LTC1044ACN8#TRPBF [Linear]
IC SWITCHED CAPACITOR CONVERTER, Switching Regulator or Controller;
| 型号： | LTC1044ACN8#TRPBF |
| 厂家： | 
Linear |
| 描述： | IC SWITCHED CAPACITOR CONVERTER, Switching Regulator or Controller 光电二极管 |
| 文件： | 总14页 (文件大小：215K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LTC1044A
12V CMOS
Voltage Converter
FeaTures
DescripTion
The LTC®1044A 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. TheLTC1044Aprovidesseveralconversionfunc-
tions without using inductors. The input voltage can be
n
1.5V to 12V Operating Supply Voltage Range
n
13V Absolute Maximum Rating
n
200µA Maximum No Load Supply Current at 5V
n
Boost Pin (Pin 1) for Higher Switching Frequency
n
97% Minimum Open Circuit Voltage Conversion
Efficiency
inverted (V
= –V ), doubled (V
= 2V ), divided
OUT IN
OUT
IN
OUT IN
= nV ).
n
95% Minimum Power Conversion Efficiency
(V
= V /2) or multiplied (V
OUT
IN
+
n
I = 1.5µA with 5V Supply When OSC Pin = 0V or V
S
To optimize performance in specific applications, a boost
functionisavailabletoraisetheinternaloscillatorfrequency
by a factor of seven. 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
n
High Voltage Upgrade to ICL7660/LTC1044
applicaTions
n
Conversion of 10V to 10V Supplies
n
Conversion of 5V to 5V Supplies
+
OSC pin is tied to GND or V .
n
Precise Voltage Division: V
= V /2 20ppm
OUT
IN
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
n
n
n
n
Technology Corporation. All other trademarks are the property of their respective owners.
Voltage Multiplication: V
= nV
OUT
IN
Supply Splitter: V
= V /2
OUT
S
Automotive Applications
Battery Systems with 9V Wall Adapters/Chargers
Typical applicaTion
Generating –10V from 10V
Output Voltage vs Load Current, V+ = 10V
0
LTC1044A
T
= 25°C
A
–1
–2
–3
–4
–5
–6
–7
–8
–9
–10
1
2
3
4
8
7
6
5
+
C1 = C2 = 10µF
10V INPUT
BOOST
V
+
CAP
OSC
LV
+
GND
10µF
–
–10V OUTPUT
CAP
V
OUT
1044a TA01a
10µF
+
SLOPE = 45Ω
0
10 20 30 40 50 60 70 80 90 100
LOAD CURRENT (mA)
1044a TA01b
1044afa
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For more information www.linear.com/LTC1044A
LTC1044A
absoluTe MaxiMuM raTings
(Note 1)
Supply Voltage..........................................................13V
Operating Temperature Range
Input Voltage on Pins 1, 6 and 7
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
+
(Note 2)..................................–0.3V < V < V + 0.3V
IN
Current into Pin 6....................................................20µA
Output Short-Circuit Duration
+
V ≤ 6.5V ......................................................Continuous
pin conFiguraTion
TOP VIEW
+
TOP VIEW
+
BOOST
1
2
3
4
V
BOOST
1
2
3
4
8
7
6
5
V
8
7
6
5
+
+
CAP
OSC
LV
CAP
OSC
LV
GND
GND
–
–
CAP
V
CAP
V
OUT
OUT
N8 PACKAGE
8-LEAD PLASTIC DIP
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 110°C, θ = 100°C/W
T
= 110°C, θ = 130°C/W
JMAX JA
JA
Consult factory for military grade parts
orDer inForMaTion
LEAD FREE FINISH
LTC1044ACN8#PBF
LTC1044AIN8#PBF
LTC1044ACS8#PBF
LTC1044AIS8#PBF
TAPE AND REEL
PART MARKING
LTC1044 ACN8
LTC1044 AIN8
1044A
PACKAGE DESCRIPTION
8-Lead Plastic DIP
8-Lead Plastic DIP
8-Lead Plastic SO
8-Lead Plastic SO
TEMPERATURE RANGE
0°C to 70°C
LTC1044ACN8#TRPBF
LTC1044AIN8#TRPBF
LTC1044ACS8#TRPBF
LTC1044AIS8#TRPBF
–40°C to 85°C
0°C to 70°C
1044AI
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on nonstandard lead based finish parts.
