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LT1054

SWITCHED-CAPACITOR VOLTAGE CONVERTERS

WITH REGULATORS

SLVS033F − FEBRUARY 1990 − REVISED NOVEMBER 2004

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

D Output Current . . . 100 mA

D Low Loss . . . 1.1 V at 100 mA

D Operating Range ...3.5 V to 15 V

D Reference and Error Amplifier for

Regulation

D External Shutdown

D External Oscillator Synchronization

D Devices Can Be Paralleled

D Pin-to-Pin Compatible With the

LTC1044/7660

description/ordering information

The LT1054 is a bipolar, switched-capacitor

voltage converter with regulator. It provides higher

output current and significantly lower voltage

losses than previously available converters. An

adaptive-switch drive scheme optimizes

efficiency over a wide range of output currents.

Total voltage drop at 100-mA output current

typically is 1.1 V. This applies to the full

supply-voltage range of 3.5 V to 15 V. Quiescent

current typically is 2.5 mA.

The LT1054 also provides regulation, a feature previously not available in switched-capacitor voltage

converters. By adding an external resistive divider, a regulated output can be obtained. This output is regulated

against changes in both input voltage and output current. The LT1054 also can be shut down by grounding the

feedback terminal. Supply current in shutdown typically is 100 μA.

The internal oscillator of the LT1054 runs at a nominal frequency of 25 kHz. The oscillator terminal can be used

to adjust the switching frequency or to externally synchronize the LT1054.

The LT1054C is characterized for operation over a free-air temperature range of 0°C to 70°C. The LT1054I is

characterized for operation over a free-air temperature range of −40°C to 85°C.

ORDERING INFORMATION

PACKAGE

†

ORDERABLE

PART NUMBER

TOP-SIDE

MARKING

PDIP (P) Tube of 50 LT1054IP LT1054IP

−40°C to 85°C

SOIC (DW)

Tube of 40 LT1054IDW

LT1054I

40 C

85 C

SOIC (DW)

Reel of 2000 LT1054IDWR

LT1054I

PDIP (P) Tube of 50 LT1054CP LT1054CP

0°C to 70°C

SOIC (DW)

Tube of 40 LT1054CDW

LT1054C

SOIC (DW)

Reel of 2000 LT1054CDWR

LT1054C

†

Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are

available at www.ti.com/sc/package.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

DW PACKAGE

(TOP VIEW)

P PACKAGE

(TOP VIEW)

FB/SD

CAP+

GND

CAP−

OSC

REF

OUT

FB/SD

CAP+

GND

CAP−

OSC

REF

OUT

NC − No internal connection

Summary of content (30 pages)

