1
LTC1044A
12V CMOS
Voltage Converter
D
U
ESCRIPTIO
S
FEATURE
U
S
A
O
PPLICATI
■
1.5V to 12V Operating Supply Voltage Range
■
13V Absolute Maximum Rating
■
200µA 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
■
I
S
= 1.5µA with 5V Supply When OSC Pin = 0V or V
+
■
High Voltage Upgrade to ICL7660/LTC1044
■
Conversion of 10V to ±10V Supplies
■
Conversion of 5V to ±5V Supplies
■
Precise Voltage Division: V
OUT
= V
IN
/2 ±20ppm
■
Voltage Multiplication: V
OUT
= ±nV
IN
■
Supply Splitter: V
OUT
= ±V
S
/2
■
Automotive Applications
■
Battery Systems with 9V Wall Adapters/Chargers
The LTC1044A is a monolithic CMOS switched-capacitor
voltage converter. It plugs in for ICL7660/LTC1044 in
applications where higher input voltage (up to 12V) is
needed. The LTC1044A provides several conversion func-
tions without using inductors. The input voltage can be
inverted (V
OUT
= –V
IN
), doubled (V
OUT
= 2V
IN
), divided
(V
OUT
= V
IN
/2) or multiplied (V
OUT
= ±nV
IN
).
To optimize performance in specific applications, a boost
function is available to raise the internal oscillator fre-
quency by a factor of 7. Smaller external capacitors can be
used in higher frequency operation to save board space.
The internal oscillator can also be disabled to save power.
The supply current drops to 1.5µA at 5V input when the
OSC pin is tied to GND or V
+
.
U
A
O
PPLICATITYPICAL
Generating –10V from 10V Output Voltage vs Load Current, V+ = 10V
LOAD CURRENT (mA)
0
OUTPUT VOLTAGE (V)
–4
–2
0
40
LTC1044A • TA02
–6
–8
–5
–3
–1
–7
–9
–10 10 20 30 50 60 70 80 90 100
T
A
= 25°C
C1 = C2 = 10µF
SLOPE = 45Ω
1
2
3
4
8
7
6
5
LTC1044A
V
+
OSC
LV
V
OUT
BOOST
CAP
+
GND
CAP
–
+
10µF
+
10µF
10V INPUT
–10V OUTPUT
LTC1044A • TA01
2
LTC1044A
WU
U
PACKAGE/ORDER I FOR ATIO
ABSOLUTE AXI U RATI GS
WWW U
(Note 1)
Supply Voltage ........................................................ 13V
Input Voltage on Pins 1, 6 and 7
(Note 2) .............................. –0.3V < V
IN
< V
+
+ 0.3V
Current into Pin 6 ................................................. 20µA
Output Short-Circuit Duration
V
+
≤ 6.5V .................................................Continuous
Operating Temperature Range
LTC1044AC ............................................ 0°C to 70°C
LTC1044AI ........................................ –40°C to 85°C
Storage Temperature Range ................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
ORDER PART
NUMBER
T
JMAX
= 110°C, θ
JA
= 100°C/W
ORDER PART
NUMBER
1
2
3
4
8
7
6
5
TOP VIEW
BOOST
CAP
+
GND
CAP
–
V
+
OSC
LV
V
OUT
N8 PACKAGE
8-LEAD PLASTIC DIP
S8 PART MARKING
LTC1044ACN8
LTC1044AIN8
LTC1044ACS8
LTC1044AIS8
1044A
1044AI
T
JMAX
= 110°C, θ
JA
= 130°C/W
1
2
3
4
8
7
6
5
TOP VIEW
V
+
OSC
LV
V
OUT
BOOST
CAP
+
GND
CAP
–
S8 PACKAGE
8-LEAD PLASTIC SOIC
LTC1044AC LTC1044AI
SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
I
S
Supply Current R
L
= ∞, Pins 1 and 7, No Connection 60 200 60 200 µA
R
L
= ∞, Pins 1 and 7, No Connection, 15 15 µA
V
+
= 3V
Minimum Supply Voltage R
L
= 10k ●1.5 1.5 V
Maximum Supply Voltage R
L
= 10k ●12 12 V
R
OUT
Output Resistance I
L
= 20mA, f
OSC
= 5kHz 100 100 Ω
●120 130 Ω
V
+
= 2V, I
L
= 3mA, f
OSC
= 1kHz ●310 325 Ω
f
OSC
Oscillator Frequency V
+
= 5V, (Note 3) ●5 5 kHz
V
+
= 2V ●1 1 kHz
P
EFF
Power Efficiency R
L
= 5k, f
OSC
= 5kHz 95 98 95 98 %
Voltage Conversion Efficiency R
L
= ∞97 99.9 97 99.9 %
Oscillator Sink or Source V
OSC
= 0V or V
+
Current Pin 1 (BOOST) = 0V ●33µA
Pin 1 (BOOST) = V
+
●20 20 µA
ELECTRICAL C CHARA TERISTICS
V+ = 5V, COSC = 0pF, TA = 25°C, See Test Circuit, unless otherwise noted.