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/
1044afa
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LTC1044A
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.
LTC1044AC
LTC1044AI
TYP MAX UNITS
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
I
Supply Current
R = ∞, Pins 1 and 7, No Connection
60
15
200
60
15
200
μA
μA
S
L
R = ∞, Pins 1 and 7, No Connection,
L
+
V = 3V
l
l
Minimum Supply Voltage
Maximum Supply Voltage
Output Resistance
R = 10k
1.5
1.5
V
V
L
R = 10k
L
12
12
R
OUT
I = 20mA, f
L
= 5kHz
100
120
310
100
130
325
Ω
Ω
Ω
OSC
l
l
+
V = 2V, I = 3mA, f
= 1kHz
L
OSC
+
l
l
f
Oscillator Frequency
Power Efficiency
V = 5V, (Note 3)
5
1
5
1
kHz
kHz
OSC
+
V = 2V
P
RL = 5k, f
= 5kHz
95
97
98
95
97
98
%
%
EFF
OSC
Voltage Conversion Efficiency RL = ∞
99.9
99.9
+
Oscillator Sink or Source
Current
V
= 0V or V
OSC
l
l
Pin 1 (BOOST) = 0V
Pin 1 (BOOST) = V
3
20
3
20
µA
µA
+
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 latchup. It is recommended that no
inputs from sources operating from external supplies be applied prior to
power-up of the LTC1044A.
Note 3: f
is tested with C
= 100pF to minimize the effects of test
OSC
OSC
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.
+
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LTC1044A
Typical perForMance characTerisTics
Operating Voltage Range vs
Temperature
Power Efficiency vs Oscillator
Frequency, V+ = 5V
Power Efficiency vs Oscillator
Frequency, V+ = 10V
100
98
14
12
100
98
T
= 25°C
T
= 25°C
A
A
C1 = C2
C1 = C2
100µF
10µF
100µF
I
L
= 1mA
96
96
10µF
10
8
94
94
100µF
= 15mA
1µF
I
= 1mA
L
10µF
I
L
92
90
92
90
6
88
86
84
82
80
88
86
84
82
80
100µF
10µF
I
= 15mA
4
L
1µF
2
1µF
1k
1µF
0
–55 –25
0
25
50
75
100 125
100
10k
100k
100
1k
10k
100k
AMBIENT TEMPERATURE (°C)
OSCILLATOR FREQUENCY (Hz)
OSCILLATOR FREQUENCY (Hz)
1044a G02
1044a G03
1044a G01
Output Resistance vs Oscillator
Frequency, V+ = 5V
Output Resistance vs Oscillator
Frequency, V+ = 10V
Power Conversion Efficiency vs
Load Current, V+ = 2V
100
90
80
70
60
50
40
30
20
10
0
10
500
400
300
200
100
0
500
400
300
200
100
0
T
= 25°C
T
L
= 25°C
= 10mA
T = 25°C
A
I = 10mA
L
A
A
9
8
7
6
5
4
3
2
1
0
C1 = C2 = 10µF
= 1kHz
I
P
C1 = C2 = 10µF
EFF
f
OSC
C1 = C2 = 1µF
I
S
C1 = C2 = 1µF
C1 = C2
= 100µF
C1 = C2
= 10µF
C1 = C2 = 100µF
1k
0
2
3
4
5
6
7
1
100
10k
100k
100
1k
10k
100k
LOAD CURRENT (mA)
OSCILLATOR FREQUENCY (Hz)
OSCILLATOR FREQUENCY (Hz)
1044a G04
1044a G05
1044a G06
Power Conversion Efficiency vs
Load Current, V+ = 5V
