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LTC1046CN8#PBF

P1-P3P4-P6P7-P9P10-P12
1
LTC1046
1046fb
“Inductorless”
5V to –5V Converter
Generating –5V from 5V
Output Voltage vs Load Current for V
+
= 5V
The LTC
®
1046 is a 50mA monolithic CMOS switched
capacitor voltage converter. It plugs in for the ICL7660/
LTC1044 in 5V applications where more output current is
needed. The device is optimized to provide high current
capability for input voltages of 6V or less. It trades off
operating voltage to get higher output current. The
LTC1046 provides several voltage conversion functions:
the input voltage can be inverted (V
OUT
= –V
IN
), divided
(V
OUT
= V
IN/
2) or multiplied (V
OUT
= ±nV
IN
).
Designed to be pin-for-pin and functionally compatible
with the ICL7660 and LTC1044, the LTC1046 provides 2.5
times the output drive capability.
■
50mA Output Current
■
Plug-In Compatible with ICL7660/LTC1044
■
R
OUT
= 35Ω Maximum
■
300µA Maximum
No Load Supply Current at 5V
■
Boost Pin (Pin 1) for Higher Switching Frequency
■
97% Minimum Open-Circuit Voltage Conversion
Efficiency
■
95% Minimum Power Conversion Efficiency
■
Wide Operating Supply Voltage Range: 1.5V to 6V
■
Easy to Use
■
Low Cost
■
Conversion of 5V to ±5V Supplies
■
Precise Voltage Division, V
OUT
= V
IN
/2
■
Supply Splitter, V
OUT
= ±V
S
/2
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
, LTC and LT are registered trademarks of Linear Technology Corporation.
1
2
3
4
8
7
6
5
V
+
OSC
LV
V
OUT
BOOST
CAP
+
GND
CAP
–
LTC1046
10µF
10µF
1046 TA01
5V INPUT
–5V OUTPUT
+
+
LOAD CURRENT, I
L
(mA)
0
0
OUTPUT VOLTAGE (V)
–1
–2
–3
–4
–5
10 20 30 40
1046 TA02
50
ICL7660/LTC1044,
R
OUT
= 55Ω
T
A
= 25°C
LTC1046,
R
OUT
= 27Ω
LTC1046
2
1046fb
A
U
G
W
A
W
U
W
ARB
S
O
LU
T
EXI T
I
S
ORDER PART
NUMBER
Supply Voltage ....................................................... 6.5V
Input Voltage on Pins 1, 6 and 7
(Note 2) ............................ –0.3 < V
IN
< (V
+
) +0.3V
Current into Pin 6 .................................................. 20µA
Output Short Circuit Duration
(V
+
≤ 6V) ...............................................Continuous
WU
U
PACKAGE
/
O
RDER I FOR ATIO
LTC1046MJ8
T
JMAX
= 160°C, θ
JA
= 100°C
Operating Temperature Range
LTC1046C .................................... 0°C ≤ T
A
≤ 70°C
LTC1046I .................................–40°C ≤ T
A
≤ 85°C
LTC1046M (OBSOLETE)............ –55°C to 125°C
Storage Temperature Range ............... –65°C to +150°C
Lead Temperature (Soldering, 10 sec.).................300°C
(Note 1)
ORDER PART
NUMBER
LTC1046CN8
LTC1046CS8
LTC1046IN8
LTC1046IS8
S8 PART MARKING
1046
1046I
T
JMAX
= 110°C, θ
JA
= 130°C (N8)
T
JMAX
= 150°C, θ
JA
= 150°C (S8)
1
2
3
4
8
7
6
5
TOP VIEW
V
+
OSC
LV
V
OUT
BOOST
CAP
+
GND
CAP
–
J8 PACKAGE
8-LEAD CERDIP
OBSOLETE PACKAGE
Consider the N8 or S8 for Alternate Source
1
2
3
4
8
7
6
5
TOP VIEW
V
+
OSC
LV
V
OUT
BOOST
CAP
+
GND
CAP
–
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
Consult LTC Marketing for parts specified with wider operating temperature ranges.
E
LECTR
IC
AL C CHARA TERIST
ICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
+
= 5V, C
OSC
= 0pF, unless otherwise noted.
LTC1046C LTC1046I/M
SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
I
S
Supply Current R