The ● denotes specifications which apply over the full operating
temperature range; all other limits and typicals T
A
= 25°C.
Note 1: Absolute maximum ratings are those values beyond which the life
of a 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 LTC1044A.
Note 3: 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.
Consult factory for Military grade parts
3
LTC1044A
Operating Voltage Range
vs Temperature
CCHARA TERISTICS
UW
AT
Y
P
I
CALPER
F
O
RC
E
AMBIENT TEMPERATURE (°C)
–55
8
10
14
25 75
LTC1044A • TPC01
6
4
–25 0 50 100 125
2
0
12
SUPPLY VOLTAGE (V)
Power Efficiency vs
Oscillator Frequency, V+ = 5V
OSCILLATOR FREQUENCY (Hz)
100
88
POWER EFFICIENCY (%)
90
92
94
96
1k 10k 100k
LTC1044A • G02
86
84
82
80
98
100
100µF
100µF
10µF
10µF
1µF
1µF
I
L
= 1mA
I
L
= 15mA
T
A
= 25°C
C1 = C2
Output Resistance vs
Oscillator Frequency, V+ = 5V
OSCILLATOR FREQUENCY (Hz)
100
200
OUTPUT RESISTANCE (Ω)
300
400
1k 10k 100k
LTC1044A • TPC04
100
0
500 TA = 25°C
IL = 10mA
C1 = C2 = 10µF
C1 = C2 = 1µF
C1 = C2 = 100µF
LOAD CURRENT (mA)
0
0
POWER CONVERSION EFFICIENCY (%)
SUPPLY CURRENT (mA)
10
30
40
50
100
70
245
LTC1044A • TPC06
20
80
90 P
EFF
I
S
60
0
1
3
4
5
10
7
2
8
9
6
1367
T
A
= 25°C
C1 = C2 = 10µF
f
OSC
= 1kHz
Output Resistance vs
Oscillator Frequency, V+ = 10V
OSCILLATOR FREQUENCY (Hz)
100
200
OUTPUT RESISTANCE (Ω)
300
400
1k 10k 100k
LTC1044A • TPC05
100
0
500 T
A
= 25°C
I
L
= 10mA
C1 = C2 = 1µF
C1 = C2 
= 100µFC1 = C2 
= 10µF
Power Conversion Efficiency
vs Load Current, V+ = 2V
Power Conversion Efficiency
vs Load Current, V+ = 5V
LOAD CURRENT (mA)
0
0
POWER CONVERSION EFFICIENCY (%)
SUPPLY CURRENT (mA)
10
30
40
50
100
70
20 40 50
LTC1044A • TPC07
20
80
90 P
EFF
I
S
60
0
10
30
40
50
100
70
20
80
90
60
10 30 60 70
T
A
= 25°C
C1 = C2 = 10µF
f
OSC
= 5kHz
LOAD CURRENT (mA)
0
0
POWER CONVERSION EFFICIENCY (%)
SUPPLY CURRENT (mA)
10
30
40
50
100
70
40 80 100
LTC1044A • TPC08
20
80
90 P
EFF
I
S
60
0
30
90
120
150
300
210
60
240
270
180
20 60 120 140
T
A
= 25°C
C1 = C2 = 10µF
f
OSC
= 20kHz
Power Conversion Efficiency
vs Load Current, V+ = 10V
Using the Test Circuit
Power Efficiency vs
Oscillator Frequency, V+ = 10V
OSCILLATOR FREQUENCY (Hz)
100
POWER EFFICIENCY (%)
1k 10k 100k
LTC1044A • TPC03
T
A
= 25°C