Power Conversion Efficiency vs
Load Current, V+ = 10V
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
300
T
= 25°C
A
270
240
210
180
150
120
90
C1 = C2 = 10µF
= 5kHz
P
EFF
P
EFF
f
OSC
I
S
I
S
60
T
= 25°C
A
C1 = C2 = 10µF
= 20kHz
30
f
OSC
0
0
20
30
40
50
60
70
0
40
60
80
100 120 140
10
20
LOAD CURRENT (mA)
LOAD CURRENT (mA)
1044a G07
1044a G08
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LTC1044A
Typical perForMance characTerisTics
Output Resistance vs Supply
Voltage
Output Voltage vs Load Current,
V+ = 2V
Output Voltage vs Load Current,
V+ = 5V
1000
100
10
2.5
2.0
5
4
T
f
= 25°C
OSC
T
f
= 25°C
A
OSC
T
I
= 25°C
= 3mA
A
A
L
= 1kHz
= 5kHz
1.5
3
1.0
2
C
OSC
= 100pF
0.5
1
SLOPE = 80Ω
0
0
SLOPE = 250Ω
–0.5
–1.0
–1.5
–2.0
–2.5
–1
–2
–3
–4
–5
C
OSC
= 0pF
0
1
2
3
4
5
6
7
8
9
10
0
10 20 30 40 50 60 70 80 90 100
1
2
4
6
7
8
10 11 12
9
0
3
5
LOAD CURRENT (mA)
LOAD CURRENT (mA)
SUPPLY VOLTAGE (V)
1044a G09
1044a G10
1044a G11
Output Voltage vs Load Current,
V+ = 10V
Output Resistance vs
Temperature
Oscillator Frequency as a
Function of COSC, V+ = 5V
10
8
100k
10k
1k
400
360
320
280
240
200
160
120
80
T
= 25°C
C1 = C2 = 10µF
= 1kHz
T
OSC
= 25°C
A
A
f
= 20kHz
+
6
PIN 1 = V
+
V
= 2V, f
OSC
4
2
0
–2
–4
–6
–8
PIN 1 = OPEN
+
V
+
= 5V, f
= 5kHz
OSC
100
10
SLOPE = 45Ω
40
V
= 10V, f
25
= 20kHz
OSC
50
–10
0
0
10 20 30 40 50 60 70 80 90 100
1
10
100
1000
10000
–55
0
75 100 125
–25
EXTERNAL CAPACITOR (PIN 7 TO GND)(pF)
LOAD CURRENT (mA)
AMBIENT TEMPERATURE (°C)
1044a G14
1044a G12
1044a G13
Oscillator Frequency as a
Function of COSC, V+ = 10V
Oscillator Frequency vs Supply
Voltage
Oscillator Frequency vs
Temperature
100k
10k
1k
100k
10k
35
30
+
V
T
= 10V
T = 25°C
A
C
= 0pF
OSC
= 25°C
C
= 0pF
OSC
A
+
PIN 1 = V
25
20
15
10
5
+
V
= 10V
PIN 1 = OPEN
1k
100
10
+
V
= 5V
25
0.1k
0
50
100 125
1
10
100
1000
10000
0
1
2
3
4
5
6
7
8
9
10 11 12
–55 –25
0
75
EXTERNAL CAPACITOR (PIN 7 TO GND)(pF)
SUPPLY VOLTAGE (V)
AMBIENT TEMPERATURE (°C)
1044a G16
1044a G15
1044a G17
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LTC1044A
TesT circuiT
+
V
R
(5V)
I
I
S
L
1
2
3
4
8
7
6
5
EXTERNAL
OSCILLATOR
LTC1044A
+
L
C1
10µF
V
OUT
C2
C
OSC
+
10µF
1044a TC
applicaTions inForMaTion
Theory of Operation
A new variable, R
, has been defined such that R
EQUIV EQUIV
= 1/(f • C1). Thus, the equivalent circuit for the switched-
To understand the theory of operation of the LTC1044A,
a review of a basic switched-capacitor building block is
helpful.
capacitor network is as shown in Figure 2.
