LINER LTC1044A

LTC1044A
12V CMOS
Voltage Converter
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DESCRIPTIO
FEATURES
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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
IS = 1.5µA with 5V Supply When OSC Pin = 0V or V +
High Voltage Upgrade to ICL7660/LTC1044
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APPLICATI
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Conversion of 10V to ±10V Supplies
Conversion of 5V to ±5V Supplies
Precise Voltage Division: VOUT = VIN/2 ±20ppm
Voltage Multiplication: VOUT = ±nVIN
Supply Splitter: VOUT = ±VS/2
Automotive Applications
Battery Systems with 9V Wall Adapters/Chargers
To optimize performance in specific applications, a boost
function is available to raise the internal oscillator frequency 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 +.
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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 functions without using inductors. The input voltage can be
inverted (VOUT = – VIN), doubled (VOUT = 2VIN), divided
(VOUT = VIN/2) or multiplied (VOUT = ±nVIN).
TYPICAL APPLICATI
Output Voltage vs Load Current, V + = 10V
Generating – 10V from 10V
0
LTC1044A
10µF
3
4
CAP+
V+
OSC
GND
LV
CAP–
VOUT
LTC1044A • TA01
8
TA = 25°C
C1 = C2 = 10µF
–1
10V INPUT
7
–2
6
5
–10V OUTPUT
10µF
OUTPUT VOLTAGE (V)
2
+
BOOST
+
1
–3
–4
–5
–6
SLOPE = 45Ω
–7
–8
–9
–10
0
10 20 30 40 50 60 70 80 90 100
LOAD CURRENT (mA)
LTC1044A • TA02
1
LTC1044A
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ABSOLUTE
PACKAGE/ORDER I FOR ATIO
(Note 1)
Supply Voltage ........................................................ 13V
Input Voltage on Pins 1, 6 and 7
(Note 2) .............................. – 0.3V < VIN < 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
TOP VIEW
BOOST 1
8
V+
CAP+ 2
7
OSC
GND 3
6
LV
CAP– 4
5
VOUT
LTC1044ACN8
LTC1044AIN8
N8 PACKAGE
8-LEAD PLASTIC DIP
TJMAX = 110°C, θJA = 100°C/W
ORDER PART
NUMBER
TOP VIEW
BOOST 1
CAP+
8
V+
2
7
OSC
GND 3
6
LV
CAP– 4
5
VOUT
LTC1044ACS8
LTC1044AIS8
S8 PART MARKING
S8 PACKAGE
8-LEAD PLASTIC SOIC
1044A
1044AI
TJMAX = 110°C, θJA = 130°C/W
Consult factory for Military grade parts
ELECTRICAL CHARACTERISTICS
V + = 5V, COSC = 0pF, TA = 25°C, See Test Circuit, unless otherwise noted.
PARAMETER
CONDITIONS
IS
Supply Current
RL = ∞, Pins 1 and 7, No Connection
RL = ∞, Pins 1 and 7, No Connection,
V + = 3V
Minimum Supply Voltage
RL = 10k
●
Maximum Supply Voltage
RL = 10k
●
12
12
V
Output Resistance
IL = 20mA, fOSC = 5kHz
V + = 2V, IL = 3mA, fOSC = 1kHz
●
●
100
120
310
100
130
325
Ω
Ω
Ω
●
●
ROUT
MIN
LTC1044AC
LTC1044AI
TYP
MAX MIN
TYP
MAX
SYMBOL
60
15
200
1.5
60
15
200
UNITS
µA
µA
1.5
V
fOSC
Oscillator Frequency
V + = 5V, (Note 3)
V + = 2V
PEFF
Power Efficiency
RL = 5k, fOSC = 5kHz
95
98
95
98
%
Voltage Conversion Efficiency
RL = ∞
97
99.9
97
99.9
%
Oscillator Sink or Source
Current
VOSC = 0V or V +
Pin 1 (BOOST) = 0V
Pin 1 (BOOST) = V +
The ● denotes specifications which apply over the full operating
temperature range; all other limits and typicals TA = 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
2
●
●
5
1
5
1
3
20
kHz
kHz
3
20
µA
µA
inputs from sources operating from external supplies be applied prior to
power-up of the LTC1044A.
Note 3: 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.
