LTC1046
“Inductorless”
5V to –5V Converter
FEATURES
DESCRIPTION
50mA Output Current
nn Plug-In Compatible with ICL7660/LTC1044
nn R
OUT = 35Ω Maximum
nn 300μA Maximum No Load Supply Current at 5V
nn Boost Pin (Pin 1) for Higher Switching Frequency
nn 97% Minimum Open-Circuit Voltage Conversion
Efficiency
nn 95% Minimum Power Conversion Efficiency
nn Wide Operating Supply Voltage Range: 1.5V to 6V
nn Easy to Use
nn Low Cost
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 (VOUT = – VIN), divided
(VOUT = VIN/2) or multiplied (VOUT = ±nVIN).
nn
APPLICATIONS
Designed to be pin-for-pin and functionally compatible
with the ICL7660 and LTC1044, the LTC1046 provides
2.5 times the output drive capability.
All registered trademarks and trademarks are the property of their respective owners.
Conversion of 5V to ± 5V Supplies
Precise Voltage Division, VOUT = VIN /2
nn Supply Splitter, V
OUT = ± VS /2
nn
nn
TYPICAL APPLICATION
Output Voltage vs Load Current for V + = 5V
Generating – 5V from 5V
–5
TA = 25°C
LTC1046
10µF
+
2
3
4
BOOST
CAP +
GND
CAP –
V+
OSC
LV
VOUT
8
5V INPUT
7
6
5
–5V OUTPUT
10µF
+
1046 TA01
–4
OUTPUT VOLTAGE (V)
1
ICL7660/LTC1044,
ROUT = 55Ω
–3
LTC1046,
ROUT = 27Ω
–2
–1
0
0
10
20
30
40
LOAD CURRENT, IL (mA)
50
1046 TA02
Rev. C
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1
LTC1046
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Supply Voltage..........................................................6.5V
Input Voltage on Pins 1, 6 and 7
(Note 2)..................................– 0.3 < VIN < (V+) +0.3V
Current into Pin 6.....................................................20µA
Output Short Circuit Duration
(V+ ≤ 6V).................................................... Continuous
Operating Temperature Range
LTC1046C.........................................0°C ≤ TA ≤ 70°C
LTC1046I......................................–40°C ≤ TA ≤ 85°C
LTC1046M (OBSOLETE).................. –55°C to 125°C
Storage Temperature Range.................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec.).................. 300°C
PIN CONFIGURATION
TOP VIEW
BOOST 1
CAP +
8
2
7
OSC
GND 3
6
LV
5
VOUT
CAP –
4
TOP VIEW
TOP VIEW
V+
J8 PACKAGE
8-LEAD CERDIP
BOOST 1
8
V+
CAP + 2
7
OSC
GND 3
6
LV
CAP – 4
5
VOUT
8
V+
CAP + 2
7
OSC
GND 3
6
LV
CAP – 4
5
VOUT
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 110°C, θJA = 130°C (N8)
TJMAX = 150°C, θJA = 150°C
TJMAX = 160°C, θJA = 100°C
OBSOLETE PACKAGE
BOOST 1
Consider the N8 or S8 for Alternate Source
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
LTC1046CN8#PBF
PART MARKING
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC1046CN8#TRPBF
8-Lead PDIP
0°C to 70°C
LTC1046IN8#PBF
LTC1046IN8#TRPBF
8-Lead PDIP
–40°C to 85°C
LTC1046MJ8#PBF
LTC1046MJ8#TRPBF
LTC1046CS8#PBF
LTC1046CS8#TRPBF
LTC1046IS8#PBF
LTC1046IS8#TRPBF
OBSOLETE PACKAGE
8-Lead CERDIP
–55°C to 125°C
1046
8-Lead Plastic SO
0°C to 70°C
1046I
8-Lead Plastic SO
–40°C to 85°C
Contact the factory for parts specified with wider operating temperature ranges.
Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.
Rev. C
2
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LTC1046
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. V+ = 5V, COSC = 0pF, unless otherwise noted.