R
EQUIV
V1
V2
In Figure 1, when the switch is in the left position, capaci-
tor 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:
R
C2
L
1
R
=
EQUIV
f × C1
1044a 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.
∆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)
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
efficiencywilldrop.ThetypicalcurvesforPowerEfficiency
vsFrequencyshowthiseffectforvariouscapacitorvalues.
V1
V2
f
R
L
C1
C2
1044a F01
Figure 1. Switched-Capacitor Building Block
Rewriting in terms of voltage and impedance equivalence,
V1– V2 V1– V2
Note also that power efficiency decreases as frequency
goes up. This is caused by internal switching losses which
occurduetosomefinitechargebeinglostoneachswitching
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=
=
1
R
EQUIV
(f•C1)
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LTC1044A
applicaTions inForMaTion
+
V
(8)
SW1
SW2
+
C
(2)
BOOST
φ
+
7X
(1)
C1
OSC
÷ 2
φ
–
OSC
(7)
C
V
OUT
(5)
(4)
C2
+
1044a F03
CLOSED WHEN
+
V
> 3V
LV
(6)
GND
(3)
Figure 3. LTC1044A Switched-Capacitor Voltage Converter Block Diagram
LV (Pin 6)
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.
+
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
Driving the LTC1044A from an external frequency source
canbeeasilyachievedbydrivingpin7andleavingtheboost
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).
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.
+
V
6I
I
BOOST
(1)
+
V
100k
REQUIRED FOR
TTL LOGIC
1
2
3
4
8
7
6
5
NC
SCHMITT
TRIGGER
OSC INPUT
OSC
(7)
LTC1044A
+
C1
~14pF
+
–(V )
6I
I
C2
+
LV
(6)
1044a F04
1044a F05
Figure 4. Oscillator
+
Figure 5. External Clocking
By connecting the boost pin (pin 1) to V , the charge and
discharge current is increased and hence, the frequency
is increased by approximately seven times. Increasing the
frequency will decrease output impedance and ripple for
higher load currents.
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LTC1044A
applicaTions inForMaTion
Capacitor Selection
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,
External capacitors C1 and C2 are not critical. Matching is
not required, nor do they have to be high quality or tight
tolerance.Aluminumortantalumelectrolyticsareexcellent
choices with cost and size being the only consideration.
the output impedance goes from 60Ω at f
= 10kHz to
OSC
200Ω at f
= 1kHz. As the 1/(f • C) term becomes large
OSC
compared to the switch-on resistance term, the output
Negative Voltage Converter
resistance is determined by 1/(f • C) only.
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
Voltage Doubling
Figure 7 shows a two-diode capacitive voltage doubler.
Witha5Vinput,theoutputis9.93Vwithnoloadand9.13V
with a 10mA load. With a 10V input, the output is 19.93V
with no load and 19.28V with a 10mA load.
+
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.
V
IN
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:
(1.5V TO 12V)
1
2
3
4
8
7
6
5
+
V
d
V
d
1N5817
LTC1044A
1N5817
+
V
OUT
= 2(V – 1)
IN
REQUIRED
+
FOR V < 3V
+
+
1. The equivalent switched-capacitor resistance (see
Theory of Operation).
10µF
10µF
1044a F07
2. A term related to the on-resistance of the MOS
switches.
Figure 7. Voltage Doubler
At an oscillator frequency of 10kHz and C1 = 10µF, the
first term is:
Ultra-Precision Voltage Divider
An ultra-precision voltage divider is shown in Figure 8. To
achieve the 0.002% accuracy indicated, the load current
should be kept below 100nA. However, with a slight loss
in accuracy the load current can be increased.
1
R
=
=
EQUIV
(f
1
/2)•C1
OSC
=20Ω
– 6
3
5•10 •10•10
1
2
3
4
8
7
6
5
+
V
(3V TO 24V)
Notice that the above equation for R
is not a capaci-
EQUIV
tive reactance equation (X = 1/C) and does not contain
C
LTC1044A
+
C1
10µF
a 2π term.
