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LT1617-1 Datasheet

Micropower Inverting DC/DC Converters in SOT-23

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FEATURES
s Low Quiescent Current:
20µA in Active Mode
<1µA in Shutdown Mode
s Operates with VIN as Low as 1V
s Low VCESAT Switch: 250mV at 300mA
s Uses Small Surface Mount Components
s High Output Voltage: Up to – 34V
s Tiny 5-Lead SOT-23 Package
U
APPLICATIO S
s LCD Bias
s Handheld Computers
s Battery Backup
s Digital Cameras
LT1617/LT1617-1
Micropower Inverting
DC/DC Converters
in SOT-23
DESCRIPTIO
The LT®1617/LT1617-1 are micropower inverting DC/DC
converters in a 5-lead SOT-23 package. The LT1617 is
designed for higher power systems with a 350mA current
limit and an input voltage range of 1.2V to 15V, whereas
the LT1617-1 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, result-
ing in high efficiency over a broad range of load current.
The 36V switch allows high voltage outputs up to – 34V to
be easily generated without the use of costly transformers.
The LT1617’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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
VIN
2.5V TO 4.2V
1-Cell Li-Ion to –15V Inverting Converter
L1
22µH
C3
0.22µF
L2
22µH
51
VIN SW
4
C1
4.7µF
LT1617
SHDN
NFB
GND
2
3
D1
267k
24.9k
C1: TAIYO YUDEN LMK316BJ475
C2: TAIYO YUDEN EMK316BJ475
C3: TAIYO YUDEN TMK316BJ224
L1, L2: MURATA LQH3C220K34
D1: MOTOROLA MBR0530
–15V
12mA
C2
4.7µF
1617/-1 TA01
80
75
70
65
60
55
50
0.1
Efficiency
VIN = 4.2V
VIN = 2.5V
1 10
LOAD CURRENT (mA)
30
1617/-1 TA01a
1


Linear Technology Electronic Components Datasheet

LT1617-1 Datasheet

Micropower Inverting DC/DC Converters in SOT-23

No Preview Available !

LT1617/LT1617-1
ABSOLUTE AXI U RATI GS
(Note 1)
VIN, SHDN Voltage ................................................... 15V
SW Voltage .............................................................. 36V
NFB Voltage ............................................................. – 3V
Current into NFB 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
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
ORDER PART
NUMBER
SW 1 5 VIN LT1617ES5
GND 2 LT1617ES5-1
NFB 3
4 SHDN
S5 PACKAGE
5-LEAD PLASTIC SOT-23
TJMAX = 125°C, θJA = 256°C/W
S5 PART MARKING
LTKF
LTKA
Consult factory for Industrial and Military grade parts.
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 1.2V, VSHDN = 1.2V unless otherwise noted.
PARAMETER
CONDITIONS
Minimum Input Voltage
LT1617-1
LT1617
Quiescent Current
FB Comparator Trip Point
Not Switching
VSHDN = 0V
FB Comparator Hysteresis
Output Voltage Line Regulation
FB Pin Bias Current (Note 3)
Switch Off Time
1.2V < VIN < 12V
VNFB = –1.23V
Switch VCESAT
Switch Current Limit
ISW = 60mA (LT1617-1)
ISW = 300mA (LT1617)
LT1617-1
LT1617
SHDN Pin Current
SHDN Input Voltage High
VSHDN = 1.2V
VSHDN = 5V
SHDN Input Voltage Low
Switch Leakage Current
Switch Off, VSW = 5V
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LT1617 and LT1617-1 are guaranteed to meet 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 current flows out of the NFB pin.
MIN
q –1.205
q 1.3
75
300
0.9
TYP
20
– 1.23
8
0.05
2
400
85
250
100
350
2
8
0.01
MAX
1.0
1.2
30
1
– 1.255
0.1
2.7
120
350
125
400
3
12
0.25
5
UNITS
V
V
µA
µA
V
mV
%/V
µA
ns
mV
mV
mA
mA
µA
µA
V
V
µA
2


Part Number LT1617-1
Description Micropower Inverting DC/DC Converters in SOT-23
Maker Linear Technology
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