor Input
Supply Voltage
• Step-Down DC-DC Converter (Buck)
– Programmable V_OUT from:
– Buck1 : 0.8 V–2 V at 1 A
– Buck2 : 1 V–3.5 V at 600 mA
– Up to 96% Efficiency
– 2.1-MHz PWM Switching Frequency
– PWM-to-PFM Automatic Mode Change
Under Low Loads
– ±3% Output Voltage Accuracy
– Automatic Soft Start
• Linear Regulators (LDO)
– Programmable V_OUT of 1 V to 3.5 V
(except JJ11, FX6W, and JX6X options)
– ±3% Output Voltage Accuracy
– 300-mA Output Current
– 30-mV (typical) Dropout
2 Applications
• FPGA, DSP Core Power
• Applications Processors
• Peripheral I/O Power
• Hearing Aids
• Electronic Measurement Units
• Equipment Run-Off of Battery Backup
3 Description
The LP3907 is a multi-function, programmable power
management unit (PMU) optimized for low-power
FPGAs, microprocessors, and DSPs. This device
integrates two highly efficient 1-A/600-mA step-down
DC-DC converters with dynamic voltage management
(DVM), two 300-mA linear regulators, and a 400-kHz
I²C interface to allow a host controller access to the
internal control registers of the device. The LP3907
additionally features programmable power-on
sequencing.
PART NUMBER
LP3907
Device Information⁽¹⁾
PACKAGE
BODY SIZE
WQFN (24)
4.00 mm × 4.00 mm
(NOM)
DSBGA (25)
2.521 mm × 2.521 mm
(MAX)
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application Circuit
0.47 PF
1 PF
1 PF
0.47 PF
EN_T
ENLDO1
ENLDO2
ENSW1
ENSW2
LDO1
VINLDO1
VINLDO2
LDO2
SDA
SCL
GND_L
GND_C
LP3907
VINLDO12
VDD
100k
nPOR
1 PF
VIN1
10 PF
SW1
2.2 PH
FB1
10 PF
GND_SW1
VIN2
10 PF
SW2
FB2
2.2 PH
10 PF
GND_SW2
DAP
AVDD
1 PF
Copyright © 2016, Texas Instruments Incorporated
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.