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MAX17000

Complete DDR2 and DDR3 Memory Power-Management Solution

Maxim Integrated 

MAX17000

Complete DDR2 and DDR3 Memory

Power-Management Solution

Table 4. Fault Protection and Shutdown Setting Truth Table

OVP

MODE

REACTION/DRIVER STATE

COMMENT

Shutdown

(SHDN = low)

DL immediately pulled low.

VTTR tracks the SMPS output during soft-shutdown. CSL and VTT

are high impedance at the end of soft-shutdown (16 discharge

MOSFETs disabled).

Outputs high-

impedance in

shutdown.

OVP Disabled

Discharge Disabled

(OVP = Low)

SMPS UVP

SMPS OVP

(disabled)

VTT < -90% or

VTT > +110%

DL immediately pulled low.

VTTR tracks the SMPS output during soft-shutdown. CSL and VTT

are high impedance at the end of soft-shutdown (16 discharge

MOSFETs disabled).

Controller remains active (normal operation).

Note: An OVP detection still pulls PGOOD1 low.

PGOOD2 immediately pulled low.

Soft-shutdown initiated if fault persists for more than 5ms (typ). DH

not used in soft-shutdown. DL low after soft-shutdown completed.

VTTR tracks the SMPS output soft-shutdown.

SMPS latched fault

condition.

Only PGOOD1 pulled

low; fault not latched.

VTT latched fault

condition if fault

persists for more

than 5ms (typ).

DL and DH immediately pulled low.

VCC UVLO PGOOD1 and PGOOD2 immediately forced low. VTT and VTTR

falling edge blocks immediately disabled (high impedance, no 16 discharge

—

on outputs).

Shutdown

(SHDN = low)

Soft-shutdown initiated.

DL high after soft-shutdown completed.

VTTR tracks the SMPS output during soft-shutdown. Internal 16

discharge MOSFETs on CSL and VTT enabled after soft-shutdown.

16
discharge

MOSFETs on CSL

and VTT enabled in

shutdown.

OVP Enabled

Discharge Enabled

(OVP = High)

SMPS UVP

SMPS OVP

(enabled)

Soft-shutdown initiated. DH not used in soft-shutdown. DL low

after soft-shutdown completed.

VTTR tracks the SMPS output during soft-shutdown. Internal 16

discharge MOSFETs on CSL and VTT enabled after soft-shutdown.

DL immediately latched high, DH forced low.

PGOOD1 and PGOOD2 immediately forced low.

VTT and VTTR blocks immediately shut down. Internal 16

discharge MOSFETs on CSL and VTT enabled.

SMPS latched fault

condition.

SMPS latched fault

condition.

VTT < 90% or

VTT > 110%

PGOOD2 immediately pulled low.

Soft-shutdown initiated if fault persists for more than 5ms (typ). DH

not used in soft-shutdown. DL low after soft-shutdown completed.

VTTR tracks the SMPS output during soft-shutdown. Internal 16

discharge MOSFETs on CSL and VTT enabled after soft-shutdown.

VTT latched fault

condition if fault

persists for more

than 5ms (typ).

DL and DH immediately pulled low.

OVP Enabled

Discharge Enabled

(OVP = High)

VCC UVLO

falling edge

PGOOD1 and PGOOD2 immediately forced low.

VTT and VTTR blocks immediately disabled.

Internal 16
discharge MOSFETs on CSL and VTT enabled

—

immediately.

22

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