sc900imltrt Semtech Corporation, sc900imltrt Datasheet

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sc900imltrt

Manufacturer Part Number
sc900imltrt
Description
Sc900 Programmable Penta Uldo With Reset And I2c Interface
Manufacturer
Semtech Corporation
Datasheet
March 29, 2005
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, I
voltages.
Many features of the SC900 are programmable through
the I
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.
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.
POWER MANAGEMENT
Description
Typical Application Circuit
2
C interface. These include the ability to indepen-
VBAT
2
4.7µF
C interface, and DACs to control the output
VIN
INA
INB
INCD
INE
EN
LDOPGD
ARST
SDA
SCL
A0
GND
SC900
VASEL
DGND
LDOA
LDOB
LDOC
LDOE
LDOD
VREF
2.2µF
0.1µF
2.2µF
Keypad
2.2µF
Processing
Audio
Digital Interface
1
Baseband
Processor
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Features
Applications
Programmable Penta ULDO with
Five LDO regulators in one package
I
Independent I
Independent I
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 V
Palmtop/Laptop computers
Personal Digital Assistants
Cellular telephones
Battery-powered equipment
High efficiency linear power supplies
each LDO
2
C interface with multiple device capability
2.2µF
RESET and I
Synthesizer
2
Transmitter
2
Receiver
Section
C enable/disable of LDOs
C control of output voltages
Section
TXCO
OUT
2.2µF
&
range - 1.45V to 3.00V for
LNA
PA
2
C Interface
www.semtech.com
SC900

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sc900imltrt Summary of contents

Page 1

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 interface, and ...

Page 2

POWER MANAGEMENT Absolute Maximum Ratings Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not implied ...

Page 3

POWER MANAGEMENT Electrical Characteristics (Cont.) Unless otherwise noted 3.7V ...

Page 4

POWER MANAGEMENT Electrical Characteristics (Cont.) Unless otherwise noted 3.7V ...

Page 5

POWER MANAGEMENT Electrical Characteristics (Cont.) Unless otherwise noted: VIN = 3.7V VIN ...

Page 6

POWER MANAGEMENT Electrical Characteristics (Cont.) Unless otherwise noted 3.7V ...

Page 7

POWER MANAGEMENT Pin Configuration LDOB 1 TOP VIEW INB 2 SDA 3 SCL MLPQ20: 4X4 20 LEAD 2005 Semtech Corp. Ordering Information ...

Page 8

POWER MANAGEMENT Pin Description ...

Page 9

POWER MANAGEMENT Block Diagram INA INB INB VIN EN I2C Interface en VASEL vasel SCL scl SDA sda A0 a0 VOB ARST LDOPGD INCD INE 2005 Semtech Corp. Reference DACs DAC A en DAC B DAC C DAC D DAC ...

Page 10

POWER MANAGEMENT Applications Information General Description Each of the five low-dropout linear regulators (LDOs) can be independently enabled or disabled and their output voltages can each be set by an independent DAC. These controls can be accessed through the I ...

Page 11

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 ...

Page 12

POWER MANAGEMENT Applications Information (Cont.) Layout Considerations Layout is straightforward if you use the Gerber files on page reference. Notice that the input voltage feed to the SC900 is on the bottom of the board and vias ...

Page 13

POWER MANAGEMENT Applications Information (Cont.) Output Voltage Code Bits: A 5-bit linear DAC controls the output voltage of each LDO. The DAC and error-amp gain are scaled so that the LSB size at the output is 50mV. Output voltage can ...

Page 14

POWER MANAGEMENT Applications Information (Cont.) Supported Formats Direct Format - Write The simplest format for write is the direct format. After the start condition [S], the slave address is sent, 2 followed by an eighth bit indicating ...

Page 15

POWER MANAGEMENT Applications Information (Cont.) Stop Separated Reads Another read format is available which is, in effect, an extension of the combined format read. This format allows a master to set up the register address pointer for a read and ...

Page 16

POWER MANAGEMENT Timing Diagrams LDO OUTA V ARST 90% V LDO & OUT TH V LDOPGD 90% V LDO On/Off Control via the I STOP SCL SDA V LDOn 40us 2005 ...

Page 17

POWER MANAGEMENT Timing Diagram Default Start-Up, Shut-Down Timing Diagram Enable VREF LDO A LDO B LDO C LDO D LDO E ARST LDOPGD 15ms 2005 Semtech Corp. 100ms 17 SC900 200us 100ms 15ms www.semtech.com ...

Page 18

POWER MANAGEMENT Typical Characteristics Dropout Voltage (LDOA) 180 160 140 T = 85°C A 120 100 100 Load Current (mA) Load Regulation (LDOA- 25° 3. ...

Page 19

POWER MANAGEMENT Typical Characteristics Line Transient V = 3.7V 100mA IN 100µs/div 2005 Semtech Corp. Load Transient (LDOA- 3.7V 10mA to 150mA step 500mV/div Vo 10mV/div 19 SC900 Vo 20mV/div Io ...

Page 20

POWER MANAGEMENT Evaluation Board R1 150 D1 LDOPGD Q1 FMMT3904 +5V EXTRNAL 10uF EXTERNAL SUPPLY SC900 PWR SW1 R12 R13 R14 R15 C11 SC900 Power Select 150 150 100K 100K 0.1uF BOARD D4 D5 EXTERNAL USB ...

Page 21

POWER MANAGEMENT Evaluation Board Gerbers Top Gerber Bottom Gerber 2005 Semtech Corp. Top Silk Screen Gerber Bottom Silk Screen Gerber 21 SC900 www.semtech.com ...

Page 22

POWER MANAGEMENT Outline Drawing - MLPQ-20L PIN 1 INDICATOR (LASER MARK) A aaa C E1 NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). COPLANARITY APPLIES TO THE EXPOSED PAD AS WELL AS THE TERMINALS. 2. ...

Page 23

... COMPANY'S MANUFACTURING GUIDELINES ARE MET. Contact Information Phone: (805) 498-2111 FAX (805)498-3804 2005 Semtech Corp. DIM Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 Visit us at: www.semtech.com 23 SC900 DIMENSIONS INCHES MILLIMETERS (.155) (3.95) .122 3.10 .106 2.70 ...

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