LT1054/LT1054L
Switched-Capacitor Voltage
Converter with Regulator
FEATURES
s
s
DESCRIPTIO
s
s
s
s
s
s
s
Available in Space Saving SO-8 Package
Output Current: 100mA (LT1054)
125mA (LT1054L)
Low Loss: 1.1V at 100mA
Operating Range:3.5V to 15V (LT1054)
3.5V to 7V (LT1054L)
Reference and Error Amplifier for Regulation
External Shutdown
External Oscillator Synchronization
Can Be Paralleled
Pin Compatible with the LTC
®
1044/LTC7660
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.
The LT1054 also provides regulation, a feature not previ-
ously available in switched-capacitor voltage converters.
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.
The internal oscillator of the LT1054 runs at a nominal
frequency of 25kHz. The oscillator pin can be used to adjust
the switching frequency or to externally synchronize the
LT1054.
The LT1054 is pin compatible with previous converters
such the LTC1044/LTC7660.
APPLICATI
s
s
s
s
S
Voltage Inverter
Voltage Regulator
Negative Voltage Doubler
Positive Voltage Doubler
, LTC and LT are registered trademarks of Linear Technology Corporation.
BLOCK DIAGRAM
V
REF
6
2.5V
R
V
IN
8
2
REFERENCE
DRIVE
VOLTAGE LOSS (V)
+
1
FEEDBACK/
SHUTDOWN
CAP
+
2
+
–
OSC
R
7
OSC
Q
Q
CAP
–
4
DRIVE
DRIVE
3 GND
*EXTERNAL CAPACITORS
C
IN
*
1
+
C
OUT
*
5 –V
OUT
DRIVE
LT1054 • BD
0
U
LT1054/LT1054L Voltage Loss
3.5V
≤
V
IN
≤
15V (LT1054)
3.5V
≤
V
IN
≤
7V (LT1054L)
C
IN
= C
OUT
= 100µF
INDICATES GUARANTEED
TEST POINT
LT1054
LT1054L
T
J
= 125°C
T
J
= 25°C
T
J
= –55°C
0
25
50
75
100
OUTPUT CURRENT (mA)
125
1054 TA01•
W
UO
1
LT1054/LT1054L
ABSOLUTE
AXI U
RATI GS
Supply Voltage (Note 2)
LT1054 ................................................................ 16V
LT1054L ................................................................ 7V
Input Voltage
Pin 1 ................................................. 0V
≤
V
PIN1
≤
V
+
Pin 3 (S Package) ............................. 0V
≤
V
PIN3
≤
V
+
Pin 7 ............................................. 0V
≤
V
PIN7
≤
V
REF
Pin 13 (S Package) ...................... 0V
≤
V
PIN13
≤
V
REF
Operating Junction Temperature Range
LT1054C/LT1054LC ............................. 0°C to 100°C
LT1054I ........................................... – 40°C to 100°C
LT1054M ......................................... – 55°C to 125°C
PACKAGE/ORDER I FOR ATIO
TOP VIEW
V
+
8
FB/SHDN 1
CAP
+
2
GND 3
CASE
IS
V
OUT
4
7 OSC
6 V
REF
5 V
OUT
ORDER PART
NUMBER
LT1054CH
LT1054MH
CAP
–
H PACKAGE
8-LEAD TO-5 METAL CAN
T
JMAX
= 150°C,
θ
JA
= 150°C,
θ
JC
= 45°C/W
TOP VIEW
FB/SHDN 1
CAP
+
2
GND 3
CAP
–
4
J8 PACKAGE
8-LEAD CERAMIC DIP
8
7
6
5
V
+
OSC
V
REF
V
OUT
FO T R
R EC
EW O M
DE ME
SI D
G ED
S
ORDER PART
NUMBER
LT1054CJ8
LT1054CN8
LT1054IN8
LT1054MJ8
O
N8 PACKAGE
8-LEAD PLASTIC DIP
T
JMAX
= 150°C,
θ
JA
= 100°C/ W (J8)
T
JMAX
= 125°C,
θ
JA
= 130°C/ W (N8)
2
U
U
W
W W
U
W
(Note 1)
Maximum Junction Temperature (Note 3)
LT1054C/LT1054LC ........................................ 125°C
