sc1457isk-1.5tr Semtech Corporation, sc1457isk-1.5tr Datasheet

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sc1457isk-1.5tr

Manufacturer Part Number
sc1457isk-1.5tr
Description
Sc1457 150 Ma Ultra-low Dropout Regulator With Undervoltage Flag
Manufacturer
Semtech Corporation
Datasheet

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SC1457ISK-1.5TR
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Semtech
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12 000
The SC1457 is a low dropout linear regulator that
operates from a +2.25V to +6.5V input range and
delivers up to 150mA. A PMOS pass transistor allows
the low 75µA supply current to remain independent of
load, making these devices ideal for battery operated
portable equipment such as cellular phones, cordless
phones and personal digital assistants.
The SC1457 has very low dropout voltage (typically 1.1mV
at light loads and 150mV at 150mA) with better than
1.5% initial output voltage accuracy. It has a logic
compatible enable control input and an internal output
undervoltage monitor.
Designed especially for hand held, battery powered
devices, the SC1457 can be switched by a CMOS or TTL
compatible logic signal. When disabled, power
consumption drops nearly to zero. Other features include
short circuit protection, thermal shutdown protection and
reverse battery protection.
The SC1457 is available in several fixed voltages in the
tiny 5 lead SOT-23 package and the ultra low profile 5
lead TSOT-23.
Revision: November 10, 2004
POWER MANAGEMENT
Description
Typical Application Circuit
VIN
C1
1uF
1
3
U1
IN
EN
GND
2
SC1457
OUT
FLG
5
4
1
Features
Applications
Regulator with Undervoltage Flag
R1 100k
Guaranteed 150mA output current
Error flag indicates output undervoltage fault
2% output accuracy guaranteed over line, load and
temperature
Very small external components - designed to work
with ceramic capacitors
Low 110µV
Very low supply current
Thermal overload protection
Reverse battery protection
Low power shutdown
Full industrial temperature range
Very low profile packaging available (1mm max.
height)
Surface mount packaging (SOT-23-5 and
Battery Powered Systems
Cellular Telephones
Cordless Telephones
Personal Digital Assistants
Portable Instrumentation
Modems
PCMCIA cards
TSOT-23-5)
150mA Ultra Low Dropout
RMS
output noise
C2
1uF
VO
UNDERVOLTAGE FLAG
www.semtech.com
SC1457

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sc1457isk-1.5tr Summary of contents

Page 1

POWER MANAGEMENT Description The SC1457 is a low dropout linear regulator that operates from a +2.25V to +6.5V input range and delivers up to 150mA. A PMOS pass transistor allows the low 75µA supply current to remain independent of load, ...

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 (Cont.) Unless specified 1V OUT ...

Page 4

POWER MANAGEMENT Pin Configuration Top View (SOT-23-5 & TSOT-23-5) Block Diagram Pin Descriptions ...

Page 5

POWER MANAGEMENT Marking Information Top Mark x7XX x = package (5 for SOT-23-5, T for TSOT-23- SC1457 XX = voltage option (examples: 5731 for 3.1V option in SOT-23-5, T728 for 2.8V option in TSOT-23-5) Applications Information Theory Of ...

Page 6

... D ( MAX ) 2004 Semtech Corp. With the standard SOT-23-5/TSOT-23-5 Land Pattern shown at the end of this datasheet, and minimum trace widths, the thermal impedance junction to ambient for SC1457ISK is 256°C/W. Thus no additional heatsinking is required for this example. ( MAX ) ...

Page 7

POWER MANAGEMENT Typical Characteristics Quiescent Current vs. Junction Temperature vs. Input Voltage 120 I = 150mA OUT 100 -50 - (°C) J Output Voltage vs. Junction Temperature vs. Output Current 0.00 ...

Page 8

POWER MANAGEMENT Typical Characteristics (Cont.) Dropout Voltage vs. Junction Temperature vs. Output Current 200 175 150 125 100 -50 - (°C) J Enable Input Threshold Voltage vs. Junction Temperature vs. Input Voltage ...

Page 9

POWER MANAGEMENT Typical Characteristics (Cont.) Reverse Battery Protection vs. Junction Temperature 5 -6. 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 -50 - (°C) J 2004 Semtech Corp. ...

Page 10

POWER MANAGEMENT Evaluation Board Schematic J2 IN MON J10 J11 J12 J13 J14 J15 GND GND GND GND GND GND Evaluation Board Bill of Materials ...

Page 11

POWER MANAGEMENT Evaluation Board Gerber Plots Top Copper ...

Page 12

POWER MANAGEMENT Outline Drawing - SOT-23-5 2X E/2 ccc C 2X N/2 TIPS aaa C SEATING PLANE C NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. DATUMS -A- AND 3. DIMENSIONS "E1" AND "D" DO NOT INCLUDE ...

Page 13

... Phone: (805)498-2111 FAX (805)498-3804 2004 Semtech Corp. DIMENSIONS DIMENSIONS DIM DIM INCHES INCHES (.098 .055 .037 X X .024 .043 Z Z .141 Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 13 SC1457 MILLIMETERS MILLIMETERS (2.50) 1.40 0.95 0.60 1.10 3.60 www.semtech.com ...

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