LT1054CSW#TRPBF [Linear]
LT1054 - Switched-Capacitor Voltage Converter with Regulator; Package: SO; Pins: 16; Temperature Range: 0°C to 70°C;型号: | LT1054CSW#TRPBF |
厂家: | Linear |
描述: | LT1054 - Switched-Capacitor Voltage Converter with Regulator; Package: SO; Pins: 16; Temperature Range: 0°C to 70°C 光电二极管 |
文件: | 总16页 (文件大小:288K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
LT1054/LT1054L
Switched-Capacitor Voltage
Converter with Regulator
Features
Description
The LT ®1054 is a monolithic, bipolar, switched-capacitor
voltage converter and regulator. The LT1054 provides
higher output current than previously available converters
with significantly lower voltage losses. An adaptive switch
driver scheme optimizes efficiency over a wide range of
output currents. Total voltage loss at 100mA output current
is typically 1.1V. This holds true over the full supply voltage
range of 3.5V to 15V. Quiescent current is typically 2.5mA.
■ꢀ
Output Current: 100mA (LT1054)
125mA (LT1054L)
■
Reference and Error Amplifier for Regulation
■
Low Loss: 1.1V at 100mA
■
Operating Range:3.5V to 15V (LT1054)
3.5V to 7V (LT1054L)
■
External Shutdown
■
External Oscillator Synchronization
■
Can Be Paralleled
The LT1054 also provides regulation, a feature not previ-
ouslyavailableinswitched-capacitorvoltageconverters.By
adding an external resistive divider a regulated output can
be obtained. This output will be regulated against changes
in both input voltage and output current. The LT1054 can
also be shut down by grounding the feedback pin. Supply
current in shutdown is less than 100µA.
Pin Compatible with the LTC®1044/ICL7660
■
■
Available in SW16 and SO-8 Packages
applications
■
Voltage Inverter
■
Voltage Regulator
The internal oscillator of the LT1054 runs at a nominal
frequency of 25kHz. The oscillator pin can be used to ad-
just the switching frequency or to externally synchronize
the LT1054.
■
Negative Voltage Doubler
Positive Voltage Doubler
■
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
The LT1054 is pin compatible with previous converters
such the LTC1044/ICL7660.
Block Diagram
V
REF
6
V
IN
LT1054/LT1054 Voltage Loss
8
2
2.5V
3.5V ≤ V ≤ 15V (LT1054)
IN
REFERENCE
LT1054L
3.5V ≤ V ≤ 7V (LT1054L)
IN
R
DRIVE
CAP
C
= C
= 100µF
OUT
IN
INDICATES GUARANTEED
TEST POINT
+
–
+
–
2
4
+
C
*
LT1054
IN
Q
1
FEEDBACK/
SHUTDOWN
1
0
OSC
Q
CAP
7
R
T
T
T
= 125°C
= 25°C
= –55°C
J
J
J
OSC
DRIVE
DRIVE
DRIVE
3
5
GND
+
*EXTERNAL CAPACITORS
C
*
0
25
50
75
100
125
OUT
OUTPUT CURRENT (mA)
–V
OUT
1054 TA01•
LT1054 • BD
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For more information www.linear.com/LT1054
LT1054/LT1054L
aBsolute maximum ratings (Note 1)
Supply Voltage (Note 2)
Maximum Junction Temperature (Note 3)
LT1054 .................................................................16V
LT1054L .................................................................7V
LT1054C/LT1054LC ......................................... 125°C
LT1054I............................................................. 125°C
LT1054M........................................................... 150°C
Storage Temperature Range
J8, N8 and S8 Packages.................... –55°C to 150°C
S Package......................................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
Input Voltage
+
+
Pin 1 ................................................. 0V ≤ V
Pin 3 (S Package) ............................. 0V ≤ V
Pin 7 .............................................. 0V ≤ V
≤ V
≤ V
PIN1
PIN3
≤ V
PIN7
REF
Pin 13 (S Package) ...................... 0V ≤ V
≤ V
PIN13
REF
Operating Junction Temperature Range
LT1054C/LT1054LC .............................. 0°C to 100°C
LT1054I............................................. –40°C to 100°C
LT1054M............................................ –55°C to 125°C
pin conFiguration
TOP VIEW
TOP VIEW
NC
NC
1
2
3
4
5
6
7
8
16 NC
TOP VIEW
+
FB/SHDN