LTC1044A
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TYPICAL PERFOR A CE CHARACTERISTICS
Operating Voltage Range
vs Temperature
Using the Test Circuit
Power Efficiency vs
Oscillator Frequency, V + = 10V
Power Efficiency vs
Oscillator Frequency, V + = 5V
100
14
98
12
100
TA = 25°C
C1 = C2
100µF
98
96
8
6
4
10µF
94
1µF
92
IL = 1mA
90
88
100µF
86
10µF
IL = 15mA
84
2
0
50
100
25
75
AMBIENT TEMPERATURE (°C)
1k
10k
OSCILLATOR FREQUENCY (Hz)
Output Resistance vs
Oscillator Frequency, V + = 5V
400
300
200
C1 = C2 = 1µF
C1 = C2
= 100µF
C1 = C2
= 10µF
100
C1 = C2 = 100µF
1k
10k
OSCILLATOR FREQUENCY (Hz)
0
100
100k
1k
10k
OSCILLATOR FREQUENCY (Hz)
100k
Power Conversion Efficiency
vs Load Current, V + = 5V
100
100
90
90
80
70
60
IS
50
50
40
40
30
30
20
20
10
10
0
0
0
10
10
90
TA = 25°C
C1 = C2 = 10µF
fOSC = 1kHz
PEFF
80
40
30
20
50
LOAD CURRENT (mA)
9
8
70
7
60
6
IS
50
5
40
4
30
3
20
2
10
1
0
0
0
4
3
2
5
LOAD CURRENT (mA)
1
6
7
LTC1044A • TPC06
60
70
LTC1044A • TPC07
300
270
PEFF
240
80
70
210
IS
60
180
50
150
40
120
30
90
20
TA = 25°C
C1 = C2 = 10µF
fOSC = 20kHz
10
0
0
20
80
60
40
100
LOAD CURRENT (mA)
120
SUPPLY CURRENT (mA)
70
60
POWER CONVERSION EFFICIENCY (%)
TA = 25°C
C1 = C2 = 10µF
fOSC = 5kHz
SUPPLY CURRENT (mA)
POWER CONVERSION EFFICIENCY (%)
PEFF
100k
Power Conversion Efficiency
vs Load Current, V + = 10V
100
80
1k
10k
OSCILLATOR FREQUENCY (Hz)
LTC1044A • TPC05
LTC1044A • TPC04
90
1µF
100
POWER CONVERSION EFFICIENCY (%)
OUTPUT RESISTANCE (Ω)
100
0
100
1µF
SUPPLY CURRENT (mA)
200
86
Power Conversion Efficiency
vs Load Current, V + = 2V
TA = 25°C
IL = 10mA
TA = 25°C
IL = 10mA
C1 = C2 = 1µF
88
LTC1044A • TPC03
500
500
300
90
80
100
100k
Output Resistance vs
Oscillator Frequency, V + = 10V
400
100µF
IL = 15mA
10µF
LTC1044A • G02
LTC1044A • TPC01
C1 = C2 = 10µF
10µF
92
82
80
100
125
94
TA = 25°C
C1 = C2
IL = 1mA
84
1µF
82
0
–55 –25
OUTPUT RESISTANCE (Ω)
POWER EFFICIENCY (%)
POWER EFFICIENCY (%)
SUPPLY VOLTAGE (V)
96
10
100µF
60
30
0
140
LTC1044A • TPC08
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LTC1044A
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TYPICAL PERFOR A CE CHARACTERISTICS
Output Resistance
vs Supply Voltage
2.5
TA = 25°C
IL = 3mA
5
TA = 25°C
fOSC = 1kHz
2.0
100
COSC = 0pF
1.0
0.5
0
0
1
2
3
SLOPE = 250Ω
– 0.5
–1.0
1
2
3 4 5 6 7 8
LOAD CURRENT (mA)
–5
10
Oscillator Frequency as a
Function of COSC, V + = 5V
0
–2
–4
SLOPE = 45Ω
320
V + = 2V, fOSC = 1kHz
280
240
200
160
120
V + = 5V, fOSC = 5kHz
80
V + = 10V, fOSC = 20kHz
0
50
25
0
75 100
–55 –25
AMBIENT TEMPERATURE (°C)
10 20 30 40 50 60 70 80 90 100
LOAD CURRENT (mA)
Oscillator Frequency as a
Function of COSC, V + = 10V
100
PIN 1 = V +
PIN 1 = OPEN
100
1000
10000
10
EXTERNAL CAPACITOR (PIN 7 TO GND)(pF)
LTC1044A • TPC14
Oscillator Frequency
vs Temperature
35
100k
TA = 25°C
COSC = 0pF
10k
1k
0.1k
100
1000
10000
10
EXTERNAL CAPACITOR (PIN 7 TO GND)(pF)
10
1
125
COSC = 0pF
OSCILLATOR FREQUENCY (kHz)
V + = 10V
TA = 25°C
100
10
1
PIN 1 = OPEN
Oscillator Frequency
vs Supply Voltage
OSCILLATOR FREQUENCY (Hz)
1k
1k
LTC1044A • TPC13
LTC1044A • TPC12
10k
PIN 1 = V +
10k
40
–8
100k
TA = 25°C
OSCILLATOR FREQUENCY (Hz)