LTC1046C
SYMBOL
PARAMETER
IS
Supply Current
RL = ∞, Pins 1 and 7 No Connection
RL = ∞, Pins 1 and 7 No Connection,
V+ = 3V
V+L
Minimum Supply Voltage
RL = 5kΩ
l
V+
Maximum Supply Voltage
RL = 5kΩ
l
Output Resistance
V+ = 5V, I
H
ROUT
CONDITIONS
MIN
L = 50mA (Note 3)
V+ = 2V, IL = 10mA
LTC1046I/M
TYP
MAX
165
35
300
1.5
MIN
TYP
MAX
UNITS
165
35
300
µA
µA
1.5
V
6
27
27
60
l
l
35
45
85
27
27
60
6
V
35
50
90
Ω
Ω
Ω
fOSC
Oscillator Frequency
V+ = 5V (Note 4)
V+ = 2V
20
4
30
5.5
20
4
30
5.5
kHz
kHz
PEFF
Power Efficiency
RL = 2.4kΩ
95
97
95
97
%
VOUTEFF
Voltage Conversion Efficiency
RL = ∞
97
99.9
97
99.9
%
IOSC
Oscillator Sink or Source
Current
= 0V or V+
VOSC
Pin 1 = 0V
Pin 1 = V+
l
l
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.
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.
4.2
15
35
45
4.2
15
40
50
µA
µA
Note 3: ROUT is measured at TJ = 25°C immediately after power-on.
Note 4: fOSC is tested with COSC = 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.
Rev. C
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3
LTC1046
TYPICAL PERFORMANCE CHARACTERISTICS
Output Resistance vs
Supply Voltage
1000
TA = 25°C
V + = 5V
IL = 10mA
300
C1 = C2
= 1µF
C1 = C2
= 10µF
C1 = C2
= 100µF
100
0
100
1k
10k
80
TA = 25°C
IL = 3mA
COSC = 100pF
100
COSC = 0pF
10
1
0
OSCILLATOR FREQUENCY, fOSC (Hz)
2
3
4
5
SUPPLY VOLTAGE, V + (V)
1046 G01
8
70
7
IS
6
50
5
40
4
20
10
0
3
TA = 25°C
V + = 2V
C1 = C2 = 10µF
fOSC = 8kHz
0
1
2
3 4 5 6 7 8
LOAD CURRENT, IL (mA)
9
2
1
10
0
90
80
70
60
60
50
50
IS
30
10
0
40
0
10
20
50
30
40
LOAD CURRENT, IL (mA)
–2.5
0
2
4
0
2
1
0
–1
–2
–4
6 8 10 12 14 16 18 20
LOAD CURRENT, IL (mA)
1046 G07
A = 100µF, 1mA
B = 100µF, 15mA
C = 10µF, 1mA
D = 10µF, 15mA
E = 1µF, 1mA
F = 1µF, 15mA
A
96
94
C
92
V + = 5V
TA = 25°C
C1 = C2
B
90
E
88
86
D
84
F
82
80
100
1k
10k
100k
OSCILLATOR FREQUENCY, fOSC (Hz)
–5
SLOPE = 27Ω
0
10 20 30 40 50 60 70 80 90 100
LOAD CURRENT, IL (mA)
1046 G08
1M
1046 G06
Oscillator Frequency as a
Function of COSC
100
–3
SLOPE = 52Ω
–2.0
70
OSCILLATOR FREQUENCY, fOSC (kHz)
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
3
–1.0
10
TA = 25°C
V + = 5V
fOSC = 30kHz
C1 = C2 = 10µF
4
0.0
60
20
98
Output Voltage vs Load Current
for V+ = 5V
5
–0.5
30
TA = 25°C
V + = 5V
C1 = C2 = 10µF
fOSC = 30kHz
20
100
90
70
40
125
1046 G03
1046 G05
2.5
0.5
–25
0
75 100
25
50
AMBIENT TEMPERATURE (°C)
Power Conversion Efficiency vs
Oscillator Frequency
PEFF
80
Output Voltage vs Load Current
for V+ = 2V
–1.5
10
–55
100
1046 G04
TA = 25°C
2.0 V + = 2V
fOSC = 8kHz
1.5 C1
= C2 = 10µF
1.0
V + = 5V, COSC = 0pF
30
7
SUPPLY CURRENT (mA)
80
30
6
100
POWER CONVERSION EFFICIENCY, PEFF (%)
9
SUPPLY CURRENT (mA)
POWER CONVERSION EFFICIENCY, PEFF (%)
10
60
40
Power Conversion Efficiency vs
Load Current for V+ = 5V
PEFF
V + = 2V, COSC = 0pF
50
1046 G02
Power Conversion Efficiency vs
Load Current for V+ = 2V
90
60
20
100k
100
C1 = C2 = 10µF
70
POWER CONVERSION EFFICIENCY, PEFF (%)
400
OUTPUT RESISTANCE, RO (Ω)
OUTPUT RESISTANCE, RO (Ω)
500
Output Resistance vs
Temperature
OUTPUT RESISTANCE (Ω)
Output Resistance vs