C1 = C2
100µFI
L
= 1mA
10µF10µF
1µF 1µF
88
90
92
94
96
86
84
82
80
98
100
100µF
I
L
= 15mA
4
LTC1044A
Output Resistance
vs Supply Voltage
CCHARA TERISTICS
UW
AT
Y
P
I
CALPER
F
O
RC
E
Output Voltage
vs Load Current, V+ = 5V
Output Voltage
vs Load Current, V+ = 2V
SUPPLY VOLTAGE (V)
1
OUTPUT RESISTANCE (Ω)
3
1000
LTC1044A • TPC09
10
100
2101112
9
876
5
4
0
T
A
= 25°C
I
L
= 3mA
C
OSC
= 100pF
C
OSC
= 0pF
LOAD CURRENT (mA)
0
OUTPUT VOLTAGE (V)
0.5
1.5
2.5
8
LTC1044A • TPC10
–0.5
–1.5
0
1.0
2.0
–1.0
–2.0
–2.5 24610
7
1359
T
A
= 25°C
f
OSC
= 1kHz
SLOPE = 250Ω
LOAD CURRENT (mA)
0
OUTPUT VOLTAGE (V)
1
3
5
80
LTC1044A • TPC11
–1
–3
0
2
4
–2
–4
–5 20 40 60 100
70
10 30 50 90
T
A
= 25°C
f
OSC
= 5kHz
SLOPE = 80Ω
Output Voltage
vs Load Current, V+ = 10V Oscillator Frequency as a
Function of COSC, V+ = 5V
Output Resistance
vs Temperature
LOAD CURRENT (mA)
0
OUTPUT VOLTAGE (V)
2
6
10
40
LTC1044A • TPC12
–2
–6
0
4
8
–4
–8
–10 10 20 30 50 60 70 80 90 100
T
A
= 25°C
f
OSC
= 20kHz
SLOPE = 45Ω
AMBIENT TEMPERATURE (°C)
–55
0
OUTPUT RESISTANCE (Ω)
40
120
160
200
400
280
050 75
LTC1044A • TPC13
80
320
360
240
–25 25 100 125
V
+
= 2V, f
OSC
= 1kHz
C1 = C2 = 10µF
V
+
= 5V, f
OSC
= 5kHz
V
+
= 10V, f
OSC
= 20kHz
EXTERNAL CAPACITOR (PIN 7 TO GND)(pF)
1 10
10
OSCILLATOR FREQUENCY (Hz)
1k
100k
100 1000 10000
LTC1044A • TPC14
100
10k
T
A
= 25°C
PIN 1 = V
+
PIN 1 = OPEN
Oscillator Frequency as a
Function of COSC, V+ = 10V Oscillator Frequency
vs Temperature
Oscillator Frequency
vs Supply Voltage
EXTERNAL CAPACITOR (PIN 7 TO GND)(pF)
1 10
10
OSCILLATOR FREQUENCY (Hz)
1k
100k
100 1000 10000
LTC1044A • TPC15
100
10k
V
+
= 10V
T
A
= 25°C
PIN 1 = V
+
PIN 1 = OPEN
SUPPLY VOLTAGE (V)
0123
OSCILLATOR FREQUENCY (Hz)
1k
10k
100k
456789101112
LTC1044A • G16
0.1k
T
A
= 25°C
C
OSC
= 0pF
AMBIENT TEMPERATURE (°C)
–55
20
25
35
25 75
LTC1044A • TPC17
15
10
–25 0 50 100 125
5
0
30
OSCILLATOR FREQUENCY (kHz)
V
+
= 10V
V
+
= 5V
C
OSC
= 0pF
Using the Test Circuit
5
LTC1044A
1
2
3
4
8
7
6
5
LTC1044A
V
+
(5V)
+
C1
10µF
+
C2
10µF
C
OSC
V
OUT
R
L
I
S
I
L
EXTERNAL
OSCILLATOR
LTC1044A • TC
U
S
A
O
PPLICATI
WU
U
I FOR ATIO
Theory of Operation
To understand the theory of operation of the LTC1044A, a
review of a basic switched-capacitor building block is
helpful.