L
= ∞, Pins 1 and 7 No Connection 165 300 165 300 µA
R
L
= ∞, Pins 1 and 7 No Connection, 35 35 µA
V
+
= 3V
V
+
L
Minimum Supply Voltage R
L
= 5kΩ ● 1.5 1.5 V
V
+
H
Maximum Supply Voltage R
L
= 5kΩ ● 66V
R
OUT
Output Resistance V
+
= 5V, I
L
= 50mA (Note 3) 27 35 27 35 Ω
● 27 45 27 50 Ω
V
+
= 2V, I
L
= 10mA ● 60 85 60 90 Ω
f
OSC
Oscillator Frequency V
+
= 5V (Note 4) 20 30 20 30 kHz
V
+
= 2V 4 5.5 4 5.5 kHz
P
EFF
Power Efficiency R
L
= 2.4kΩ 95 97 95 97 %
V
OUTEFF
Voltage Conversion R
L
= ∞ 97 99.9 97 99.9 %
Efficiency
I
OSC
Oscillator Sink or Source V
OSC
= 0V or V
+
Current Pin 1 = 0V ● 4.2 35 4.2 40 µA
Pin 1 = V
+
● 15 45 15 50 µA
3
LTC1046
1046fb
OSCILLATOR FREQUENCY, f
OSC
(Hz)
100
80
POWER CONVERSION EFFICIENCY, P
EFF
(%)
86
92
98
100
1k 10k 100k 1M
1046 G06
96
94
90
88
84
82
V
+
= 5V
T
A
= 25°C
C1 = C2
A = 100µF, 1mA
B = 100µF, 15mA
C = 10µF, 1mA
D = 10µF, 15mA
E = 1µF, 1mA
F = 1µF, 15mA
A
C
B
E
D
F
LOAD CURRENT, I
L
(mA)
0
30
POWER CONVERSION EFFICIENCY, P
EFF
(%)
50
60
70
80
90
100
30 40 60 70
1046 G05
40
10 20 50
P
EFF
I
S
20
10
0
T
A
= 25°C
V
+
= 5V
C1 = C2 = 10µF
f
OSC
= 30kHz
30
50
60
70
80
90
100
40
20
10
0
SUPPLY CURRENT (mA)
LOAD CURRENT, I
L
(mA)
0
30
POWER CONVERSION EFFICIENCY, P
EFF
(%)
50
60
70
80
90
100
34 67
1046 G04
40
12 5
P
EFF
I
S
20
10
0
T
A
= 25°C
V
+
= 2V
C1 = C2 = 10µF
f
OSC
= 8kHz
8910
3
5
6
7
8
9
10
4
2
1
0
SUPPLY CURRENT (mA)
AMBIENT TEMPERATURE (°C)
–55
10
OUTPUT RESISTANCE (Ω)
30
40
50
60
70
80
25 50 100 125
1046 G03
20
–25 0 75
C1 = C2 = 10µF
V
+
= 2V, C
OSC
= 0pF
V
+
= 5V, C
OSC
= 0pF
OSCILLATOR FREQUENCY, f
OSC
(Hz)
100
0
OUTPUT RESISTANCE, R
O
(Ω)
200
300
400
500
1k 10k 100k
1046 G01
100
T
A
= 25°C
V
+
= 5V
I
L
= 10mA
C1 = C2
= 1µF
C1 = C2
= 10µF
C1 = C2
= 100µF
CCHARA TERIST
ICS
UW
AT
Y
P
I
CA
LPER
F
O
R
C
E
(Using Test Circuit in Figure 1)
Output Resistance vs Output Resistance vs Output Resistance vs
Oscillator Frequency Supply Voltage Temperature
Power Conversion Efficiency vs Power Conversion Efficiency vs Power Conversion Efficiency vs
Load Current for V
+
= 2V Load Current for V
+
= 5V Oscillator Frequency
SUPPLY VOLTAGE, V
+
(V)
0
10
OUTPUT RESISTANCE, R
O
(Ω)
100
1000
2567
1046 G02
134
T
A
= 25°C
I
L
= 3mA
C
OSC
= 100pF
C
OSC
= 0pF
Note 1: Absolute Maximum Ratings are those values beyond which
the life of the device may be impaired.
Note 2: Connecting any input terminal to voltages greater than V
+
or
less than ground may cause destructive latch-up. It is recommended
that no inputs from sources operating from external supplies be
applied prior to power-up of the LTC1046.
Note 3: R
OUT
is measured at T
J
= 25°C immediately after power-on.
Note 4: f
OSC
is tested with C
OSC
= 100pF to minimize the effects of test
fixture capacitance loading. The 0pF frequency is correlated to this 100pF
test point, and is intended to simulate the capacitance at pin 7 when the
device is plugged into a test socket and no external capacitor is used.
E
LECTR
IC
AL C CHARA TERIST
ICS
P1-P3P4-P6P7-P9P10-P12

LTC1046CN8#PBF

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Buy LTC1046CN8#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Switched Cap Volt Conv 50mA
Lifecycle:
New from this manufacturer.
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