Oscillator Frequency
200
(Using Test Circuit in Figure 1)
V + = 5V
TA = 25°C
PIN 1 = V +
10
1
PIN 1 = OPEN
0.1
1000
1
10
100
10000
EXTERNAL CAPACITOR (PIN 7 TO GND), COSC (pF)
1046 G09
Rev. C
4
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LTC1046
TYPICAL PERFORMANCE CHARACTERISTICS
Oscillator Frequency as a
Function of Supply Voltage
Oscillator Frequency vs
Temperature
40
TA = 25°C
COSC = 0pF
OSCILLATOR FREQUENCY, fOSC (kHz)
OSCILLATOR FREQUENCY, fOSC (kHz)
100
10
1
0
1
(Using Test Circuit in Figure 1)
2
3
6
4
5
AMBIENT TEMPERATURE (°C)
38
36
34
32
30
28
26
–55
7
V + = 5V
COSC = 0pF
–25
0
75 100
25
50
AMBIENT TEMPERATURE (°C)
125
1046 G11
1046 G10
TEST CIRCUIT
V + (5V)
LTC1046
+
C1
10µF
2
3
4
BOOST
CAP +
GND
CAP –
V+
OSC
LV
VOUT
IS
8
7
EXTERNAL
OSCILLATOR
6
IL
RL
5
COSC
+
1
VOUT
C2
10µF
1046 F01
Figure 1
Rev. C
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5
LTC1046
APPLICATIONS INFORMATION
Theory of Operation
To understand the theory of operation of the LTC1046,
a review of a basic switched capacitor building block is
helpful.
In Figure 2, when the switch is in the left position, capacitor C1 will charge to voltage V1. The total charge on C1
will be q1 = C1V1. The switch then moves to the right,
discharging C1 to voltage V2. After this discharge time,
the charge on C1 is q2 = C1V2. Note that charge has been
transferred from the source, V1, to the output, V2. The
amount of charge transferred is:
Δq = q1 – q2 = C1(V1 – V2).
If the switch is cycled “f” times per second, the charge
transfer per unit time (i.e., current) is:
V2
f
C1
RL
C2
For example, if you examine power conversion efficiency
as a function of frequency (see typical curve), this simple
theory will explain how the LTC1046 behaves. The loss,
and hence the efficiency, is set by the output impedance.
As frequency is decreased, the output impedance will
eventually be dominated by the 1/fC1 term and power efficiency will drop. The typical curves for power efficiency
versus frequency show this effect for various capacitor
values.
Note also that power efficiency decreases as frequency
goes up. This is caused by internal switching losses which
occur due to some finite charge being lost on each switching cycle. This charge loss per unit cycle, when multiplied
by the switching frequency, becomes a current loss. At
high frequency this loss becomes significant and the
power efficiency starts to decrease.
I = f • Δq = f • C1(V1 – V2).
V1
Examination of Figure 4 shows that the LTC1046 has
the same switching action as the basic switched capacitor building block. With the addition of finite switch ON
resistance and output voltage ripple, the simple theory,
although not exact, provides an intuitive feel for how the
device works.
1046 F02
Figure 2. Switched Capacitor Building Block
Rewriting in terms of voltage and impedance equivalence,
I=
V1 – V 2
(1 / fC1)
=
V1 – V 2
REQUIV
V+
(8)
.
SW1
BOOST
A new variable, REQUIV, has been defined such that
REQUIV = 1/fC1. Thus, the equivalent circuit for the
switched capacitor network is as shown in Figure 3.
