|
|
PDF SC900 Data sheet ( Hoja de datos )
| Número de pieza | SC900 | |
| Descripción | Programmable Penta ULDO | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de SC900 (archivo pdf) en la parte inferior de esta página. Total 23 Páginas | ||
|
No Preview Available !
POWER MANAGEMENT
Description
The SC900 is a highly integrated power management
device for low power portable applications. The device
contains five adjustable low-dropout linear regulators
(LDOs) with CMOS pass-devices as well as a band-gap
reference, I2C interface, and DACs to control the output
voltages.
Many features of the SC900 are programmable through
www.DatatShheeeIt42CU.cionmterface. These include the ability to indepen-
dently turn on any combination of the five regulators. All
five of the LDO output voltages are programmable in
50mV steps from 1.45V to 3.00V. Each LDO can have
an active shutdown or nonactive shutdown program op-
tion through the interface. There is also a reset monitor
flag that is associated with LDOA. In addition, the device
has a separate programmable power-good monitor flag
that activates when one or more LDOs go out of regula-
tion.
SC900
Programmable Penta ULDO with
RESET and I2C Interface
Features
! Five LDO regulators in one package
! I2C interface with multiple device capability
! Independent I2C enable/disable of LDOs
! Independent I2C control of output voltages
! Low thermal impedance of 40°C per watt
! 150mV dropout at 150mA
! Input range from 2.7V to 5.5V
! Programmable power-good flag
! Minimal number of external components
! Over temperature protection
! Small 4mm x 4mm 20-lead MLPQ package
! Small input/output filter capacitors
! Programmable VOUT range - 1.45V to 3.00V for
each LDO
The SC900 offers significant quiescent current and space
savings to the system designer by sharing reference and
biasing among five LDOs. The small and thermally effi-
cient 20-lead MLPQ package make it ideal for use in por-
table products where minimizing layout area is critical.
Typical Application Circuit
Applications
! Palmtop/Laptop computers
! Personal Digital Assistants
! Cellular telephones
! Battery-powered equipment
! High efficiency linear power supplies
4.7µF
VBAT
SC900
VIN
INA
INB
INCD
INE
EN
LDOPGD
ARST
SDA
SCL
A0
GND
LDOE
LDOD
LDOA
LDOB
LDOC
VREF
VASEL
DGND
2.2µF 2.2µF 2.2µF
0.1µF
Keypad
Baseband
Processor
Audio
Processing
Digital Interface
2.2µF
Receiver
Section
TXCO
&
Synthesizer
Transmitter
Section
2.2µF
LNA
PA
March 29, 2005
1 www.semtech.com
1 page  
SC900
POWER MANAGEMENT
Electrical Characteristics (Cont.)
Unless otherwise noted: VIN = 3.7V, EN = VIN, TA = -40 to 85°C. Typical values are at TA = +25°C.
Parameter
Symbol
Condition
Min Typ Max Units
LDO Regulator E
Output Voltage Accuracy
VOAE
1.45V < VOUT < 3.00V
VOUT +0.15V < VIN < 5.5V
IOUT = 1mA, TA = 25OC
-3
+3 %
Output Voltage Accuracy at 2.80V
(DAC=11011)
www.DataSheet4U.com
VOASE
IOUT = 1mA
IOUT = 150mA, VOUT + 0.5V < VIN < 5.5V
-2
-3.5
+2
+3.5
%
%
Maximum Output Current
IOMAXE
150 mA
Default Setting: OFF
VOE
2.80 V
Line Regulation at 2.80V
LINEREGE IOUT = 1mA, VOUT +0.15V < VIN < 5.5V
2.5 12 mV
Load Regulation at 2.80V
LOADREGE
1mA < IOUT < 150mA
-3 -20 mV
I2C Interface
Interface complies with slave mode I2C interface as described by Philips I2C specification version 2.1 dated January
2000.
Digital Input Voltage
SDA Output Low Level
Digital Input Current
I/O Pin Capacitance
I2C Timing
VIL 0.4 V
VIH 1.6 V
IDIN(SDA) = 3mA
0.4 V
IDIN(SDA) = 6mA
0.6 V
IDG -0.2 0.2 µA
CIN 10 pF
Clock Frequency
SCL
400 kHz
SCL Low Period
SCL High Period
Data Hold Time
Data Setup Time
Setup Time for Repeated
Start Condition
tLOW
tHIGH
tHD_DAT
tSU_DAT
tSU_STA
1.3 µs
0.6 µs
0 µs
100 ns
0.6 µs
Hold Time for Repeated
Start Condition
tHD_STA
0.6 µs
SetupTime for Stop Condition
Bus-Free Time Between
STOP and START
tSU_STO
tBUF
0.6 µs
1.3 µs
2005 Semtech Corp.
5
www.semtech.com
5 Page 
SC900
POWER MANAGEMENT
Applications Information (Cont.)
