LTM4601A View Datasheet(PDF) - Linear Technology

Part Name

Description

MFG CO.

LTM4601A

12A DC/DC µModules with PLL, Output Tracking and Margining

Linear Technology 

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LTM4601A/LTM4601A-1

PIN FUNCTIONS (See Package Description for Pin Assignment)

MARG1 (Pin D12): This pin is the MSB logic input for the

margining function. Together with the MARG0 pin will

determine if margin high, margin low or no margin state

is applied. The pin has an internal pull-down resistor of

50k. See Applications Information.

SGND (Pins H12, H11, G11): Signal Ground. These pins

connect to PGND at output capacitor point. See Figure 15.

COMP (Pin A11): Current Control Threshold and Error

Amplifier Compensation Point. The current comparator

threshold increases with this control voltage. The voltage

ranges from 0V to 2.4V with 0.7V corresponding to zero

sense voltage (zero current).

PGOOD (Pins G12, F11): Output Voltage Power Good

Indicator. Open-drain logic output that is pulled to ground

when the output voltage is not within ±10% of the regula-

tion point, after a 25μs power bad mask timer expires.

RUN (Pin A10): Run Control Pin. A voltage above 1.9V

will turn on the module, and when below 1V, will turn off

the module. A programmable UVLO function can be ac-

complished with a resistor from VIN to this pin that has a

5.1V zener to ground. Maximum pin voltage is 5V. Limit

current into the RUN pin to less than 1mA.

VOUT_LCL (Pin L12): VOUT connects directly to this pin

to bypass the remote sense amplifier, or DIFFVOUT con-

nects to this pin when remote sense amplifier is used.

VOUT_LCL can be connected to VOUT on the LTM4601A-1,

VOUT is internally connected to VOUT_LCL with 50Ω in the

LTM4601A-1.

MTP1, MTP2, MPT3 (Pins C10, D10, D11 ): Extra Mounting

Pads used for increased solder integrity strength. These

pads must remain floating (electrical open circuit).

SIMPLIFIED BLOCK DIAGRAM

VIN

R1

UVLO

FUNCTION

R2

VOUT_LCL

>1.9V = ON

<1V = OFF

MAX = 5V RUN

PGOOD

COMP

RSET

40.2k

SGND

MARG1

MARG0

VFB

fSET

INTERNAL

COMP

39.2k

VOUT

1M

(50Ω, LTM4601A-1)

60.4k

5.1V

ZENER

POWER CONTROL

50k 50k

MPGM

TRACK/SS

CSS

PLLIN

INTVCC

DRVCC

4.7μF

50k

1.5μF

+

VIN

4.5V TO 20V

CIN

Q1

22μF

Q2

VOUT

1.5V

12A

+

COUT

PGND

10k INTVCC

10k

10k

10k

VOSNS–

VOSNS+

DIFFVOUT

NOT INCLUDED

IN THE LTM4601A-1

VVOOSSNNSS–+

=

=

NC1

NC2

DIFFVOUT = NC3

4601A F01

Figure 1. Simplified LTM4601A/LTM4601A-1 Block Diagram

4601afb

8

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