PAGE 1
LT1054 SWITCHED-CAPACITOR VOLTAGE CONVERTERS WITH REGULATORS SLVS033F − FEBRUARY 1990 − REVISED NOVEMBER 2004 D D D D D D D D P PACKAGE (TOP VIEW) Output Current . . . 100 mA Low Loss . . . 1.1 V at 100 mA Operating Range . . . 3.
PAGE 2
LT1054 SWITCHED-CAPACITOR VOLTAGE CONVERTERS WITH REGULATORS SLVS033F − FEBRUARY 1990 − REVISED NOVEMBER 2004 functional block diagram VREF VCC 6 8 2.5 V Ref R Drive + FB/SD OSC 1 CAP + − 7 2 CIN† Q OSC CAP − Q 4 Drive R Drive 3 GND COUT† 5 VOUT Drive † External capacitors Pin numbers shown are for the P package. absolute maximum ratings over operating free-air temperature range (unless otherwise noted)‡ Supply voltage, VCC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . .
PAGE 3
LT1054 SWITCHED-CAPACITOR VOLTAGE CONVERTERS WITH REGULATORS SLVS033F − FEBRUARY 1990 − REVISED NOVEMBER 2004 electrical characteristics over recommended operating conditions (unless otherwise noted) PARAMETER VO Vref TEST CONDITIONS UNIT MIN TYP‡ MAX −4.7 Regulated output voltage VCC = 7 V, TJ = 25°C, RL = 500 Ω, See Note 5 −5 −5.
PAGE 4
LT1054 SWITCHED-CAPACITOR VOLTAGE CONVERTERS WITH REGULATORS SLVS033F − FEBRUARY 1990 − REVISED NOVEMBER 2004 TYPICAL CHARACTERISTICS Table of Graphs FIGURE Shutdown threshold voltage vs Free-air temperature 1 Supply current vs Input voltage 2 Oscillator frequency vs Free-air temperature 3 Supply current in shutdown vs Input voltage 4 Average supply current vs Output current 5 Output voltage loss vs Input capacitance 6 Output voltage loss vs Oscillator frequency (10 μF) 7 Output voltage loss
PAGE 5
LT1054 SWITCHED-CAPACITOR VOLTAGE CONVERTERS WITH REGULATORS SLVS033F − FEBRUARY 1990 − REVISED NOVEMBER 2004 TYPICAL CHARACTERISTICS† SHUTDOWN THRESHOLD VOLTAGE vs FREE-AIR TEMPERATURE SUPPLY CURRENT vs INPUT VOLTAGE 0.6 5 0.5 0.4 I CC − Supply Current − mA Shutdown Threshold Voltage − V IO = 0 V(FB/SD) 0.3 0.2 3 2 1 0.
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LT1054 SWITCHED-CAPACITOR VOLTAGE CONVERTERS WITH REGULATORS SLVS033F − FEBRUARY 1990 − REVISED NOVEMBER 2004 TYPICAL CHARACTERISTICS OUTPUT VOLTAGE LOSS vs INPUT CAPACITANCE 140 1.4 120 1.2 IO = 100 mA 100 Output Voltage Loss − V Average Supply Current − mA AVERAGE SUPPLY CURRENT vs OUTPUT CURRENT 80 60 40 20 1.0 0.8 IO = 50 mA 0.6 IO = 10 mA 0.4 Inverter Configuration COUT = 100-μF Tantalum fOSC = 25 kHz 0.2 0 0 20 40 60 80 0 100 0 10 Figure 5 2.
PAGE 7
LT1054 SWITCHED-CAPACITOR VOLTAGE CONVERTERS WITH REGULATORS SLVS033F − FEBRUARY 1990 − REVISED NOVEMBER 2004 TYPICAL CHARACTERISTICS† REFERENCE VOLTAGE CHANGE vs FREE-AIR TEMPERATURE −4.7 100 −4.8 80 ΔV ref − Reference Voltage Change − mV VO − Regulated Output Voltage − V REGULATED OUTPUT VOLTAGE vs FREE-AIR TEMPERATURE −4.9 −5 −5.1 −11.6 −11.8 −12 −12.2 −12.4 −12.6 −50 −25 0 25 75 50 60 40 20 0 −20 VREF at 0 = 2.
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LT1054 SWITCHED-CAPACITOR VOLTAGE CONVERTERS WITH REGULATORS SLVS033F − FEBRUARY 1990 − REVISED NOVEMBER 2004 PRINCIPLES OF OPERATION A review of a basic switched-capacitor building block is helpful in understanding the operation of the LT1054. When the switch shown in Figure 12 is in the left position, capacitor C1 charges to the voltage at V1. The total charge on C1 is q1 = C1V1. When the switch is moved to the right, C1 is discharged to the voltage at V2.
PAGE 9