In Figure 1, 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, discharg-
ing 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:
∆q = q1 – q2 = C1(V1 – V2)
If the switch is cycled f times per second, the charge
transfer per unit time (i.e., current) is:
I = f × ∆q = f × C1(V1 – V2)
V1
LTC1044A • F01
V2
C1
f
C2
R
L
Figure 1. Switched-Capacitor Building Block
Rewriting in terms of voltage and impedance equivalence,
I = =
V1 – V2
1/(f × C1) V1 – V2
R
EQUIV
A new variable, R
EQUIV
, has been defined such that R
EQUIV
= 1/(f × C1). Thus, the equivalent circuit for the switched-
capacitor network is as shown in Figure 2.
V1
LTC1044A • F02
V2
C2 R
L
R
EQUIV
R
EQUIV
=1
f × C1
Figure 2. Switched-Capacitor Equivalent Circuit
Examination of Figure 3 shows that the LTC1044A has the
same switching action as the basic switched-capacitor
building block. With the addition of finite switch-on resis-
tance and output voltage ripple, the simple theory al-
though not exact, provides an intuitive feel for how the
device works.
For example, if you examine power conversion efficiency
as a function of frequency (see typical curve), this simple
theory will explain how the LTC1044A 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/(f × C1) term, and power
efficiency will drop. The typical curves for Power Effi-
ciency vs 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.
TEST CIRCUIT
6
LTC1044A
U
S
A
O
PPLICATI
WU
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I FOR ATIO
LV (Pin 6)
The internal logic of the LTC1044A 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 GND. For V
+
greater than or equal
to 3V, the LV pin can be tied to GND or left floating.
OSC (Pin 7) and Boost (Pin 1)
The switching frequency can be raised, lowered, or driven
from an external source. Figure 4 shows a functional
diagram of the oscillator circuit.
By connecting the boost pin (pin 1) to V
+
, the charge and
discharge current is increased and hence, the frequency is
increased by approximately 7 times. Increasing the
7X
(1)
LV
(6)
V
+
(8)
OSC ÷2
OSC
(7)
C
+
(2)
BOOST
C
–
(4) V
OUT
(5)
GND
(3)
+
C1
C2
LTC1044A • F03
φ
φ
SW1 SW2
CLOSED WHEN
V
+
> 3V
+
Figure 3. LTC1044A Switched-Capacitor Voltage Converter Block Diagram
Figure 4. Oscillator
BOOST
(1)
LV
(6)
OSC
(7)
V
+
6I I
6I
~14pF
LTC1044A • F04
SCHMITT
TRIGGER
I
frequency will decrease output impedance and ripple for
higher load currents.
Loading pin 7 with more capacitance will lower the fre-
quency. Using the boost (pin 1) in conjunction with exter-
nal capacitance on pin 7 allows user selection of the
frequency over a wide range.
Driving the LTC1044A from an external frequency source
can be easily achieved by driving pin 7 and leaving the
boost pin open as shown in Figure 5. The output current
from pin 7 is small (typically 0.5µA) so a logic gate is
capable of driving this current. The choice of using a
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
4. For 5V applications, a TTL logic gate can be used by
simply adding an external pull-up resistor (see Figure 5).
