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PDF LP3906 Data sheet ( Hoja de datos )
| Número de pieza | LP3906 | |
| Descripción | Dual High Current Step Down DC/DC and Dual Linear Regulator | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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www.DataSheet4U.com
September 2006
LP3906
Dual High-Current Step-Down DC/DC and Dual Linear
Regulator with I2C Compatible Interface
General Description
The LP3906 is a multi-function, programmable Power Man-
agement Unit, optimized for low power FPGAs, Microproces-
sors and DSPs. This device integrates two highly efficient
1.5A Step-Down DC/DC converters with dynamic voltage
management (DVM), two 300mA Linear Regulators and a
400kHz I2C compatible interface to allow a host controller
access to the internal control registers of the LP3906. The
LP3906 additionally features programmable power-on se-
quencing and is offered in a tiny 5 x 4 x 0.8mm LLP-24 pin
package.
Key Specifications
Step-Down DC/DC Converter (Buck)
n 1.5A output current
n Programmable Vout from:
— Buck1 : 0.8V–2.0V
— Buck2 : 1.0V–3.5V
n Up to 96% efficiency
n 2 MHz PWM switching frequency
n ±3% output voltage accuracy
n Automatic soft start
Linear Regulators (LDO)
n Programmable VOUT of 1.0V–3.5V
n ±3% output voltage accuracy
n 300 mA output currents
n 25 mV (typ) Dropout
Features
n Compatible with advanced applications processors and
FPGAs
n 2 LDOs for powering Internal processor functions and
I/Os
n High speed serial interface for independent control of
device functions and settings
n Precision internal reference
n Thermal overload protection
n Current overload protection
n 24-lead 5 x 4 x 0.8 mm LLP package
n Software Programmable Regulators
Applications
n FPGA, DSP core power
n Applications processors
n Peripheral I/O power
© 2006 National Semiconductor Corporation DS201978
www.national.com
1 page  
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Pin Descriptions
Pin Pin Name
I/O
Type
Functional Description
1 VIN2
I
PWR
Power in from either DC source or Battery to Buck 2
2 SW2
O
PWR
Buck2 switcher output pin
3 GND_SW2
G
G Buck2 NMOS Power Ground
4 GND_C
G
G Non switching core ground pin
5 GND_SW1
G
G Buck1 NMOS Power Ground
6 SW1
O
PWR
Buck1 switcher output pin
7 VIN1
I
PWR
Power in from either DC source or Battery to buck 1
8 SDA
I/O
D I2C Data (Bidirectional)
9 SCL
I
D I2C Clock
10 EN_T
I
D Enable for preset power on sequence.
11 FB1
I
A Buck1 input feedback terminal
12 AVDD
I
PWR
Analog Power for Buck converters.
13 VINLDO1
I
PWR
Power in from either DC source or Battery to input terminal of
LDO1
14 LDO1
O
PWR
LDO1 Output
15 ENLDO1
I
D LDO1 enable pin, a logic HIGH enables the LDO1
16 ENLDO2
I
D LDO2 enable pin, a logic HIGH enables the LDO2
17 GND_L
G
G LDO Ground
18 LDO2
O
PWR
LDO2 Output
19 VINLDO2
I
PWR
Power in from either DC source or battery to input terminal to
LDO2
20 VinLDO12
I
PWR
Analog Power for Internal Functions (VREF, BIAS, I2C, Logic)
21 FB2
I
A Buck2 input feedback terminal
22 ENSW1
I
D Enable Pin for Buck1 switcher, a logic HIGH enables Buck1
23 SYNC
I
D Frequency Synchronization pin which allows the user to
connect an external clock signal PLL to synchronize the PMIC
internal oscillator.
24 ENSW2
I
D Enable Pin for Buck2 switcher, a logic HIGH enables Buck2
A: Analog Pin D: Digital Pin G: Ground Pin PWR: Power Pin I: Input Pin I/O: Input/Output Pin O: Output Pin
5 www.national.com
5 Page 
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Typical Performance Characteristics — Buck TA = 25˚C unless otherwise noted
Shutdown Current vs. Temp
Output Voltage vs. Supply Voltage
(Vout = 1.0 V)
20197843
Output Voltage vs. Supply Voltage
(Vout = 1.8V)
20197844
Output Voltage vs. Supply Voltage
(Vout = 3.5V)
20197845
Buck 1 Efficiency vs Output Current
(Forced PWM Mode, Vout =1.2V, L= 2.2µH)
20197846
Buck 1 Efficiency vs Output Current
(Forced PWM Mode, Vout =2.0V, L= 2.2µH)
20197847
11
20197848
www.national.com
11 Page | ||
| Páginas | Total 38 Páginas | |
| PDF Descargar | [ Datasheet LP3906.PDF ] | |
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