φ
3x
(1)
OSC
+
C1
+2
φ
OSC
(7)
SW2
CAP +
(2)
CAP –
(4)
VOUT
(5)
+
V1
REQUIV
REQUIV = 1
fC1
LV
(6)
V2
C2
RL
CLOSED WHEN
V + > 3.0V
GND
(3)
C2
1046 F04
Figure 4. LTC1046 Switched Capacitor Voltage Converter
Block Diagram
1046 F03
Figure 3. Switched Capacitor Equivalent Circuit
Rev. C
6
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LTC1046
APPLICATIONS INFORMATION
LV (Pin 6)
The internal logic of the LTC1046 runs between V+ and
LV (Pin 6). For V+ greater than or equal to 3V, an internal
switch shorts LV to GND (Pin 3). For V+ less than 3V,
the LV pin should be tied to ground. For V+ greater than
or equal to 3V, the LV pin can be tied to ground or left
floating.
OSC (Pin 7) and BOOST (Pin 1)
The switching frequency can be raised, lowered or driven
from an external source. Figure 5 shows a functional diagram of the oscillator circuit.
By connecting the BOOST (Pin 1) to V+, the charge and
discharge current is increased and, hence, the frequency
is increased by approximately three times. Increasing the
frequency will decrease output impedance and ripple for
higher load currents.
Loading Pin 7 with more capacitance will lower the frequency. Using the BOOST pin in conjunction with external capacitance on Pin 7 allows user selection of the frequency over a wide range.
Driving the LTC1046 from an external frequency source
can be easily achieved by driving Pin 7 and leaving the
BOOST pin open, as shown in Figure 6. The output current from Pin 7 is small, typically 15μA, so a logic gate
is capable of driving this current. The choice of using a
V+
2I
I
BOOST
(1)
CMOS logic gate is best because it can operate over a
wide supply voltage range (3V to 15V) and has enough
voltage swing to drive the internal Schmitt trigger shown
in Figure 5. For 5V applications, a TTL logic gate can be
used by simply adding an external pull-up resistor (see
Figure 6).
Capacitor Selection
While the exact values of CIN and COUT are noncritical,
good quality, low ESR capacitors such as solid tantalum
are necessary to minimize voltage losses at high currents. For CIN the effect of the ESR of the capacitor will
be multiplied by four, due to the fact that switch currents
are approximately two times higher than output current,
and losses will occur on both the charge and discharge
cycle. This means that using a capacitor with 1Ω of ESR
for CIN will have the same effect as increasing the output
impedance of the LTC1046 by 4Ω. This represents a significant increase in the voltage losses. For COUT the effect
of ESR is less dramatic. COUT is alternately charged and
discharged at a current approximately equal to the output
current, and the ESR of the capacitor will cause a step
function to occur, in the output ripple, at the switch transitions. This step function will degrade the output regulation for changes in output load current, and should be
avoided. Realizing that large value tantalum capacitors
can be expensive, a technique that can be used is to parallel a smaller tantalum capacitor with a large aluminum
electrolytic capacitor to gain both low ESR and reasonable
cost. Where physical size is a concern some of the newer
chip type surface mount tantalum capacitors can be used.
These capacitors are normally rated at working voltages
in the 10V to 20V range and exhibit very low ESR (in the
range of 0.1Ω).
REQUIRED FOR TTL LOGIC
V+
LTC1046
OSC
(7)
~14pF
C1
+
1
2
3
4
I
LV
(6)
BOOST
CAP +
GND
CAP –
V+
OSC
LV
VOUT
8
7
100k
OSC INPUT
6
5
–(V +)
+
2I
NC
SCHMITT
TRIGGER
1046 F05
C2
1046 F06
Figure 5. Oscillator
Figure 6. External Clocking
Rev. C
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7
LTC1046
TYPICAL APPLICATIONS
Negative Voltage Converter
Figure 7 shows a typical connection which will provide
a negative supply from an available positive supply. This
circuit operates over full temperature and power supply
ranges without the need of any external diodes. The LV
pin (Pin 6) is shown grounded, but for V+ ≥ 3V, it may
be floated, since LV is internally switched to GND (Pin 3)
for V+ ≥ 3V.
The output voltage (Pin 5) characteristics of the circuit
are those of a nearly ideal voltage source in series with an
27Ω resistor. The 27Ω output impedance is composed of
two terms: 1) the equivalent switched capacitor resistance
(see Theory of Operation), and 2) a term related to the ON
resistance of the MOS switches.
