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LT1617ES5-1#TRMPBF

P1-P3P4-P6P7-P8
1
LT1617/LT1617-1
TYPICAL APPLICATION
U
APPLICATIO S
U
DESCRIPTIO
U
FEATURES
Micropower Inverting
DC/DC Converters
in SOT-23
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.
■
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
■
Tiny 5-Lead SOT-23 Package
■
LCD Bias
■
Handheld Computers
■
Battery Backup
■
Digital Cameras
, LTC and LT are registered trademarks of Linear Technology Corporation.
1-Cell Li-Ion to –15V Inverting Converter
Efficiency
V
IN
SW
NFB
LT1617
V
IN
2.5V TO 4.2V
L1
22µH
D1
SHDN
24.9k
267k
C2
4.7µF
–15V
12mA
1617/-1 TA01
GND
C1
4.7µF
C1: TAIYO YUDEN LMK316BJ475
C2: TAIYO YUDEN EMK316BJ475
C3: TAIYO YUDEN TMK316BJ224
L1, L2: MURATA LQH3C220K34
D1: MOTOROLA MBR0530
L2
22µH
43
2
15
C3
0.22µF
LOAD CURRENT (mA)
0.1 1 10 30
EFFICIENCY (%)
80
75
70
65
60
55
50
1617/-1 TA01a
V
IN
= 4.2V
V
IN
= 2.5V
2
LT1617/LT1617-1
ABSOLUTE AXI U RATI GS
W
WW
U
PACKAGE/ORDER I FOR ATIO
UUW
(Note 1)
V
IN
, 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
ORDER PART
NUMBER
LT1617ES5
LT1617ES5-1
Consult factory for Industrial and Military grade parts.
S5 PART MARKING
SW 1
GND 2
TOP VIEW
S5 PACKAGE
5-LEAD PLASTIC SOT-23
NFB 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 LT1617-1 1.0 V
LT1617 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
NFB
= –1.23V ● 1.3 2 2.7 µA
Switch Off Time 400 ns
Switch V
CESAT
I
SW
= 60mA (LT1617-1) 85 120 mV
I
SW
= 300mA (LT1617) 250 350 mV
Switch Current Limit LT1617-1 75 100 125 mA
LT1617 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 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.
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.
LTKF
LTKA
3
LT1617/LT1617-1
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)
1617/-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)
1617/-1 G02
–1.25
–1.24
–1.23
–1.22
–1.21
–1.20
BIAS CURRENT (µA)
5
4
3
2
1
0
CURRENT
VOLTAGE
–25 0 25 50 75 100
TEMPERATURE (°C)
QUIESCENT CURRENT (µA)
1617/-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.
NFB (Pin 3): Feedback Pin. Set the output voltage by
selecting values for R1 and R2 (see Figure 1):
R
V
R
OUT
1
123
123
2
210
6
=
−
+
()
−
.
.
•
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)
1617/-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)
SWITCH CURRENT LIMIT (mA)
1617/-1 G05
400
350
300
250
200
150
100
50
0
–50 –25 0 25 50 75 100
V
IN
= 1.2V
V
IN
= 12V
V
IN
= 1.2V
LT1617-1
LT1617
V
IN
= 12V
SHUTDOWN PIN VOLTAGE (V)
SHUTDOWN PIN CURRENT (µA)
1617/-1 G06
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

LT1617ES5-1#TRMPBF

Mfr. #:
Buy LT1617ES5-1#TRMPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators uP Inv DC/DC Convs in SOT-23
Lifecycle:
New from this manufacturer.
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