MAX17000A Maxim Integrated Products, MAX17000A Datasheet - Page 15

• Manufacturer Part Number: MAX17000A
• Description: Complete DDR2 and DDR3 Memory Power-Management Solution
• Manufacturer: Maxim Integrated Products

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Table 3. Operating Mode Truth Table
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1
2
3
4
5
6
7
8
9
SHDN
L
L
H
H
H
H
H
H
H
L
H
H
L
L
STDBY
L
L
H
H
H
L
L
L
L
X
______________________________________________________________________________________
H
H
SKIP
H
H
X
X
X
X
X
X
L
L
SMPS output ramps up in skip mode with a 1.4ms (typ) ramp time. PGOOD1 is held low until the
SMPS output is in regulation.
VTT and VTTR ramp up to the final voltage based on V
VTT is in regulation.
SMPS output ramps up in skip mode with a 1.4ms ramp time. PGOOD1 is held low until the SMPS
output is in regulation.
VTT remains off throughout since STDBY is low. PGOOD2 stays low throughout.
VTTR ramps up to the final voltage based on V
Standby mode is exited and the full current capability of the MAX17000A is available.
VTT ramps up after the internal SMPS block is ready. VTT ramps to the final voltage based on
V
PGOOD2 goes high when VTT is in regulation.
SMPS is in forced-PWM mode.
VTT and VTTR are enabled.
PGOOD1 is high when the SMPS output is in regulation.
PGOOD2 is high when VTT is in regulation.
SMPS is in skip mode.
VTT and VTTR are enabled.
PGOOD1 is high when the SMPS output is in regulation.
PGOOD2 is high when VTT is in regulation.
SMPS is in forced-PWM mode.
VTT is off and is in high impedance.
PGOOD2 is forced low.
VTTR is active and regulates to V
SMPS is in skip mode.
VTT is off and is high impedance.
PGOOD2 is forced low.
VTTR is active and regulates to V
Skip mode is exited as the MAX17000A ramps the output down to zero.
VTTR tracks V
Skip mode is exited as the MAX17000A ramps the output down to zero.
VTTR tracks V
low. VTT is not enabled throughout soft-shutdown.
DL low. Internal16
OVP is low.
CSL
Complete DDR2 and DDR3 Memory
/2 or V
REFIN
CSL
CSL
.
/2 or V
/2 or V
Power-Management Solution
discharge MOSFETs on CSL and VTT enabled if OVP is high, but disabled if
REFIN
REFIN
during shutdown. After the SMPS output reaches 25mV, DL goes low.
during shutdown. After the SMPS output reaches 25mV, DL goes
CSL
CSL
/2 or V
/2 or V
OPERATION
REFIN
REFIN
CSL
.
.
/2 or V
CSL
REFIN
/2 or V
.
REFIN
. PGOOD2 is held low until
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