LTM4627 データシートの表示（PDF） - Linear Technology

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LTM4627

15A DC/DC µModule Regulator

Linear Technology 

LTM4627

PIN FUNCTIONS

VIN (A1-A6, B1-B6, C1-C6): Power Input Pins. Apply input

voltage between these pins and GND pins. Recommend

placing input decoupling capacitance directly between VIN

pins and GND pins.

VOUT (J1-J10, K1-K11, L1-L11, M1-M11): 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.

GND (B7, B9, C7, C9, D1-D6, D8, E1-E7, E9, F1-F9, G1-G9,

H1-H9): Power Ground Pins for Both Input and Output

Returns.

PGOOD (F11, G12): Output Voltage Power Good Indicator.

Open-drain logic output that is pulled to ground when the

output voltage exceeds a ±10% regulation window. Both

pins are tied together internally.

SGND (G11, H11, H12): 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 17.

MODE_PLLIN (A8): Forced Continuous Mode, Burst Mode

Operation, or Pulse-Skipping Mode Selection Pin and

External Synchronization Input to Phase Detector Pin.

Connect this pin to INTVCC to enable pulse-skipping mode

of operation. Connect to ground to enable forced continuous

mode of operation. Floating this pin will enable Burst Mode

operation. A clock on this pin will enable synchronization

with forced continuous operation. See the Applications

Information section.

fSET (B12): A resistor can be applied from this pin to

ground to set the operating frequency, or a DC voltage

can be applied to set the frequency. See the Applications

Information section.

TRACK/SS (A9): Output Voltage Tracking Pin and Soft-

Start Inputs. The pin has a 1.2µA pull-up current source.

A capacitor from this pin to ground will set a soft-start

ramp rate. In tracking, the regulator output can be tracked

to a different voltage. The different voltage is applied to

a voltage divider then the slave output’s track pin. This

voltage divider is equal to the slave output’s feedback

divider for coincidental tracking. See the Applications

Information section.

VFB (F12): The Negative Input of the Error Amplifier.

Internally, this pin is connected to VOUT_LCL with a

60.4k precision resistor. Different output voltages can

be programmed with an additional resistor between VFB

and ground pins. In PolyPhase® operation, tying the

VFB pins together allows for parallel operation. See the

Applications Information section for details.

COMP (A11): Current Control Threshold and Error Amplifier

Compensation Point. The current comparator threshold

increases with this control voltage. Tie all COMP pins

together for parallel operation. The device is internally

compensated.

RUN: (A10) Run Control Pin. A voltage above 1.4V will turn

on the module. A 5.1V Zener diode to ground is internal

to the module for limiting the voltage on the RUN pin to

5V, and allowing a pull-up resistor to VIN for enabling the

device. Limit current into the RUN pin to ≤ 2mA.

INTVCC: (A7, D9) Internal 5V LDO for Driving the Control

Circuitry and the Power MOSFET Drivers. Both pins are

internally connected. The 5V LDO has a 100mA current limit.

EXTVCC (E12): External power input to an internal control

switch allows an external source greater than 4.7V, but

less than 6V to supply IC power and bypass the internal

INTVCC LDO. EXTVCC must be less than VIN at all times

during power-on and power-off sequences. See the Ap-

plications Information section.

For more information www.linear.com/LTM4627

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