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LT1618EMS#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
LT1618
1
sn1618 1618fas
APPLICATIO S
U
FEATURES
DESCRIPTIO
U
TYPICAL APPLICATIO
U
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
I
ADJ
pin.
Available in the 10-Pin (3mm × 3mm) Exposed Pad DFN
and 10-pin MSOP packages, the LT1618 provides a com-
plete solution for constant-current applications.
■
LED Backlight Drivers
■
USB Powered Boost/SEPIC Converters
■
Input Current Limited Boost/SEPIC Converters
■
Battery Chargers
, LTC and LT are registered trademarks of Linear Technology Corporation.
■
Accurate Input/Output Current Control: ±5% Over
Temperature
■
Accurate Output Voltage Control: ±1%
■
Wide V
IN
Range: 1.6V to 18V
■
1.4MHz Switching Frequency
■
High Output Voltage: Up to 35V
■
Low V
CESAT
Switch: 200mV at 1A
■
Available in (3mm × 3mm × 0.8mm) 10-Pin DFN and
10-Pin MSOP Packages
Constant-Current/
Constant-Voltage 1.4MHz
Step-Up DC/DC Converter
Efficiency Curve
USB to 12V Boost Converter
(with Selectable 100mA/500mA Input Current Limit)
LOAD CURRENT (mA)
EFFICIENCY (%)
1618 TA01b
90
85
80
75
70
65
60
0
40
80
100
20 60
120
140
160
OFF
ON
SHDN
I
ADJ
V
C
V
IN
V
OUT
12V
SW
ISN
ISP
FB
LT1618
R1
909k
R2
107k
V
IN
5V
C1
4.7µF
10nF
C2
4.7µF
1618 TA01a
D1
L1
10µH
3
2
1
9
8
7
GND
5104
C1: TAIYO YUDEN JMK212BJ475
C2: TAIYO YUDEN EMK316BJ475
D1: ON SEMICONDUCTOR MBR0520
L1: SUMIDA CR43-100
0.1Ω
2k
13k
20k
0V
3.3V
100mA
500mA
0V
3.3V
LT1618
2
sn1618 1618fas
V
IN
, SHDN Voltage ................................................... 18V
SW Voltage .............................................................. 36V
ISP, ISN Voltage ...................................................... 36V
I
ADJ
Voltage ............................................................... 6V
FB Voltage .............................................................. 1.5V
V
C
Voltage .............................................................. 1.5V
DD PART
MARKING
T
JMAX
= 125°C, θ
JA
= 160°C/W
Consult LTC marketing for parts specified with wider operating temperature ranges.
LT1618EDD
ABSOLUTE AXI U RATI GS
W
WW
U
PACKAGE/ORDER I FOR ATIO
UUW
(Note 1)
ORDER PART
NUMBER
LAFQ
1
2
3
4
5
FB
ISN
ISP
I
ADJ
GND
10
9
8
7
6
V
C
SHDN
V
IN
SW
NC
TOP VIEW
MS PACKAGE
10-LEAD PLASTIC MSOP
Junction Temperature........................................... 125°C
Operating Temperature Range (Note 2) .. – 40°C to 85°C
Storage Temperature Range
MSOP ............................................... – 65°C to 150°C
DFN ................................................. – 65°C to 125°C
Lead Temperature (Soldering, 10 sec) (MSOP) .... 300°C
MS PART
MARKING
LT1618EMS
ORDER PART
NUMBER
LTNH
TOP VIEW
11
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
10
9
6
7
8
4
5
3
2
1
V
C
SHDN
V
IN
SW
SW
FB
ISN
ISP
I
ADJ
GND
T
JMAX
= 125°C, θ
JA
= 43°C/W, θ
JC
= 3°C/W
EXPOSED PAD (PIN 11) IS GND AND
MUST BE SOLDERED TO PCB
