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LTM4603/LTM4603-1

4603f

PLIFIED BLOCK DIAGRA

Figure 1. Simpliﬁed LTM4603/LTM4603-1 Block Diagram

programmed with an additional resistor between VFB and

SGND pins. See Applications Information.

MARG0 (Pin C12): This pin is the LSB logic input for the

margining function. Together with the MARG1 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.

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 (Pin H12): Signal Ground. This pin connects to

PGND at output capacitor point.

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 (Pin G12): Output Voltage Power Good Indicator.

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

output voltage is not within ±10% of the regulation 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 1.9V, will turn

off the module. A programmable UVLO function can be

accomplished with a resistor from VIN to this pin that has

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

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 LTM4603-1.

VOUT is internally connected to VOUT_LCL through 50Ω in

the LTM4603-1.

PI FU CTIO S (See Package Description for Pin Assignment)

INTERNAL

COMP

SGND

COMP

PGOOD

RUN

VOUT_LCL

>2V = ON

<0.9V = OFF

MAX = 5V

MARG1

MARG0

MPGM

PLLIN

CSS

INTVCC

DRVCC

TRACK/SS

VFB

fSET

50k

33.2k

RFB

40.2k

50k

60.4k

VOUT

5.1V

ZENER

POWER CONTROL

VIN

4.5V TO 28V

VOUT

2.5V

10k

50k

10k

INTVCC

µF

1.5

µF

CIN

COUT

PGND

VOSNS

–

VOSNS

DIFFVOUT

4603 F01

4.7

µF

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