FeaTures
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LTC1983-3/LTC1983-5
100mA Regulated
Charge-Pump Inverters
in ThinSOT
DescripTion
The
LTC
®
1983-3
and
LTC1983-5
are inverting charge
pump DC/DC converters that produce negative regulated
outputs. The parts require only three tiny external capaci-
tors and can provide up to 100mA of output current. The
devices can operate in open loop mode (creating a –V
IN
supply) or regulated output mode depending on the input
supply voltage and the output current.
The LTC1983-3/LTC1983-5 have many useful features for
portable applications including very low quiescent current
(25µA typical) and a zero current shutdown mode pro-
grammed through the
SHDN
pin.
The LTC1983-3/LTC1983-5 are over-temperature and
short-circuit protected. The parts are available in a 6-pin
low profile (1mm) ThinSOT package.
L,
LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks
and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
Fixed Output Voltages: –3V, –5V or Low Noise V
IN
to –V
IN
Inverted Output
±4% Output Voltage Accuracy
Low Quiescent Current: 25µA
100mA Output Current Capability
2.3V to 5.5V Operating Voltage Range
Internal 900kHz Oscillator
“Zero Current” Shutdown
Short-Circuit and Over-Temperature Protected
Low Profile (1mm) ThinSOT
TM
Package
applicaTions
n
n
n
n
–3V Generation in Single-Supply Systems
Portable Equipment
LCD Bias Supplies
GaAs FET Bias Supplies
Typical applicaTion
–3V at 100mA DC/DC Converter
V
IN
3V TO 5.5V
C
IN
10µF
OFF ON
V
IN
V
OUT
V
OUT
= –3V
I
OUT
= UP TO 100mA
C
OUT
10µF
–3.3
–3.2
–3.1
V
OUT
(V)
–3.0
–2.9
V
IN
= 3.3V
–2.8
–2.7
V
IN
= 5V
V
OUT
vs I
OUT
LTC1983-3
SHDN
C
+
GND
C
–
1983-3 TA01
C
FLY
1µF
C
FLY
: TAIYO YUDEN LMK212BJ105
C
IN
, C
OUT
: TAIYO YUDEN JMK316BJ106ML
0
20
40
60
I
OUT
(mA)
80
100
1983 TA02
1983fc
For more information
www.linear.com/LTC1983-3
1
LTC1983-3/LTC1983-5
absoluTe MaxiMuM raTings
(Note 1)
pin conFiguraTion
TOP VIEW
V
CC
1
V
OUT
2
C
+
3
6
SHDN
5 GND
4 C
–
V
IN
to GND ................................................... –0.3V to 6V
SHDN
Voltage .............................................. –0.3V to 6V
V
OUT
to GND (LTC1983-3)................... 0.2V to V
OUT
Max
V
OUT
to GND (LTC1983-5)................... 0.2V to V
OUT
Max
I
OUT
Max ..............................................................125mA
Output Short-Circuit Duration .......................... Indefinite
Operating Temperature Range (Note 2)....–40°C to 85°C
Storage Temperature Range .................. – 65°C to 125°C
Lead Temperature (Soldering, 10 sec)................... 300°C
S6 PACKAGE
6-LEAD PLASTIC SOT-23
T
JMAX
= 125°C,
θ
JA
= 256°C/W
orDer inForMaTion
LEAD FREE FINISH
LTC1983ES6-3#PBF
LTC1983ES6-5#PBF
TAPE AND REEL
LTC1983ES6-3#TRPBF
LTC1983ES6-5#TRPBF
http://www.linear.com/product/LTC1983-3#orderinfo
PART MARKING
LTPC
LTYB
PACKAGE DESCRIPTION
6-Lead Plastic TSOT-23
6-Lead Plastic TSOT-23
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/.
Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 5V, C
FLY
= 1µF, C
OUT
= 10µF unless otherwise noted.
PARAMETER
V
IN
Operating Voltage (Regulated Output Mode) (LTC1983-3)
(LTC1983-5)
V
IN
Minimum Startup Voltage
V
OUT
(LTC1983-3)
V
OUT
(LTC1983-5)
V
IN
Operating Current
V
IN
Operating Current (Open-Loop Mode) (LTC1983-5)
V
IN
Shutdown Current
Output Ripple
Open-Loop Output Impedance (LTC1983-3): R
OUT
V
IN
≥ 3.3V, I
OUT
≤ 25mA
V
IN
≥ 5V, I
OUT
≤ 100mA
V
IN
≥ 5V, V
IN
–5V ≥ I
OUT
•
R
OUT
V
IN
≤ 5.5V, I
OUT
= 0µA,
SHDN
= V
IN
V
IN
= 3.3V
V
IN
= 4.75V
SHDN
= 0V, V
IN
≤ 5.5V
3.3 ≤ V
IN
≤ 5.5
V
IN
= 3.3V, V
OUT
= –3V
l
l
l
l
l
elecTrical characTerisTics
CONDITIONS
l
MIN
3.0
5.0
2.3
–2.88
–2.88
–4.8
TYP
MAX
5.5
5.5
UNITS
V
V
V
V
V
V
µA
mA
mA
–3
–3
–5
25
2.5
4
0.1
60
11
–3.12
–3.12
–5.2
60
1
µA
mV
P-P
Ω
2
1983fc
For more information
www.linear.com/LTC1983-3
LTC1983-3/LTC1983-5
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 5V, C
FLY
= 1µF, C
OUT
= 10µF unless otherwise noted.
