SC1452GIMSTR Semtech, SC1452GIMSTR Datasheet

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SC1452GIMSTR

Manufacturer Part Number
SC1452GIMSTR
Description
IC, DUAL LDO VOLT REG, 1.8V/3V, MSOP-10
Manufacturer
Semtech
Datasheet

Specifications of SC1452GIMSTR

Primary Input Voltage
6.5V
Output Voltage Fixed
3V
Dropout Voltage Vdo
155mV
No. Of Pins
10
Output Current
150mA
Operating Temperature Range
-40°C To +85°C
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
The SC1452 is a state of the art device intended to
provide maximum performance and flexibility in battery
operated systems. It has been designed specifically to
fully support a single Li-Ion battery and its external charger
voltages.
The SC1452 contains two independently enabled, 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 which are
designed to provide an initial tolerance of ±1% and ±2%
over temperature.
Each regulator has an associated active-low reset signal
which is asserted when the voltage output declines
below the preset threshold. Once the output recovers,
the reset continues to be asserted (delayed) for a
predetermined time, 50ms for reset A and 150ms for
reset B. In the case of regulator B, the delay time may be
reduced by the addition of an external capacitor.
The SC1452 has a bypass pin to enable the user to
capacitively decouple the bandgap reference for very low
output noise (down to 50µVrms).
The devices utilize CMOS technology to achieve very low
operating currents (typically 130uA with both
outputs supplying 150mA). The dropout voltage is
typically 155mV at 150mA, helping to prolong battery
life. In addition, the devices are guaranteed 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 SC1452 comes in the low profile 10-lead MSOP
package.
Revision: September 20, 2006
POWER MANAGEMENT
Description
Typical Application Circuit
3.0V OUT
2.5V OUT
RESET A
RESET B
COUTA
1uF
COUTB
1uF
NOT RECOMMENDED FOR NEW DESIGN
1
2
3
4
5
OUTA
OUTB
GND
RSTA
RSTB
U1
SC1452FIMS
DLYB
ENA
BYP
ENB
IN
1
Features
Applications
10
9
8
7
6
Up to 150mA per regulator output
Low quiescent current (130
outputs at 150mA)
Low dropout voltage
Wide selection of output voltages
Stable operation with ceramic caps
Tight load and line regulation
Current and thermal limiting
Reverse input polarity protection
<1
Logic controlled enable
Active low resets valid for V
Programmable reset
Full industrial temperature range
10-Pin MSOP package. Also available in Lead-free,
fully WEEE and RoHS compliant
Cellular telephones
Palmtop/Laptop computers
Battery-powered equipment
Bar code scanners
SMPS post regulator/dc to dc modules
High efficiency linear power supplies
DSP supplies
µ
A off-mode current
Dual 150mA LDO Regulator
CBYP
10nF
with Programmable Reset
CDLYB
10nF
µ
IN
A typical with both
down to 0V
CIN
1uF
3.3V IN
ENABLE OUTPUT A
ENABLE OUTPUT B
SC1452
www.semtech.com

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SC1452GIMSTR Summary of contents

Page 1

... SMPS post regulator/ modules High efficiency linear power supplies DSP supplies OUTA OUTB ENA 3 8 GND BYP 4 7 RSTA ENB 5 6 RSTB DLYB SC1452FIMS CBYP 10nF 1 SC1452 A typical with both µ down 3.3V IN ENABLE OUTPUT A ENABLE OUTPUT B CDLYB CIN 10nF 1uF www.semtech.com ...

Page 2

... Electrical Characteristics section is not implied. Exposure to Absolute Maximum rated conditions for extended periods of time may affect device reliability Electrical Characteristics Unless specified 25° 1V OUT Values in bold apply over full operating temperature range 2006 Semtech Corp 1mA 1.0 µ OUTA OUTB IN OUT ENA SC1452 ENB ...

Page 3

... NOT RECOMMENDED FOR NEW DESIGN POWER MANAGEMENT Electrical Characteristics (Cont.) Unless specified 25° 1V OUT Values in bold apply over full operating temperature range 2006 Semtech Corp 1mA 1.0 µ OUTA OUTB IN OUT ENA µ µ < SC1452 = V . ENB www.semtech.com µ µ µ A ...