LT1054I ............................................................ 125°C
LT1054M ......................................................... 150°C
Storage Temperature Range
H, J8, N8 and S8 Packages ................ –55°C to 150°C
S Package ........................................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
(Note 6)
TOP VIEW
FB/SHDN 1
CAP
+
2
GND 3
CAP
–
4
8
7
6
5
V
+
OSC
V
REF
V
OUT
ORDER PART
NUMBER
LT1054CS8
LT1054LCS8
S8 PART
MARKING
1054
1054L
ORDER PART
NUMBER
LT1054CSW
LT1054ISW
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 125°C,
θ
JA
= 120°C/W
SEE REGULATION AND CAPACITOR SELECTION SECTIONS
IN THE APPLICATIONS INFORMATION FOR IMPORTANT
INFORMATION ON THE S8 DEVICE
TOP VIEW
NC 1
NC 2
16 NC
15 NC
14 V
+
U
U
W
W
FB/SHDN 3
CAP
+
4
GND 5
CAP
–
6
13 OSC
12 V
REF
11 V
OUT
10 NC
9
NC
U
NC 7
NC 8
U
SW PACKAGE
16-LEAD PLASTIC SO
T
JMAX
= 125°C,
θ
JA
= 150°C/W
LT1054/LT1054L
ELECTRICAL CHARACTERISTICS
PARAMETER
Supply Current
CONDITIONS
I
LOAD
= 0mA
(Note 7)
MIN
V
IN
= 3.5V
V
IN
= 15V
LT1054L: V
IN
= 3.5V
V
IN
= 7V
LT1054:
q
q
q
q
q
q
q
q
q
q
q
q
q
TYP
2.5
3.0
2.5
3.0
Supply Voltage Range
Voltage Loss (V
IN
–
V
OUT
)
Output Resistance
Oscillator Frequency
Reference Voltage
Regulated Voltage
Line Regulation
Load Regulation
Maximum Switch Current
Supply Current in Shutdown
LT1054
LT1054L
C
IN
= C
OUT
= 100µF Tantalum (Note 4)
I
OUT
= 10mA
I
OUT
= 100mA
I
OUT
= 125mA (LT1054L)
∆I
OUT
= 10mA to 100mA (Note 5)
LT1054: 3.5V
≤
V
IN
≤
15V
LT1054L: 3.5V
≤
V
IN
≤
7V
I
REF
= 60µA, T
J
= 25°C
V
IN
= 7V, T
J
= 25°C, R
L
= 500Ω (Note 6)
LT1054: 7V
≤
V
IN
≤
12V, R
L
= 500Ω (Note 6)
V
IN
= 7V, 100Ω
≤
R
L
≤
500Ω (Note 6)
V
PIN1
= 0V
3.5
3.5
0.35
1.10
1.35
10
25
25
2.50
– 5.00
5
10
300
100
MAX
4.0
5.0
4.0
5.0
15
7
0.55
1.60
1.75
15
35
35
2.65
2.75
– 5.20
25
50
200
UNITS
mA
mA
mA
mA
V
V
V
V
V
Ω
kHz
kHz
V
V
V
mV
mV
mA
µA
15
15
2.35
2.25
– 4.70
q
q
q
The
q
denotes specifications which apply over the full operating
temperature range.
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2:
The absolute maximum supply voltage rating of 16V is for
unregulated circuits using LT1054. For regulation mode circuits using
LT1054 with V
OUT
≤
15V at Pin 5 (Pin 11 on S package), this rating may
be increased to 20V. The absolute maximum supply voltage for LT1054L
is 7V.
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.
Note 5:
Output resistance is defined as the slope of the curve, (∆V
OUT
vs
∆I
OUT
), for output currents of 10mA to 100mA. This represents the linear
portion of the curve. The incremental slope of the curve will be higher at
currents < 10mA due to the characteristics of the switch transistors.
Note 6:
All regulation specifications are for a device connected as a
positive-to-negative converter/regulator with R1 = 20k, R2 = 102.5k,
C1 = 0.002µF, (C1 = 0.05µF S package) C
IN
= 10µF tantalum,
C
OUT
= 100µF tantalum.
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.