1
2
3
4
8
7
6
5
V
15 NC
+
+
+
FB/SHDN
1
2
3
4
V
8
7
6
5
CAP
OSC
FB/SHDN
14
V
+
+
CAP
OSC
CAP
13 OSC
GND
V
REF
–
GND
12
11
10
9
GND
V
V
V
CAP
V
REF
REF
OUT
–
–
CAP
CAP
V
OUT
OUT
S8 PACKAGE
8-LEAD PLASTIC SO
= 125°C, θ = 120°C/W
NC
NC
NC
NC
N8 PACKAGE
8-LEAD PLASTIC DIP 8-LEAD CERAMIC DIP
= 125°C, θ = 130°C/W
J8 PACKAGE
T
JMAX
JA
SEE REGULATION AND CAPACITOR SELECTION SECTIONS
IN THE APPLICATIONS INFORMATION FOR IMPORTANT
INFORMATION ON THE S8 DEVICE
T
JMAX
JA
SW PACKAGE
16-LEAD PLASTIC SO
T
JMAX
= 125°C, θ = 150°C/W
JA
orDer inFormation
LEAD FINISH
TAPE AND REEL
PART MARKING
LT1054CN8
LT1054IN8
LT1054MJ8
1054
PACKAGE DESCRIPTION
8-Lead Plastic DIP
8-Lead Plastic DIP
8-Lead Ceramic DIP
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
16-Lead Plastic SO
16-Lead Plastic SO
8-Lead Ceramic DIP
TEMPERATURE RANGE
0°C to 100°C
LT1054CN8#PBF
LT1054IN8#PBF
LT1054MJ8
–40°C to 100°C
–55°C to 125°C
0°C to 100°C
LT1054CS8#PBF
LT1054LCS8#PBF
LT1054IS8#PBF
LT1054CSW#PBF
LT1054ISW#PBF
LT1054CS8#TRPBF
LT1054LCS8#TRPBF
LT1054IS8#TRPBF
LT1054CSW#TRPBF
LT1054ISW#TRPBF
1054L
0°C to 100°C
1054I
–40°C to 100°C
0°C to 100°C
LT1054CSW
LT1054ISW
LT1054CJ8
–40°C to 100°C
0°C to 100°C
LT1054CJ8#PBF OBSOLETE PART LT1054CJ8#TRPBF
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard 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/
1054lfh
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For more information www.linear.com/LT1054
LT1054/LT1054L
electrical characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 7)
PARAMETER
CONDITIONS
= 0mA
MIN
TYP
MAX
UNITS
l
l
Supply Current
I
LT1054:
V
IN
V
IN
= 3.5V
= 15V
2.5
3.0
4.0
5.0
mA
mA
LOAD
l
l
LT1054L: V = 3.5V
2.5
3.0
4.0
5.0
mA
mA
IN
V
= 7V
IN
l
l
Supply Voltage Range
LT1054
LT1054L
3.5
3.5
15
7
V
V
Voltage Loss (V – |V |)
C
= C
= 100µF Tantalum (Note 4)
OUT
IN
OUT
IN
l
l
l
I
I
I
= 10mA
0.35
1.10
1.35
0.55
1.60
1.75
V
V
V
OUT
OUT
OUT
= 100mA
= 125mA (LT1054L)
l
Output Resistance
10
15
Ω
∆I
= 10mA to 100mA (Note 5)
OUT
l
l
Oscillator Frequency
LT1054: 3.5V ≤ V ≤ 15V
15
15
25
25
40
35
kHz
kHz
IN
LT1054L: 3.5V ≤ V ≤ 7V
IN
Reference Voltage
I
= 60µA, T = 25°C
2.35
2.25
2.50
2.65
2.75
V
V
REF
J
l
Regulated Voltage
Line Regulation
Load Regulation
V
= 7V, T = 25°C, R = 500Ω (Note 6)
–4.70
–5.00
5
–5.20
25
V
mV
mV
mA
µA
IN
J
L
l
l
LT1054: 7V ≤ V ≤ 12V, R = 500Ω (Note 6)
IN
L
V
= 7V, 100Ω ≤ 500Ω (Note 6)
10
50
IN
Maximum Switch Current
300
100
l
Supply Current in Shutdown
V
= 0V
200
PIN1
Note 5: Output resistance is defined as the slope of the curve, (∆V
OUT
portion of the curve. The incremental slope of the curve will be higher at
currents <10mA due to the characteristics of the switch transistors.
vs
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.
OUT
∆I ), for output currents of 10mA to 100mA. This represents the linear
Note 6: All regulation specifications are for a device connected as a
positive-to-negative converter/regulator with R1 = 20k, R2 = 102.5k,
Note 2: The absolute maximum supply voltage rating of 16V is for
unregulated circuits using LT1054. For regulation mode circuits using
C1 = 0.002µF, (C1 = 0.05µF S package) C = 10µF tantalum, C
= 100µF
LT1054 with V
≤ 15V at Pin 5 (Pin 11 on S package), this rating may be
IN
OUT
OUT
tantalum.
increased to 20V. The absolute maximum supply voltage for LT1054L is 7V.
Note 7: The S8 package uses a different die than the H, J8, N8 and S
packages. The S8 device will meet all the existing data sheet parameters.
See Regulation and Capacitor Selection in the Applications Information
section for differences in application requirements.
Note 3: The devices are guaranteed by design to be functional up to the
absolute maximum junction temperature.
Note 4: For voltage loss tests, the device is connected as a voltage inverter,
with pins 1, 6, and 7 (3, 12, and 13 S package) unconnected. The voltage
losses may be higher in other configurations.
