LTC660CS8#PBF [Linear]
LTC660 - 100mA CMOS Voltage Converter; Package: SO; Pins: 8; Temperature Range: 0°C to 70°C;
| 型号： | LTC660CS8#PBF |
| 厂家： | 
Linear |
| 描述： | LTC660 - 100mA CMOS Voltage Converter; Package: SO; Pins: 8; Temperature Range: 0°C to 70°C 转换器 |
| 文件： | 总12页 (文件大小：265K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LTC660
100mA CMOS
Voltage Converter
U
FEATURES
DESCRIPTION
The LTC®660 is a monolithic CMOS switched-capacitor
voltage converter. It performs supply voltage conversion
from positive to negative from an input range of 1.5V to
5.5V, resulting in complementary output voltages of
–1.5V to –5.5V. It also performs a doubling at an input
voltage range of 2.5V to 5.5V, resulting in a doubled
output voltage of 5V to 11V. Only two external capacitors
are needed for the charge pump and charge reservoir
functions.
■
Simple Conversion of 5V to –5V Supply
■
Output Drive: 100mA
■
ROUT: 6.5Ω (0.65V Loss at 100mA)
■
■
■
BOOST Pin (Pin 1) for Higher Switching Frequency
Inverting and Doubling Modes
Minimum Open Circuit Voltage Conversion
Efficiency: 99%
■
■
Typical Power Conversion Efficiency
with a 100mA Load: 88%
Easy to Use
The converter has an internal oscillator that can be
overdriven by an external clock or slowed down when
connected to a capacitor. The oscillator runs at a 10kHz
frequency when unloaded. A higher frequency outside the
audio band can also be obtained if the BOOST pin is tied
to V+.
U
APPLICATIONS
■
Conversion of 5V to ±5V Supplies
■
Inexpensive Negative Supplies
■
Data Acquisition Systems
High Current Upgrade to LTC1044 or LTC7660
■
TheLTC660containsaninternaloscillator, divide-by-two,
voltage level shifter and four power MOSFETs.
, LTC and LT are registered trademarks of Linear Technology Corporation.
U
TYPICAL APPLICATION
Output Voltage vs
Generating –5V from 5V
Load Current for V+ = 5V
–5.0
1
2
3
4
8
7
6
5
+
5V INPUT
BOOST
V
T
= 25°C
OUT
A
R
= 6.5Ω
+
CAP
OSC
LV
–4.8
–4.6
–4.4
–4.2
–4.0
+
LTC660
C1
150µF
GND
–
–5V
OUTPUT
CAP
V
OUT
C2
150µF
+
660 TA01
0
20
40
60
80
100
LOAD CURRENT (mA)
660 TA02
1
LTC660
W W
U W
U
W U
ABSOLUTE MAXIMUM RATINGS
PACKAGE/ORDER INFORMATION
(Note 1)
ORDER PART
TOP VIEW
Supply Voltage (V+).................................................. 6V
Input Voltage on Pins 1, 6, 7
NUMBER
+
BOOST
V
1
2
3
4
8
7
6
5
+
(Note 2) ............................ –0.3V < VIN < (V+ + 0.3V)
Output Short-Circuit Duration to GND
CAP
OSC
LV
LTC660CN8
LTC660CS8
GND
–
CAP
V
OUT
(Note 5) ............................................................. 1 sec
Power Dissipation.............................................. 500mW
Operating Temperature Range .................... 0°C to 70°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
N8 PACKAGE
8-LEAD PLASTIC DIP
S8 PART MARKING
660
S8 PACKAGE
8-LEAD PLASTIC SOIC
TJMAX = 100°C, θJA = 100°C/W (N)
TJMAX = 100°C, θJA = 150°C/W (S)
Consult Factory for Industrial and Military grade parts.
