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LT1614IS8#TRPBF

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1
LT1614
Inverting 600kHz
Switching Regulator
The LT
®
1614 is a fixed frequency, inverting mode switch-
ing reglator that operates from an input voltage as low as
1V. Utilizing a low noise topology, the LT1614 can gener-
ate a negative output down to –24V from a 1V to 5V input.
Fixed frequency switching ensures a clean output free
from low frequency noise. The device contains a low-
battery detector with a 200mV reference and shuts down
to less than 10µA. No load quiescent current of the LT1614
is 1mA and the internal NPN power switch handles a
500mA current with a voltage drop of just 295mV.
High frequency switching enables the use of small induc-
tors and capacitors. Ceramic capacitors can be used in
many applications, eliminating the need for bulky tanta-
lum types.
The LT1614 is available in 8-lead MSOP or SO packages.
■
Better Regulation Than a Charge Pump
■
0.1
Ω
Effective Output Impedance
■
–5V at 200mA from a 5V Input
■
600kHz Fixed Frequency Operation
■
Operates with V
IN
as Low as 1V
■
1mA Quiescent Current
■
Low Shutdown Current: 10µA
■
Low-Battery Detector
■
Low V
CESAT
Switch: 295mV at 500mA
, LTC and LT are registered trademarks of Linear Technology Corporation.
■
MR Head Bias
■
LCD Bias
■
GaAs FET Bias
■
Positive-to-Negative Conversion
5V to –5V Converter Efficiency
Figure 1. 5V to –5V/200mA Converter
V
IN
SW
LT1614
L1
22µH
V
IN
5V
D1
NFB
SHDN
69.8k
24.9k
100k
1nF
V
OUT
–5V
200mA
C1, C2: AVX TAJB336M010
C3: TAIYO YUDEN EMK316BJ105MF
D1: MBR0520
L1, L2: MURATA LQH3C220
1614 TA01
C1
33µF
C2
33µF
V
C
GND
L2
22µH
C3
1µF
+
+
LOAD CURRENT (mA)
31030
EFFICIENCY (%)
60
70
80
90
100 300
1614 TA02
50
40
APPLICATIO S
U
FEATURES
TYPICAL APPLICATIO
U
DESCRIPTIO
U
2
LT1614
A
U
G
W
A
W
U
W
ARB
S
O
LU
T
EXI T
I
S
V
IN
, SHDN, LBO Voltage ......................................... 12V
SW Voltage ............................................... –0.4V to 30V
NFB Voltage ............................................................ –3V
V
C
Voltage ................................................................ 2V
LBI Voltage ............................................ 0V ≤ V
LBI
≤ 1V
Current into FB Pin .............................................. ±1mA
Junction Temperature...........................................125°C
Operating Temperature Range
LT1614C................................................. 0°C to 70°C
LT1614I ............................................. –40°C to 85°C
Extended Commercial
Temperature Range (Note 2) .................. –40°C to 85°C
Storage Temperature Range ................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
E
LECTR
IC
AL C CHARA TERIST
ICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
Quiescent Current 12mA
V
SHDN
= 0V 5 10 µA
Feedback Voltage ● –1.21 –1.24 –1.27 V
NFB Pin Bias Current (Note 3) V
NFB
= –1.24V ● –2.5 –4.5 –7 µA
Reference Line Regulation 1V ≤ V
IN
≤ 2V 0.6 1.1 %/V
2V ≤ V
IN
≤ 6V 0.3 0.8 %/V
Minimum Input Voltage 0.92 1 V
Maximum Input Voltage ● 6V
Error Amp Transconductance ∆I = 5µA16µmhos
Error Amp Voltage Gain 100 V/V
Switching Frequency ● 500 600 750 kHz
Maximum Duty Cycle 73 80 %
● 70 80 %
Switch Current Limit (Note 4) 0.75 1.2 A
WU
U
PACKAGE
/
O
RDER I FOR ATIO
T
JMAX
= 125°C, θ
JA
= 160°C/W
Consult factory for Military grade parts.