1
2
3
4
8
7
6
5
+
V
(1.5V TO 12V)
+
V /2 0.002%
1044a F08
REQUIRED FOR
+
+
C2
10µF
LTC1044A
V
< 6V
+
T
I
≤ T ≤ T
MIN A MAX
+
10µF
≤ 100nA
REQUIRED FOR V < 3V
+
L
V
= –V
OUT
10µF
+
Figure 8. Ultra-Precision Voltage Divider
T
≤ T ≤ T
A MAX
1044a F06
MIN
Figure 6. Negative Voltage Converter
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LTC1044A
applicaTions inForMaTion
Battery Splitter
Paralleling for Lower Output Resistance
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.
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,
theoutputresistanceisdominatedby1/(f• C1),increasing
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 pro-
vide 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
bytheswitch. Theavailableoutputcurrentwillbedictated/
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
+V /2 (6V)
B
+
V
B
LTC1044A
+
12V
C1
10µF
REQUIRED FOR V < 6V
B
+V /2 (–6V)
B
C2
+
10µF
OUTPUT
COMMON
1044a F09
Figure 9. Battery Splitter
+
V
1
2
8
7
6
5
1
2
3
4
8
7
6
5
+
LTC1044A
+
LTC1044A
3
4
C1
C1
10µF
10µF
+
V
= –(V )
OUT
1/4 CD4077
*
C2
+
20µF
*THE EXCLUSIVE NOR GATE SYNCHRONIZES BOTH LTC1044As TO MINIMIZE RIPPLE
1044a F10
Figure 10. Paralleling for Lower Output Resistance
+
V
+
+
FOR V
= –3V
FOR V
= –2V
OUT
OUT
1
2
3
4
8
7
6
5
1
2
8
7
6
5
10µF
+
+
LTC1044A
LTC1044A
3
4
10µF
+
–(V )
V
OUT
10µF
10µF
+
+
1044a F11
Figure 11. Stacking for Higher Voltage
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9
For more information www.linear.com/LTC1044A
LTC1044A
Typical applicaTions
Low Output Impedance Voltage Converter
200k
8.2k
V
*
IN
V
OUT
3
2
7
50k
+
ADJ
6
LM10
OUTPUT
10µF
8
1
7
6
5
4
39k
+
1
–
100µF
+
8
4
50k
LTC1044A
200k
39k
1044a F12
0.1µF
2
3
10µF
+
*V ≥ |–V | + 0.5V
LOAD REGULATION 0.02%, 0mA TO 15mA
IN
OUT
Single 5V Strain Gauge Bridge Signal Conditioner
1
2
3
4
8
7
6
5
5V
LTC1044A
+
100µF
100µF
–5V
4
+
220Ω
8
0.33µF
3
2
+
OUTPUT
0V TO 3.5V
0psi to 350psi
1
1.2V REFERENCE TO
A/D CONVERTER FOR
RATIOMETRIC OPERATION
(1mA MAX)
D
2k
GAIN
TRIM
–
100k
0.047µF
46k*
LT1413
10k
ZERO
TRIM
301k*
A
LT1004
1.2V
350Ω PRESSURE
TRANSDUCER
100Ω*
E
5
6
0V
+
–
7
39k
*1% FILM RESISTOR
PRESSURE TRANSDUCER BLH/DHF-350
(CIRCLED LETTER IS PIN NUMBER)
C
≈ –1.2V
0.1µF
1044a F13
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For more information www.linear.com/LTC1044A
LTC1044A
Typical applicaTions
Regulated Output 3V to 5V Converter
3V
1N914
200Ω
1
2
3
4
8
7
6
5
5V
OUTPUT
+
100µF
LTC1044A
1M
1
+
4.8M
10µF
7
–
+
8
1k
REF
AMP
330k
EVEREADY
EXP-30
LM10
–
+
2
3
1k
6
OP
AMP
4
100k
1N914
150k
1044a F14
Low Dropout 5V Regulator
2N2219
V
= 5V
OUT
1N914
200Ω
10µF
1
8
7
6
5
12V
2
3
4
+
LTC1044A
+
10µF
100Ω
120k
100k
SHORT-CIRCUIT
PROTECTION
8
+
5
FEEDBACK AMP
1M
6V
V
LOAD
4 EVEREADY
E-91 CELLS
2
3
+
–
–
+
7
LT1013
1N914
–
V
4
1
