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LT1615ES5-1#TRMPBF

P1-P3P4-P6P7-P8
1
LT1615/LT1615-1
sn16151 16151fas
Micropower Step-Up
DC/DC Converters
in ThinSOT
The LT
®
1615/LT1615-1 are micropower step-up DC/DC
converters in a 5-lead low profile (1mm) ThinSOT pack-
age. The LT1615 is designed for higher power systems
with a 350mA current limit and an input voltage range of
1.2V to 15V, whereas the LT1615-1 is intended for lower
power and single-cell applications with a 100mA current
limit and an extended input voltage range of 1V to 15V.
Otherwise, the two devices are functionally equivalent.
Both devices feature a quiescent current of only 20µA at no
load, which further reduces to 0.5µA in shutdown. A
current limited, fixed off-time control scheme conserves
operating current, resulting in high efficiency over a broad
range of load current. The 36V switch allows high voltage
outputs up to 34V to be easily generated in a simple boost
topology without the use of costly transformers. The
LT1615’s low off-time of 400ns permits the use of tiny, low
profile inductors and capacitors to minimize footprint and
cost in space-conscious portable applications.
■
Low Quiescent Current:
20
µ
A in Active Mode
<1
µ
A in Shutdown Mode
■
Operates with V
IN
as Low as 1V
■
Low V
CESAT
Switch: 250mV at 300mA
■
Uses Small Surface Mount Components
■
High Output Voltage: Up to 34V
■
Low Profile (1mm) ThinSOT
TM
Package
■
LCD Bias
■
Handheld Computers
■
Battery Backup
■
Digital Cameras
, LTC and LT are registered trademarks of Linear Technology Corporation.
1-Cell Li-Ion to 20V Converter for LCD Bias
V
IN
SW
FB
LT1615
V
IN
2.5V TO 4.2V
L1
10µH
D1
SHDN
R2
130k
R1
2M
C2
1µF
20V
12mA
C1: TAIYO YUDEN LMK316BJ475
C2: TAIYO YUDEN TMK316BJ105
D1: MOTOROLA MBR0530
L1: MURATA LQH3C100K24
1615/-1 TA01
GND
C1
4.7µF
Efficiency
LOAD CURRENT (mA)
0.1 0.3
EFFICIENCY (%)
1 3 10 30
1615/-1 TA01a
85
80
75
70
65
60
55
50
V
IN
= 4.2V
V
IN
= 2.5V
V
IN
= 3.3V
APPLICATIO S
U
FEATURES
TYPICAL APPLICATIO
U
DESCRIPTIO
U
ThinSOT is a trademark of Linear Technology Corporation.
2
LT1615/LT1615-1
sn16151 16151fas
ABSOLUTE AXI U RATI GS
W
WW
U
PACKAGE/ORDER I FOR ATIO
UUW
(Note 1)
V
IN
, SHDN Voltage ................................................... 15V
SW Voltage .............................................................. 36V
FB Voltage .................................................................V
IN
Current into FB Pin ................................................. 1mA
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
ORDER PART
NUMBER
LT1615ES5
LT1615ES5-1
LT1615IS5
LT1615IS5-1
S5 PART MARKING
SW 1
GND 2
TOP VIEW
S5 PACKAGE
5-LEAD PLASTIC SOT-23
FB 3
5 V
IN
4 SHDN
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage LT1615-1 1.0 V
LT1615 1.2 V
Quiescent Current Not Switching 20 30 µA
V
SHDN
= 0V 1 µA
FB Comparator Trip Point ● 1.205 1.23 1.255 V
FB Comparator Hysteresis 8mV
Output Voltage Line Regulation 1.2V < V
IN
< 12V 0.05 0.1 %/V