PARAMETER
Open-Loop Output Impedance (LTC1983-5): R
OUT
Oscillator Frequency
SHDN
Input High
SHDN
Input Low
SHDN
Input Current
V
SHDN
= 5.5V
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
CONDITIONS
V
IN
= 3.3V, I
OUT
≈
50mA
V
IN
= 5V, I
OUT
≈
60mA
(Non Burst Mode
®
Operation)
l
l
l
elecTrical characTerisTics
MIN
TYP
11
8.5
900
MAX
UNITS
Ω
Ω
kHz
V
1.1
0.3
2.2
4
V
µA
Note 2:
The LTC1983E-3/LTC1983E-5 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, characterization and
correlation with statistical process controls.
Typical perForMance characTerisTics
90
80
70
EFFICIENCY (%)
60
50
40
30
20
10
0
0
20
60
40
I
OUT
(mA)
T
A
= 25°C
80
100
1983 G01
Efficiency vs I
OUT
(LTC1983-5)
V
IN
= 5V
V
IN
= 2.3V
V
IN
= 3.3V
R
OUT
( )
Output Impedance vs
Input Voltage
12.5
12.0
11.5
11.0
10.5
10.0
9.5
9.0
8.5
8.0
2.35
5
3.35
V
IN
(V)
1983 TA02
I
OUT
= 25mA
T
A
= 25°C
30
25
20
15
10
Output Impedance
vs I
OUT
(LTC1983-5)
T
A
= 25°C
V
IN
= 2.3V
R
OUT
R
OUT
( )
V
IN
= 3.3V
V
IN
= 5V
4.35
5.35
0
20
60
40
I
OUT
(mA)
80
100
1983 G03
100
Efficiency vs I
OUT
V
OUT
= –3V
T
A
= 25°C
V
IN
= 3.3V
–2.1
–2.3
–3V
OUT
vs I
OUT
Over Temperature
3.3
3.2
3.1
V
OUT
(–V)
–3V
OUT
vs I
OUT
Over Temperature
(V
IN
= 5V)
V
IN
= 5V
75
EFFICIENCY (%)
V
OUT
(V)
V
IN
= 5V
50
120°C
–2.5
–2.7
–2.9
–3.1
–3.3
–40°C, 0°C, 40°C
80°C
3.0
2.9
–40°C 0°C
40°C
80°C
25
2.8
2.7
0
0.01
0.1
1
I
OUT
(mA)
10
100
1983 GO4
–3.5
0
20
80
60
100
40
OUTPUT CURRENT (mA)
120
1983 G05
0
20
100
40
60
80
OUTPUT CURRENT (mA)
120
1983 G06
1983fc
For more information
www.linear.com/LTC1983-3
3
LTC1983-3/LTC1983-5
Typical perForMance characTerisTics
Open-Loop Current
vs Temperature (LTC1983-5)
4.9
4.7
4.5
I
IN
(mA)
I
IN
(mA)
4.3
4.1
3.9
3.7
3.5
–40
60
10
TEMPERATURE (°C)
110
1983 G07
V
IN
= 5V
4.5
4.0
3.5
3.0
2.5
2.0
1.5
Open-Loop Input Current
vs V
IN
(LTC1983-5)
T
A
= 25°C
50
45
40
35
I
IN
(µA)
30
25
20
15
2.3
2.8
3.3
3.3
V
IN
(V)
4.3
4.8
1983 G09
Burst Mode Current
vs Temperature (LTC1983-3)
V
IN
= 5V
10
–40
10
60
110
1983 G08
TEMPERATURE (°C)
31.0
30.5
30.0
INPUT CURRENT (µA)
29.5
29.0
28.5
28.0
27.5
27.0
26.5
Burst Mode Input Current
vs V
IN
(LTC1983-3)
T
A
= 25°C
18
16
14
12
R
OUT
( )
10
8
6
4
2
R
OUT
vs Temperature
(I
OUT
= 10mA)
I
OUT
= 10mA
SHDN
Pin Threshold Voltage
vs Temperature
1.0
0.9
0.8
V
IN
= 3V
V
THRESHOLD
(V)
150
1983 G11
0.7
0.6
0.5
0.4
0.3
0.2
0.1
V
IN
= 5V
3.1
3.6
4.6
4.1
V
IN
(V)
5.1
5.5
1983 G10
0
–50
0
100
TEMPERATURE (°C)
50
0
–50
0
50
100
TEMPERATURE (°C)
150
1983 G12
SHDN
Pin Input Current
vs Temperature
3.5
3.0
2.5
I
SHDN
(µA)
2.0
1.5
1.0
0.5
0
–50
0
100
TEMPERATURE (°C)
50
150
1983 G13
140
120
100
R
OUT
( )
80
60
40
20
R
OUT
vs C
FLY
(V
IN
= 5V)
V
IN
= 5V
T
A
= 25°C
0
0.01
0.1
C
FLY
(µF)
1
1983 G14
4
1983fc
For more information
www.linear.com/LTC1983-3
LTC1983-3/LTC1983-5
Typical perForMance characTerisTics
V
OUT
Start-Up into 100mA
Resistive Load
V
OUT
Ripple at 100mA Load
V
OUT
1V
20mV
V
OUT
V
IN
5V
50µs/DIV
1983 G15
1µs/DIV
1983 G16
V
OUT
Ripple at 30mA Load
V
OUT
V
OUT
Load Step Response from
I
OUT
= 0 to I
OUT
= 100mA
20mV
20mV
V
OUT
100mA
I
OUT
2.5µs/DIV
1983 G17
100µs/DIV
1983 G18
1983fc
For more information
www.linear.com/LTC1983-3
5
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