Details, datasheet, quote on part number: LTC1159CN-5
PartLTC1159CN-5
CategoryPower Management and Supplies => IC Voltage Regulators => IC Switching Voltage Regulators => 6921058
Title0.05 A SWITCHING CONTROLLER, 250 kHz SWITCHING FREQ-MAX, PDSO20
Description
CompanyLinear Technology Corporation
DatasheetDownload LTC1159CN-5 datasheet
Cross ref.Similar parts: UC1846, UC1846-SP, UC2856, UCC1806, UCC1806-SP, UCC2806, UCC2810, UCC3806, UCC3806M, UCC3810
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Specifications 
Configuration / FunctionPUSH-PULL
Package TypeSSOP, Other, 5.30 MM, PLASTIC, SSOP-20
Life Cycle StageACTIVE
IOUT0.0500 amps
VIN12 volts
fsw250 kHz
Operating Temperature0 to 70 C (32 to 158 F)

 

Features, Applications
LTC1159 LTC1159-3.3/LTC1159-5 High Efficiency Synchronous Step-Down Switching Regulators
FEATURES

Operation from to 40V Input Voltage Ultrahigh Efficiency: 95% 20A Supply Current in Shutdown High Efficiency Maintained Over Wide Current Range Current Mode Operation for Excellent Line and Load Transient Response Very Low Dropout Operation: 100% Duty Cycle Short-Circuit Protection Synchronous FET Switching for High Efficiency Adaptive Non-Overlap Gate Drives Available in SSOP and SO Packages

The LTC1159 series is a family of synchronous step-down switching regulator controllers featuring automatic Burst ModeTM operation to maintain high efficiencies at low output currents. These devices drive external complementary power MOSFETs at switching frequencies to 250kHz using a constant off-time current-mode architecture. A separate pin and on-board switch allow the MOSFET driver power to be derived from the regulated output voltage providing significant efficiency improvement when operating at high input voltages. The constant off-time current-mode architecture maintains constant ripple current in the inductor and provides excellent line and load transient response. The output current level is user programmable via an external current sense resistor. The LTC1159 automatically switches to power saving Burst Mode operation when load current drops below approximately 15% of maximum current. Standby current is only 300A while still regulating the output and shutdown current is a low 20A.

, LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode is a trademark of Linear Technology Corporation.

Step-Down and Inverting Regulators Notebook and Palmtop Computers Portable Instruments Battery-Operated Digital Devices Industrial Power Distribution Avionics Systems Telecom Power Supplies

1N4148 P-GATE 0.1F P-DRIVE EXTVCC 0V = NORMAL >2V = SHUTDOWN SHDN1 SHDN2 ITH CT S-GND SENSE + SENSE N-GATE P-GND

Input Supply Voltage (Pin to 60V VCC Output Current (Pin 3).................................. 50mA Continuous Pin Currents (Any Pin)...................... 50mA Sense Voltages......................................... to 13V Shutdown Voltages................................................... 7V EXTVCC Input Voltage............................................. 15V Junction Temperature (Note 2)............................ 125C

TOP VIEW P-GATE VIN VCC P-DRIVE VCC CT ITH CAP SHDN2 18 EXTVCC 17 PGND 16 N-GATE 15 PGND 14 SGND SHDN1 12 VFB 11 SENSE +

Consult LTC Marketing for parts specified with wider operating temperature ranges.

The q denotes specifications which apply over the full operating temperature range, otherwise specifications are = 25C. VIN = 0V (Note 3), unless otherwise noted.

SYMBOL VFB IFB VOUT PARAMETER Feedback Voltage (LTC1159 Only) Feedback Current (LTC1159 Only) Regulated Output Voltage LTC1159-3.3 LTC1159-5 Output Voltage Line Regulation Output Voltage Load Regulation LTC1159-3.3 LTC1159-5 Burst Mode Output Ripple IIN VIN Pin Current (Note 4) Normal Mode Shutdown IEXTVCC EXTVCC Pin Current (Note 4) VIN = 9V ILOAD = 700mA ILOAD = 700mA VIN 5mA < ILOAD 5mA < ILOAD < 2A ILOAD = 0A VIN = 12V, EXTVCC = 5V VIN = 40V, EXTVCC = 5V VIN = 2V VIN = 2V EXTVCC = 5V, Sleep Mode

Operating Temperature Range to 85C Extended Commercial Temperature Range............................... to 85C Storage Temperature Range................ to 150C Lead Temperature (Soldering, 10 sec)................. 300C

TOP VIEW P-GATE VIN VCC P-DRIVE VCC CT ITH SENSE CAP SHDN2 14 EXTVCC 13 N-GATE 12 PGND 11 SGND 10 VFB (SHDN1)* 9 SENSE +

The q denotes specifications which apply over the full operating temperature range, otherwise specifications are = 25C. VIN = 0V (Note 3), unless otherwise noted.

SYMBOL VCC VIN VCC VEXT VCC PARAMETER Internal Regulator Voltage VCC Dropout Voltage EXTVCC Switch Drop CONDITIONS VIN to 40V, EXTVCC = 0V, ICC = 10mA VIN = 4V, EXTVCC = Open, ICC = 10mA VIN = 12V, EXTVCC = 5V, ISWITCH = 10mA VIN = 12V VIN = 40V VSENSE = 5V, VFB = 1.32V (Forced) VSENSE = 5V, VFB = 1.15V (Forced) VSENSE = 3.4V (Forced) VSENSE = 3.1V (Forced) VSENSE = 5.2V (Forced) VSENSE = 4.7V (Forced)

VP-GATE VIN P-Gate to Source Voltage (Off) VSENSE + VSENSE Current Sense Threshold Voltage VSHDN2 ISHDN2 ICT tOFF tr, tf SHDN1 Threshold LTC1159-5 SHDN2 Threshold Shutdown 2 Input Current CT Pin Discharge Current Off-Time (Note 5) Driver Output Transition Times

= 5V VOUT in Regulation VOUT = 390pF, ILOAD = 700mA, VIN = 3000pF (Pins P-Drive and N-Gate), VIN 50 4

SYMBOL VFB VOUT PARAMETER Feedback Voltage (LTC1159 Only) Regulated Output Voltage LTC1159-3.3 LTC1159-5 VIN Pin Current (Note 4) Normal Shutdown IEXTVCC VCC VSENSE + VSENSE VSHDN2 tOFF EXTVCC Pin Current (Note 4) Internal Regulator Voltage Current Sense Threshold Voltage SHDN2 Threshold Off-Time (Note = 390pF, ILOAD = 700mA, VIN = 10V VIN = 9V ILOAD = 700mA ILOAD = 700mA VIN = 12V, EXTVCC = 5V VIN = 40V, EXTVCC = 5V VIN = 2V VIN = 2V EXTVCC = 5V, Sleep Mode VIN to 40V, EXTVCC = 0V, ICC = 10mA Low Threshold (Forced) High Threshold (Forced) CONDITIONS MIN 3.17 4.85 TYP MAX 3.43 5.25 UNITS V s

Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formulas: TA + (PD TA + (PD TA + (PD 110C/W)

Note On LTC1159 versions which have a SHDN1 pin, it must be at ground potential for testing. Note 4: The LTC1159 VIN and EXTVCC current measurements exclude MOSFET driver currents. When VCC power is derived from the output via EXTVCC, the input current increases by (IGATECHG Duty Cycle)/(Efficiency). See Typical Performance Characteristics and Applications Information. Note 5: In applications where RSENSE is placed at ground potential, the offtime increases approximately 40%.


 

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