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For more information www.linear.com/LT1054
LT1054/LT1054L
typical perFormance characteristics
Shutdown Threshold
Supply Current
Oscillator Frequency
0.6
0.5
0.4
0.3
5
4
3
2
35
25
15
I
L
= 0
V
PIN1
V
= 15V
IN
V
IN
= 3.5V
0.2
0.1
0
1
0
50
TEMPERATURE (°C)
100 125
–50 –25
0
25
75
0
10
5
INPUT VOLTAGE (V)
15
–70 –50
50
TEMPERATURE (°C)
100 125
–25
0
25
75
LT1054 • TPC01
LT1054 • TPC02
LT1054 • TPC03
Supply Current in Shutdown
Average Input Current
Output Voltage Loss
120
100
80
60
40
20
0
140
120
1.4
1.2
I
= 100mA
OUT
V
= 0V
PIN1
100
1.0
80
60
40
20
0.8
0.6
0.4
0.2
I
I
= 50mA
= 10mA
OUT
OUT
INVERTER CONFIGURATION
C
= 100µF TANTALUM
= 25kHz
OUT
OSC
f
0
0
0
60
OUTPUT CURRENT (mA)
80
100
0
10
5
INPUT VOLTAGE (V)
15
20
40
100
50 60 70 80 90
0
30
10 20
40
INPUT CAPACITANCE (µF)
LT1054 • TPC04
LT1050 • TPC05
LT1054 • TPC06
Output Voltage Loss
Output Voltage Loss
INVERTER CONFIGURATION
INVERTER CONFIGURATION
C
C
= 10µF TANTALUM
IN
= 100µF TANTALUM
OUT
C
C
= 100µF TANTALUM
IN
= 100µF TANTALUM
OUT
2
1
0
2
1
0
I
= 100mA
OUT
I
= 100mA
= 50mA
OUT
I
I
= 50mA
= 10mA
OUT
OUT
I
I
OUT
OUT
= 10mA
1
10
OSCILLATOR FREQUENCY (kHz)
100
1
10
100
OSCILLATOR FREQUENCY (kHz)
LT1054 • TPC07
LT1054 • TPC08
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For more information www.linear.com/LT1054
LT1054/LT1054L
typical perFormance characteristics
Reference Voltage Temperature
Coefficient
Regulated Output Voltage
–4.7
–4.8
100
80
V
REF
AT 0 = 2.500V
–4.9
60
–5.0
40
–5.1
20
–11.6
–11.8
–12.0
–12.2
–12.4
–12.6
0
–20
–40
–60
–80
–100
–50
0
25
50
75 100 125
–50
0
25
50
75 100 125
–25
–25
TEMPERATURE (°C)
TEMPERATURE (°C)
LT1054 • TPC09
LT1054 • TPC10
pin Functions
FB/SHDN (Pin 1): Feedback/Shutdown Pin. This pin has
twofunctions.PullingPin1belowtheshutdownthreshold
(≈0.45V) puts the device into shutdown. In shutdown the
reference/regulator is turned off and switching stops. The
switchesaresetsuchthatbothC andC aredischarged
Pin 1 is also the inverting input of the LT1054’s error
amplifier and as such can be used to obtain a regulated
output voltage.
+
–
CAP /CAP (Pin 2/Pin 4): Pin 2, the positive side of the
+
IN
OUT
input capacitor (C ), is alternately driven between V
IN
through the output load. Quiescent current in shutdown
drops to approximately 100µA (see Typical Performance
Characteristics). Any open-collector gate can be used to
put the LT1054 into shutdown. For normal (unregulated)
operation the device will start back up when the external
gate is shut off. In LT1054 circuits that use the regulation
feature, the external resistor divider can provide enough
pull-down to keep the device in shutdown until the output
+
and ground. When driven to V , Pin 2 sources current
+
from V . When driven to ground Pin 2 sinks current to
ground. Pin 4, the negative side of the input capacitor, is
driven alternately between ground and V . When driven
OUT
to ground, Pin 4 sinks current to ground. When driven to
V
Pin 4 sources current from C . In all cases current
OUT
OUT
flowintheswitchesisunidirectionalasshouldbeexpected
using bipolar switches.
capacitor (C ) has fully discharged. For most applica-
OUT
V
OUT
(Pin 5): In addition to being the output pin this pin
tions where the LT1054 would be run intermittently, this
does not present a problem because the discharge time
of the output capacitor will be short compared to the off-
time of the device. In applications where the device has
is also tied to the substrate of the device. Special care
must be taken in LT1054 circuits to avoid pulling this
pin positive with respect to any of the other pins. Pulling
Pin 5 positive with respect to Pin 3 (GND) will forward
biasthesubstratediodewhichwillpreventthedevicefrom
starting. This condition can occur when the output load
driven by the LT1054 is referred to its positive supply (or
to some other positive voltage). Note that most op amps
present just such a load since their supply currents flow
to start up before the output capacitor (C ) has fully
OUT
discharged, a restart pulse must be applied to Pin 1 of
the LT1054. Using the circuit of Figure 5, the restart signal
can be either a pulse (t > 100µs) or a logic high. Diode
p
coupling the restart signal into Pin 1 will allow the output
voltage to come up and regulate without overshoot. The
resistor divider R3/R4 in Figure 5 should be chosen to
provide a signal level at pin 1 of 0.7V to 1.1V.
+
–
from their V terminals to their V terminals. To prevent
start-up problems with this type of load an external
1954lfh
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For more information www.linear.com/LT1054
LT1054/LT1054L
pin Functions
transistor must be added as shown in Figure 1. This will
OSC (Pin 7): Oscillator Pin. This pin can be used to raise
or lower the oscillator frequency or to synchronize the
device to an external clock. Internally Pin 7 is connected
prevent V
(Pin 5) from being pulled above the ground
OUT
pin (Pin 3) during start-up. Any small, general purpose
to the oscillator timing capacitor (C ≈ 150pF) which is
transistor such as 2N2222 or 2N2219 can be used. R
t
X
alternately charged and discharged by current sources of
7µAsothatthedutycycleis≈50ꢀ. TheLT1054oscillator
is designed to run in the frequency band where switch-
ing losses are minimized. However the frequency can be
raised, lowered, or synchronized to an external system
clock if necessary.
should be chosen to provide enough base drive to the
external transistor so that it is saturated under nominal
output voltage and maximum output current conditions.
In some cases an N-channel enhancement mode MOSFET
can be used in place of the transistor.
