Details, datasheet, quote on part number: LTC1148CS-5
PartLTC1148CS-5
Category
DescriptionHigh Efficiency Synchronous Step-down Switching Regulators
CompanyLinear Technology Corporation
DatasheetDownload LTC1148CS-5 datasheet
Cross ref.Similar parts: ADP1148AR-5, TL2842, TL2842B, TL2843, TL2843B, TL2843B-Q1, TL2844, TL2844B, TL2845, TL2845B
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Features, Applications
LTC1148 LTC1148-3.3/LTC1148-5 High Efficiency Synchronous Step-Down Switching Regulators FEATURES

Ultrahigh Efficiency: Over 95% Possible Current-Mode Operation for Excellent Line and Load Transient Response High Efficiency Maintained Over Three Decades of Output Current Low 160A Standby Current at Light Loads Logic Controlled Micropower Shutdown: < 20A Wide VIN Range: to 20V Short-Circuit Protection Very Low Dropout Operation: 100% Duty Cycle Synchronous FET Switching for High Efficiency Adaptive Nonoverlap Gate Drives Output Can Be Externally Held High in Shutdown Available in 14-Pin Narrow SO Package

The LTC1148 series is a family of synchronous stepdown 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 providing constant ripple current in the inductor. The operating current level is user-programmable via an external current sense resistor. Wide input supply range allows operation from 18V (20V maximum). Constant off-time architecture provides low dropout regulation limited by only the RDS(ON) of the external MOSFET and resistance of the inductor and current sense resistor. The LTC1148 series combines synchronous switching for maximum efficiency at high currents with an automatic low current operating mode, called Burst Mode operation, which reduces switching losses. Standby power is reduced to only 2mW at VIN = 10V (at IOUT = 0). Load currents in Burst Mode operation are typically to 300mA. For operation to 48V input, see the LTC1149 and LTC1159 data sheets and Application Note 54.

, LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode is a trademark of Linear Technology Corporation. * LTC1148L and LTC1148L-3.3 only.

Notebook and Palmtop Computers Portable Instruments Battery-Operated Digital Devices Cellular Telephones DC Power Distribution Systems GPS Systems

1F VIN P-DRIVE LTC1148HV-5 SHUTDOWN SENSE + ITH SENSE CT N-DRIVE SGND PGND
TOP VIEW P-DRIVE NC VIN CT INTVCC ITH SENSE N-DRIVE NC 12 PGND 11 SGND 10 SHUTDOWN 9 8 VFB* SENSE +

Input Supply Voltage (Pin 3) LTC1148 and LTC1148L Series............ 0.3V LTC1148HV Series............................... 0.3V Continuous Output Current (Pins 14).............. 50mA Sense Voltages (Pins 8) LTC1148HV (Adjustable Only) VIN 0.3V VIN < 12.7V......................... (VIN 0.3V Operating Ambient Temperature Range...... to 70C Extended Commercial and Industrial Temperature Range............................... to 85C Junction Temperature (Note 2)............................ 125C Storage Temperature Range................ to 150C Lead Temperature (Soldering, 10 sec)................. 300C

SYMBOL V9 I9 VOUT PARAMETER Feedback Voltage LTC1148L, LTC1148HV) Feedback Current LTC1148L, LTC1148HV)

Regulated Output Voltage VIN LTC1148HV-3.3, LTC1148L-3.3 ILOAD LTC1148-5, LTC1148HV-5 ILOAD = 700mA Output Voltage Line Regulation VIN to 12V, ILOAD = 50mA Output Voltage Load Regulation 5mA < ILOAD 5mA < ILOAD < 2A Output Ripple (Burst Mode) ILOAD = 0A

Input DC Supply Current (Note 3) LTC1148 Series Normal Mode Sleep Mode Sleep Mode (LTC1148-5) Shutdown LTC1148HV Series Normal Mode Sleep Mode Sleep Mode (LTC1148HV-5) Shutdown LTC1148L Series Normal Mode Sleep Mode Shutdown

SYMBOL V7 PARAMETER Current Sense Threshold Voltage I10 I4 tOFF tR, tF Shutdown Pin Threshold Shutdown Pin Input Current CT Pin Discharge Current Off Time (Note 5) Driver Output Transition Times

CONDITIONS VSENSE + 25mV (Forced) VSENSE 25mV (Forced) VSENSE = VOUT + 100mV (Forced) VSENSE = VOUT 100mV (Forced) VSENSE = VOUT + 100mV (Forced) VSENSE = VOUT 100mV (Forced) 0V < VSHUTDOWN < 8V, VIN = 16V VOUT in Regulation, VSENSE = VOUT = 390pF, ILOAD = 3000pF (Pins 1, 14), VIN 50 4 MIN TYP MAX UNITS s ns

SYMBOL V9 VOUT PARAMETER Feedback Voltage LTC1148HV LTC1148L) Regulated Output Voltage LTC1148-5, LTC1148HV-5 Input DC Supply Current (Note 3) LTC1148 Series Normal Mode Sleep Mode Sleep Mode Shutdown LTC1148HV Series Normal Mode Sleep Mode Sleep Mode Shutdown LTC1148L Series Normal Mode Sleep Mode Shutdown Current Sense Threshold Voltage LTC1148HV, LTC1148L (Note 4) CONDITIONS VIN = 9V VIN = 9V ILOAD = 700mA ILOAD = 700mA (Note 4V < VIN 4V < VIN 6V < VIN < 12V VSHUTDOWN 4V < VIN 4V < VIN 4V < VIN 6V < VIN < 18V VSHUTDOWN 4V < VIN 3.5V < VIN 3.5V < VIN < 12V VSHUTDOWN 3.5V < VIN < 12V VSENSE 25mV (Forced) VSENSE + 25mV (Forced) V s MIN 1.20 TYP 1.25 MAX 1.30 UNITS V

LTC1148HV-3.3, LTC1148L-3.3 VSENSE = VOUT + 100mV (Forced) VSENSE = VOUT 100mV (Forced) LTC1148HV-5 V10 tOFF Shutdown Pin Threshold Off Time (Note = 390pF, ILOAD = 700mA VSENSE = VOUT + 100mV (Forced) VSENSE = VOUT 100mV (Forced)


 

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