Datasheet

ManualsBrandsLINEAR TECHNOLOGY ManualsPMICsPMIC - DC/DC voltage regulator Switched-capacitor voltage converter SOIC 8

LT1054/LT1054L

1054lfe

DESCRIPTIO

FEATURES

APPLICATIO S

BLOCK DIAGRA

Switched-Capacitor Voltage

Converter with Regulator

■

Available in Space Saving SO-8 Package

■

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

■

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.

OUTPUT CURRENT (mA)

VOLTAGE LOSS (V)

1054 TA01•

75 100 125

= 125°C

= 25°C

= –55°C

LT1054

LT1054L

3.5V ≤ V

≤ 15V (LT1054)

3.5V ≤ V

≤ 7V (LT1054L)

= C

OUT

= 100µF

INDICATES GUARANTEED

TEST POINT

, LTC and LT are registered trademarks of Linear Technology Corporation.

LT1054/LT1054L Voltage Loss

REFERENCE

OSC

DRIVE DRIVE

DRIVE

OSC

CAP

–

GND

CAP

FEEDBACK/

SHUTDOWN

–

*EXTERNAL CAPACITORS

2.5V

–V

OUT

LT1054 • BD

REF

OUT

■

Voltage Inverter

■

Voltage Regulator

■

Negative Voltage Doubler

■

Positive Voltage Doubler

Summary of content (16 pages)