V
β
(
)
OUT
RX ≤
The frequency can be lowered by adding an external
capacitor (C1, Figure 2) from Pin 7 to ground. This will
increase the charge and discharge times which lowers the
oscillator frequency. The frequency can be increased by
adding an external capacitor (C2, Figure 2, in the range
of 5pF to 20pF) from Pin 2 to Pin 7. This capacitor will
IOUT
+
V
I
L
I
Q
+
–
LOAD
couple charge into C at the switch transitions, which will
T
I
OUT
+
shorten the charge and discharge time, raising the oscil-
lator frequency. Synchronization can be accomplished
by adding an external resistive pull-up from Pin 7 to the
reference pin (Pin 6). A 20k pull-up is recommended. An
open collector gate or an NPN transistor can then be used
to drive the oscillator pin at the external clock frequency
as shown in Figure 2. Pulling up Pin 7 to an external volt-
age is not recommended. For circuits that require both
frequency synchronization and regulation, an external
reference can be used as the reference point for the top
of the R1/R2 divider allowing Pin 6 to be used as a pull-
up point for Pin 7.
FB/SHDN
V
+
CAP
OSC
LT1054 • F01
+
R
LT1054
GND
X
C
IN
V
REF
–
CAP
V
OUT
C
OUT
+
Figure 1
V
(Pin 6): Reference Output. This pin provides a 2.5V
REF
referencepointforuseinLT1054-basedregulatorcircuits.
The temperature coefficient of the reference voltage has
been adjusted so that the temperature coefficient of the
regulated output voltage is close to zero. This requires the
referenceoutputtohaveapositivetemperaturecoefficient
as can be seen in the typical performance curves. This
nonzero drift is necessary to offset a drift term inherent
in the internal reference divider and comparator network
tied to the feedback pin. The overall result of these drift
terms is a regulated output which has a slight positive
temperature coefficient at output voltages below 5V and a
slight negative TC at output voltages above 5V. Reference
output current should be limited, for regulator feedback
networks, to approximately 60µA. The reference pin will
draw ≈100µA when shorted to ground and will not af-
fect the internal reference/regulator, so that this pin can
also be used as a pull-up for LT1054 circuits that require
synchronization.
+
V
IN
FB/SHDN
V
C2
C1
+
CAP
OSC
+
LT1054
GND
C
IN
V
REF
LT1054 • F02
–
CAP
V
OUT
C
OUT
+
Figure 2
+
V (Pin 8): Input Supply. The LT1054 alternately charges
to the input voltage when C is switched in parallel
C
IN
IN
with the input supply and then transfers charge to C
OUT
when C is switched in parallel with C . Switching oc-
curs at the oscillator frequency. During the time that C
IN
OUT
IN
1054lfh
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For more information www.linear.com/LT1054
LT1054/LT1054L
pin Functions
is charging, the peak supply current will be approximately
capacitorof2µF,preferablytantalumorsomeotherlowESR
type is recommended. A larger capacitor may be desirable
in some cases, for example, when the actual input supply
is connected to the LT1054 through long leads, or when
the pulse current drawn by the LT1054 might affect other
circuitry through supply coupling.
equal to 2.2 times the output current. During the time that
C is delivering charge to C
the supply current drops
IN
OUT
to approximately 0.2 times the output current. An input
supply bypass capacitor will supply part of the peak input
current drawn by the LT1054 and average out the current
drawn from the supply. A minimum input supply bypass
applications inFormation
Theory of Operation
V1
V2
f
R
To understand the theory of operation of the LT1054, a re-
viewofabasicswitched-capacitorbuildingblockishelpful.
L
C1
C2
LT1054 • F03
In Figure 3 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:
Figure 3. Switched-Capacitor Building Block
R
EQUIV
V1
V2
1
fC1
R
L
C2
R
EQUIV
=
LT1054 • F04
Figure 3. Switched-Capacitor Equivalent Circuit
∆q = q1 – q2 = C1(V1 – V2)
eventually be dominated by the 1/fC1 term and voltage
losses will rise.
If the switch is cycled f times per second, the charge
transfer per unit time (i.e., current) is:
Note that losses also rise as frequency increases. This is
caused by internal switching losses which occur due to
somefinitechargebeinglostoneachswitchingcycle.This
chargelossper-unit-cycle,whenmultipliedbytheswitching
frequency, becomes a current loss. At high frequency this
loss becomes significant and voltage losses again rise.
I = (f)(∆q) = (f)[C1(V1 – V2)]
To obtain an equivalent resistance for the switched-
capacitor network we can rewrite this equation in terms
of voltage and impedance equivalence:
V1– V2 V1– V2
1/ fC1 REQUIV
I=
=
The oscillator of the LT1054 is designed to run in the
frequency band where voltage losses are at a minimum.
A new variable R
is defined such that R
= 1/fC1.
EQUIV
EQUIV
Thus the equivalent circuit for the switched-capacitor
network is as shown in Figure 4. The LT1054 has the same
switching action as the basic switched-capacitor building
block.Eventhoughthissimplificationdoesn’tincludefinite
switchon-resistanceandoutputvoltageripple, itprovides
anintuitivefeelforhowthedeviceworks.
Regulation
T
he error amplifier of the LT1054 servos the drive to the
PNPswitchtocontrolthevoltageacrosstheinputcapaci-
tor (C ) which in turn will determine the output voltage.
IN
Using the reference and error amplifier of the LT1054,
an external resistive divider is all that is needed to set
the regulated output voltage. Figure 5 shows the basic
regulator configuration and the formula for calculating
the appropriate resistor values. R1 should be chosen to
1954lfh
These simplified circuits explain voltage loss as a function
of frequency (see Typical Performance Characteristics).