2
100k
C1 = C2 = 10µF
360
OUTPUT RESISTANCE (Ω)
6
4
10 20 30 40 50 60 70 80 90 100
LOAD CURRENT (mA)
LTC1044A • TPC11
400
TA = 25°C
fOSC = 20kHz
0
0
Output Resistance
vs Temperature
10
OUTPUT VOLTAGE (V)
9
LTC1044A • TPC10
Output Voltage
vs Load Current, V + = 10V
–10
–2
–4
0
SLOPE = 80Ω
0
–1
–3
LTC1044A • TPC09
–6
1
–1.5
4 5 6 7 8 9 10 11 12
SUPPLY VOLTAGE (V)
8
2
–2.0
–2.5
10
3
OUTPUT VOLTAGE (V)
COSC = 100pF
TA = 25°C
fOSC = 5kHz
4
1.5
OUTPUT VOLTAGE (V)
OUTPUT RESISTANCE (Ω)
Output Voltage
vs Load Current, V + = 5V
Output Voltage
vs Load Current, V + = 2V
1000
OSCILLATOR FREQUENCY (Hz)
Using the Test Circuit
0
1
2
3
4 5 6 7 8 9 10 11 12
SUPPLY VOLTAGE (V)
30
25
V + = 10V
20
15
10
5
0
–55 –25
V + = 5V
50
100
25
75
0
AMBIENT TEMPERATURE (°C)
125
LTC1044A • G16
LTC1044A • TPC15
4
LTC1044A • TPC17
LTC1044A
TEST CIRCUIT
V + (5V)
IS
1
8
2
C1
10µF
7
LTC1044A
3
4
IL
RL
5
LTC1044A • TC
VOUT
COSC
C2
10µF
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APPLICATI
EXTERNAL
OSCILLATOR
6
+
+
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REQUIV
Theory of Operation
V1
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, 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:
∆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
V2
f
RL
C1
C2
LTC1044A • F01
Figure 1. Switched-Capacitor Building Block
Rewriting in terms of voltage and impedance equivalence,
I = V1 – V2 = V1 – V2
1/(f × C1) REQUIV
A new variable, REQUIV, has been defined such that REQUIV
= 1/(f × C1). Thus, the equivalent circuit for the switchedcapacitor network is as shown in Figure 2.
V2
C2
REQUIV =
1
f × C1
RL
LTC1044A • F02
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 resistance and output voltage ripple, the simple theory although 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 Efficiency 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.
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LTC1044A
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APPLICATI
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V+
(8)
SW1
SW2
C+
(2)
BOOST
φ
7X
(1)
+
C1
÷2
OSC
OSC
(7)
φ
C–
(4)
VOUT
(5)
+
CLOSED WHEN
V + > 3V
LV
(6)
C2
LTC1044A • F03
GND
(3)
Figure 3. LTC1044A Switched-Capacitor Voltage Converter Block Diagram
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
V+
6I
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 1) in conjunction with external 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).
I
V+
BOOST
(1)
NC
1
8
2
C1
~14pF
6I
LV
(6)
SCHMITT
TRIGGER
4
OSC INPUT
6
5
–(V +)
C2
LTC1044A • F05
I
LTC1044A • F04
Figure 5. External Clocking
Figure 4. Oscillator
6
OSC
(7)
3
7
LTC1044A
+
+
100k
REQUIRED FOR
TTL LOGIC
LTC1044A
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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:
REQUIV =
=
1
(fOSC/2) × C1
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 fOSC = 10kHz to 200Ω
at fOSC = 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.
VIN
(1.5V TO 12V)
1
8
2
3
7
LTC1044A
Vd
1N5817
6
4
REQUIRED
FOR V + < 3V
5
Vd
1N5817
+
+
VOUT = 2(VIN – 1)
+
10µF
10µF
LTC1044A • F07
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.