1
2
3
4
8
7
6
5
LTC1044A
V
+
–(V
+
)
+
C1
NC
OSC INPUT
C2
100k
REQUIRED FOR
TTL LOGIC
LTC1044A • F05
+
Figure 5. External Clocking
7
LTC1044A
Capacitor Selection
External capacitors C1 and C2 are not critical. Matching
is not required, nor do they have to be high quality or
tight tolerance. Aluminum or tantalum electrolytics are
excellent choices with cost and size being the only
consideration.
Negative Voltage Converter
Figure 6 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 ground (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 80Ω
resistor. The 80Ω output impedance is composed of two
terms:
1. The equivalent switched-capacitor resistance (see
Theory of Operation).
2. A term related to the on-resistance of the MOS
switches.
At an oscillator frequency of 10kHz and C1 = 10µF, the first
term is:
R
EQUIV
=
= = 20Ω
1
(f
OSC
/2) × C1
1
5 × 10
3
× 10 × 10
–6
Notice that the above equation for R
EQUIV
is
not
a capaci-
tive reactance equation (X
C
= 1/ωC) and does not contain
a 2π term.
Figure 6. Negative Voltage Converter
The exact expression for output resistance is extremely
complex, but the dominant effect of the capacitor is clearly
shown on the typical curves of Output Resistance and
Power Efficiency vs Frequency. For C1 = C2 = 10µF, the
output impedance goes from 60Ω at f
OSC
= 10kHz to 200Ω
at f
OSC
= 1kHz. As the 1/(f × C) term becomes large
compared to the switch-on resistance term, the output
resistance is determined by 1/(f × C) only.
Voltage Doubling
Figure 7 shows a two-diode capacitive voltage doubler.
With a 5V input, the output is 9.93V with no load and 9.13V
with a 10mA load. With a 10V input, the output is 19.93V
with no load and 19.28V with a 10mA load.
Figure 7. Voltage Doubler
Ultra-Precision Voltage Divider
An ultra-precision voltage divider is shown in Figure 8. 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.
Figure 8. Ultra-Precision Voltage Divider
1
2
3
4
8
7
6
5
LTC1044A
V
OUT
= –V
+
REQUIRED FOR V
+
< 3V
V
+
(1.5V TO 12V)
T
MIN
≤ T
A
≤ T
MAX
+
+
10µF
10µF
LTC1044A • F06
1
2
3
4
8
7
6
5
LTC1044A
V
+
(3V TO 24V)
+
C1
10µF
V
+
/2 ±0.002%
+
C2
10µF
REQUIRED FOR
V
+
< 6V
LTC1044A • F08
T
MIN
≤ T
A
≤ T
MAX
I
L
≤ 100nA
U
S
A
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PPLICATI
WU
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8
LTC1044A
Battery Splitter
A common need in many systems is to obtain (+) and
(–) supplies from a single battery or single power supply
system. Where current requirements are small, the circuit
shown in Figure 9 is a simple solution. It provides sym-
metrical ± output voltages, both equal to one half 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.
Paralleling for Lower Output Resistance
Additional flexibility of the LTC1044A is shown in Figures
10 and 11.
Figure 10 shows two LTC1044As connected in parallel to
provide a lower effective output resistance. If, however,
the output resistance is dominated by 1/(f × C1), increas-
ing the capacitor size (C1) or increasing the frequency will
be of more benefit than the paralleling circuit shown.
Figure 11 makes use of “stacking” two LTC1044As to
provide even higher voltages. A negative voltage doubler
or tripler can be achieved, depending upon how pin 8 of the
second LTC1044A is connected, as shown schematically
by the switch. The available output current will be dictated/
decreased by the product of the individual power conver-
sion efficiencies and the voltage step-up ratio.