ELECTRICAL CHARACTERISTICS
V+ = 5V, C1 and C2 = 150µF, Boost = Open, COSC = 0pF, TA = 25°C, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Supply Voltage
R = 1k
L
Inverter, LV = Open
Inverter, LV = GND
●
●
●
3
1.5
2.5
5.5
5.5
5.5
V
V
V
Doubler, LV = V
OUT
I
I
Supply Current
No Load
Boost = Open
Boost = V
●
●
0.08
0.23
0.5
3
mA
mA
S
+
Output Current
V
More Negative Than –4V
OUT
●
●
100
mA
OUT
R
Output Resistance
Oscillator Frequency
I = 100mA (Note 3)
L
6.5
10
Ω
OUT
f
Boost = Open
Boost = V (Note 4)
10
80
kHz
kHz
OSC
+
+
Power Efficiency
R = 1k Connected Between V and V
●
●
96
92
98
96
88
%
%
%
L
OUT
R = 500Ω Connected Between V
and GND
L
OUT
I = 100mA to GND
L
Voltage Conversion Efficiency
No Load
99
99.96
%
Oscillator Sink or Source Current Boost = Open
±1.1
±5.0
µA
µA
+
Boost = V
The
●
denotes specifications which apply over the full operating
Note 4: f
is tested with C
= 100pF to minimize the effects of test
OSC
OSC
temperature range; all other limits and typicals are at T = 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 source operating from external supplies be applied prior to
power-up of the LTC660.
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.
A
+
Note 5: OUT may be shorted to GND for 1 sec without damage, but
+
shorting OUT to V may damage the device and should be avoided. Also,
+
for temperatures above 85°C, OUT must not be shorted to GND or V ,
even instantaneously, or device damage may result.
Note 3: The output resistance is a combination of internal switch
resistance and external capacitor ESR. To maximize output voltage and
efficiency, keep external capacitor ESR < 0.2Ω.
2
LTC660
W
U
(Using Test Circuit in Figure 1)
TYPICAL PERFORMANCE CHARACTERISTICS
Output Resistance
Supply Current
vs Oscillator Frequency
Supply Current vs Supply Voltage
vs Oscillator Frequency
100
90
1000
100
10
300
250
200
150
100
50
T
V
= 25°C
= 5V
T
V
= 25°C
= 5V
T
A
= 25°C
A
A
+
+
BOOST = OPEN
80
70
60
50
C1 = C2 = 150µF
C1 = C2 = 1500µF
+
BOOST = V
40
30
20
10
0
C1 = C2 = 22µF
BOOST = OPEN
1
0
4
4.5
0.01
0.1
1
10
100
1000
0.1
1
10
100
1.5
2
2.5
3
3.5
5
5.5
SUPPLY VOLTAGE (V)
OSCILLATOR FREQUENCY (kHz)
OSCILLATOR FREQUENCY (kHz)
LTC660 • G02
LTC660 • TPC03
LTC660 • G01
Output Voltage and Efficiency
vs Load Current, V+ = 5V
Output Resistance
vs Supply Voltage
Output Resistance vs Temperature
–3.0
–3.4
–3.8
–4.2
–4.6
–5.0
100
96
25
20
15
18
16
14
12
10
8
T
= 25°C
BOOST = OPEN
T = 25°C
A
BOOST = OPEN
A
BOOST = OPEN
LTC660
EFFICIENCY
92
88
+
V
= 1.5V
84
80
+
V
= 3V
V
10
5
76
72
6
LTC660
OUTPUT VOLTAGE
+
= 5V
4
68
64
2
0
60
0
–60 –40 –20
0
20 40 60 80 100 120 140
0
10 20 30 40 50 60 70 80 90 100
LOAD CURRENT (mA)
0
1
2
3
4
5
6
TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
LTC660 • TPC05
LTC660 • TPC06
LTC690 • TPC04
Output Voltage Drop
vs Load Current
1.0
Efficiency vs Load Current
Efficiency vs Load Current
100
95
90
85
80
75
70
65
60
100
T
= 25°C
T
= 25°C
T
A