PAGE 1
LT1054/LT1054L Switched-Capacitor Voltage Converter with Regulator U FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ DESCRIPTIO 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.
PAGE 2
LT1054/LT1054L W W W AXI U U ABSOLUTE RATI GS (Note 1) Supply Voltage (Note 2) LT1054 ................................................................ 16V LT1054L ................................................................ 7V Input Voltage Pin 1 ................................................. 0V ≤ VPIN1 ≤ V+ Pin 3 (S Package) ............................. 0V ≤ VPIN3 ≤ V+ Pin 7 ............................................. 0V ≤ VPIN7 ≤ VREF Pin 13 (S Package) ......................
PAGE 3
LT1054/LT1054L ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 7) PARAMETER Supply Current Supply Voltage Range Voltage Loss (VIN – VOUT) Output Resistance Oscillator Frequency Reference Voltage CONDITIONS ILOAD = 0mA MIN LT1054: VIN = 3.5V VIN = 15V LT1054L: VIN = 3.
PAGE 4
LT1054/LT1054L U W TYPICAL PERFOR A CE CHARACTERISTICS Shutdown Threshold Supply Current Oscillator Frequency 35 5 0.6 0.5 0.4 0.3 0.2 FREQUENCY (kHz) 4 VPIN1 SUPPLY CURRENT (mA) SHUTDOWN THRESHOLD (V) IL = 0 3 2 0 – 50 – 25 0 50 25 75 0 TEMPERATURE (˚C) 100 125 0 10 5 INPUT VOLTAGE (V) 15 –70 –50 –25 0 25 50 75 TEMPERATURE (°C) 15 LT1054 • TPC02 LT1054 • TPC01 Supply Current in Shutdown Average Input Current Output Voltage Loss 1.4 100 120 1.2 100 1.
PAGE 5
LT1054/LT1054L U W TYPICAL PERFOR A CE CHARACTERISTICS Reference Voltage Temperature Coefficient Regulated Output Voltage 100 –4.8 80 REFERENCE VOLTAGE CHANGE (mV) –4.7 OUTPUT VOLTAGE (V) –4.9 –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 LT1054 • TPC09 VREF AT 0 = 2.500V 60 40 20 0 –20 –40 –60 –80 –100 –50 –25 50 25 0 75 TEMPERATURE (°C) 100 125 LT1054 • TPC10 U U U PIN FUNCTIONS FB/SHDN (Pin 1): Feedback/Shutdown Pin.
PAGE 6
LT1054/LT1054L U U U PIN FUNCTIONS from being pulled above the ground pin (Pin 3) during start-up. Any small, general purpose transistor such as 2N2222 or 2N2219 can be used. RX 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.
PAGE 7
LT1054/LT1054L U U U PIN FUNCTIONS the oscillator frequency. During the time that CIN is charging, the peak supply current will be approximately equal to 2.2 times the output current. During the time that CIN is delivering charge to COUT the supply current drops 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.
PAGE 8
LT1054/LT1054L U U W U APPLICATIONS INFORMATION R3 VIN FB/SHDN R4 CIN 10µF TANTALUM + OSC CAP + LT1054 GND VREF CAP – R1 R2 VOUT C1 RESTART SHUTDOWN ) )) ) |VOUT| |VOUT| R2 = +1 ≈ +1 1.21V VREF R1 – 40mV 2 WHERE VREF = 2.5V NOMINAL VOUT FOR EXAMPLE: TO GET VOUT = –5V REFERRED TO THE GROUND PIN OF THE LT1054, CHOOSE R1 = 20k, THEN ) +2.2µF V+ + COUT 100µF TANTALUM LT1054 • F05 ) |–5V| + 1 = 102.6k* 2.5V – 40mV 2 *CHOOSE THE CLOSEST 1% VALUE R2 = 20k voltage.
PAGE 9
LT1054/LT1054L U U W U APPLICATIONS INFORMATION where dV = peak-to-peak ripple and f = oscillator frequency. For output capacitors with significant ESR a second term must be added to account for the voltage step at the switch transitions. This step is approximately equal to: 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 ratings.
PAGE 10
LT1054/LT1054L U TYPICAL APPLICATIONS N Basic Voltage Inverter 100µF FB/SHDN OSC CAP + LT1054 GND VREF 2µF CAP – –VOUT 100µF OSC CAP + LT1054 GND VREF + VOUT V+ 10µF R2 CAP – ) + LT1054 • TAO2 R1 VOUT 0.002µF )) ) |VOUT| |VOUT| R2 = +1 = +1 , 1.
PAGE 11
LT1054/LT1054L U TYPICAL APPLICATIONS N Bipolar Supply Doubler VIN 3.5V TO 15V + + + 10µF 100µF +VOUT FB/SHDN V + – OSC CAP + LT1054 GND VREF + 10µF CAP – + 100µF VOUT + 10µF – 100µF VIN = 3.
PAGE 12
LT1054/LT1054L U TYPICAL APPLICATIONS N 3.5V to 5V Regulator 20k 1 1N914 2 + 1N914 OSC CAP + LT1054 GND VREF + 10µF CAP – 1µF + R1 20k 5µF R2 125k 0.002µF VOUT + R2 125k 7 LTC1044 3 6 4 5 + FB/SHDN V + 1N914 8 100µF 1µF 3k + VIN 3.5V TO 5.5V VOUT = 5V – VIN = 3.5V TO 5.
PAGE 13
LT1054/LT1054L U PACKAGE DESCRIPTION J8 Package 8-Lead CERDIP (Narrow .300 Inch, Hermetic) (Reference LTC DWG # 05-08-1110) CORNER LEADS OPTION (4 PLCS) .023 – .045 (0.584 – 1.143) HALF LEAD OPTION .045 – .068 (1.143 – 1.650) FULL LEAD OPTION .005 (0.127) MIN .405 (10.287) MAX 8 7 6 5 .025 (0.635) RAD TYP .220 – .310 (5.588 – 7.874) 1 .300 BSC (7.62 BSC) 2 3 4 .200 (5.080) MAX .015 – .060 (0.381 – 1.524) .008 – .018 (0.203 – 0.
PAGE 14
LT1054/LT1054L U PACKAGE DESCRIPTION N8 Package 8-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510) .400* (10.160) MAX 8 7 6 5 1 2 3 4 .255 ± .015* (6.477 ± 0.381) .300 – .325 (7.620 – 8.255) .065 (1.651) TYP .008 – .015 (0.203 – 0.381) ( +.035 .325 –.015 8.255 +0.889 –0.381 .130 ± .005 (3.302 ± 0.127) .045 – .065 (1.143 – 1.651) ) .120 (3.048) .020 MIN (0.508) MIN .018 ± .003 .100 (2.54) BSC (0.457 ± 0.076) N8 1002 NOTE: 1.
PAGE 15
LT1054/LT1054L U PACKAGE DESCRIPTION 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 16 N 15 14 13 12 11 10 9 N .325 ±.005 .420 MIN .394 – .419 (10.007 – 10.643) NOTE 3 1 2 3 N/2 N/2 RECOMMENDED SOLDER PAD LAYOUT 1 .005 (0.127) RAD MIN .009 – .013 (0.229 – 0.330) .291 – .299 (7.391 – 7.595) NOTE 4 .010 – .029 × 45° (0.254 – 0.737) 3 4 5 6 7 .093 – .104 (2.362 – 2.
PAGE 16
LT1054/LT1054L U TYPICAL APPLICATIONS N Negative Doubler with Regulator Positive Doubler with Regulation VIN 3.5V TO 15V VIN = 5V + VOUT 8V 50mA 10µF + + 5.5k 10k CAP 5V – – 2µF OSC CAP LT1054 GND VREF + OSC CAP LT1054 GND VREF 10k + + + 1N5817 0.03µF 100µF FB/SHDN V + 2µF FB/SHDN V + 10µF CAP – + VOUT 10µF R1, 20k VOUT + 50k 1N5817 1N4001 10k R2 1M 100µF 0.002µF 1N4001 –VOUT + VIN = 3.