Active Shutdown
The shutdown control bits determine how the on-chip
active shutdown switches behave. Each LDO register
uses bit 5 of the LDO output voltage data byte to control
the shutdown behavior. When the active shutdown bit is
enabled (set to 1), the capacitance on the LDO output
will be discharged by an on-chip FET after the LDO is dis-
abled. When the active shutdown bit is disabled (set to
0), the output capacitance on the LDO output is dis-
charged by the load. The default active shutdown state
www.DatafSohreeatl4lUL.cDoOms is on.
ON/OFF Control Register
Each individual LDO may be turned on or off by access-
ing the ON/OFF control register. LDOs are turned on by
setting their respective on/off bit to 1. Likewise, they
can be turned off by setting the on/off bit to 0. This
allows for on/off control with a single write command. If
the enable (EN) pin is high and data is written to the LDO
voltage registers, the LDO outputs will go to the voltage
prescribed by the Output Voltage Code bits (0-4). Data
will not be lost when toggling the on/off bit from 0 to 1.
However, if the EN pin is forced low, all circuitry in the
device is disabled. All programmed information is lost
when the enable bit is subsequently pulled high.
VASEL Pin
The VASEL pin sets the default voltage of LDO A, the
core supply. When this pin is set to VIN, the default volt-
age is 2.80V. When this pin is set to GND, the default
voltage is 1.80V. The voltage can be changed from its
default state after start up by writing to the LDO voltage
code register.
Device Addressing
Following a start condition, the master must output the
address of the slave it is accessing. The most significant
six bits of the slave are the device type identifier (ID).
For the SC900 this is fixed at 000100[B]. The next sig-
nificant bit addresses a particular device. A system can
have up to two SC900 devices on the bus. The two
addresses are defined by the state of the A0 input (see
Figure 1).
DEVICE TYPE IDENTIFIER
DEVICE ADDRESS R/W
0 0 0 1 0 0 Pin A0 to GND = 0 X
Pin A0 to VIN = 1
When the A0 pin is tied to GND, device 1 has an address
of 0 and the combination of device type ID and address
is 0x08H. When the A0 pin is tied to VIN, device 2 has
and address of 1 and the combination of device type ID
and address is 0x09H.
The last bit of the slave address defines the operation to
be performed. When set to a one a read operation is
selected; when set to a zero a write operation is selected.
Following a start condition, the SC900 monitors the SDA
line comparing the slave address being transmitted with
its slave address (device type ID and state of A0 input).
Upon a correct compare the SC900 outputs an acknowl-
edge on the SDA line. Depending on the state of the R/
W bit, the SC900 will execute a read or write operation.
Protection Circuitry
The SC900 provides protection circuitry that prevents
the device from operating in an unspecified state. These
include Under-voltage Lockout Protection, Over-tempera-
ture Protection and Short-circuit Protection.
Under Voltage Lockout
The SC900 provides an Under Voltage Lockout (UVLO)
circuit to protect the device from operating in an unknown
state if the input voltage supply is too low. When the
battery voltage drops below the UVLO threshold, the LDOs
are disabled. As the battery voltage increases above
the hysteresis level, the LDOs are re-enabled into their
previous states, provided ENABLE has remained high. If
ENABLE goes low, the SC900 will shut down.
Over-temperature Protection
The SC900 provides an internal Over-temperature (OT)
protection circuit that monitors the internal junction tem-
perature. When the temperature exceeds the OT thresh-
old, the OT protection disables all the LDO outputs. As
the junction temperature drops below the hysteresis level
the OT protection re-enables all the LDOs in their previ-
ous states, provided ENABLE has remained high. If EN-
ABLE goes low, the SC900 will shut down.
Short-circuit Protection
Each LDO output has short-circuit protection. If a short
is applied to any output, the output voltage will drop and
the output current will be limited to the short circuit cur-
rent until the short is removed.
Figure 1 - Slave Address Structure
2005 Semtech Corp.
11
www.semtech.com
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet SC900.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| SC900 | Programmable Penta ULDO | Semtech Corporation |
| SC900A | Programmable Penta ULDO |  Semtech |
| SC9012 | INFRARED REMOTE CONTROL TRANSMITTER |  Silan Semiconductors |
| SC9016-000 | (SC9016-000 / SC9017-000) Fet Chip Mounting Capacit |  Alpha |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |