LTM4601A datasheet(8/28 Pages) LINER

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LTM4601A/LTM4601A-1

4601afb

Figure 1. Simpliﬁed LTM4601A/LTM4601A-1 Block Diagram

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).

(See Package Description for Pin Assignment)

PIN FUNCTIONS

SIMPLIFIED BLOCK DIAGRAM

INTERNAL

COMP

SGND

COMP

PGOOD

RUN

VOUT_LCL

VIN

>1.9V = ON

<1V = OFF

MAX = 5V

MARG1

MARG0

MPGM

PLLIN

CSS

INTVCC

DRVCC

TRACK/SS

VFB

fSET

50k

39.2k

RSET

40.2k

50k

60.4k

VOUT

(50Ω, LTM4601A-1)

5.1V

ZENER

POWER CONTROL

VIN

4.5V TO 20V

VOUT

1.5V

12A

10k

NOT INCLUDED

IN THE LTM4601A-1

VOSNS

– = NC1

VOSNS

+ = NC2

DIFFVOUT = NC3

50k

10k

INTVCC

22μF

1.5μF

CIN

COUT

PGND

VOSNS

–

VOSNS

DIFFVOUT

4601A F01

4.7μF

UVLO

FUNCTION

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