As frequency is decreased, the output impedance will
7
For more information www.linear.com/LT1054
LT1054/LT1054L
applications inFormation
ground pin of the LT1054 must be less than the total of the
supply voltage minus the voltage loss due to the switches.
Thevoltagelossversusoutputcurrentduetotheswitches
canbefoundinTypicalPerformanceCharacteristics.Other
configurations such as the negative doubler can provide
higher output voltages at reduced output currents (see
Typical Applications).
2.2µF
R3
V
IN
+
+
FB/SHDN
V
+
CAP
OSC
C
10µF
TANTALUM
+
IN
R4
LT1054
GND
R1
R2
V
REF
–
CAP
V
OUT
C1
RESTART SHUTDOWN
V
OUT
|V
REF
|
|V
|
OUT
R2
R1
OUT
=
+ 1 ≈
+ 1
Capacitor Selection
V
1.21V
C
OUT
– 40mV
)
)
)
)
100µF
TANTALUM
2
+
ForunregulatedcircuitsthenominalvaluesofC andC
WHERE V
= 2.5V NOMINAL
IN
OUT
REF
LT1054 • F05
should be equal. For regulated circuits see the section on
FOR EXAMPLE: TO GET V
PIN OF THE LT1054, CHOOSE R1 = 20k, THEN
= –5V REFERRED TO THE GROUND
OUT
Regulation. While the exact values of C and C
are
IN
OUT
|–5V|
noncritical, goodquality, lowESRcapacitorssuchassolid
R2 = 20k
+ 1 = 102.6k*
2.5V
)
)
– 40mV
tantalum are necessary to minimize voltage losses at high
currents. For C the effect of the ESR of the capacitor will
2
*CHOOSE THE CLOSEST 1% VALUE
IN
be multiplied by four due to the fact that switch currents
areapproximatelytwotimeshigherthanoutputcurrentand
losses will occur on both the charge and discharge cycle.
Figure 5
be 20k or greater because the reference output current
is limited to ≈100µA. R2 should be chosen to be in the
range of 100k to 300k. For optimum results the ratio of
This means that using a capacitor with 1Ω of ESR for C
IN
will have the same effect as increasing the output imped-
C /C
is recommended to be 1/10. C1, required for
IN OUT
ance of the LT1054 by 4Ω. This represents a significant
good load regulation at light load currents, should be
increaseinthevoltagelosses. ForC
theaffectofESRis
OUT
0.002µF for all output voltages.
less dramatic. C
is alternately charged and discharged
OUT
at a current approximately equal to the output current and
the ESR of the capacitor will cause a step function to oc-
cur 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 parallela 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).
A new die layout was required to fit into the physical
dimensions of the S8 package. Although the new die
of the LT1054CS8 will meet all the specifications of the
existing LT1054 data sheet, subtle differences in the
layout of the new die require consideration in some ap-
plication circuits. In regulating mode circuits using the
1054CS8 the nominal values of the capacitors, C and
IN
C
OUT
, must be approximately equal for proper operation
at elevated junction temperatures. This is different from
the earlier part. Mismatches within normal production
tolerances for the capacitors are acceptable. Making the
nominal capacitor values equal will ensure proper opera-
tion at elevated junction temperatures at the cost of a
small degradation in the transient response of regulator
Output Ripple
circuits. For unregulated circuits the values of C and
IN
C
OUT
are normally equal for all packages. For S8 applica-
The peak-to-peak output ripple is determined by the value
of the output capacitor and the output current. Peak-to-
peak output ripple may be approximated by the formula:
tions assistance in unusual applications circuits, please
consult the factory.
It can be seen from the circuit block diagram that the
maximumregulatedoutputvoltageislimitedbythesupply
voltage. For the basic configuration, |VOUT|referred to the
IOUT
dV =
2fCOUT
1054lfh
8
For more information www.linear.com/LT1054
LT1054/LT1054L
applications inFormation
wheredV=peak-to-peakrippleandf=oscillatorfrequency.
where:
For output capacitors with significant ESR a second term
mustbeaddedtoaccountforthevoltagestepattheswitch
transitions. This step is approximately equal to:
V ≈ V – [(LT1054 Voltage Loss)(1.3) + |VOUT|]
X
IN
and I
= maximum required output current. The factor
OUT
of 1.3 will allow some operating margin for the LT1054.
(2I )(ESR of C
)
OUT
OUT
For example: assume a 12V to –5V converter at 100mA
outputcurrent.Firstcalculatethepowerdissipationwithout
an external resistor:
Power Dissipation
The power dissipation of any LT1054 circuit must be
limited such that the junction temperature of the device
does not exceed the maximum junction temperature rat-
ings. The total power dissipation must be calculated from
two components, the power loss due to voltage drops
in the switches and the power loss due to drive current
losses. The total power dissipated by the LT1054 can be
calculated from:
P = (12V – |–5V|)(100mA) + (12V)(100mA)(0.2)
P = 700mW + 240mW = 940mW
At θ of 130°C/W for a commercial plastic device this
JA
would cause a junction temperature rise of 122°C so that
the device would exceed the maximum junction tempera-
ture at an ambient temperature of 25°C. Now calculate the
power dissipation with an external resistor (R ). First find
X
how much voltage can be dropped across R . The maxi-
X
P ≈ (V – |VOUT|)(I ) + (V )(I )(0.2)
IN
OUT
IN OUT
mum voltage loss of the LT1054 in the standard regulator
where both V and V
are referred to the ground pin
configuration at 100mA output current is 1.6V, so:
IN
OUT
(Pin 3) of the LT1054. For LT1054 regulator circuits, the
power dissipation will be equivalent to that of a linear
regulator. Due to the limited power handling capability of
the LT1054 packages, the user will have to limit output
currentrequirementsortakestepstodissipatesomepower
external to the LT1054 for large input/output differentials.