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 1.6V, V
SHDN
= 1.6V, unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Voltage 1.6 18 V
Quiescent Current V
SHDN
= 1.6V, Not Switching 1.8 2.7 mA
V
SHDN
= 0V 0.1 1 µA
Reference Voltage Measured at FB Pin 1.250 1.263 1.276 V
● 1.243 1.263 1.283 V
Reference Voltage Line Regulation 1.6V < V
IN
< 18V 0.01 0.03 %/V
FB Pin Bias Current V
FB
= 1.263V, V
IN
= 1.8V ● ±2 ±12 nA
Error Amplifier Voltage Gain 180 V/V
Error Amplifier Transconductance ∆I
C
= ± 5µA 160 µmho
Error Amplifier Sink Current V
FB
= 1.35V, V
C
= 1V 15 µA
Error Amplifier Source Current V
FB
= 1.10V, V
C
= 1V 30 µA
Current Sense Voltage (ISP, ISN) V
FB
= 0V, V
IADJ
= 0V ● 47.5 50 52.5 mV
ISP, ISN Pin Bias Currents (Note 3) V
ISP
= 1.85V, V
ISN
= 1.80V, V
IADJ
= 0V 50 80 µA
(ISP, ISN) Common Mode Minimum Voltage 1.8 V
Switching Frequency V
FB
= 1V 1.25 1.4 1.6 MHz
V
FB
= 0V 550 kHz
Maximum Switch Duty Cycle ● 88 92 %
Switch Current Limit (Note 4) 1.5 2.1 2.8 A
LT1618
3
sn1618 1618fas
TYPICAL PERFOR A CE CHARACTERISTICS
UW
TEMPERATURE (°C)
–50
FEEDBACK VOLTAGE (V)
125
1618 G02
0
75
1.270
1.265
1.260
1.255
1.250
4
2
0
–2
–4
–25 25 50
100
VOLTAGE
CURRENT
FB PIN BIAS CURRENT (nA)
TEMPERATURE (°C)
–50
PEAK CURRENT (A)
125
1618 G03
0
75
2.5
2.0
1.5
1.0
0.5
0
–25 25 50
100
TEMPERATURE (°C)
–50
CURRENT SENSE VOLTAGE (mV)
125
1618 G04
0
75
52
51
50
49
48
–25 25 50
100
I
ADJ
PIN VOLTAGE (V)
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
CURRENT SENSE VOLTAGE (mV)
1618 G05
60
50
40
30
20
10
0
TEMPERATURE (°C)
–50
QUIESCENT CURRENT (mA)
125
1618 G06
0
75
2.5
2.0
1.5
1.0
0.5
0
–25 25 50
100
V
IN
= 18V
V
IN
= 1.6V
FB Pin Voltage and Bias Current
Switch Current Limit
Current Sense Voltage
(I
ADJ
Pin = 0V)
Current Sense Voltage
(V
ISP, ISN
)
Quiescent Current
Switch Saturation Voltage
(V
CE, SAT
)
SWITCH CURRENT (A)
0
SATURATION VOLTAGE (mV)
2.0
1618 G01
0.5
1.0
1.5
500
400
300
200
100
0
T
J
= 125°C
T
J
= –50°C
T
J
= 25°C
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LT1618 is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization, and correlation
with statistical process controls.
Note 3: Bias currents flow into the ISP and ISN pins.
Note 4: Switch current limit and switch V
CESAT
for the DD package is
guaranteed by design and/or correlation to static test.
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 1.6V, V
SHDN
= 1.6V, unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Switch V
CESAT
I
SW
= 1A (Note 4) 200 260 mV
Switch Leakage Current Switch Off, V
SW
= 5V 0.01 5 µA
SHDN Pin Current V
SHDN
= 1.6V 5 20 µA
Shutdown Threshold (SHDN Pin) 0.3 V
Start-Up Threshold (SHDN Pin) 1V
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LT1618EMS#PBF

Mfr. #:
Buy LT1618EMS#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Const-C/Const-V 1.4MHz Boost DC/DC Conv
Lifecycle:
New from this manufacturer.
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