LTC3124 datasheet(7/28 Pages) LINER

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LTC3124

3124f

For more information www.linear.com/LTC3124

TYPICAL PERFORMANCE CHARACTERISTICS

Output Voltage Ripple at 1.5A

Load with Two 10µF Ceramic

Capacitors

SWA and SWB at 1MHz/Phase

SW Pins while Synchronizing

to 1.2MHz

Short-Circuit Response

PIN FUNCTIONS

SWB, SWA (Pin 1, Pin 3): Phase B and Phase A Switch

Pins. Connect inductors from these pins to the input sup-

ply. Keep PCB trace lengths as short and wide as possible

to reduce EMI and voltage overshoot. When VOUT ≥ VIN +

2V, internal anti-ringing resistors are connected between

VIN and both SWA and SWB after their respective induc-

tor currents have dropped to near zero, to minimize EMI.

Theseanti-ringingresistorsarealsoactivatedinshutdown

and during the sleep periods of Burst Mode operation.

PGNDB, PGNDA, PGND (Pin 2, Pin 4, Exposed Pad

Pin 17):PowerGround.WhenlayingoutyourPCB,provide

a short, direct path between PGND and the output capaci-

tors and tie directly to the ground plane.

The exposed pad

is ground and must be soldered to the PCB ground plane

for rated thermal and electrical performance.

VIN (Pin 5): Input Supply Pin. The device is powered from

VIN if VIN is initially greater than approximately 3.5V, with

VINcontinuingtosupplythedevicedowntoapproximately

3V; otherwise the greater of VIN and VOUT supplies the

Configured as front page application at TA = 25°C, unless otherwise specified.

VOUT

5V/DIV

INDUCTOR B

CURRENT

2A/DIV

INDUCTOR A

CURRENT

2A/DIV

100µs/DIV

ILOAD = 500mA

3124 G28

SHORT-CIRCUIT

APPLIED

SHORT-CIRCUIT

REMOVED

VSWA

5V/DIV

VSWB

5V/DIV

500ns/DIV

ILOAD = 1500mA

3124 G29

INDUCTOR B

CURRENT

500mA/DIV

INDUCTOR A

CURRENT

500mA/DIV

VOUT

20mV/DIV

AC-COUPLED

500ns/DIV

3124 G31

VSWA

5V/DIV

VSWB

5V/DIV

500ns/DIV

ILOAD = 1500mA

3124 G30

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