Details, datasheet, quote on part number: LTC1143.F13
PartLTC1143.F13
Category
DescriptionDual High Efficiency SO-16Step-Down Switching Regulator Controllers
CompanyLinear Technology Corporation
DatasheetDownload LTC1143.F13 datasheet
  

 

Features, Applications

LTC1143/LTC1143L LTC1143L-ADJ Dual High Efficiency SO-16 Step-Down Switching Regulator Controllers DESCRIPTION

The LTC1143 series is a dual step-down switching regulator controller featuring automatic Burst ModeTM operation to maintain high efficiencies at low output currents. This device is composed of two separate regulator blocks, each driving an external power MOSFET at switching frequencies to 400kHz using a constant off-time current mode architecture. Both fixed and adjustable voltages are available. The operating current level for both regulators is userprogrammable via an external current sense resistor. Wide input supply range allows operation from 14V (16V maximum). The LTC1143L and LTC1143L-ADJ extend operation to VIN 3.5V. 100% duty cycle provides low dropout regulation limited only by the RDS(ON) of the external MOSFET and resistance of the inductor and current sense resistor. The LTC1143 series is ideal for applications requiring dual output voltages with high conversion efficiencies over a wide load current range in a small amount of board space.

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

FEATURES

Dual Outputs 5V LTC1143L-ADJ: Dual Adjustable Very High Efficiency: Over 95% Possible Current Mode Operation for Excellent Line and Load Transient Response High Efficiency Maintained over Three Decades of Output Current Low Standby Current at Light Loads: 160µA/Output Logic-Controlled Shutdown (LTC1143, LTC1143L) Wide VIN Range: (LTC1143L, LTC1143L-ADJ) Very Low Dropout Operation: 100% Duty Cycle Available in Narrow 16-Pin SO Package

Personal Digital Assistants Notebook and Palmtop Computers Battery-Operated Digital Devices Portable Instruments DC Power Distribution Systems

Input Supply Voltage (Pins to ­0.3V Continuous Output Current (Pins 4,12)................ 50mA Sense Voltages (Pins VIN ­ 0.3V VIN < 12.7V.............................. (VIN ­ 0.3V Shutdown Voltage (LTC1143, LTC1143L, Pins ­ 0.3V VFB Current (LTC1143L-ADJ, Pins 10)............... 1mA Operating Temperature Range Ambient.................................................. to 70°C Extended Commercial (Note to 85°C Junction Temperature (Note 1)............................. 125°C Storage Temperature Range.................. to 150°C Lead Temperature (Soldering, 10 sec).................. 300°C

Consult factory for Industrial and Military grade parts.

SYMBOL PARAMETER I2, I10 VOUT Feedback Voltage (LTC1143L-ADJ) Feedback Current (LTC1143L-ADJ) Regulated Output Voltage (LTC1143/LTC1143L) 3.3V Output 5V Output Voltage Line Regulation Output Voltage Load Regulation LTC1143/LTC1143L 3.3V Output 5V Output Ripple (Burst Mode) I5, I13 Input DC Supply Current (Note 2) LTC1143: Normal Mode Sleep Mode Shutdown LTC1143L: Normal Mode Sleep Mode Shutdown LTC1143L-ADJ: Normal Mode Sleep Mode VIN = 9V

= 0V ILOAD = 700mA ILOAD = 700mA VIN to 12V, ILOAD 5mA < ILOAD 5mA < ILOAD < 2.0A ILOAD 4V < VIN 4V < VIN 3.5V < VIN 3.5V < VIN 3.5V < VIN 3.5V < VIN < 12V, VOUT 3.3V

SYMBOL to V9 PARAMETER Current Sense Threshold Voltage LTC1143/LTC1143L CONDITIONS = 0V VSENSE ­ = VOUT + 100mV (Forced) VSENSE ­ = VOUT ­ 100mV (Forced) VSENSE­ = 5V, VFB = VOUT + 25mV (Forced) VSENSE­ = 5V, VFB = VOUT ­ 25mV (Forced)

I6, I14 tOFF tr, tf Shutdown Pin Threshold LTC1143/LTC1143L Shutdown Pin Input Current LTC1143/LTC1143L CT Pin Discharge Current Off-Time (Note 3) Driver Output Transition Times

0V < VSHUTDOWN = 16V VOUT in Regulation, VSENSE- = VOUT = 390pF, ILOAD = 3000pF (Pins 4, 12), VIN 50 4

V2, V10 VOUT Feedback Voltage (LTC1143L-ADJ) Regulated Output Voltage LTC1143/LTC1143L 3.3V Output 5V Output Input DC Supply Current (Note 2) LTC1143: Normal Mode Sleep Mode Shutdown LTC1143L: Normal Mode Sleep Mode Shutdown LTC1143L-ADJ: Normal Mode Sleep Mode Current Sense Threshold Voltage LTC1143/LTC1143L VIN = 9V ILOAD = 700mA ILOAD 4V < VIN 4V < VIN 3.5V < VIN 3.5V < VIN 3.5V < VIN 3.5V < VIN < 12V, VOUT = 0V VSENSE ­ = VOUT + 100mV (Forced) VSENSE ­ = VOUT ­ 100mV (Forced) VSENSE­ = 5V, VFB = VOUT + 25mV (Forced) VSENSE­ = 5V, VFB = VOUT ­ 25mV (Forced) 1.30 V

The q denotes specifications which apply over the specified temperature range. Note TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formula: LTC1143 series: TA + (PD 125°C/W) Note 2: This supply current is for one regulator block. Total supply current is the sum of Pin 5 and Pin 13 currents. Dynamic supply current

is higher due to the gate charge being delivered at the switching frequency. See Applications Information. Note 3: In applications where RSENSE is placed at ground potential, the off-time increases approximately 40%. Note 4: The LTC1143 series is guaranteed to meet specified performance from to 70°C and is designed, characterized and expected to meet these extended temperature limits, but is not tested to 85°C.


 

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