sc1417bimstr Semtech Corporation, sc1417bimstr Datasheet

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sc1417bimstr

Manufacturer Part Number
sc1417bimstr
Description
Sc1417b Micropower, 620 Khz Pwm, Step-up Dc/dc Converter
Manufacturer
Semtech Corporation
Datasheet

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The SC1417B is a fixed frequency, current mode step-up
dc-dc converter. It operates over a wide input supply range
of 1.5V to 12V, making it suitable for battery input and
TFT-LCD applications. The 620kHz constant frequency
oscillator minimizes the size of external components and
allows simple filtering for noise sensitive environments.
The integrated power NPN supports peak currents of up
to 0.9A enabling the device to support 150mA at 15V
from a 5V supply. The maximum switch duty cycle of
85% (typical) allows output to input voltage ratios as high
as 6.5 in step-up configurations, thus allowing 2V to 12V
boost operation.
The SC1417B features a low battery detector and a
200mV reference circuit which remains active during shut
down. The part consumes less than 50µA in shutdown.
The low battery detect output goes low when the input
battery voltage has dropped below a user programmable
level. Pulse-by-pulse current limit and thermal shutdown
protect the converter during load faults.
The SC1417B is available in a MSOP-8 surface mount
package.
Revision: August 1, 2006
POWER MANAGEMENT
Description
Typical Application Circuit
(Alkaline)
2 Cells
47uF
C1
R2
1M
R6
130k
R3
1M
6
7
3
1
R5
33k
C3
3.3nF
U1
IN
LBI
EN
COMP
L1
10uH
1
SC1417B
Features
Applications
GND
Operates from 1.5V to 12V supply voltage
High efficiency >85%
150mA @ 15V from 5V input
Internal switch peak current of 0.9A
Programmable output voltage
Powers up into full load
Pulse-by-pulse current limit/thermal shutdown
620kHz fixed frequency current mode converter
Low current shutdown mode extends battery life
18V output capability
Low battery detector
MSOP-8 package. Available in Lead-free package,
fully WEEE and RoHS compliant
Pin-for-pin compatible with LT1317B
TFT-LCD Bias supplies
Constant current LED bias supplies
Pagers
GPS receivers
Battery backup
SEPIC converters
LBO
FB
LX
5
2
4
8
MicroPower, 620kHz PWM,
SMB5819
D1
Step-up DC/DC Converter
R1
1.0M
R4
604k
C2
47uF
3.3V@250mA
LBO OUT
V
OUT
SC1417B
. 1
www.semtech.com
22
1 (
R
R
1
4
)

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sc1417bimstr Summary of contents

Page 1

POWER MANAGEMENT Description The SC1417B is a fixed frequency, current mode step-up dc-dc converter. It operates over a wide input supply range of 1.5V to 12V, making it suitable for battery input and TFT-LCD applications. The 620kHz constant frequency oscillator ...

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 Unless otherwise specified 25°C. Values in bold apply over full operating ambient temperature range respect to ground, -ve indicates current is flowing out of the pin ...

Page 4

POWER MANAGEMENT Pin Configuration TOP VIEW COMP GND 4 (MSOP-8) Pin Descriptions ...

Page 5

POWER MANAGEMENT Block Diagram 1.22V REFERENCE FB SLOPE COMP LBO LBM 200mV Marking Information Marking for MSOP-8 package yyww = Date Code (Example: 0012) xxxxxxxx = Semtech Lot No. (Example: E90101-1) 2006 Semtech Corp. COMP IN ERROR AMP COMP PWM ...

Page 6

POWER MANAGEMENT Typical Characteristics Feedback Voltage vs. Temperature 1.250 1.245 V = 600mV COMP LX floating 1.240 1.235 1.230 1.225 1.220 1.215 1.210 1.205 1.200 -50 - (°C) A Supply ...

Page 7

POWER MANAGEMENT Typical Characteristics (Cont.) Internal Oscillator Frequency vs. Temperature 670 V = 3.6V IN 660 OUT I = 20mA 650 OUT 640 630 620 610 600 590 580 570 -50 - (°C) A ...

Page 8

POWER MANAGEMENT Typical Characteristices (Cont Scope plot of Boost Converter waveforms in Constant Brightness LED driver Vin = 3V, Vout = 11.9V, Iout = 40mA 15uH Cin = 10uF, 6.3V tant. ...

Page 9

POWER MANAGEMENT Typical Application Circuits VIN 22uF,6.3V R6 130k C6 10nF GND Figure 1 - Constant Brightness LED driver with 12V compliance from 2-cells (constant current output) VIN = 10uF,6.3V R6 ...

Page 10

POWER MANAGEMENT Outline Drawing - MSOP E/2 PIN 1 INDICATOR ccc N/2 TIPS aaa C SEATING PLANE C SIDE VIEW NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. DATUMS -A- ...

Page 11

... COMPANY'S MANUFACTURING GUIDELINES ARE MET. Contact Information Phone: (805) 498-2111 FAX (805)498-3804 2006 Semtech Corp. DIM INCHES (.161 .098 .026 X .016 Y .063 Z .224 Y Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 Visit us at: www.semtech.com 11 SC1417B DIMENSIONS MILLIMETERS (4.10) 2.50 0.65 0.40 1.60 5.70 www.semtech.com ...

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