This can be accomplished by placing a resistor in series
V = 12V – [(1.6V)(1.3) + |–5V|] = 4.9V and
X
R = 4.9V/(4.4)(100mA) = 11Ω
X
This resistor will reduce the power dissipated by the
LT1054 by (4.9V)(100mA) = 490mW. The total power dis-
sipated by the LT1054 would then be (940mW – 490mW)
= 450mW. The junction temperature rise would now be
only 58°C. Although commercial devices are guaranteed
to be functional up to a junction temperature of 125°C, the
specifications are only guaranteed up to a junction tem-
perature of 100°C, so ideally you should limit the junction
temperature to 100°C. For the above example this would
mean limiting the ambient temperature to 42°C. Other
steps can be taken to allow higher ambient temperatures.
The thermal resistance numbers for the LT1054 packages
represent worst-case numbers with no heat sinking and
still air. Small clip-on type heat sinks can be used to lower
the thermal resistance of the LT1054 package. In some
systems there may be some available airflow which will
helptolowerthethermalresistance. WidePCboardtraces
from the LT1054 leads can also help to remove heat from
the device. This is especially true for plastic packages.
with C as shown in Figure 6. A portion of the input
IN
voltage will then be dropped across this resistor without
affecting the output regulation. Because switch current is
approximately2.2timestheoutputcurrentandtheresistor
will cause a voltage drop when C is both charging and
IN
discharging, the resistor should be chosen as:
R = V /(4.4 I
)
X
X
OUT
V
IN
+
FB/SHDN
V
R
X
+
CAP
OSC
+
LT1054
R1
R2
C1
C
IN
GND
V
REF
–
CAP
V
OUT
V
OUT
C
OUT
+
LT1054 • F06
Figure 6
1954lfh
9
For more information www.linear.com/LT1054
LT1054/LT1054L
typical applications
Basic Voltage Inverter
Basic Voltage Inverter/Regulator
+
2µF
V
IN
V
FB/SHDN
V
IN
+
+
+
FB/SHDN
V
2µF
+
CAP
OSC
+
LT1054
GND
+
CAP
OSC
100µF
V
REF
+
LT1054
GND
R1
R2
10µF
V
REF
–
–V
100µF
CAP
V
OUT
OUT
–
+
CAP
V
OUT
0.002µF
LT1054 • TAO2
V
OUT
|V
REF
|
|V
|
R2
R1
OUT
OUT
1.21V
=
+ 1 =
+ 1 ,
100µF
V
+
)
)
)
)
– 40mV
2
LT1054 • TA03
REFER TO FIGURE 5
Negative Voltage Doubler
Positive Doubler
V
IN
+
FB/SHDN
V
+
–
3.5V TO 15V
1N4001
100µF
1N4001
V
OUT
+
CAP
OSC
+
+
+
+
LT1054
GND
V
OUT
+
2µF
10µF
FB/SHDN
V
50mA
V
IN
REF
Q *
X
100µF
–
+
–
V
CAP
V
OUT
R *
X
100µF
2µF
+
+
CAP
LT1054
GND
OSC
+
V
REF
V
V
V
= 3.5V TO 15V
IN
OUT
V
IN
≈ 2V – (V + 2V )
V
V
= –3.5V TO –15V
–
IN
L
DIODE
IN
CAP
V
OUT
= LT1054 VOLTAGE LOSS
L
= 2V + (LT1054 VOLTAGE LOSS) + (Q SATURATION VOLTAGE)
OUT
IN
X
LT1054 • TAO5
*SEE FIGURE 3
LT1054 • TAO4
100mA Regulating Negative Doubler
V
IN
3.5 TO 15V
+
2.2µF
+
+
FB/SHDN
V
FB/SHDN
V
HP5082-2810
PIN 2
LT1054 #1
+
+
CAP
OSC
CAP
OSC
V
OUT
+
+
+
+
LT1054 #1
GND
LT1054 #2
GND
20k
SET
10µF
10µF
10µF
10µF
V
V
REF
REF
R1
40k
–
–
CAP
V
OUT
CAP
V
OUT
1N4002
1N4002
10µF
10µF
+
0.002µF
+
R2
500k
1N4002
1N4002
–V
OUT
OUT
I
≅ 100mA MAX
1N4002
V
V
= 3.5 TO 15V
100µF
IN
+
LT1054 • TAO6
MAX ≈ –2V + [1054 VOLTAGE LOSS + 2(V )]
OUT
IN
DIODE
|V
REF
|
|V
|
OUT
R2
R1
OUT
=
+ 1 =
+ 1
, REFER TO FIGURE 5
V
1.21V
– 40mV
)
)
2
1054lfh
10
For more information www.linear.com/LT1054
LT1054/LT1054L
typical applications
Bipolar Supply Doubler
V
IN
3.5V TO 15V
+
–
+
+
10µF
100µF
+
+V
OUT
FB/SHDN
V
+
CAP
OSC
+
+
LT1054
GND
10µF
10µF
V
REF
100µF
+
–
CAP
V
OUT
–
+
100µF
V
+V
–V
= 3.5V TO 15V
IN
+
–V
OUT
≈ 2V – (V + 2V
)
OUT
IN
L
DIODE
≈ –2V + (V + 2V
)
OUT
IN
L
DIODE
V
= LT1054 VOLTAGE LOSS
L
LT1054 • TAO7
= 1N4001
5V to 12V Converter
V
IN
= 5V
+
5µF
1N914
≈ 12V
1N914
V
OUT
OUT
+
I
= 25mA
FB/SHDN
V
+
+
+
100µF
10µF
10µF
TO PIN 4
+
+
FB/SHDN
V
CAP
OSC
LT1054 #1
+
LT1054 #1
GND
+
10µF
CAP
OSC
V
REF
LT1054 #2
