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DC/DC Converter. SC1417B Datasheet

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DC/DC Converter. SC1417B Datasheet






SC1417B Converter. Datasheet pdf. Equivalent




SC1417B Converter. Datasheet pdf. Equivalent





Part

SC1417B

Description

Step-up DC/DC Converter



Feature


MicroPower, 620kHz PWM, www.DataSheet4U. com Step-up DC/DC Converter POWER MANAG EMENT Description The SC1417B is a fixe d frequency, current mode step-up dc-dc converter. It operates over a wide inp ut supply range of 1.5V to 12V, making it suitable for battery input and TFT-L CD applications. The 620kHz constant fr equency oscillator minimizes the size o f external compone.
Manufacture

Semtech

Datasheet
Download SC1417B Datasheet


Semtech SC1417B

SC1417B; nts and allows simple filtering for nois e sensitive environments. The integrate d power NPN supports peak currents of u p to 0.9A enabling the device to suppor t 150mA at 15V from a 5V supply. The ma ximum switch duty cycle of 85% (typical ) allows output to input voltage ratios as high as 6.5 in step-up configuratio ns, thus allowing 2V to 12V boost opera tion. The SC1417B .


Semtech SC1417B

features a low battery detector and a 20 0mV reference circuit which remains act ive during shut down. The part consumes less than 50µA in shutdown. The low b attery detect output goes low when the input battery voltage has dropped below a user programmable level. Pulse-by-pu lse current limit and thermal shutdown protect the converter during load fault s. The SC1417B is a.


Semtech SC1417B

vailable in a MSOP-8 surface mount packa ge. SC1417B Features ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ Operates from 1.5V to 12V supply voltage High efficiency > 85% 150mA @ 15V from 5V input Internal switch peak current of 0.9A Programmabl e output voltage Powers up into full lo ad Pulse-by-pulse current limit/thermal shutdown 620kHz fixed frequency curren t mode converter Low current s.

Part

SC1417B

Description

Step-up DC/DC Converter



Feature


MicroPower, 620kHz PWM, www.DataSheet4U. com Step-up DC/DC Converter POWER MANAG EMENT Description The SC1417B is a fixe d frequency, current mode step-up dc-dc converter. It operates over a wide inp ut supply range of 1.5V to 12V, making it suitable for battery input and TFT-L CD applications. The 620kHz constant fr equency oscillator minimizes the size o f external compone.
Manufacture

Semtech

Datasheet
Download SC1417B Datasheet




 SC1417B
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 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.
SC1417B
MicroPower, 620kHz PWM,
Step-up DCw/wDw.DCataCShoeent4Uv.ceomrter
Features
‹ 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
Applications
‹ TFT-LCD Bias supplies
‹ Constant current LED bias supplies
‹ Pagers
‹ GPS receivers
‹ Battery backup
‹ SEPIC converters
Typical Application Circuit
C1
47uF
2 Cells
(Alkaline)
R2 R3
1M 1M
R6
130k
L1 D1
10uH
U1
6
IN
7
LBI
3
EN
1
COMP
LX
FB
LBO
GND
5
2
8
4
SC1417B
SMB5819
3.3V@250mA
R1
1.0M
C2
VOUT
= 1.22 (1+
R1
R4
)
47uF
R4
604k
R5
33k
C3
3.3nF
LBO OUT
Revision: August 1, 2006
1
www.semtech.com




 SC1417B
SC1417B
POWER MANAGEMENT
Absolute Maximum Ratings
www.DataSheet4U.com
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.
Parameter
Symbol
Maximum
Units
Input Supply Voltage
LX Input
LBI Input
EN Input
FB Input
LBO Output
COMP Output
Operating Ambient Temperature Range
Operating Junction Temperature Range
Thermal Impedance, Junction to Ambient
Thermal Impedance, Junction to Case
Storage Temperature Range
Lead Temperature (Soldering) 10 Sec.
VIN
VLX
VLBI
VEN
VFB
VLBO
VCOMP
TA
TJ
θJA
θJC
TSTG
TLEAD
15
-0.4 to 20
-0.3 to 6
-0.3 to 6
-0.3 to 6
-0.3 to 15
-0.3 to 6
-40 to 85
-40 to 125
163
63
-65 to 150
300
V
V
V
V
V
V
V
°C
°C
°C/W
°C/W
°C
°C
Electrical Characteristics
Unless otherwise specified: TA = 25°C. Values in bold apply over full operating ambient temperature range. VIN = 2V, VEN = 2V, All voltages are with
respect to ground, -ve indicates current is flowing out of the pin.
Parameter
Symbol
Conditions
Min Typ Max Units
Input Voltage
VIN
VFB = 1.22V
1.5 12 V
2.0 12
Feedback Voltage
Supply Current in Shutdown
VFB
IQ(OFF)
VCOMP = 600mV, LX floating
VEN = 0V, VLBI = 300mV
1.16 1.22 1.28
40 55
65
V
µA
Supply Current in PWM Mode
Feedback Input Current
Error Amplifier Transconductance
IQ
IFB
Gm
IOUT = 0A, VCOMP = 100mV
VFB = 1.22V
dlCOMP = 5µA
4.3 5.8 mA
15 60
nA
70 140 240 µS
2006 Semtech Corp.
2
www.semtech.com




 SC1417B
SC1417B
POWER MANAGEMENT
www.DataSheet4U.com
Electrical Characteristics
Unless otherwise specified: TA = 25°C. Values in bold apply over full operating ambient temperature range. VIN = 2V, VEN = 2V, All voltages are with
respect to ground, -ve indicates current is flowing out of the pin.
Parameter
Symbol
Conditions
Min Typ Max Units
Error Amplifier Voltage Gain(1)
Maximum Output Current, L = 22uH (1)
AV(E.A.)
IOUT
Power Switch Voltage Drop (1)
(VLX-GND)
VOUT = 5.0V, VIN = 2.0V
VOUT = 10V, VIN = 5.0V
VOUT = 15V, VIN = 5.0V
ILX = 500mA
700
200
250
150
150 250
500
V/V
mA
mA
mA
mV
Power Switch Current Limit
Switch Leakage
Internal Oscillator Frequency
Maximum Duty Cycle
Low Battery Input Voltage Threshold
ILIM
ILX
fOSC
%DC
VLBI
0°C TA 85°C
-40°C TA 85°C
VLX = 5V
LX, EN open
0.70
0.60
520
80
190
180
0.95
0.01
620
85
200
1.20
3
720
210
210
A
µA
kHz
%
mV
LBI Input Current
Low Battery Output Low
Low Battery Detector Gain (1)
Enable Inputs
ILBI
VLBO(L)
AV
VLBI = 100mV
ILBO = 5µA
1Mload
-5
75
2000
-40
250
nA
mV
V/V
Enable Input Voltage
VIH
VIL
Enable Pin Current
IIH
IIL VSHDN = 0V
Notes:
(1) Guaranteed by design.
(2) This device is ESD sensitive. Use of standard ESD handling precautions is required.
1.4 0.6
0.60 0.25
300
-2.3 -6.0
V
V
nA
µA
2006 Semtech Corp.
3
www.semtech.com






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