LT1054 SWITCHED-CAPACITOR VOLTAGE CONVERTERS WITH REGULATORS SLVS033F − FEBRUARY 1990 − REVISED NOVEMBER 2004 PRINCIPLES OF OPERATION Supply voltage VCC alternately charges CIN to the input voltage when CIN is switched in parallel with the input supply and then transfers charge to COUT when CIN is switched in parallel with COUT. Switching occurs at the oscillator frequency. During the time that CIN is charging, the peak supply current is approximately 2.2 times the output current.
PAGE 10
LT1054 SWITCHED-CAPACITOR VOLTAGE CONVERTERS WITH REGULATORS SLVS033F − FEBRUARY 1990 − REVISED NOVEMBER 2004 PRINCIPLES OF OPERATION The voltage reference (Vref) output provides a 2.5-V reference point for use in LT1054-based regulator circuits. The temperature coefficient (TC) of the reference voltage has been adjusted so that the TC of the regulated output voltage is near zero. As seen in the typical performance curves, this requires the reference output to have a positive TC.
PAGE 11
LT1054 SWITCHED-CAPACITOR VOLTAGE CONVERTERS WITH REGULATORS SLVS033F − FEBRUARY 1990 − REVISED NOVEMBER 2004 APPLICATION INFORMATION regulation The feedback/shutdown (FB/SD) terminal has two functions. Pulling FB/SD below the shutdown threshold (≈ 0.45 V) puts the device into shutdown. In shutdown, the reference/regulator is turned off and switching stops. The switches are set such that both CIN and COUT are discharged through the output load. Quiescent current in shutdown drops to approximately 100 μA.
PAGE 12
LT1054 SWITCHED-CAPACITOR VOLTAGE CONVERTERS WITH REGULATORS SLVS033F − FEBRUARY 1990 − REVISED NOVEMBER 2004 APPLICATION INFORMATION regulation (continued) The error amplifier of the LT1054 drives the pnp switch to control the voltage across the input capacitor (CIN), which determines the output voltage. When the reference and error amplifier of the LT1054 are used, an external resistive divider is all that is needed to set the regulated output voltage.
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LT1054 SWITCHED-CAPACITOR VOLTAGE CONVERTERS WITH REGULATORS SLVS033F − FEBRUARY 1990 − REVISED NOVEMBER 2004 APPLICATION INFORMATION power dissipation The power dissipation of any LT1054 circuit must be limited so that the junction temperature of the device does not exceed the maximum junction-temperature ratings. The total power dissipation is calculated from two components–the power loss due to voltage drops in the switches, and the power loss due to drive-current losses.
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LT1054 SWITCHED-CAPACITOR VOLTAGE CONVERTERS WITH REGULATORS SLVS033F − FEBRUARY 1990 − REVISED NOVEMBER 2004 APPLICATION INFORMATION power dissipation (continued) At RθJA of 130°C/W for a commercial plastic device, a junction temperature rise of 122°C occurs. The device exceeds the maximum junction temperature at an ambient temperature of 25°C. To calculate the power dissipation with an external resistor (RX), determine how much voltage can be dropped across RX.
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LT1054 SWITCHED-CAPACITOR VOLTAGE CONVERTERS WITH REGULATORS SLVS033F − FEBRUARY 1990 − REVISED NOVEMBER 2004 APPLICATION INFORMATION 1 FB/SD 2 VCC CAP+ OSC 8 VIN + 2 μF 7 LT1054 10 μF 3 + 4 GND VREF CAP− VOUT 6 5 −VOUT 100 μF + Pin numbers shown are for the P package. Figure 19. Basic Voltage Inverter 1 FB/SD VCC 2 CAP+ OSC LT1054 10 μF 3 + 4 GND VREF CAP− VOUT 8 + 7 6 R1 20 kΩ 5 R2 VOUT 0.