ORDER PART
NUMBER
LT1614CS8
LT1614IS8
S8 PART MARKING
1614
1614I
ORDER PART
NUMBER
LT1614CMS8
LT1614IMS8
MS8 PART MARKING
LTID
LTJB
1
2
3
4
NFB
V
C
SHDN
GND
8
7
6
5
LBO
LBI
V
IN
SW
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 125°C, θ
JA
= 120°C/W
1
2
3
4
8
7
6
5
TOP VIEW
LBO
LBI
V
IN
SW
NFB
V
C
SHDN
GND
S8 PACKAGE
8-LEAD PLASTIC SO
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. Commercial Grade 0°C to 70°C. V
IN
= 1.5V, V
SHDN
= V
IN
unless
otherwise noted.
(Note 1)
3
LT1614
PARAMETER CONDITIONS MIN TYP MAX UNITS
Switch V
CESAT
I
SW
= 500mA (25°C, 0°C) 295 350 mV
I
SW
= 500mA (70°C) 400 mV
Shutdown Pin Current V
SHDN
= V
IN
10 20 µA
V
SHDN
= 0V –5 –10 µA
LBI Threshold Voltage 190 200 210 mV
● 185 215 mV
LBO Output Low I
SINK
= 10µA 0.1 0.25 V
LBO Leakage Current V
LBI
= 250mV, V
LBO
= 5V 0.01 0.1 µA
LBI Input Bias Current (Note 5) V
LBI
= 150mV 10 50 nA
Low-Battery Detector Gain 1MΩ Load 1000 V/V
Switch Leakage Current V
SW
= 5V 0.01 3 µA
E
LECTR
IC
AL C CHARA TERIST
ICS
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LT1614C is guaranteed to meet specified performance from
0°C to 70°C and is designed, characterized and expected to meet these
extended temperature limits, but is not tested at –40°C and 85°C. The
LT1614I is guaranteed to meet the extended temperature limits.
Industrial Grade –40°C to 85°C. V
IN
= 1.5V, V
SHDN
= V
IN
unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Quiescent Current 12mA
V
SHDN
= 0V 5 10 µA
Feedback Voltage ● –1.21 –1.24 –1.27 V
NFB Pin Bias Current (Note 3) V
NFB
= –1.24V ● –2 –4.5 –7.5 µA
Reference Line Regulation 1V ≤ V
IN
≤ 2V 0.6 1.1 %/V
2V ≤ V
IN
≤ 6V 0.3 0.8 %/V
Minimum Input Voltage –40°C 1.1 1.25 V
85°C 0.8 1.0 V
Maximum Input Voltage ● 6V
Error Amp Transconductance ∆I = 5µA16µmhos
Error Amp Voltage Gain 100 V/V
Switching Frequency ● 500 600 750 kHz
Maximum Duty Cycle ● 70 80 %
Switch Current Limit (Note 4) 0.75 1.2 A
Switch V
CESAT
I
SW
= 500mA (–40°C) 250 350 mV
I
SW
= 500mA (85°C) 330 400 mV
Shutdown Pin Current V
SHDN
= V
IN
10 20 µA
V
SHDN
= 0V –5 –10 µA
LBI Threshold Voltage ● 180 200 220 mV
LBO Output Low I
SINK
= 10µA 0.1 0.25 V
LBO Leakage Current V
LBI
= 250mV, V
LBO
= 5V 0.1 0.3 µA
LBI Input Bias Current (Note 5) V
LBI
= 150mV 5 30 nA
Low-Battery Detector Gain 1MΩ Load 1000 V/V
Switch Leakage Current V
SW
= 5V 0.01 3 µA
Note 3: Bias current flows out of NFB pin.
Note 4: Switch current limit guaranteed by design and/or correlation to
static tests. Duty cycle affects current limit due to ramp generator.
Note 5: Bias current flows out of LBI pin.
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. Commercial Grade 0°C to 70°C. V
IN
= 1.5V, V
SHDN
= V
IN
unless
otherwise noted.
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LT1614IS8#TRPBF

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Buy LT1614IS8#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Inv 600kHz Sw Reg
Lifecycle:
New from this manufacturer.
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