FB Pin Bias Current (Note 3) V
FB
= 1.23V ● 30 80 nA
Switch Off Time V
FB
> 1V 400 ns
V
FB
< 0.6V 1.5 µs
Switch V
CESAT
I
SW
= 70mA (LT1615-1) 85 120 mV
I
SW
= 300mA (LT1615) 250 350 mV
Switch Current Limit LT1615-1 75 100 125 mA
LT1615 300 350 400 mA
SHDN Pin Current V
SHDN
= 1.2V 2 3 µA
V
SHDN
= 5V 8 12 µA
SHDN Input Voltage High 0.9 V
SHDN Input Voltage Low 0.25 V
Switch Leakage Current Switch Off, V
SW
= 5V 0.01 5 µA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LT1615E and LT1615E-1 are 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,
T
JMAX
= 125°C, θ
JA
= 256°C/W
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 1.2V, V
SHDN
= 1.2V unless otherwise noted.
LTIZ
LTKH
LTXZ
LTBHT
characterization and correlation with statistical process controls. The
LT1615I/LT1615I-1 is guaranteed to meet performance specifications over
the –40°C to 85°C operating temperature range.
Note 3: Bias current flows into the FB pin.
Consult LTC Marketing for parts specified with wider operating temperature ranges.
3
LT1615/LT1615-1
sn16151 16151fas
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Switch Saturation Voltage
(V
CESAT
) Quiescent Current
Feedback Pin Voltage and
Bias Current
TEMPERATURE (°C)
–50
–25 0 25 50 75 100
SWITCH VOLTAGE (V)
1615/-1 G01
0.60
0.55
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
I
SWITCH
= 500mA
I
SWITCH
= 300mA
TEMPERATURE (°C)
–50
FEEDBACK VOLTAGE (V)
1615/-1 G02
1.25
1.24
1.23
1.22
1.21
1.20
BIAS CURRENT (nA)
50
40
30
20
10
0
CURRENT
VOLTAGE
–25 0 25 50 75 100
TEMPERATURE (°C)
QUIESCENT CURRENT (µA)
1615/-1 G03
25
23
21
19
17
15
–50 –25 0 25 50 75 100
V
IN
= 12V
V
IN
= 1.2V
V
FB
= 1.23V
NOT SWITCHING
PI FU CTIO S
UUU
SW (Pin 1): Switch Pin. This is the collector of the internal
NPN power switch. Minimize the metal trace area con-
nected to this pin to minimize EMI.
GND (Pin 2): Ground. Tie this pin directly to the local
ground plane.
FB (Pin 3): Feedback Pin. Set the output voltage by
selecting values for R1 and R2 (see Figure 1):
RR
V
OUT
12
123
1=−
.
SHDN (Pin 4): Shutdown Pin. Tie this pin to 0.9V or higher
to enable the device. Tie below 0.25V to turn off the device.
V
IN
(Pin 5): Input Supply Pin. Bypass this pin with a
capacitor as close to the device as possible.
TEMPERATURE (°C)
SWITCH OFF TIME (ns)
1615/-1 G04
550
500
450
400
350
300
250
–50 –25 0 25 50 75 100
V
IN
= 1.2V
V
IN
= 12V
TEMPERATURE (°C)
PEAK CURRENT (mA)
1615/-1 G05
400
350
300
250
200
150
100
50
0
–50 –25 0 25 50 75 100
V
IN
= 12V
V
IN
= 1.2V
V
IN
= 12V
LT1615-1
LT1615
V
IN
= 1.2V
SHUTDOWN PIN VOLTAGE (V)
SHUTDOWN PIN CURRENT (µA)
1615/-1 G03
25
20
15
10
5
0
0 5 10 15
25°C
100°C
Switch Off Time Shutdown Pin CurrentSwitch Current Limit
P1-P3P4-P6P7-P8

LT1615ES5-1#TRMPBF

Mfr. #:
Buy LT1615ES5-1#TRMPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Micropower Step-Up DC/DC Converters in ThinSOT
Lifecycle:
New from this manufacturer.
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