LTM4607 datasheet(6/26 Pages) AD

6 / 26 page

LTM4712

Rev. 0

For more information www.analog.com

Short-Circuit with 5VIN to 12VOUT,

No Load

Short-Circuit with 12VIN to 12VOUT,

No Load

Short-Circuit with 36VIN to 12VOUT,

No Load

PIN FUNCTIONS

GND (Pins A1-G1, A2-G2, C3-M3, C4-M4, C5-J5, M5,

E6-M6, E7-M7, C8-J8, M8, C9-M9, C10-M10, C11-G11,

A12-G12): Tie these GND pins to a local ground plane

below the LTM4712 and the circuit components. In most

applications, the bulk of the heat flow out of the LTM4712

is through these pads, so the printed circuit design has a

large impact on the thermal performance of the part. See

the PCB Layout and Thermal Considerations and Output

Current Derating sections for more details.

ISP, ISN (Pins A3, A4): Average Current Sensing Pins. The

positive/negative inputs of the internal rail-to-rail average

current sense amplifier.

IMON (Pin A5): Input or Output Current Monitor. This

feature is generally useful only if a current sense resis-

tor is placed on input or output. ISP needs to be con-

nected to the positive side, while ISN on the negative

side. This pin produces a voltage that is proportional to

the voltage across the sense resistor. IMON will equal 1.2V

when VISP – VISN = 50mV.

CLKOUT (Pin A6): Clock Output. Use this pin as a clock

source when synchronizing other devices to the switch-

ing frequency of the LTM4712. When this function is not

used, leave this pin open. See the Applications Information

section for detailed parallel configuration.

FREQ (Pin A7): Frequency Set Pin. A resistor between

this pin and SGND sets the switching frequency. This pin

sources 10μA current.

PGOOD (Pin A8): Power Good Indicator Output for

the Regulated Output Voltage. Open-drain logic out is

pulled down to ground when the regulated output volt-

age exceeds ±10% regulation window with the internal

30μs delay.

PHMODE (Pin A9): Phase Mode Program Pin. This pin

sets the phase relationship between the internal oscilla-

tor clock and the output clock on the CLKOUT pin. Tying

this pin to SGND sets 180° phase shift, floating this pin

sets 120° phase shift and tying this pin to INTVCC sets

90°phase shift. See the Applications Information section

for details.

MODE (Pin A10): Forced Continuous Mode (FCM) and

Pulse-Skipping Mode. Tying this pin to GND enables

FCM operation, otherwise the controller works in the

pulse-skipping mode when MODE pin is floated. Do not

tie to INTVCC or other voltage source. See the Applications

Information section for details.

SS (Pin A11): Soft-Start. Connect a capacitor from this

pin to GND to increase the soft-start time. Soft-start

reduces the input power source’s surge current by gradu-

ally increasing the controller’s current limit. Larger values

of the soft-start capacitor result in longer soft-start times.

See the Applications Information section.

TYPICAL PERFORMANCE CHARACTERISTICS

4712 G16

200 s/DIV

IIN

5A/DIV

VOUT

5V/DIV

fSW = 400kHz

4712 G17

200 s/DIV

IIN

5A/DIV

VOUT

5V/DIV

fSW = 400kHz

4712 G18

200 s/DIV

IIN

5A/DIV

VOUT

5V/DIV

fSW = 400kHz

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