= 25°C
A
A
+
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
BOOST = OPEN
+
BOOST = V
+
BOOST = OPEN
95
90
85
80
75
70
65
60
V
= 5.5V
V
= 5.5V
+
V
= 2.5V
+
+
+
V = 1.5V
V
V
= 4.5V
= 3.5V
+
V
= 4.5V
+
V
= 3.5V
+
+
V
V
= 3.5V
= 4.5V
+
V
= 2.5V
+
V
= 5.5V
+
+
+
V
= 1.5V
V
= 1.5V
V = 2.5V
0
10 20 30 40 50 60 70 80 90 100
LOAD CURRENT (mA)
0
10 20 30 40 50 60 70 80 90 100
LOAD CURRENT (mA)
0
10 20 30 40 50 60 70 80 90 100
LOAD CURRENT (mA)
LTC660 • TPC07
LTC660 • TPC09
LTC660 • TPC08
3
LTC660
TYPICAL PERFORMANCE CHARACTERISTICS (Using Test Circuit in Figure 1)
W
U
Output Voltage Drop
vs Load Current
Output Voltage
Efficiency vs Oscillator Frequency
vs Oscillator Frequency
100
95
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
–5.0
–4.5
–4.0
–3.5
–3.0
–2.5
T
= 25°C
A
I
L
= 1mA
+
BOOST = V
90
I
= 10mA
85
L
I
= 10mA
I = 80mA
L
L
+
+
V
V
= 2.5V
= 5.5V
80
75
I
= 1mA
L
I
= 80mA
L
+
V
= 1.5V
70
65
60
55
50
+
+
V
V
= 3.5V
= 4.5V
T
=25°C
= 5V
T
V
= 25°C
= 5V
A
V
A
+
+
BOOST = OPEN
BOOST = OPEN
0.1
1
10
100
0
10 20 30 40 50 60 70 80 90 100
LOAD CURRENT (mA)
0.1
1
10 100
OSCILLATOR FREQUENCY (kHz)
OSCILLATOR FREQUENCY (kHz)
LTC660 • TPC12
LTC660 • TPC10
LTC660 • TPC11
Oscillator Frequency
vs Supply Voltage
Oscillator Frequency
Oscillator Frequency
vs Supply Voltage
vs Temperature
100
90
80
70
60
50
40
30
20
10
0
12
10
12
10
T
= 25°C
T
A
= 25°C
A
+
BOOST = V
OSC = OPEN
BOOST = OPEN
OSC = OPEN
8
6
8
6
4
2
0
4
2
0
+
V
= 5V
BOOST = OPEN
OSC = OPEN
–60 –40 –20
0
20 40 60 80 100 120 140
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
LTC660 • TPC15
LTC660 • TPC13
LTC660 • TPC14
Oscillator Frequency
Oscillator Frequency
vs Temperature
100
vs External Capacitance
100
10
90
80
70
60
50
40
30
+
BOOST = V
1
BOOST = OPEN
0.1
00.1
+
20
10
0
V
= 5V
BOOST = V
OSC = OPEN
+
–60 –40 –20
0
20 40 60 80 100 120 140
1
10
100
1000
10000
CAPACITANCE (pF)
TEMPERATURE (°C)
LTC660 • TPC17
LTC660 • TPC16
4
LTC660
U
U
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PIN FUNCTIONS
PIN
NAME
INVERTER
DOUBLER
1
BOOST
Internal Oscillator Frequency Control Pin.
Same
BOOST = Open, f
= 10kHz typ;
= 80kHz typ; when OSC is driven
OSC
+
BOOST = V , f
OSC
externally BOOST has no effect.
+
2
3
4
5
6
CAP
Positive Terminal for Charge Pump Capacitor
Power Supply Ground Input
Same
GND
Positive Voltage Input
Same
–
CAP
Negative Terminal for Charge Pump Capacitor
Negative Voltage Output
V
Power Supply Ground Input
OUT
LV
Tie LV to GND when the input voltage is less than 3V.
LV may be connected to GND or left open for input
voltages above 3V. Connect LV to GND when
overdriving OSC.
LV must be tied to V
for all input voltages.
OUT
7
8
OSC
An external capacitor can be connected to this pin to
slow the oscillator frequency. Keep stray capacitance
to a minimum. An external oscillator can be applied
to this pin to overdrive the internal oscillator.
Same except standard logic levels will not be able to
overdrive OSC pin.
