LTM4656 datasheet(6/28 Pages) AD

6 / 28 page

LTM4656/LTM4656-1

Rev. 0

For more information www.analog.com

TYPICAL PERFORMANCE CHARACTERISTICS

5V to 12V Boost HOT Plugged

Start-Up Into 3.5A Load,

12V to 24V Boost HOT Plugged

Start-Up Into 4A Load

24V to 36V Boost HOT Plugged

Start-Up Into 5A Load

PIN FUNCTIONS

VIN (A9–A12, B9–B12, C9–C12, D10–D12): Power Input

Pins to Protection Path. Apply main input voltage between

these pins and GND pins. Recommend placing minimum

1µF input decoupling capacitance directly between VIN

pins and GND pins.

BVIN(A1–A4,B1–B4,C1–C4,D1–D3):BoostPowerInput

Pins. Recommend placing input decoupling capacitance

directly between BVIN pins and GND pins.

VOUT (J1–J6, K1–K6, L1–L6, M1–M6): Power Output

Pins. Apply output load between these pins and GND

pins. Recommend placing output decoupling capacitance

directly between these pins and GND pins.

GND (A5–A6, B5–B6, C5–C6, D4–D9, E1–E7, E9–E12,

F2–F5, F10–F12, G1–G3, G5, G7–G8, G10–G12, H1,

H8–H12, J7–J11, K7–K11, L7–L12, M7–M12): Ground

Pins for the Input and Output Capacitors and Small Signal

Component Connection.

SW (J12, K12): Switching node that is used for testing

purposes.

MODE_PLLIN (G6): External Synchronization Input to

Phase Detector and Mode Operation Input. When an ex-

ternal clock is applied to this pin, it will force the converter

into forced continuous mode of operation and the phase-

locked loop will force the rising boost switch signal to be

synchronized with the rising edge of the external clock.

When not synchronizing to an external clock, this input

determineshowtheLTM4656operatesatlightloads.Pull-

ing this pin to ground selects Burst Mode operation. An

internal 100k resistor to ground also invokes Burst Mode

operation when the pin is floated. Tying this pin to less

than INTVCC–1.3V selects pulse-skipping operation.

This can be done by adding a 100k resistor between the

MODE_PLLIN pin and INTVCC. Forced continuous opera-

tion can be selected by tying this pin to INTVCC.

FREQ (H6): The Frequency Control Pin for the Internal

VCO. Connecting the pin to GND forces the VCO to a fixed

low frequency of 350kHz. Connecting the pin to INTVCC

forces the VCO to a fixed high frequency of 535kHz. The

frequency can be programmed from 300kHz to 780kHz

by connecting a resistor from the FREQ pin to GND. The

resistor and an internal 20µA source current create a volt-

age used by the internal oscillator to set the frequency.

Alternatively, this pin can be driven with a DC voltage to

vary the frequency of the internal oscillator. See Typical

Applications section.

SS (F7): Output Soft-Start Input. A capacitor to ground

at this pin sets the ramp rate of the output voltage during

start-up.

VFB (E8): The Negative Input of the Error Amplifier for

Each Channel. Internally, this pin is connected to VOUT

with a 221k precision resistor. Different output voltages

can be programmed with an additional resistor between

VFB and GND pins. In PolyPhase® operation, tying the VFB

pins together allows for parallel operation. See Typical

Applications section for details.

COMP(F6):CurrentControlThresholdandErrorAmplifier

Compensation Point for the Regulator. The current com-

parator threshold increases with this control voltage. Tie

5ms/DIV

VIN

5V/DIV

VOUT

10V/DIV

IIN

5A/DIV

TIMER PIN

0.5V/DIV

4656 G10

5ms/DIV

VIN

5V/DIV

VOUT

10V/DIV

IIN

5A/DIV

TIMER PIN

0.5V/DIV

4656 G11

5ms/DIV

4656 G12

VIN

5V/DIV

VOUT

10V/DIV

IIN

5A/DIV

TIMER PIN

0.5V/DIV

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