|Category||Power Management => Regulators => Switching Regulators => Step-Down|
|Description||LTC1149, 48V Synchronous Step-down|
|Company||Linear Technology Corporation|
|Datasheet||Download LTC1149 datasheet
|LTC1149 LTC1149-3.3/LTC1149-5 High Efficiency Synchronous Step-Down Switching Regulators FEATURES
Operation to 48V Input Voltage Ultrahigh Efficiency: to 95% Current Mode Operation for Excellent Line and Load Transient Response High Efficiency Maintained over Wide Current Range Logic-Controlled Micropower Shutdown Short-Circuit Protection Very Low Dropout Operation: 100% Duty Cycle Synchronous FET Switching for High Efficiency Adaptive Nonoverlap Gate Drives Available in 16-Pin Narrow SO Package
The LTC ®1149 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. Special onboard regulation and level-shift circuitry allow operation at input voltages from dropout 48V (60V absolute max). The constant off-time architecture maintains constant ripple current in the inductor, easing the design of wide input range converters. Current mode operation provides excellent line and load transient response. The operating current level is user-programmable via an external current sense resistor. The LTC1149 series incorporates automatic power saving Burst Mode operation when load currents drop below the level required for continuous operation. Standby power is reduced to only about 8mW at VIN 12V. In shutdown, both MOSFETs are turned off.
Notebook and Palmtop Computers Portable Instruments Battery-Operated Digital Devices Industrial Power Distribution Avionics Systems Telecom Power Supplies
, LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode is a trademark of Linear Technology Corporation.0V = NORMAL >2V = SHUTDOWN SHDN1 SHDN2 ITH CT SGND SENSE + SENSE NGATE P, RGNDS 1000pF
TOP VIEW PGATE VIN VCC PDRIVE VCC CT ITH SENSE CAP SHDN2 14 RGND 13 NGATE 12 PGND 11 SGND VFB SHDN1* 9 SENSE + S PACKAGE 16-LEAD PLASTIC SO
Input Supply Voltage (Pin to 60V VCC Output Current (Pin 3).................................. 50mA VCC Input Voltage (Pin 5)........................................ 16V Continuous Output Current (Pins 13).............. 50mA Sense Voltages (Pins 8, 9) VIN 0.3V VIN < 12.7V............................. (VCC 0.3V Shutdown Voltages (Pins 15)............................. 7V Operating Temperature Range.................... to 70°C Extended Commercial Temperature Range............................... to 85°C Junction Temperature (Note 1)............................ 125°C Storage Temperature Range................ to 150°C Lead Temperature (Soldering, 10 sec)................. 300°CConsult factory for Industrial and Military grade parts.
SYMBOL V10 I10 VOUT PARAMETER Feedback Voltage (LTC1149 Only) Feedback Current (LTC1149 Only) Regulated Output Voltage LTC1149-3.3 LTC1149-5 Output Voltage Line Regulation Output Voltage Load Regulation LTC1149-3.3 LTC1149-5 Burst Mode Output Ripple I2 Input DC Supply Current (Note 3) Normal Mode Burst Mode Shutdown VCC V3 VIN V1 Internal Regulator Voltage (Sets MOSFET Gate Drive Levels) VCC Dropout Voltage P-Gate to Source Voltage (Off) VIN = 9V
VIN = 9V ILOAD = 700mA ILOAD = 700mA VIN to 48V, ILOAD 5mA < ILOAD 5mA < ILOAD < 2A ILOAD = 0A VIN = 12V VIN = 48V VIN = 12V VIN = 48V VIN = 2V VIN = 2V VIN = 20mA VIN = 10mA VIN = 12V VIN = 48V
SYMBOL V8 PARAMETER Current Sense Threshold Voltage I15 I6 tOFF tr, tf Shutdown 1 Threshold LTC1149-3.3, LTC1149-5 Shutdown 2 Threshold Shutdown 2 Input Current CT Pin Discharge Current Off-Time (Note 4) Driver Output Transition Times = 5VCONDITIONS = 1.32V (Forced) V8 = VOUT = 3.5V (Forced) V8 = VOUT = 5.3V (Forced) V8 = VOUT 100mV
VOUT In Regulation, VSENSE = VOUT = 390pF, ILOAD = 3000pF (Pins 4, 13), VIN = 6V
SYMBOL V10 VOUT PARAMETER Feedback Voltage LTC1149 Only Regulated Output Voltage LTC1149-3.3 LTC1149-5 Input DC Supply Current (Note 3) Normal Mode Burst Mode Shutdown VCC 8 V15 tOFF Internal Regulator Voltage (Sets MOSFET Gate Drive Levels) Current Sense Threshold Voltage Shutdown 2 Threshold Off-Time (Note = 390pF, ILOAD = 700mA, VIN = 10V VIN = 9V ILOAD = 700mA ILOAD = 700mA VIN = 12V VIN = 48V VIN = 12V VIN = 48V VIN = 2V VIN = 2V VIN = 20mA Low Threshold (Forced) High Threshold (Forced) 9.75 CONDITIONS MIN 3.17 4.85 TYP MAX UNITS V µs
The q denotes specifications which apply over the full operating temperature range. Note TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formulas: TA + (PD + (PD)(110°C/W) Note 2: Pin is a shutdown pin on the LTC1149-3.3 and LTC1149-5 fixed output voltage versions and must be at ground potential for testing.
Note 3: Dynamic supply current is higher due to the gate charge being delivered at the switching frequency. The allowable operating frequency may be limited by power dissipation at high input voltages. See Typical Performance Characteristics and Applications Information. Note 4: In applications where RSENSE is placed at ground potential, the offtime increases approximately 40%. Note 5: The LTC1149, LTC1149-3.3, and LTC1149-5 are not tested and not quality assurance sampled 40°C and 85°C. These specifications are guaranteed by design and/or correlation.
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