6
LT1004
1.2V
30k
50k
OUTPUT
ADJUST
1.2k
V
V
V
AT 1mA = 1mV
AT 10mA = 15mV
AT 100mA = 95mV
DROPOUT
DROPOUT
DROPOUT
0.01Ω
1044a F15
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11
For more information www.linear.com/LTC1044A
LTC1044A
package DescripTion
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
N Package
8-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510 Rev I)
.400*
(10.160)
MAX
.130 ±.005
(3.302 ±0.127)
.300 – .325
(7.620 – 8.255)
.045 – .065
(1.143 – 1.651)
8
1
7
6
3
5
4
.065
(1.651)
TYP
.255 ±.015*
(6.477 ±0.381)
.008 – .015
(0.203 – 0.381)
.120
(3.048)
MIN
.020
(0.508)
MIN
+.035
–.015
.325
2
.018 ±.003
(0.457 ±0.076)
.100
(2.54)
BSC
+0.889
8.255
N8 REV I 0711
(
)
–0.381
NOTE:
INCHES
1. DIMENSIONS ARE
MILLIMETERS
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
S8 Package
8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610 Rev G)
.189 – .197
(4.801 – 5.004)
.045 ±.005
NOTE 3
.050 BSC
7
5
8
6
.245
MIN
.160 ±.005
.150 – .157
(3.810 – 3.988)
NOTE 3
.228 – .244
(5.791 – 6.197)
.030 ±.005
TYP
1
3
4
2
RECOMMENDED SOLDER PAD LAYOUT
.010 – .020
(0.254 – 0.508)
× 45°
.053 – .069
(1.346 – 1.752)
.004 – .010
(0.101 – 0.254)
.008 – .010
(0.203 – 0.254)
0°– 8° TYP
.016 – .050
(0.406 – 1.270)
.050
(1.270)
BSC
.014 – .019
(0.355 – 0.483)
TYP
NOTE:
INCHES
1. DIMENSIONS IN
(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
SO8 REV G 0212
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For more information www.linear.com/LTC1044A
LTC1044A
revision hisTory
REV
DATE
DESCRIPTION
PAGE NUMBER
A
4/14
Changed 0.0002% to 0.002% in the Ultra-Precision Voltage Divider section
8
1044afa
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 representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
13
LTC1044A
Typical applicaTion
Two-Diode Capacitive Voltage Doubler
V
IN
(1.5V TO 12V)
1
2
3
4
8
7
6
5
+
V
d
V
d
1N5817
LTC1044A
1N5817
+
V
= 2(V – 1)
IN
OUT
REQUIRED
FOR V < 3V
+
+
+
10µF
10µF
1044a TA02
relaTeD parTs
PART NUMBER
DESCRIPTION
COMMENTS
V : 1.8V to 5.5V, V
LTC3240-3.3/
LTC3240-2.5
3.3V/2.5V Step-Up/Step-Down Charge Pump
DC/DC Converter
= 3.3V/2.5V, I = 65μA, I < 1μA,
OUT(MAX) Q SD
IN
(2mm × 2mm) DFN Package
LTC3245
Wide V Range Low Noise 250mA Buck-Boost V : 2.7V to 38V, V
= 5V, I = 20µA, I = 4µA, 12-Lead MS and
IN
IN
OUT(MAX) Q SD
Charge Pump
(3mm × 4mm) DFN Packages
LTC3255
Wide V Range 50mA Buck (Step-Down)
V : 4V to 48V, V = 12.5V, I = 16µA, 10-Lead MSOP and
IN
IN
OUT(MAX)
Q
Charge Pump
(3mm × 3mm) DFN Packages
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LT 0414 REV A • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
14
(408)432-1900 FAX: (408) 434-0507 www.linear.com/LTC1044A
●
●
LINEAR TECHNOLOGY CORPORATION 1993
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