1
2
3
4
8
7
6
5
LTC1044A
+V
B
/2 (6V)
+V
B
/2 (–6V)
OUTPUT
COMMON
+
C1
10µF
V
B
12V
+
C2
10µF
REQUIRED FOR V
B
< 6V
LTC1044A • F09
+
Figure 9. Battery Splitter
1
2
3
4
8
7
6
5
LTC1044A
+
C1
10µF
1
2
3
4
8
7
6
5
LTC1044A
1/4 CD4077
LTC1044A • F10
V
+
+
C1
10µF
C2
20µF
V
OUT
= –(V
+
)
+
*
*THE EXCLUSIVE NOR GATE SYNCHRONIZES BOTH LTC1044As TO MINIMIZE RIPPLE
Figure 10. Paralleling for Lower Output Resistance
Figure 11. Stacking for Higher Voltage
1
2
3
4
8
7
6
5
LTC1044A
+
+
10µF
V+
–(V+)
10µF
LTC1044A • F11
10µF
1
2
3
4
8
7
6
5
LTC1044A
+
10µF
FOR VOUT = –3V+
VOUT
FOR VOUT = –2V+
+
U
S
A
O
PPLICATI
WU
U
I FOR ATIO
9
LTC1044A
TYPICAL APPLICATIO S
U
Low Output Impedance Voltage Converter
1
2
3
4
8
7
6
5
LTC1044A
100µF–5V
1
7
3
48
5V
2
5
6
100µF
0.33µF
0.1µF
0.047µF
OUTPUT
0V TO 3.5V
0psi to 350psi
–
+
–
+
+
+
2k
GAIN
TRIM
10k
ZERO
TRIM
1.2V REFERENCE TO 
A/D CONVERTER FOR
RATIOMETRIC OPERATION
(1mA MAX)
LT1004
1.2V
46k*
100k
LT1413
LTC1044A • F13
220Ω
39k
301k*
350Ω PRESSURE
TRANSDUCER
*1% FILM RESISTOR
PRESSURE TRANSDUCER BLH/DHF-350
(CIRCLED LETTER IS PIN NUMBER)
100Ω*
D
A
E
0V
≈ –1.2V C
Single 5V Strain Gauge Bridge Signal Conditioner
LTC1044A
8
100µF
LTC1044 • F12
10µF
OUTPUT
765
123
10µF
4
+
+
+
–
+
50k
39k LM10
4
8
*V
IN
≥ –V
OUT
+ 0.5V
LOAD REGULATION ±0.02%, 0mA TO 15mA
1
6
8.2k
50k V
OUT
ADJ
7
3
V
IN
*
2
200k
200k
0.1µF
39k
10
LTC1044A
TYPICAL APPLICATIO S
U
Low Dropout 5V Regulator
Regulated Output 3V to 5V Converter
1
2
3
4
8
7
6
5
LTC1044A
+
10µF
12V
8
1N914
V
–
V
+
LT1013
2
3
461
7
30k
50k
OUTPUT
ADJUST
V
DROPOUT
AT 1mA = 1mV
V
DROPOUT
AT 10mA = 15mV
V
DROPOUT
AT 100mA = 95mV
5 FEEDBACK AMP
1N914
SHORT-CIRCUIT
PROTECTION
+
10µF
200Ω
100k
1M LOAD
LTC1044A • F15
100Ω
2N2219
120k
V
OUT
= 5V
–
+
–
+
1.2k
LT1004
1.2V
6V
4 EVEREADY
E-91 CELLS
0.01Ω
1
2
3
4
8
7
6
5
LTC1044A
+
–
+
LM10
REF
AMP
1M
7
1
6
4
8
2
3
100µF
+
10µF
3V
330k
EVEREADY
EXP-30
1N914
1N914
4.8M
5V
OUTPUT
–
+
OP
AMP
200Ω
1k
1k
150k
LTC1044A • F14
100k
11
LTC1044A
PACKAGE DESCRIPTIO
U
1234
0.150 – 0.157
(3.810 – 3.988)
8765
0.189 – 0.197
(4.801 – 5.004)
0.228 – 0.244
(5.791 – 6.197)
0.016 – 0.050
0.406 – 1.270
0.010 – 0.020
(0.254 – 0.508)
× 45°
0°– 8° TYP
0.008 – 0.010
(0.203 – 0.254)
SO8 0392
0.053 – 0.069
(1.346 – 1.752)
0.014 – 0.019
(0.355 – 0.483)
0.004 – 0.010
(0.101 – 0.254)
0.050
(1.270)
BSC
S8 Package
8-Lead Plastic SOIC
N8 Package
8-Lead Plastic DIP
N8 0392
0.045 ± 0.015
(1.143 ± 0.381)
0.100 ± 0.010
(2.540 ± 0.254)
0.065
(1.651)
TYP
0.045 – 0.065
(1.143 – 1.651)
0.130 ± 0.005
(3.302 ± 0.127)
0.020
(0.508)
MIN
0.018 ± 0.003
(0.457 ± 0.076)
0.125
(3.175)
MIN
12 34
8765
0.250 ± 0.010
(6.350 ± 0.254)
0.400
(10.160)
MAX
0.009 – 0.015
(0.229 – 0.381)
0.300 – 0.320
(7.620 – 8.128)
0.325 +0.025
–0.015
+0.635
–0.381
8.255
()
Dimensions in inches (millimeters) unless otherwise noted.