3
LT1054/LT1054L
TYPICAL PERFOR A CE CHARACTERISTICS
Shutdown Threshold
0.6
0.5
SHUTDOWN THRESHOLD (V)
SUPPLY CURRENT (mA)
V
PIN1
0.4
0.3
0.2
0.1
0
– 50 – 25
3
FREQUENCY (kHz)
50
25
75
0
TEMPERATURE (˚C)
Supply Current in Shutdown
120
AVERAGE INPUT CURRENT (mA)
140
120
100
QUIESCENT CURRENT (µA)
80
60
40
20
0
80
60
40
20
0
0
20
60
80
40
OUTPUT CURRENT (mA)
100
VOLTAGE LOSS (V)
V
PIN1
= 0V
0
10
5
INPUT VOLTAGE (V)
Output Voltage Loss
INVERTER CONFIGURATION
C
IN
= 10µF TANTALUM
C
OUT
= 100µF TANTALUM
2
VOLTAGE LOSS (V)
I
OUT
= 100mA
VOLTAGE LOSS (V)
1
0
1
10
OSCILLATOR FREQUENCY (kHz)
100
4
U W
100
LT1054 • TPC01
Supply Current
5
I
L
= 0
4
35
Oscillator Frequency
25
V
IN
= 3.5V
V
IN
= 15V
2
1
0
125
0
10
5
INPUT VOLTAGE (V)
15
LT1054 • TPC02
15
–70 –50 –25 0
25 50 75
TEMPERATURE (°C)
100 125
LT1054 • TPC03
Average Input Current
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
Output Voltage Loss
I
OUT
= 100mA
100
I
OUT
= 50mA
I
OUT
= 10mA
INVERTER CONFIGURATION
C
OUT
= 100µF TANTALUM
f
OSC
= 25kHz
0 10 20 30 40 50 60 70 80 90 100
INPUT CAPACITANCE (µF)
LT1054 • TPC06
15
LT1054 • TPC04
LT1050 • TPC05
Output Voltage Loss
INVERTER CONFIGURATION
C
IN
= 100µF TANTALUM
C
OUT
= 100µF TANTALUM
2
I
OUT
= 100mA
1
I
OUT
= 50mA
I
OUT
= 10mA
0
1
10
OSCILLATOR FREQUENCY (kHz)
100
I
OUT
= 50mA
I
OUT
= 10mA
LT1054 • TPC07
LT1054 • TPC08
LT1054/LT1054L
TYPICAL PERFOR A CE CHARACTERISTICS
Regulated Output Voltage
–4.7
100
–4.9
REFERENCE VOLTAGE CHANGE (mV)
–4.8
OUTPUT VOLTAGE (V)
–5.0
–5.1
–11.6
–11.8
–12.0
–12.2
–12.4
–12.6
–50 –25
50
25
0
75
TEMPERATURE (°C)
100
125
PIN FUNCTIONS
FB/SHDN (Pin 1):
Feedback/Shutdown Pin. This pin has
two functions. Pulling Pin 1 below the shutdown threshold
(≈ 0.45V) puts the device into shutdown. In shutdown the
reference/regulator is turned off and switching stops. The
switches are set such that both C
IN
and C
OUT
are dis-
charged 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 capacitor (C
OUT
) has fully discharged. For most
applications 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 to
start up before the output capacitor (C
OUT
) has fully dis-
charged, 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
p
> 100µs) or a logic high. Diode 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.
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
input capacitor (C
IN
), is alternately driven between V
+
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 alter-
nately between ground the V
OUT
. When driven to ground,
Pin 4 sinks current to ground. When driven to V
OUT
Pin 4
sources current from C
OUT
. In all cases current flow in the
switches is unidirectional as should be expected using
bipolar switches.
V
OUT
(Pin 5):
In addition to being the output pin this pin 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 bias the
substrate diode which will prevent the device from 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 from their V
+
terminals to their V
–
terminals. To prevent start-up prob-
lems with this type of load an external transistor must be
added as shown in Figure 1. This will prevent V
OUT
(Pin 5)
U W
Reference Voltage Temperature
Coefficient
80
60
40
20
0
–20
–40
–60
–80
50
25
0
75
TEMPERATURE (°C)
100
125
V
REF
AT 0 = 2.500V
–100
–50 –25
LT1054 • TPC09
LT1054 • TPC10
U
U
U
5
能源基础设施
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