At an oscillator frequency of 30kHz and C1 = 10μF, the
first term is:
REQUIV =
(
1
)
fOSC / 2 • C1
on the typical curves of output impedance and power efficiency versus frequency. For C1 = C2 = 10μF, the output
impedance goes from 27Ω at fOSC = 30kHz to 225Ω at
fOSC = 1kHz. As the 1/fC term becomes large compared
to switch ON resistance term, the output resistance is
determined by 1/fC only.
Voltage Doubling
Figure 8 shows a two diode, capacitive voltage doubler.
With a 5V input, the output is 9.1V with no load and 8.2V
with a 10mA load.
LTC1046
1
2
3
4
V+
BOOST
CAP +
OSC
LV
GND
CAP –
VOUT
8
7
6
5
V+
1.5V TO 6V
+
VD
REQUIRED
FOR
V + < 3V
+
+
VD
10µF
VOUT = 2
(VIN – 1)
+
=
10µF
1046 F08
Figure 8. Voltage Doubler
1
= 6.7Ω.
15 • 103 • 10 • 10 –6
Notice that the equation for REQUIV is not a capacitive
reactance equation (XC = 1/ωC) and does not contain a
2π term.
The exact expression for output impedance is complex,
but the dominant effect of the capacitor is clearly shown
Ultraprecision Voltage Divider
An ultraprecision voltage divider is shown in Figure 9. To
achieve the 0.0002% accuracy indicated, the load current
should be kept below 100nA. However, with a slight loss
in accuracy, the load current can be increased.
LTC1046
1
LTC1046
10µF
+
2
3
4
BOOST
CAP +
GND
CAP –
V+
OSC
LV
VOUT
V+
1.5V TO 6V
8
7
6
REQUIRED FOR V + < 3V
5
VOUT = –V +
TMIN ≤ TA ≤ TMAX
+
1
10µF
1046 F07
Figure 7. Negative Voltage Converter
C1
10µF
2
+
V+
±0.002%
2
TMIN ≤ TA ≤ TMAX
IL ≤ 100nA
3
4
+
BOOST
CAP +
GND
CAP –
V+
OSC
LV
VOUT
8
7
V+
3V TO 12V
6
5
1046 F09
C2
10µF
REQUIRED FOR V + < 6V
Figure 9. Ultrtaprecision Voltage Divider
Rev. C
8
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LTC1046
TYPICAL APPLICATIONS
Battery Splitter
Paralleling for Lower Output Resistance
A common need in many systems is to obtain positive
and negative supplies from a single battery or single
power supply system. Where current requirements are
small, the circuit shown in Figure 10 is a simple solution.
It provides symmetrical positive or negative output voltages, both equal to one half the input voltage. The output
voltages are both referenced to Pin 3 (output common). If
the input voltage between Pin 8 and Pin 5 is less than 6V,
Pin 6 should also be connected to Pin 3, as shown by the
dashed line.
Additional flexibility of the LTC1046 is shown in Figures
Figure 11 and Figure 12. Figure 11 shows two LTC1046s
connected in parallel to provide a lower effective output
resistance. If, however, the output resistance is dominated
by 1/fC1, increasing the capacitor size (C1) or increasing
the frequency will be of more benefit than the paralleling
circuit shown.
Figure 12 makes use of “stacking” two LTC1046s to provide even higher voltages. In Figure 12, a negative voltage
doubler or tripler can be achieved depending upon how
Pin 8 of the second LTC1046 is connected, as shown
schematically by the switch.
