LTC3370 datasheet(12/28 Pages) AD

12 / 28 page

LTC3376

Rev 0

For more information www.analog.com

PIN FUNCTIONS

BSTA (Pin A1): Boost Node for Power Stage A.

BSTB (Pin B2): Boost Node for Power Stage B.

BSTC (Pin G2): Boost Node for Power Stage C.

BSTD (Pin H1): Boost Node for Power Stage D.

BSTE (Pin H8): Boost Node for Power Stage E.

BSTF (Pin G7): Boost Node for Power Stage F.

BSTG (Pin B7): Boost Node for Power Stage G.

BSTH (Pin A8): Boost Node for Power Stage H.

CFG0 (Pin F2): Configuration Input Bit. With CFG1, CFG2

and CFG3, CFG0 configures the Buck output current power

stage combinations. CFG0 should be tied to either INTVCC

or GND. Do not float.

CFG1 (Pin G6): Configuration Input Bit. With CFG0, CFG2,

and CFG3, CFG1 configures the Buck output current power

stage combinations. CFG1 should be tied to either INTVCC

or GND. Do not float.

CFG2 (Pin G4): Configuration Input Bit. With CFG0, CFG1,

and CFG3, CFG2 configures the Buck output current power

stage combinations. CFG2 should be tied to either INTVCC

or GND. Do not float.

CFG3 (Pin F7): Configuration Input Bit. With CFG0, CFG1

and CFG2, CFG3 configures the Buck output current power

stage combinations. CFG3 should be tied to either INTVCC

or GND. Do not float.

EXTVCC (Pin C2): External VCC Low Voltage Supply. The

internal LDO regulator draws current from EXTVCC instead

of from VCC when EXTVCC is tied to a voltage higher than

3V. For output voltages of 3.3V and above this pin can be

tied to that VOUT. If this pin is tied to a supply other than a

buck output, use a 4.7µF local bypass capacitor on this pin.

EXTVCC should be tied to ground if not used. Do not float.

FB1+ (Pin D4): Positive Feedback Pin for Buck Regulator 1.

Receives feedback by a resistor divider connected across

the output.

FB2+ (Pin E4): Positive Feedback Pin for Buck Regulator 2.

Receives feedback by a resistor divider connected across

the output.

FB3+ (Pin E5): Positive Feedback Pin for Buck Regulator 3.

Receives feedback by a resistor divider connected across

the output.

FB4+ (Pin D5): Positive Feedback Pin for Buck Regulator 4.

Receives feedback by a resistor divider connected across

the output.

FB1– (Pin C3): Negative Feedback Pin for Buck Regulator 1.

Connect directly to the GND side of the feedback resistor

divider that connects across the output.

FB2– (Pin F3): Negative Feedback Pin for Buck Regulator 2.

Connect directly to the GND side of the feedback resistor

divider that connects across the output.

FB3– (Pin F6): Negative Feedback Pin for Buck Regulator 3.

Connect directly to the GND side of the feedback resistor

divider that connects across the output.

FB4– (Pin C6): Negative Feedback Pin for Buck Regulator 4.

Connect directly to the GND side of the feedback resistor

divider that connects across the output.

GND (Pin B5): LTC3376 Ground Pin. Connect this pin

to system ground and to the ground plane. Do not float.

IMON1 (Pin D3): Current Monitor Pin for Buck Regulator 1.

IMON1 outputs a current of 100µA (typical) at 1.5A load

current for each power stage configured. Connect a

resistor from IMON1 to GND. The value of this resistor

should be chosen so that IMON1 is 1V at full load (1.5A

per power stage). The IMON1 voltage will decrease by

0.67V/A at lower load currents. The IMON1 output current

will be 0 when the regulator is sleeping in Burst Mode or

is disabled.

IMON2 (Pin E3): Current Monitor Pin for Buck Regulator 2.

IMON2 outputs a current of 100µA (typical) at 1.5A load

current for each power stage configured. Connect a

resistor from IMON2 to GND. The value of this resistor

should be chosen so that IMON2 is 1V at full load (1.5A

per power stage). The IMON2 voltage will decrease by

0.67V/A at lower load currents. The IMON2 output current

will be 0 when the regulator is sleeping in Burst Mode or

is disabled.

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