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Linear Technology Electronic Components Datasheet

LT1618 Datasheet

Constant-Current/ Constant-Voltage 1.4MHz Step-Up DC/DC Converter

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LT1618
Constant-Current/
Constant-Voltage 1.4MHz
Step-Up DC/DC Converter
FEATURES
s Accurate Input/Output Current Control: ±5% Over
Temperature
s Accurate Output Voltage Control: ±1%
s Wide VIN Range: 1.6V to 18V
s 1.4MHz Switching Frequency
s High Output Voltage: Up to 35V
s Low VCESAT Switch: 200mV at 1A
s Tiny 10-Pin MSOP Package
U
APPLICATIO S
s LED Backlight Drivers
s USB Powered Boost/SEPIC Converters
s Input Current Limited Boost/SEPIC Converters
s Battery Chargers
DESCRIPTIO
The LT®1618 step-up DC/DC converter combines a tradi-
tional voltage feedback loop and a unique current feedback
loop to operate as a constant-current, constant-voltage
source. This fixed frequency, current mode switcher oper-
ates from a wide input voltage range of 1.6V to 18V, and
the high switching frequency of 1.4MHz permits the use of
tiny, low profile inductors and capacitors. The current
sense voltage is set at 50mV and can be adjusted using the
IADJ pin.
Available in the 10-Pin MSOP package, the LT1618 pro-
vides a complete solution for constant-current applica-
tions.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
USB to 12V Boost Converter
(with Selectable 100mA/500mA Input Current Limit)
VIN
5V
C1
4.7µF
3.3V
OFF ON
0V
0.1
L1
10µH
D1
27
ISN
3
ISP
SW
LT1618
81
VIN FB
9
SHDN
20k IADJ GND VC
4 5 10
VOUT
12V
R1
909k
C2
4.7µF
R2
107k
3.3V
100mA 500mA
0V
2k
13k
10nF
C1: TAIYO YUDEN JMK212BJ475
C2: TAIYO YUDEN EMK316BJ475
D1: ON SEMICONDUCTOR MBR0520
L1: SUMIDA CR43-100
1618 TA01a
Efficiency Curve
90
85
80
75
70
65
60
0 20 40 60 80 100 120 140 160
LOAD CURRENT (mA)
1618 TA01b
1


Linear Technology Electronic Components Datasheet

LT1618 Datasheet

Constant-Current/ Constant-Voltage 1.4MHz Step-Up DC/DC Converter

No Preview Available !

LT1618
ABSOLUTE AXI U RATI GS
(Note 1)
VIN, SHDN Voltage ................................................... 18V
SW Voltage .............................................................. 36V
ISP, ISN Voltage ...................................................... 36V
IADJ Voltage ............................................................... 6V
FB Voltage .............................................................. 1.5V
VC Voltage .............................................................. 1.5V
Junction Temperature ........................................... 125°C
Operating Temperature Range (Note 2) .. – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
FB 1
ISN 2
ISP 3
IADJ 4
GND 5
TOP VIEW
10 VC
9 SHDN
8 VIN
7 SW
6 N/C
MS10 PACKAGE
10-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 160°C/W
ORDER PART
NUMBER
LT1618EMS
MS10 PART
MARKING
LTNH
Consult LTC marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 1.6V, VSHDN = 1.6V, unless otherwise noted.
PARAMETER
Input Voltage
Quiescent Current
Reference Voltage
Reference Voltage Line Regulation
FB Pin Bias Current
Error Amplifier Voltage Gain
Error Amplifier Transconductance
Error Amplifier Sink Current
Error Amplifier Source Current
Current Sense Voltage (ISP, ISN)
ISP, ISN Pin Bias Currents (Note 3)
(ISP, ISN) Common Mode Minimum Voltage
Switching Frequency
Maximum Switch Duty Cycle
Switch Current Limit
Switch VCESAT
CONDITIONS
VSHDN = 1.6V, Not Switching
VSHDN = 0V
Measured at FB Pin
1.6V < VIN < 18V
VFB = 1.263V, VIN = 1.8V
IC = ± 5µA
VFB = 1.35V, VC = 1V
VFB = 1.10V, VC = 1V
VFB = 0V, VIADJ = 0V
VISP = 1.85V, VISN = 1.80V, VIADJ = 0V
VFB = 1V
VFB = 0V
ISW = 1A
MIN
1.6
1.250
q 1.243
q
q 47.5
1.25
q 88
1.5
TYP
1.8
0.1
1.263
1.263
0.01
±2
180
160
15
30
50
50
1.4
550
92
2.1
200
MAX
18
2.7
1
1.276
1.283
0.03
±12
52.5
80
1.8
1.6
2.8
260
UNITS
V
mA
µA
V
V
%/V
nA
V/V
µmho
µA
µA
mV
µA
V
MHz
kHz
%
A
mV
2


Part Number LT1618
Description Constant-Current/ Constant-Voltage 1.4MHz Step-Up DC/DC Converter
Maker Linear Technology
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LT1618 Datasheet PDF






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