+
V
Positive Voltage Input
Positive Voltage Output
TEST CIRCUIT
I
+
S
1
2
3
8
7
6
+
V
V
5V
EXTERNAL
OSCILLATOR
+
LTC660
C1
150µF
C
OSC
4
5
R
L
I
L
V
OUT
C1
+
LTC660 • F01
150µF
Figure 1. Test Circuit
5
LTC660
U
W U U
APPLICATIONS INFORMATION
+
Theory of Operation
V
(8)
SW1
SW2
To understand the theory of operation for the LTC660, 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 discharging 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:
+
–
CAP
(2)
BOOST
φ
φ
4.5×
(1)
+
C1
OSC
+2
OSC
(7)
V
OUT
(5)
CAP
(4)
C2
+
LV
(6)
GND
(3)
CLOSED WHEN
LTC660 • F04
+
V
> 3.0V
∆q = q1 – q2 = C1 (V1 – V2)
Figure 4. LTC660 Switched-Capacitor Voltage Converter
Block Diagram
If the switch is cycled “f” times per second, the charge
transfer per unit time (i.e., current) is:
Thissimplifiedcircuitdoesnotincludefiniteon-resistance
of the switches and output voltage ripple, however, it does
give an intuitive feel for how the device works. For ex-
ample, if you examine power conversion efficiency as a
function of frequency this simple theory will explain how
the LTC660 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 voltage losses will rise decreasing the
efficiency. As the frequency increases the quiescent cur-
rent increases. At high frequency this current loss be-
comes significant and the power efficiency starts to de-
crease.
I = f • ∆q = f • C1 (V1 – V2)
Rewriting in terms of voltage and impedance equivalence,
V1− V2 V1− V2
I =
=
1/ fC1
R
EQUIV
A new variable REQUIV has been defined such that
REQUIV=1/fC1.Thus,theequivalentcircuitfortheswitched-
capacitor network is as shown in Figure 3.
Figure 4 shows that the LTC660 has the same switching
action as the basic switched-capacitor building block.
V1
V2
The LTC660 oscillator frequency is designed to run where
the voltage loss is a minimum. With the external 150µF
capacitors the effective output impedance is determined
by the internal switch resistances and the capacitor ESRs.
C1
C2
R
L
660 F02
Figure 2. Switched-Capacitor Building Block
LV (Pin 6)
The internal logic of the LTC660 runs between V+ and LV
(Pin6).For V+ ≥3V,aninternalswitchshortsLVtoground
(Pin 3). For V+ < 3V, the LV pin should be tied to ground.
ForV+ ≥3V,theLVpincanbetiedtogroundorleftfloating.
R
EQUIV
V1
V2
C2
R
L
OSC (Pin 7) and BOOST (Pin 1)
1
R
=
EQUIV
660 F03
fC1
The switching frequency can be raised, lowered or driven
from an external source. Figure 5 shows a functional
diagram of the oscillator circuit.
Figure 3. Switched-Capacitor Equivalent Circuit
6
LTC660
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W U U
APPLICATIONS INFORMATION
+
+
V
V
REQUIRED FOR TTL LOGIC
1
2
3
4
8
7
100k
NC
7.0I
I
OSC INPUT
+
LTC660
6
BOOST
(1)
C1
5
+
–(V )
C2
+
OSC
(7)
SCHMITT
TRIGGER
LTC660 • F06
Figure 6. External Clocking
18pF
7.0I
I
LV
(6)
Capacitor Selection
LTC660 • F05
While the exact values of C1 and C2 are noncritical, good
quality, low ESR capacitors are necessary to minimize
voltagelossesathighcurrents.ForC1theeffectoftheESR
of the capacitor will be multiplied by four, due to the fact
the switch currents are approximately two times higher
than the output current and losses will occur on both the
charge and discharge cycle. This means using a capacitor
with 1Ω of ESR for C1 will have the same effect as
increasing the output impedance of the LTC660 by 4Ω.
Thisrepresentsasignificantincreaseinthevoltagelosses.
For C2 the effect of ESR is less dramatic. A C2 with 1Ω of
ESR will increase the output impedance by 1Ω. The size
of C2 and the load current will determine the output
voltage ripple. It is alternately charged and discharged at
a current approximately equal to the output current. This
will cause a step function to occur in the output voltage at
the switch transitions. For example, for a switching fre-
quency of 5kHz (one-half the nominal 10kHz oscillator
frequency) and C2 = 150µF with an ESR of 0.2Ω, ripple is
approximately 90mV with a 100mA load current.