1
= 20Ω
5 × 103 × 10 × 10 –6
Notice that the above equation for REQUIV is not a capacitive reactance equation (XC = 1/ωC) and does not contain
a 2π term.
+
+
C1
10µF
1
8
2
7
3
LTC1044A
4
V + (3V TO 24V)
6
5
LTC1044A • F08
V +/2 ±0.002%
1
8
2
10µF
3
7
LTC1044A
4
6
REQUIRED FOR V + < 3V
5
LTC1044A • F06
VOUT = – V +
+
+
V + (1.5V TO 12V)
TMIN ≤ TA ≤ TMAX
IL ≤ 100nA
+
C2
10µF
REQUIRED FOR
V + < 6V
Figure 8. Ultra-Precision Voltage Divider
10µF
TMIN ≤ TA ≤ TMAX
Figure 6. Negative Voltage Converter
7
LTC1044A
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Battery Splitter
(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.
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 symmetrical ± output voltages, both equal to one half input
voltage. The output voltages are both referenced to pin 3
+
VB
12V
+ C1
1
8
2
7
3
10µF
LTC1044A
4
6
5
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), increasing the capacitor size (C1) or increasing the frequency will
be of more benefit than the paralleling circuit shown.
+VB/2 (6V)
REQUIRED FOR V B < 6V
+VB/2 (–6V)
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 conversion efficiencies and the voltage step-up ratio.
LTC1044A • F09
C2
10µF
+
OUTPUT
COMMON
Figure 9. Battery Splitter
V+
+ C1
1
8
1
2
7
2
3
10µF
LTC1044A
4
+ C1
6
3
10µF
5
8
7
LTC1044A
6
4
5
V OUT = –(V + )
1/4 CD4077
+
*
C2
20µF
LTC1044A • F10
*THE EXCLUSIVE NOR GATE SYNCHRONIZES BOTH LTC1044As TO MINIMIZE RIPPLE
Figure 10. Paralleling for Lower Output Resistance
+
10µF
1
8
2
7
3
4
LTC1044A
FOR V OUT = –3V +
10µF
+
6
5
1
10µF
8
2
3
– (V + )
7
LTC1044A
4
6
5
LTC1044A • F11
+
Figure 11. Stacking for Higher Voltage
8
FOR V OUT = –2V +
V OUT
+
V+
10µF
LTC1044A
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TYPICAL APPLICATIO S
Low Output Impedance Voltage Converter
200k
8.2k
VIN*
7
+
6
LM10
39k
2
VOUT
ADJ
50k
–
8
4
50k
200k
7
8
+
1
6
OUTPUT
5
100µF
+
3
10µF
LTC1044A
LTC1044 • F12
0.1µF
39k
1
2
3
4
10µF
*VIN ≥ –VOUT + 0.5V
LOAD REGULATION ±0.02%, 0mA TO 15mA
+
Single 5V Strain Gauge Bridge Signal Conditioner
+
100µF
1
8
2
7
LTC1044A
3
6
5 –5V
4
220Ω
5V
100µF
+
4
8
0.33µF
3
+
1
1.2V REFERENCE TO
A/D CONVERTER FOR
RATIOMETRIC OPERATION
(1mA MAX)
D
2
100k
10k
LT1004 ZERO
1.2V
TRIM
301k*
350Ω PRESSURE
TRANSDUCER
5
0V
0.047µF
46k*
LT1413
A
E
2k
GAIN
TRIM
–
OUTPUT
0V TO 3.5V
0psi to 350psi
100Ω*
+
7
39k
*1% FILM RESISTOR
PRESSURE TRANSDUCER BLH/DHF-350
(CIRCLED LETTER IS PIN NUMBER)
≈ –1.2V
6
C
–
0.1µF
LTC1044A • F13
9
LTC1044A
U
TYPICAL APPLICATIO S
Regulated Output 3V to 5V Converter
3V
1N914
200Ω
1
8
2
7
LTC1044A
3
+
4
10µF
5V
OUTPUT
+
100µF
6
5
1M
4.8M
7
8
–
1k
1
330k
REF
AMP
+
EVEREADY
EXP-30
LM10
2
–
1k
6
OP
AMP
3
+
4
1N914
100k
150k
LTC1044A • F14
Low Dropout 5V Regulator
2N2219
VOUT = 5V
1N914
200Ω
+
10µF
1
8
2
7
3
LTC1044A
4
12V
+
10µF
6
100Ω
120k
5
100k
SHORT-CIRCUIT
PROTECTION
1M
6V
4 EVEREADY
E-91 CELLS
8
5
FEEDBACK AMP
V+
2
LOAD
+
–
7
LT1013
3
+
–
V–
4
LT1004
1.2V
0.01Ω
1.2k
1
1N914
6
30k
50k
OUTPUT
ADJUST
LTC1044A • F15
10
VDROPOUT AT 1mA = 1mV
VDROPOUT AT 10mA = 15mV
VDROPOUT AT 100mA = 95mV
LTC1044A
U
PACKAGE DESCRIPTIO
Dimensions in inches (millimeters) unless otherwise noted.
