SC1454XIMSTRT SEMTECH [Semtech Corporation], SC1454XIMSTRT Datasheet

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SC1454XIMSTRT

Manufacturer Part Number
SC1454XIMSTRT
Description
Dual 150mA Ultra Low Dropout, Low Noise Regulator
Manufacturer
SEMTECH [Semtech Corporation]
Datasheet
The SC1454 contains two ultra low dropout voltage
regulators (ULDOs). It operates from an input voltage
range of 2.25V to 6.5V, and a wide variety of output
voltage options are available. One ULDO has a fixed
output, and the other is either fixed (SETA pin grounded)
or adjustable using external resistors. Each ULDO has an
independent enable pin.
The SC1454 has a bypass pin to enable the user to
capacitively decouple the bandgap reference for very low
output noise (50µV
Designed specifically for battery operated systems, the
devices utilize CMOS technology to require very low
operating currents (typically 130µA with both outputs
supplying 150mA). In addition, the dropout voltage is
typically 155mV at 150mA, helping to prolong battery
life further. The devices are designed to provide 400mA
of peak current for applications which require high initial
inrush current.
They have been designed to be used with low ESR
ceramic capacitors to save cost and PCB area.
The SC1454 is available with a wide variety of voltage
options as standard. It comes in the tiny 8 lead MSOP
surface mount package.
POWER MANAGEMENT
Description
Typical Application Circuit
Revision: May 4, 2005
OUTPUT A: 2.5V
OUTPUT B: 2.8V
OUTPUT A: 3.0V
OUTPUT B: 3.0V
RMS
typically).
C1
1uF
C1
1uF
C2
1uF
C2
1uF
R1
100k
R2
100k
1
2
3
4
U1 SC1454DIMS
OUTA
OUTB
GND
SETA
1
1
2
3
4
Features
Applications
U1 SC1454CIMS
OUTA
OUTB
GND
SETA
Up to 150mA per regulator output
Low quiescent current
Low dropout voltage
Stable operation with ceramic caps
Very low 50µV
Wide selection of output voltages
Tight load and line regulation
Current and thermal limiting
Reverse input polarity protection
<1.5uA off-mode current
Logic controlled enable
Cellular telephones
Palmtop/Laptop computers
Battery-powered equipment
Bar code scanners
SMPS post regulator/dc to dc modules
High efficiency linear power supplies
ENA
BYP
ENB
IN
Dropout, Low Noise Regulator
8
7
6
5
ENA
BYP
ENB
IN
8
7
6
5
C3
10nF
RMS
Dual 150mA Ultra Low
output noise
C3
10nF
C4
1uF
VIN
ENABLE OUTPUT A
ENABLE OUTPUT B
C4
1uF
VIN
ENABLE OUTPUT A
ENABLE OUTPUT B
SC1454
www.semtech.com

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SC1454XIMSTRT Summary of contents

Page 1

POWER MANAGEMENT Description The SC1454 contains two ultra low dropout voltage regulators (ULDOs). It operates from an input voltage range of 2.25V to 6.5V, and a wide variety of output voltage options are available. One ULDO has a fixed output, ...

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. Exposure to Absolute Maximum rated conditions ...

Page 3

POWER MANAGEMENT Electrical Characteristics Unless specified 25° 1V OUT Values in bold apply over full operating temperature range ...

Page 4

POWER MANAGEMENT Pin Configuration TOP VIEW OUTA 1 8 OUTB 2 7 GND 3 6 SETA 4 5 (MSOP-8) Ordering Information ...

Page 5

POWER MANAGEMENT Block Diagram Marking Information 2005 Semtech Corp Voltage option (Example: 454F) yyww = Datecode (Example: 0008) XXXX = Lot number (Example: E90101-1) 5 SC1454 www.semtech.com ...

Page 6

POWER MANAGEMENT Applications Information Theory Of Operation The SC1454 is intended for applications where very low dropout voltage, low supply current and low output noise are critical. Furthermore, the SC1454, by combining two PIN Descriptions ultra low dropout (ULDO) regulators, ...

Page 7

POWER MANAGEMENT Applications Information (Cont.) R1 and R2 should be selected such that the current flowing through them is 10µA (thus R2 Thermal Considerations The worst-case power dissipation for this part is given by ...

Page 8

POWER MANAGEMENT Typical Characteristics Output Voltage vs. Output Current vs. Junction Temperature 3. 2.8V OUT 5.0 2.5 0.0 -2.5 -5.0 -7.5 -10 (mA) OUT Output Voltage vs. ...

Page 9

POWER MANAGEMENT Typical Characteristics (Cont.) Dropout Voltage vs. Output Current vs. Junction Temperature 200 175 150 125 100 (mA) OUT Line Regulation vs. Junction Temperature 1mA OUT 9 ...

Page 10

POWER MANAGEMENT Typical Characteristics (Cont.) Quiescent Current vs. Junction Temperature vs. Output Current 200 V = 6.5V IN 175 150 125 100 -50 - (°C) J Enable Input Voltage vs. Junction Temperature ...

Page 11

POWER MANAGEMENT Typical Characteristics (Cont.) Output Spectral Noise Density vs. Frequency vs. Output Capacitance 1.8V OUT V = 2.8V Left to right 50mA OUT OUT 0. 10nF OUT ...

Page 12

POWER MANAGEMENT Evaluation Board Schematic J4 RIPPLE OUTA J7 OUTB C1 EXT INT Si4410 ...

Page 13

POWER MANAGEMENT Evaluation Board Gerber Plots (Cont.) Top Assembly Evaluation Board Bill Of Materials ...

Page 14

POWER MANAGEMENT Outline Drawing - MSOP-8 2X E/2 PIN 1 INDICATOR ccc C 2X N/2 TIPS aaa C SEATING PLANE C NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. DATUMS -A- 3. DIMENSIONS "E1" AND "D" DO ...

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