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LT1054 SWITCHED-CAPACITOR VOLTAGE CONVERTERS WITH REGULATORS SLVS033F − FEBRUARY 1990 − REVISED NOVEMBER 2004 APPLICATION INFORMATION 1 2 10 μF FB/SD VCC CAP+ OSC + 8 + VOUT 7 − LT1054 3 VIN 2 μF + 4 GND VREF CAP− VOUT 6 QX 5 RX 100 μF + VIN = −3.5 V to −15 V VOUT = 2 VIN + (LT1054 Voltage Loss) + (QX Saturation Voltage) VIN Pin numbers shown are for the P package. Figure 21. Negative-Voltage Doubler VIN 3.
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LT1054 SWITCHED-CAPACITOR VOLTAGE CONVERTERS WITH REGULATORS SLVS033F − FEBRUARY 1990 − REVISED NOVEMBER 2004 APPLICATION INFORMATION VIN 3.5 V to 15 V + 2.2 μF 1 2 + 10 μF 10 μF FB/SD VCC 7 CAP+ LT1054 #1 6 GND VREF 4 5 CAP− 1N4002 VOUT + + 10 μF 100 μF 4 + 0.
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LT1054 SWITCHED-CAPACITOR VOLTAGE CONVERTERS WITH REGULATORS SLVS033F − FEBRUARY 1990 − REVISED NOVEMBER 2004 APPLICATION INFORMATION VI 3.5 V to 15 V 1N4001 1N4001 + + +VO 100 μF 10 μF − + 1 2 10 μF 3 + 4 10 μF FB/SD VCC CAP+ OSC LT1054 GND VREF CAP− VOUT 8 7 6 100 μF + 5 + 1N4001 1N4001 − VI = 3.5 V to 15 V +VO ≈ 2 VIN − (VL + 2 VDiode) −VO ≈ −2 VI + (VL + 2 VDiode) VL = LT1054 Voltage Loss 1N4001 + 100 μF −VO + Pin numbers shown are for the P package. Figure 24.
PAGE 19
LT1054 SWITCHED-CAPACITOR VOLTAGE CONVERTERS WITH REGULATORS SLVS033F − FEBRUARY 1990 − REVISED NOVEMBER 2004 APPLICATION INFORMATION 5V 10 kΩ Input TTL or CMOS Low for On + 10 kΩ 40 Ω 2N2907 8 0.
PAGE 20
LT1054 SWITCHED-CAPACITOR VOLTAGE CONVERTERS WITH REGULATORS SLVS033F − FEBRUARY 1990 − REVISED NOVEMBER 2004 APPLICATION INFORMATION VI 3.5 V to 5.5 V 1 20 kΩ 2 1 μF 1N914 (All) 1 2 10 μF FB/SD VCC CAP+ OSC 3 4 GND VREF VOUT CAP− 3 8 7 LT1054 + + 6 5 4 5 μF FB/SD VCC CAP+ OSC ǒ R2 + R1 ŤVOUT Ť GND VREF CAP− VOUT + V REF 2 * 40 mV Ǔ ǒŤ + R1 V OUT Ť 1.21 V Ǔ )1 5 R1 20 kΩ + 0.002 μF R2 125 kΩ 1N5817 Pin numbers shown are for the P package. Figure 27. 3.
PAGE 21
LT1054 SWITCHED-CAPACITOR VOLTAGE CONVERTERS WITH REGULATORS SLVS033F − FEBRUARY 1990 − REVISED NOVEMBER 2004 APPLICATION INFORMATION 12 V 5 μF + 1 FB/SD 2 10 Ω 1/2 W VCC OSC CAP+ LT1054 #1 3 VREF GND 4 VOUT CAP− + 10 μF 1 8 10 Ω 1/2 W 7 R1 39.2 kΩ 6 + 0.002 μF 5 10 μF VCC CAP+ OSC 8 HP5082-2810 7 LT1054 #2 3 VREF GND 6 20 kΩ + 4 R2 200 kΩ + 2 FB/SD ǒ 200 μF R2 + R1 ŤV OUT Ť V REF 2 * 40 mV VOUT CAP− Ǔ ǒŤ )1 + R1 V OUT Ť 1.
PAGE 22
LT1054 SWITCHED-CAPACITOR VOLTAGE CONVERTERS WITH REGULATORS SLVS033F − FEBRUARY 1990 − REVISED NOVEMBER 2004 APPLICATION INFORMATION VI = 5 V 50 kΩ 1 1N5817 100 μF 10 μF + 1N5817 VO 8V + 0.03 μF 8 VCC CAP+ OSC 2 10 kΩ 10 kΩ 7 LT1054 3 6 5.5 kΩ 5V 10 kΩ FB/SD GND VREF CAP− VOUT 4 5 − 1/2 LT1013 + 2.5 kΩ 0.1 μF Pin numbers shown are for the P package. Figure 30. Positive Doubler With Regulation (5-V to 8-V Converter) VI 3.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 18-Sep-2007 Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties.
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PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant LT1054CDWR SOIC DW 16 2000 330.0 16.4 10.75 10.7 2.7 12.0 16.0 Q1 LT1054IDWR SOIC DW 16 2000 330.0 16.4 10.75 10.7 2.7 12.0 16.
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PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LT1054CDWR SOIC DW 16 2000 367.0 367.0 38.0 LT1054IDWR SOIC DW 16 2000 367.0 367.0 38.
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