LTM4620Y 데이터 시트보기 (PDF) - Analog Devices

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LTM4620Y

Dual 13A or Single 26A DC/DC µModule Regulator

Analog Devices 

LTM4620

PIN FUNCTIONS (Recommended to Use Test Points to Monitor Signal Pin Connections.)

PACKAGE ROW AND COLUMN LABELING MAY VARY

AMONG µModule PRODUCTS. REVIEW EACH PACKAGE

LAYOUT CAREFULLY.

VOUT1 (A1-A5, B1-B5, C1-C4): Power Output Pins.

Apply output load between these pins and GND pins.

Recommend placing output decoupling capacitance

directly between these pins and GND pins. Review Table

4. See Note 8 in the Electrical Characteristics section for

output current guideline.

GND (A6-A7, B6-B7, D1-D4, D9-D12, E1-E4, E10-E12,

F1-F3, F10-F12, G1, G3, G10, G12, H1-H7, H9-H12, J1,

J5, J8, J12, K1, K5-K8, K12, L1, L12, M1 , M12): Power

Ground Pins for Both Input and Output Returns.

VOUT2 (A8-A12, B8-B12, C9-C12): Power Output Pins.

Apply output load between these pins and GND pins.

Recommend placing output decoupling capacitance

directly between these pins and GND pins. Review Table 4.

See Note 8 in the Electrical Characteristics section for

output current guideline.

VOUTS1, VOUTS2 (C5, C8): This pin is connected to the top

of the internal top feedback resistor for each output. The

pin can be directly connected to its specific output, or

connected to DIFFOUT when the remote sense amplifier is

used. In paralleling modules, one of the VOUTS pins is con-

nected to the DIFFOUT pin in remote sensing or directly

to VOUT with no remote sensing. It is very important to

connect these pins to either the DIFFOUT or VOUT since

this is the feedback path, and cannot be left open. See the

Applications Information section.

fSET (C6): Frequency Set Pin. A 10µA current is sourced

from this pin. A resistor from this pin to ground sets a

voltage that in turn programs the operating frequency.

Alternatively, this pin can be driven with a DC voltage

that can set the operating frequency. See the Applications

Information section.

SGND (C7, D6, G6-G7, F6-F7): Signal Ground Pin. Return

ground path for all analog and low power circuitry. Tie

a single connection to the output capacitor GND in the

application. See layout guidelines in Figure 22.

VFB1, VFB2 (D5, D7): The Negative Input of the Error

Amplifier for Each Channel. Internally, this pin is con-

nected to VOUTS1 or VOUTS2 with a 60.4kΩ 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 the Applications Information

section for details.

TRACK1, TRACK2 (E5, D8): Output Voltage Tracking Pin

and Soft-Start Inputs. Each channel has a 1.3µA pull-up

current source. When one channel is configured to be

master of the two channels, then a capacitor from this pin

to ground will set a soft-start ramp rate. The remaining

channel can be set up as the slave, and have the master’s

output applied through a voltage divider to the slave out-

put’s track pin. This voltage divider is equal to the slave

output’s feedback divider for coincidental tracking. See

the Applications Information section.

COMP1, COMP2 (E6, E7): Current control threshold and

error amplifier compensation point for each channel. The

current comparator threshold increases with this control

voltage. Tie the COMP pins together for parallel operation.

The device is internal compensated.

DIFFP (E8): Positive input of the remote sense amplifier.

This pin is connected to the remote sense point of the

output voltage. See the Applications Information section.

DIFFN (E9): Negative input of the remote sense amplifier.

This pin is connected to the remote sense point of the

output GND. See the Applications Information section.

MODE_PLLIN (F4): Force Continuous Mode, Burst Mode

Operation, or Pulse-Skipping Mode Selection Pin and

External Synchronization Input to Phase Detector Pin.

Connect this pin to SGND to force both channels into

force continuous mode of operation. Connect to INTVCC

to enable pulse-skipping mode of operation. Leaving the

pin floating will enable Burst Mode operation. A clock on

the pin will force both channels into continuous mode of

operation and synchronized to the external clock applied

to this pin.

Heat Sink (Top Exposed Metal): The top exposed metal

is at ground potential.

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For more information www.linear.com/LTM4620

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