LT1054 Linear Technology Corporation, LT1054 Datasheet

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LT1054

Manufacturer Part Number
LT1054
Description
Switched-Capacitor Voltage Converter with Regulator
Manufacturer
Linear Technology Corporation
Datasheet

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BLOCK
FEATURE
A
SHUTDOWN
FEEDBACK/
PPLICATI
, LTC and LT are registered trademarks of Linear Technology Corporation.
Voltage Inverter
Voltage Regulator
Negative Voltage Doubler
Positive Voltage Doubler
REFERENCE
Available in Space Saving SO-8 Package
Output Current: 100mA (LT1054)
Low Loss: 1.1V at 100mA
Operating Range:3.5V to 15V (LT1054)
Reference and Error Amplifier for Regulation
External Shutdown
External Oscillator Synchronization
Can Be Paralleled
Pin Compatible with the LTC
V
REF
6
1
*EXTERNAL CAPACITORS
DIAGRAM
R
R
S
+
O
U
125mA (LT1054L)
3.5V to 7V (LT1054L)
S
2.5V
OSC
7
W
OSC
®
1044/LTC7660
DRIVE
Q
Q
DRIVE
CAP
CAP
+
V
8
2
4
IN
+
C
IN
*
DRIVE
DRIVE
3
5
+
D
The LT
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 100 A.
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.
LT1054 • BD
Switched-Capacitor Voltage
GND
–V
C
OUT
OUT
ESCRIPTIO
*
®
Converter with Regulator
1054 is a monolithic, bipolar, switched-capacitor
2
1
0
U
0
3.5V V
3.5V V
C
LT1054/LT1054L Voltage Loss
IN
INDICATES GUARANTEED
TEST POINT
= C
25
OUT
IN
IN
OUTPUT CURRENT (mA)
LT1054/LT1054L
LT1054
= 100 F
15V (LT1054)
7V (LT1054L)
50
75
T
T
T
LT1054L
100
J
J
J
= 125 C
= 25 C
= –55 C
1054 TA01•
125
1

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LT1054 Summary of contents

Page 1

... 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 100 A. The internal oscillator of the LT1054 runs at a nominal frequency of 25kHz ...

Page 2

... LT1054 ................................................................ 16V LT1054L ................................................................ 7V Input Voltage Pin 1 ................................................. 0V V Pin 3 (S Package) ............................. 0V V Pin 7 ............................................. 0V V Pin 13 (S Package) ...................... 0V V Operating Junction Temperature Range LT1054C/LT1054LC ............................. 100 C LT1054I ........................................... – 100 C LT1054M ......................................... – 125 C U PACKAGE/ORDER I FOR ATIO TOP VIEW + V 8 FB/SHDN 1 OSC ...

Page 3

... LT1054. For regulation mode circuits using LT1054 with V 15V at Pin 5 (Pin package), this rating may OUT 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. ...

Page 4

... INVERTER CONFIGURATION C = 100 F TANTALUM 100 F TANTALUM OUT 100mA OUT 50mA OUT I = 10mA OUT 100 OSCILLATOR FREQUENCY (kHz) LT1054 • TPC08 = 15V IN 100 125 75 LT1054 • TPC03 I = 100mA OUT I = 50mA OUT I = 10mA OUT 100 LT1054 • TPC06 ...

Page 5

... 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 ) has fully discharged ...

Page 6

... A. The reference pin will draw 100 A when shorted to ground and will not affect the internal reference/regulator, so that this pin can also be used as a pull-up for LT1054 circuits that require synchro- nization. 6 OSC (Pin 7): Oscillator Pin. This pin can be used to raise or ...

Page 7

... R 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. Even though this simplification doesn’t include finite switch on-resistance and output voltage ripple, it provides an intuitive feel for how the device works ...

Page 8

... It can be seen from the circuit block diagram that the maximum regulated output voltage is limited by the supply voltage. For the basic configuration, ground pin of the LT1054 must be less than the total of the 2 supply voltage minus the voltage loss due to the switches. + ...

Page 9

... 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 R1 used to lower the thermal resistance of the LT1054 pack- R2 age. In some systems there may be some available airflow C1 which will help to lower the thermal resistance ...

Page 10

... Negative Voltage Doubler + FB/SHDN V + CAP OSC + LT1054 V GND V IN REF 100 F – CAP V OUT –3.5V TO –15V (LT1054 VOLTAGE LOSS OUT IN X *SEE FIGURE 3 FB/SHDN CAP + + LT1054 # GND CAP 1N4002 1N4002 1N4002 V = 3.5 TO 15V 100 MAX –2V OUT | ...

Page 11

... U TYPICAL APPLICATIONS +V OUT OUT –V OUT V = LT1054 VOLTAGE LOSS FB/SHDN V + CAP OSC + LT1054 # GND V REF – CAP V OUT 10k INPUT TTL 10k OR CMOS LOW FOR ON 0.022 F 1 1/2 LT1013 200k FB/SHDN CAP + 10 F GND CAP N Bipolar Supply Doubler ...

Page 12

... OUT OUT IN 100 LTC1044 100 F OUT – 1N914 LT1054 • TA10 HP5082-2810 + FB/SHDN V + CAP OSC 10 LT1054 #2 20k 1/2W GND V REF – CAP V OUT LT1054 • TA11 11 DIGITAL AD558 INPUT LT1054 • TA12 ...

Page 13

... HALF LEAD OPTION 0.025 (0.635) RAD TYP – 15 0.045 – 0.068 (1.143 – 1.727) 0.014 – 0.026 (0.360 – 0.660) LT1054/LT1054L REFERENCE PLANE 0.016 – 0.024 (0.406 – 0.610) H8(TO-5) 0.200 PCD 1197 0.405 MAX 6 5 0.220 – 0.310 (5.588 – 7.874) ...

Page 14

... LT1054/LT1054L PACKAGE DESCRIPTION 0.300 – 0.325 (7.620 – 8.255) 0.009 – 0.015 (0.229 – 0.381) +0.035 0.325 –0.015 +0.889 8.255 –0.381 *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm) 0.010 – 0.020 (0.254 – ...

Page 15

... DWG # 05-08-1620 NOTE 1 1 0.093 – 0.104 (2.362 – 2.642) 0 – 8 TYP 0.050 (1.270) TYP 0.014 – 0.019 (0.356 – 0.482) TYP LT1054/LT1054L 0.398 – 0.413* (10.109 – 10.490 0.394 – 0.419 (10.007 – 10.643 ...

Page 16

... LT1006 2.5k + 0.1 F 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 LTC1144 Switched-Capacitor Voltage Converter LTC1514/LTC1515 Step-Up/Step-Down Switched Capacitor DC/DC Converters ...

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