LTC1046
1
C1
10µF
2
+
3
4
V+
CAP +
OSC
LV
GND
CAP –
VOUT
8
+VB /2
4.5V
7
REQUIRED FOR VB < 6V
6
5
–VB /2
–4.5V
+
3V ≤ VB ≤ 12V
C2
10µF
OUTPUT COMM0N
1046 F10
Figure 10. Battery Splitter
LTC1046
1
C1
10µF
2
+
3
4
V+
BOOST
CAP +
OSC
LV
GND
CAP –
V+
LTC1046
VOUT
1
8
7
6
C1
10µF
5
2
+
3
4
V+
BOOST
CAP +
OSC
LV
GND
CAP –
VOUT
8
7
6
5
VOUT = –(V +)
1/4 CD4077
+
OPTIONAL SYNCHRONIZATION
CIRCUIT TO MINIMIZE RIPPLE
C2
20µF
1046 F11
Figure 11. Paralleling for 100mA Load Current
FOR VOUT = –3V +
V+
LTC1046
3
4
BOOST
CAP +
GND
CAP –
V
OSC
LV
VOUT
7
+
10µF
+
2
C1
10µF
+ 8
LTC1046
1
2
6
3
5
4
–(V +)
10µF
BOOST
CAP +
GND
CAP –
V+
OSC
LV
VOUT
+
1
FOR VOUT = –2V +
8
7
6
5
+
VB
9V
BOOST
VOUT
10µF
1046 F12
Figure 12. Stacking for Higher Voltage
Rev. C
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9
LTC1046
PACKAGE DESCRIPTION
J8 Package
8-Lead CERDIP (Narrow .300 Inch, Hermetic)
(Reference LTC DWG # 05-08-1110)
CORNER LEADS OPTION
(4 PLCS)
.023 – .045
(0.584 – 1.143)
HALF LEAD
OPTION
.045 – .068
(1.143 – 1.650)
FULL LEAD
OPTION
.005
(0.127)
MIN
.405
(10.287)
MAX
8
7
6
5
.025
(0.635)
RAD TYP
.220 – .310
(5.588 – 7.874)
1
.300 BSC
(7.62 BSC)
2
3
4
.200
(5.080)
MAX
.015 – .060
(0.381 – 1.524)
.008 – .018
(0.203 – 0.457)
0° – 15°
NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE
OR TIN PLATE LEADS
.045 – .065
(1.143 – 1.651)
.014 – .026
(0.360 – 0.660)
.100
(2.54)
BSC
.125
3.175
MIN
J8 0801
OBSOLETE PACKAGE
Rev. C
10
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LTC1046
PACKAGE DESCRIPTION
N Package
8-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510 Rev I)
.300 – .325
(7.620 – 8.255)
.045 – .065
(1.143 – 1.651)
.065
(1.651)
TYP
.008 – .015
(0.203 – 0.381)
(
+.035
.325 –.015
8.255
+0.889
–0.381
.100
(2.54)
BSC
)
.130 ±.005
(3.302 ±0.127)
.120
(3.048) .020
MIN
(0.508)
MIN
.018 ±.003
N8 REV I 0711
(0.457 ±0.076)
.400*
(10.160)
MAX
8
7
6
5
1
2
3
4
.255 ±.015*
(6.477 ±0.381)
NOTE:
1. DIMENSIONS ARE
INCHES
MILLIMETERS
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
Rev. C
For more information www.analog.com
11
LTC1046
PACKAGE DESCRIPTION
S8 Package
8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610 Rev G)
.050 BSC
.189 – .197
(4.801 – 5.004)
NOTE 3
.045 ±.005
8
.245
MIN
.160 ±.005
.010 – .020
× 45°
(0.254 – 0.508)
NOTE:
1. DIMENSIONS IN
5
.150 – .157
(3.810 – 3.988)
NOTE 3
1
RECOMMENDED SOLDER PAD LAYOUT
.053 – .069
(1.346 – 1.752)
0°– 8° TYP
.016 – .050
(0.406 – 1.270)
6
.228 – .244
(5.791 – 6.197)
.030 ±.005
TYP
.008 – .010
(0.203 – 0.254)
7
.014 – .019
(0.355 – 0.483)
TYP
INCHES
(MILLIMETERS)
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
4. PIN 1 CAN BE BEVEL EDGE OR A DIMPLE
2
3
4
.004 – .010
(0.101 – 0.254)
.050
(1.270)
BSC
SO8 REV G 0212
Rev. C
12
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LTC1046
REVISION HISTORY
(Revision history begins at Rev C)
REV
DATE
DESCRIPTION
C
05/19
Obsolete CERDIP package
PAGE NUMBER
2, 10
Rev. C
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog
Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications
subject to change without notice. No license For
is granted
implication or
otherwise under any patent or patent rights of Analog Devices.
moreby
information
www.analog.com
13
LTC1046
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®
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5V to –5V at 20µA Supply Current, SOT-23 Package
5V/50mA, 13µA Supply Current, 2.7V to 5.5V Input Range
Rev. C
14
05/19
www.analog.com
For more information www.analog.com
ANALOG DEVICES, INC. 1991