Page 4

... Defined as the input to output differential at which the output drops 100mV below the value measured at a differential of 1V. Not measurable on 1.5V and 1.8V outputs due to minimum V (3) Guaranteed by design. (4) V will be a percentage of V OHA Timing Diagrams 2006 Semtech Corp 1mA 1.0 µ OUTA ...

Page 5

... Only available in tape and reel packaging. A reel contains 2500 devices. (3) Lead-free product. This product is fully WEEE and RoHS compliant. Pin Descriptions 2006 Semtech Corp. Voltage Options Replace X in the part number (SC1452XIMS) by the letter shown below for the corresponding voltage option ...

Page 6

... NOT RECOMMENDED FOR NEW DESIGN POWER MANAGEMENT Block Diagram Marking Information 2006 Semtech Corp Voltage options (Example: 452F) yyww = Datecode (Example: 0008) XXXX = Lot Number (Example: E01102) 6 SC1452 www.semtech.com ...

Page 7

... The current limit is guaranteed to be greater than 400mA to allow fast charging of the output capacitor and high 2006 Semtech Corp. initial currents for DSP initialization. The SC1452 has a fast start-up circuit to speed up the initial charging time of the bypass capacitor to enable the output voltage to come up quicker ...

Page 8

... Increasing the bulk capacitance will further reduce output noise and improve the overall transient response. Input capacitor - Semtech recommends the use of a 1µF ceramic capacitor at the input. This allows for the device being some distance from any bulk capacitance on the rail ...

Page 9

... Output Voltage vs. Output Current vs. Junction Temperature - OUT - (mA) OUT Dropout Voltage vs. Output Current vs. Junction Temperature 200 175 150 125 100 (mA) OUT 2006 Semtech Corp. Enable Input Voltage vs. Junction Temperature 1.6 1 1 0.6 0.4 -50 Output Voltage vs. Junction Temperature 25° -40° - 125° -12 100 125 150 -50 Dropout Voltage vs ...

Page 10

... 0.55 0.50 0.45 0.40 -50 - (°C) J Quiescent Current vs. Junction Temperature vs. Output Current 200 OUTA OUTB 175 150 125 100 -50 - (°C) J 2006 Semtech Corp OUT 6.5V IN OUT 5.5V IN OUT 100 125 -50 400 V V 350 300 250 200 150 100 100 125 -50 Quiescent Current vs ...

Page 11

... OUT V = 2.5V 1 OUT V = 1.8V OUT OUT I = 50mA 0.1 OUT C = 1µ 10nF BYP C = 2.2µF OUT T = 25°C J 0.01 0.01 0 (kHz) 2006 Semtech Corp 6. 100 125 -50 Delay Source Current and Voltage Threshold 4 6.5V V OUT IN OUT 3.8 3.6 3.4 3.2 3.0 2.8 2 ...

Page 12

... 1µF OUT IN OUT 10nF 35 OUT BYP 1mA OUT OUT 25° 0.01 0 (kHz) 2006 Semtech Corp. Output Spectral Noise Density vs. Frequency 1.8V OUT 50mA OUT 1µ 2.2µF OUT T = 25°C J 0.1 0.01 0.001 10 100 1000 0.01 PSRR vs. Frequency vs. Output Voltage ...

Page 13

... Si4410 Si4410 Evaluation Board Gerber Plots Top Copper 2006 Semtech Corp. J4 RIPPLE OUTA OUTB ENA 3 8 GND BYP 4 7 RSTA ENB 5 6 RSTB DLYB SC1452xIMS C2 C3 JP3 2.2uF 2.2uF MON J10 OUTB LOAD DRV NOTE: (1) See table below for resistor values ...

Page 14

... NOT RECOMMENDED FOR NEW DESIGN POWER MANAGEMENT Evaluation Board Gerber Plots (Cont.) Top Silk Screen Evaluation Board Bill of Materials 2006 Semtech Corp µ µ µ SC1452 www.semtech.com ...

Page 15

... REFERENCE JEDEC STD MO-187, VARIATION BA. Land Pattern - MSOP-10 (C) NOTES: 1. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET. Contact Information Phone: (805)498-2111 FAX (805)498-3804 2006 Semtech Corp. e INCHES DIM A MIN NOM MAX MIN ...

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