N8 Package
8-Lead Plastic DIP
0.400
(10.160)
MAX
8
7
6
5
0.250 ± 0.010
(6.350 ± 0.254)
1
0.300 – 0.320
(7.620 – 8.128)
0.009 – 0.015
(0.229 – 0.381)
(
+0.025
0.325 –0.015
+0.635
8.255
–0.381
)
2
4
3
0.130 ± 0.005
(3.302 ± 0.127)
0.045 – 0.065
(1.143 – 1.651)
0.065
(1.651)
TYP
0.125
(3.175)
MIN
0.045 ± 0.015
(1.143 ± 0.381)
0.018 ± 0.003
(0.457 ± 0.076)
0.100 ± 0.010
(2.540 ± 0.254)
0.020
(0.508)
MIN
N8 0392
S8 Package
8-Lead Plastic SOIC
0.189 – 0.197
(4.801 – 5.004)
8
7
6
5
0.150 – 0.157
(3.810 – 3.988)
0.228 – 0.244
(5.791 – 6.197)
1
0.010 – 0.020
× 45°
(0.254 – 0.508)
0.008 – 0.010
(0.203 – 0.254)
2
3
4
0.053 – 0.069
(1.346 – 1.752)
0.004 – 0.010
(0.101 – 0.254)
0°– 8° TYP
0.016 – 0.050
0.406 – 1.270
0.014 – 0.019
(0.355 – 0.483)
0.050
(1.270)
BSC
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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
SO8 0392
11
LTC1044A
U.S. Area Sales Offices
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
SOUTHEAST REGION
Linear Technology Corporation
17060 Dallas Parkway
Suite 208
Dallas, TX 75248
Phone: (214) 733-3071
FAX: (214) 380-5138
SOUTHWEST REGION
Linear Technology Corporation
22141 Ventura Blvd.
Suite 206
Woodland Hills, CA 91364
Phone: (818) 703-0835
FAX: (818) 703-0517
Linear Technology Corporation
266 Lowell St., Suite B-8
Wilmington, MA 01887
Phone: (508) 658-3881
FAX: (508) 658-2701
CENTRAL REGION
Linear Technology Corporation
Chesapeake Square
229 Mitchell Court, Suite A-25
Addison, IL 60101
Phone: (708) 620-6910
FAX: (708) 620-6977
NORTHWEST REGION
Linear Technology Corporation
782 Sycamore Dr.
Milpitas, CA 95035
Phone: (408) 428-2050
FAX: (408) 432-6331
International Sales Offices
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
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
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
GERMANY
Linear Technology GMBH
Untere Hauptstr. 9
D-85386 Eching
Germany
Phone: 49-89-3197410
FAX: 49-89-3194821
SINGAPORE
Linear Technology Pte. Ltd.
101 Boon Keng Road
#02-15 Kallang Ind. Estates
Singapore 1233
Phone: 65-293-5322
FAX: 65-292-0398
UNITED KINGDOM
Linear Technology (UK) Ltd.
The Coliseum, Riverside Way
Camberley, Surrey GU15 3YL
United Kingdom
Phone: 44-276-677676
FAX: 44-276-64851
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
World Headquarters
Linear Technology Corporation
1630 McCarthy Blvd.
Milpitas, CA 95035-7487
Phone: (408) 432-1900
FAX: (408) 434-0507
08/16/93
12
Linear Technology Corporation
LT/GP 1293 10K REV 0 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7487
(408) 432-1900 ● FAX: (408) 434-0507 ● TELEX: 499-3977
 LINEAR TECHNOLOGY CORPORATION 1993