Figure 5. Oscillator
By connecting the BOOST pin (Pin 1) toV+, the charge and
discharge current is increased and, hence, the frequency
is increased by approximately four and a half times.
Increasing the frequency will decrease output impedance
and ripple for high load currents.
Loading Pin 7 with more capacitance will lower the fre-
quency. Using the BOOST (Pin 1) in conjunction with
external capacitance on Pin 7 allows user selection of the
frequency over a wide range.
DrivingtheLTC660fromanexternalfrequencysourcecan
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 1.1µA to 8µA, so a logic gate is
capable of driving this current. (A CMOS logic gate can be
usedtodrivetheOSCpin.)For5Vapplications, aTTLlogic
gate can be used by simply adding an external pull-up
resistor (see Figure 6).
7
LTC660
U
TYPICAL APPLICATIONS N
Negative Voltage Converter
Voltage Doubling
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 ground (Pin 3)
for V+ ≥ 3V.
Figure 8 shows the LTC660 operating in the voltage
doubling mode. The external Schottky (1N5817) diode is
for start-up only. The output voltage is 2 • VIN without a
load. The diode has no effect on the output voltage.
1N5817*
1
2
3
4
8
7
6
5
+
V
= 2V
IN
BOOST
V
OUT
1
2
3
4
8
7
6
5
V
+
IN
1.5V TO 5.5V
BOOST
V
+
C2
+
CAP
OSC
LV
+
+
150µF
C1
150µF
CAP
OSC
LV
LTC660
+
LTC660
GND
V
C1
150µF
IN
GND
2.5V
–
CAP
V
TO 5.5V
OUT
–
CAP
V
OUT
V
OUT
= –V
IN
C2
150µF
* SCHOTTKY DIODE IS FOR START-UP ONLY
LTC660 • F08
+
LTC660 • F07
Figure 8. Voltage Doubler
Figure 7. Voltage Inverter
Ultraprecision Voltage Divider
The output voltage (Pin 5) characteristics of the circuit are
those of a nearly ideal voltage source in series with a 6.5Ω
resistor. The 6.5Ω 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.
An ultraprecision voltage divider is shown in Figure 9. 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
2
3
4
8
7
6
5
V
3V TO 11V
At an oscillator frequency of 10kHz and C1 = 150µF, the
first term is:
+
LTC660
C1
150µF
1
+
V
± 0.002%
REQUIV
=
=
2
+
fOSC/2 C1
T
≤ T ≤ T
(
)
MIN
A MAX
C2
150µF
I
≤ 100nA
L
1
LTC660 • F09
= 1.3Ω.
5 • 103 • 150 • 10–6
Figure 9. Ultraprecision Voltage Divider
Notice that the equation for REQUIV is not a capacitive
reactance equation (XC = 1/ωC) and does not contain a
2π term.
Battery Splitter
The exact expression for output impedance is complex,
butthedominanteffectofthecapacitorisclearlyshownon
the typical curves of output impedance and power effi-
ciency versus frequency. For C1 = C2 = 150µF, the output
impedance goes from 6.5Ω at fOSC = 10kHz to 110Ω at
fOSC = 100Hz. As the 1/fC term becomes large compared
to the switch on-resistance term, the output resistance is
determined by 1/fC only.
A common need in many systems is to obtain positive and
negative supplies from a single battery or single power
supplysystem. Wherecurrentrequirementsaresmall, the
circuit shown in Figure 10 is a simple solution. It provides
symmetrical positive or negative output voltages, both
equaltoone-halftheinputvoltage.Theoutputvoltagesare
both referenced to Pin 3 (Output Common).
8
LTC660
U
TYPICAL APPLICATIONS N
Paralleling for Lower Output Resistance
V
B
(9V)
1
2
3
8
7
6
+V /2 (4.5V)
B
Additional flexibility of the LTC660 is shown in Figures 11
and 12. Figure 11 shows two LTC660s 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 fre-
quency will be of more benefit than the paralleling circuit
shown.
+
LTC660
C1
150µF
4
5
–V /2 (–4.5V)
B
C2
150µF
+
OUTPUT COMMON
3V ≤ V ≤ 11V
B
LTC1046 • TA10
Stacking for Higher Voltage
Figure 10. Battery Splitter
Figure12makesuseof“stacking”twoLTC660stoprovide
even higher voltages. In Figure 12, a negative voltage
doubler or tripler can be achieved depending upon how
Pin 8 of the second LTC660 is connected, as shown
schematically by the switch.
