SC900A Datasheet PDF - Semtech
| Part Number | SC900A | |
| Description | Programmable Penta ULDO | |
| Manufacturers | Semtech | |
| Logo |  |
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POWER MANAGEMENT
Description
SC900A
Programmable Penta ULDO
with RESET anwdwwI.D2aCtaSIhneette4Ur.cfoamce
Features
The SC900A is a highly integrated power management de-
vice for low power portable applications. The device con-
tains 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 SC900A are programmable through
the I2C interface. These include the ability to independent-
ly 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 for LDOs A and B, and from
1.75V to 3.30V for LDOs C, D and E. 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.
The SC900A offers significant quiescent current and
space savings to the system designer by sharing refer-
ence and biasing among five LDOs. The small and ther-
mally efficient 20-lead MLPQ package make it ideal for
use in portable products where minimizing layout area is
critical.
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 LDOs A and B
1.75V to 3.30V for LDOs C, D and E
Applications
Palmtop/Laptop computers
Personal Digital Assistants
Cellular telephones
Battery-powered equipment
High efficiency linear power supplies
Typical Application Circuit
+
-
VBAT
4.7uF
SC900A
VIN
INA
INB
INCD
INE
EN
LDOPGD
ARST
SDA
SCL
A0
GND
LDOE
LDOD
LDOA
LDOB
LDOC
VREF
VASEL
DGND
2.2uF 2.2uF 2.2uF
0.1uF
Keypad
Baseband
Processor
Audio
Processing
Digital
Interface
2.2uF
2.2uF
Receiver
Section
LNA
TCXO
&
Synthesiser
Transmitter
Section
PA
Camera
Processing
CCD
November 14, 2005
1
www.semtech.com
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SC900A
POWER MANAGEMENT
Electrical Characteristics (Cont.)
www.DataSheet4U.com
Parameter
Symbol
Conditions
Min
LDO Regulator D (Cont.)
Maximum Output Current
Default Setting: OFF
Line Regulation at 3.10V
Load Regulation at 3.10V
Dropout Voltage
Power Supply Rejection Ratio
Output Voltage Noise(2)
LDO Regulator E
IOMAXD
VOD
LINEREGD
LOADREGD
VDD
PSRRD
en-D
IOUT = 1mA, VOUT + 0.15V < VIN < 5.5V
1mA < IOUT <150mA
VOUT = 3.3V, IOUT = 150mA
f = 10Hz - 1kHz, CBYP = 0.1mF,
IOUT = 50mA,
2.5V ≤ VOUT ≤ 3.3V
f = 10Hz - 100kHz, IOUT = 50mA,
CVREF = 0.1μF, COUT = 2.2μF,
2.5V ≤ VOUT ≤ 3.3V
Output Voltage Accuracy
Output Voltage Accuracy at
3.10V (DAC = 10111)
Maximum Output Current
Default Setting: OFF
Line Regulation at 3.10V
Load Regulation at 3.10V
VOAE
VOASE
IOMAXE
VOE
LINEREGE
LOADREGE
1.75V ≤ VOUT ≤ 3.30V
VOUT + 0.15V ≤ VIN ≤ 5.5V
IOUT = 1mA, TA = 25°C
IOUT = 1mA
VOUT + 0.5V ≤ VIN ≤ 5.5V,
IOUT = 150mA
IOUT = 1mA, VOUT + 0.15V < VIN < 5.5V
1mA < IOUT = 150mA
Dropout Voltage
Power Supply Rejection Ratio
VDE
PSRRE
Output Voltage Noise(2)
A RESET
en-E
VOUT = 3.3V, IOUT = 150mA
f = 10Hz - 1kHz, CBYP = 0.1μF,
IOUT = 50mA,
2.5V ≤ VOUT ≤ 3.3V
f = 10Hz - 100kHz, IOUT = 50mA,
CVREF = 0.1μF, COUT = 2.2μF,
2.5V ≤ VOUT ≤ 3.3V
Reset Threshold
Reset Active Timeout Delay
RESETTHLD
tRD
Delay in default state
LDO POWER GOOD
PGOOD Threshold
PGOODTHLD
PGOOD Active Timeout Delay
tPG
Delay in default state
Notes:
1) Digital outputs are powered from LDOB, so LDOB must be active for operation of LDOPGD and ARST.
2) Below 2.5V: becomes digital regulator.
© 2005 Semtech Corp.
5
150
-3
-2
-3.5
150
75
75
Typ
3.10
2.5
-3
150
60
55
3.10
2.5
-3
150
60
55
77
100
77
100
Max Units
mA
V
12 mV
-20 mV
190 mV
dB
μVRMS
+3 %
+2 %
+3.5 %
mA
V
12 mV
-20 mV
190 mV
dB
μVRMS
%
125 ms
%
125 ms
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| Information | Total 23 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ SC900A.PDF Datasheet ] | |
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