GND
20k
2N2219
1k
–
V
REF
CAP
V
OUT
100µF
5µF
V
OUT
≈ –12V
= 25mA
–
OUT
+
+
CAP
V
OUT
I
100µF
+
LT1054 • TAO8
Strain Gauge Bridge Signal Conditioner
5V
10k
10k
+
INPUT TTL
OR CMOS
LOW FOR ON
10k
ZERO
TRIM
10µF
40Ω
2N2907
5k
GAIN
TRIM
8
100k
100k
5k
0.022µF
1
–
–
6
5
2
1M
301k
A1
A2
7
1/2 LT1013+ 3
1/2 LT1013
+
10k
350Ω
4
200k
1µF
LT1054 • TAO9
+
FB/SHDN
V
5V
3k
+
A = 125 FOR 0V TO 3V OUT FROM FULL-SCALE
BRIDGE OUTPUT OF 24mV
CAP
OSC
2N2222
+
LT1054
GND
+
10µF
V
100µF
TANTALUM
REF
–
CAP
V
OUT
1954lfh
11
For more information www.linear.com/LT1054
LT1054/LT1054L
typical applications
3.5V to 5V Regulator
V
IN
3.5V TO 5.5V
20k
1
2
3
4
8
7
6
5
1N914
+
LTC1044
1N914
1N914
+
1µF
FB/SHDN
V
+
5µF
+
CAP
OSC
R1
20k
R2
125k
+
LT1054
GND
10µF
V
REF
+
–
1µF
+
–
+
0.002µF
CAP
V
OUT
R2
125k
3k
V
OUT
= 5V
100µF
V
V
I
= 3.5V TO 5.5V
OUT
IN
= 5V
2N2219
= 50mA
OUT(MAX)
1N914
LT1054 • TA10
1N5817
Regulating 200mA, 12V to –5V Converter
5µF
12V
+
+
HP5082-2810
+
FB/SHDN
V
FB/SHDN
V
+
+
CAP
LT1054 #2
GND
OSC
CAP
LT1054 #1
GND
OSC
R1
39.2k
+
10Ω
1/2W
20k
10Ω
1/2W
10µF
V
V
REF
REF
10µF
R2
200k
–
–
0.002µF
CAP
V
OUT
CAP
V
OUT
+
LT1054 • TA11
200µF
|V
REF
|
|V
|
R2
=
OUT
OUT
1.21V
+
+ 1 =
+ 1 ,
R1
V
V
I
= –5V
= 0mA to 200mA
OUT
OUT
– 40mV
)
)
)
)
2
REFER TO FIGURE 5
Digitally Programmable Negative Supply
15V
+
11
5µF
20k
16
DIGITAL
INPUT
AD558
LT1004-2.5
2.5V
+
FB/SHDN
V
+
14
13
12
20k
CAP
OSC
+
LT1054
GND
10µF
V
REF
LT1054 • TA12
–
CAP
V
OUT
V
OUT
= –V (PROGRAMMED)
IN
100µF
+
1054lfh
12
For more information www.linear.com/LT1054
LT1054/LT1054L
package Description
J8 Package
8-Lead CERDIP (Narrow .300 Inch, Hermetic)
(Reference LTC DWG # 05-08-1110)
.405
(10.287)
MAX
CORNER LEADS OPTION
(4 PLCS)
.005
(0.127)
MIN
6
5
4
8
7
.023 – .045
(0.584 – 1.143)
HALF LEAD
OPTION
.025
.220 – .310
(5.588 – 7.874)
.045 – .068
(0.635)
RAD TYP
(1.143 – 1.650)
FULL LEAD
OPTION
1
2
3
.200
(5.080)
MAX
.300 BSC
(7.62 BSC)
.015 – .060
(0.381 – 1.524)
.008 – .018
(0.203 – 0.457)
0 – 15
.045 – .065
(1.143 – 1.651)
.125
3.175
MIN
NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE
OR TIN PLATE LEADS
.014 – .026
(0.360 – 0.660)
.100
(2.54)
BSC
J8 0801
N Package
8-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510 Rev I)
.400*
(10.160)
MAX
.130 ±.005
.300 – .325
.045 – .065
(3.302 ±0.127)
(1.143 – 1.651)
(7.620 – 8.255)
8
1
7
6
5
.065
(1.651)
TYP
.255 ±.015*
(6.477 ±0.381)
.008 – .015
(0.203 – 0.381)
.120
.020
(0.508)
MIN
(3.048)
MIN
+.035
–.015
2
4
3
.325
.018 ±.003
(0.457 ±0.076)
.100
(2.54)
BSC
+0.889
8.255
N8 REV I 0711
(
)
–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)
1954lfh
13
For more information www.linear.com/LT1054
LT1054/LT1054L
package Description
S8 Package
8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610 Rev G)
.189 – .197
(4.801 – 5.004)
NOTE 3
.045 ±.005
.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
2
3
4
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
SW Package
16-Lead Plastic Small Outline (Wide .300 Inch)
(Reference LTC DWG # 05-08-1620)
.050 BSC .045 .005
.030 .005
TYP
.398 – .413
(10.109 – 10.490)
NOTE 4
15 14
12
10
11
9
N
16
N
13
.325 .005
.420
MIN
.394 – .419
(10.007 – 10.643)
NOTE 3
N/2
8
1
2
3
N/2
RECOMMENDED SOLDER PAD LAYOUT
2
3
5
7
1
4
6
.291 – .299
(7.391 – 7.595)
NOTE 4
.037 – .045
(0.940 – 1.143)
.093 – .104
(2.362 – 2.642)
.010 – .029
¥ 45∞
(0.254 – 0.737)
.005
(0.127)
RAD MIN
0 – 8 TYP
.050
(1.270)
BSC
.004 – .012
.009 – .013
(0.102 – 0.305)
NOTE 3
(0.229 – 0.330)
.014 – .019
.016 – .050
(0.356 – 0.482)
TYP
(0.406 – 1.270)
NOTE:
1. DIMENSIONS IN
INCHES
(MILLIMETERS)
S16 (WIDE) 0502
2. DRAWING NOT TO SCALE
3. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS.