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
12
LTC1044A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
(408) 432-1900
●
FAX
: (408) 434-0507
●
TELEX
: 499-3977
LINEAR TECHNOLOGY CORPORATION 1993
NORTHEAST REGION
Linear Technology Corporation
One Oxford Valley
2300 E. Lincoln Hwy.,Suite 306
Langhorne, PA 19047
Phone: (215) 757-8578
FAX: (215) 757-5631
Linear Technology Corporation
266 Lowell St., Suite B-8
Wilmington, MA 01887
Phone: (508) 658-3881
FAX: (508) 658-2701
U.S. Area Sales Offices
SOUTHEAST REGION
Linear Technology Corporation
17060 Dallas Parkway
Suite 208
Dallas, TX 75248
Phone: (214) 733-3071
FAX: (214) 380-5138
CENTRAL REGION
Linear Technology Corporation
Chesapeake Square
229 Mitchell Court, Suite A-25
Addison, IL 60101
Phone: (708) 620-6910
FAX: (708) 620-6977
SOUTHWEST REGION
Linear Technology Corporation
22141 Ventura Blvd.
Suite 206
Woodland Hills, CA 91364
Phone: (818) 703-0835
FAX: (818) 703-0517
NORTHWEST REGION
Linear Technology Corporation
782 Sycamore Dr.
Milpitas, CA 95035
Phone: (408) 428-2050
FAX: (408) 432-6331
FRANCE
Linear Technology S.A.R.L.
Immeuble "Le Quartz"
58 Chemin de la Justice
92290 Chatenay Malabry
France
Phone: 33-1-41079555
FAX: 33-1-46314613
GERMANY
Linear Technology GMBH
Untere Hauptstr. 9
D-85386 Eching
Germany
Phone: 49-89-3197410
FAX: 49-89-3194821
JAPAN
Linear Technology KK
5F YZ Bldg.
4-4-12 Iidabashi, Chiyoda-Ku
Tokyo, 102 Japan
Phone: 81-3-3237-7891
FAX: 81-3-3237-8010
TAIWAN
Linear Technology Corporation
Rm. 801, No. 46, Sec. 2
Chung Shan N. Rd.
Taipei, Taiwan, R.O.C.
Phone: 886-2-521-7575
FAX: 886-2-562-2285
UNITED KINGDOM
Linear Technology (UK) Ltd.
The Coliseum, Riverside Way
Camberley, Surrey GU15 3YL
United Kingdom
Phone: 44-276-677676
FAX: 44-276-64851
KOREA
Linear Technology Korea Branch
Namsong Building, #505
Itaewon-Dong 260-199
Yongsan-Ku, Seoul
Korea
Phone: 82-2-792-1617
FAX: 82-2-792-1619
SINGAPORE
Linear Technology Pte. Ltd.
101 Boon Keng Road
#02-15 Kallang Ind. Estates
Singapore 1233
Phone: 65-293-5322
FAX: 65-292-0398
World Headquarters
Linear Technology Corporation
1630 McCarthy Blvd.
Milpitas, CA 95035-7487
Phone: (408) 432-1900
FAX: (408) 434-0507
08/16/93
International Sales Offices
LT/GP 1293 10K REV 0 • PRINTED IN USA