+
V
1
2
3
4
8
7
6
5
1
2
8
7
6
5
+
+
LTC660
3
LTC660
C1
150µF
C1
150µF
4
+
V
= –V
OUT
C2
150µF
1/4 CD4077
+
OPTIONAL SYNCHRONIZATION
CIRCUIT TO MINIMIZE RIPPLE
LTC660 • F11
Figure 11. Paralleling for 200mA Load Current
+
+
FOR V
= –3V
FOR V
= –2V
OUT
OUT
+
V
1
2
3
4
8
1
2
3
4
8
7
6
5
150µF
+
7
6
5
LTC660
1
LTC660
2
+
150µF
+
V
–V
OUT
150µF
150µF
+
+
LTC660 • F12
Figure 12. Stacking for High Voltage
9
LTC660
U
PACKAGE DESCRIPTION
Dimensions in inches (millimeters) unless otherwise noted.
N8 Package
8-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.400*
(10.160)
MAX
8
7
6
5
4
0.255 ± 0.015*
(6.477 ± 0.381)
1
2
3
0.130 ± 0.005
0.300 – 0.325
0.045 – 0.065
(3.302 ± 0.127)
(1.143 – 1.651)
(7.620 – 8.255)
0.065
(1.651)
TYP
0.009 – 0.015
(0.229 – 0.381)
0.125
0.020
(0.508)
MIN
(3.175)
MIN
+0.035
0.325
–0.015
0.100 ± 0.010
(2.540 ± 0.254)
0.018 ± 0.003
(0.457 ± 0.076)
+0.889
8.255
(
)
N8 1197
–0.381
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
10
LTC660
U
PACKAGE DESCRIPTION
Dimensions in inches (millimeters) unless otherwise noted.
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.189 – 0.197*
(4.801 – 5.004)
7
5
8
6
0.150 – 0.157**
(3.810 – 3.988)
0.228 – 0.244
(5.791 – 6.197)
1
0.053 – 0.069
3
4
2
0.010 – 0.020
(0.254 – 0.508)
× 45°
(1.346 – 1.752)
0.004 – 0.010
(0.101 – 0.254)
0.008 – 0.010
(0.203 – 0.254)
0°– 8° TYP
0.016 – 0.050
0.406 – 1.270
0.050
(1.270)
TYP
0.014 – 0.019
(0.355 – 0.483)
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
SO8 0996
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-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
11
LTC660
U
TYPICAL APPLICATIONS N
Voltage Inverter
1
8
V
+
IN
1.5V TO 5.5V
BOOST
V
2
3
4
7
6
5
+
CAP
OSC
LV
+
LTC660
C1
150µF
GND
–
CAP
V
OUT
V
OUT
= –V
IN
C2
150µF
+
LTC660 • F07
Voltage Doubler
1N5817*
1
8
+
V
= 2V
IN
BOOST
V
OUT
+
2
3
4
7
6
5
C2
150µF
+
CAP
OSC
LV
+
C1
150µF
LTC660
GND
V
IN
2.5V
–
CAP
V
OUT
TO 5.5V
* SCHOTTKY DIODE IS FOR START-UP ONLY
LTC660 • F08
RELATED PARTS
PART NUMBER
Unregulated Output Voltage
LTC660
OUTPUT CURRENT
MAXIMUM V
COMMENTS
IN
100mA
50mA
20mA
20mA
20mA
6V
6V
Highest Current
Lowest Cost
LTC1046
LTC1044
9.5V
13V
20V
LTC1044A
LTC1144
Highest Voltage
Regulated Output Voltage
LT1054
100mA
30mA
10mA
16V
6V
Adjustable Output
12V Fixed Output
LTC1262
LTC1261
9V
–4V, –4.5V and Adjustable
Outputs
All devices are available in plastic 8-lead SO and PDIP packages
LT/GP 0598 2K REV A • PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 1995
12 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
●
●
(408)432-1900 FAX:(408)434-0507 www.linear-tech.com
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