THE PART MAY BE SUPPLIED WITH OR WITHOUT ANY OF THE OPTIONS
4. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
1054lfh
14
For more information www.linear.com/LT1054
LT1054/LT1054L
revision history (Revision history begins at Rev F)
REV
DATE
DESCRIPTION
PAGE NUMBER
F
12/10 The LTC1054MJ8 is now available. Changes reflected throughout the data sheet
1 to 16
G
6/11
9/14
Correct error to part number from LTC7660 to ICL7660
Change Order Information section
1
2
H
1954lfh
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.
15
LT1054/LT1054L
typical applications
Negative Doubler with Regulator
Positive Doubler with Regulation
V
= 5V
IN
V
IN
3.5V TO 15V
+
50k
+
FB/SHDN
V
+
2µF
1N5817
FB/SHDN
V
+
10µF
V
2µF
+
OUT
8V
CAP
OSC
+
CAP
OSC
+
+
+
LT1054
GND
LT1054
GND
50mA
0.03µF
10µF
10µF
V
REF
1N5817
5.5k
V
REF
10k
+
R1, 20k
–
100µF
CAP
V
OUT
–
CAP
V
OUT
R2
1M
5V
100µF
0.002µF
+
10k
–
10k
1N4001
1N4001
–V
LT1006
OUT
2.5k
+
100µF
V
= 3.5V TO 15V
IN
+
V
V
≈ –2V + (V + 2V
)
DIODE
OUT(MAX)
L
IN
L
= LT1054 VOLTAGE LOSS
LT1054 • TA13
|V
REF
|
|V
|
OUT
R2
R1
0.1µF
OUT
=
+ 1 =
+ 1
, REFER TO FIGURE 5
V
1.21V
– 40mV
)
)
LT1054 • TA14
2
THE TYPICAL APPLICATIONS CIRCUITS WERE VERIFIED USING THE STANDARD LT1054. FOR S8 APPLICATIONS
ASSISTANCE IN ANY OF THE UNUSUAL APPLICATIONS CIRCUITS PLEASE CONSULT THE FACTORY
relateD parts
PART NUMBER
DESCRIPTION
COMMENTS
Wide Input Voltage Range: 2V to 18V, I < 8µA, SO8
LTC®1144
Switched-Capacitor Wide Input Range Voltage Converter with
Shutdown
SD
LTC1514/LTC1515
LT1611
Step-Up/Step-Down Switched-Capacitor DC/DC Converters
V : 2V to 10V, V : 3.3V to 5V, I = 60µA, SO8
IN
OUT
Q
150mA Output, 1.4mHz Micropower Inverting Switching Regulator V : 0.9V to 10V, V
:
34V ThinSOTꢁ
IN
OUT
LT1614
250mA Output, 600kHz Micropower Inverting Switching Regulator V : 0.9V to 6V, V
: 30V, I = 1mA, MS8, SO8
OUT Q
IN
LTC1911
250mA, 1.5MHz Inductorless Step-Down DC/DC Converter
V : 2.7V to 5.5V, V : 1.5V/1.8V, I = 180µA, MS8
IN OUT Q
LTC3250/LTC3250-1.2/ Inductorless Step-Down DC/DC Converter
LTC3250-1.5
V : 3.1V to 5.5V, V : 1.2V, 1.5V, I = 35µA, ThinSOT
IN OUT Q
LTC3251
500mA Spread Spectrum Inductorless Step-Down DC/DC Converter V : 2.7V to 5.5V, V : 0.9V to 1.6V, 1.2V, 1.5V, I = 9µA,
IN
MS10E
OUT
Q
LTC3252
Dual 250mA, Spread Spectrum Inductorless Step-Down
DC/DC Converter
V : 2.7V to 5.5V, V : 0.9V to 1.6V, I = 50µA, DFN12
IN OUT Q
1054lfh
LT 0914 REV H • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
16
(408)432-1900 FAX: (408) 434-0507 www.linear.com/LT1054
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LINEAR TECHNOLOGY CORPORATION 2010
相关型号:
LT1054IN8#PBF
LT1054 - Switched-Capacitor Voltage Converter with Regulator; Package: PDIP; Pins: 8; Temperature Range: -40°C to 85°C
Linear
LT1054IN8#TRPBF
IC SWITCHED CAPACITOR REGULATOR, 40 kHz SWITCHING FREQ-MAX, PDIP8, 0.300 INCH, LEAD FRE, PLASTIC, DIP-8, Switching Regulator or Controller
Linear
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