MAX17000A(2008_10) 查看數據表（PDF） - Maxim Integrated
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MAX17000A Datasheet PDF : 31 Pages
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Complete DDR2 and DDR3 Memory
Power-Management Solution
Table 3. Operating Mode Truth Table
SHDN STDBY SKIP
OPERATION
1 LH LH
SMPS output ramps up in skip mode with a 1.4ms (typ) ramp time. PGOOD1 is held low until the
X
SMPS output is in regulation.
VTT and VTTR ramp up to the final voltage based on VCSL/2 or VREFIN. PGOOD2 is held low until
VTT is in regulation.
2 LH
L
3
H LH
4
H
H
5
H
H
6
H
L
7
H
L
8 HL H
9 HL
L
10 L
X
SMPS output ramps up in skip mode with a 1.4ms ramp time. PGOOD1 is held low until the SMPS
X
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 VCSL/2 or VREFIN.
Standby mode is exited and the full current capability of the MAX17000A is available.
X
VTT ramps up after the internal SMPS block is ready. VTT ramps to the final voltage based on
VCSL/2 or VREFIN.
PGOOD2 goes high when VTT is in regulation.
SMPS is in forced-PWM mode.
H
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.
L
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.
H
VTT is off and is in high impedance.
PGOOD2 is forced low.
VTTR is active and regulates to VCSL/2 or VREFIN.
SMPS is in skip mode.
L VTT is off and is high impedance.
PGOOD2 is forced low.
VTTR is active and regulates to VCSL/2 or VREFIN.
X
Skip mode is exited as the MAX17000A ramps the output down to zero.
VTTR tracks VCSL/2 or VREFIN during shutdown. After the SMPS output reaches 25mV, DL goes low.
Skip mode is exited as the MAX17000A ramps the output down to zero.
X VTTR tracks VCSL/2 or VREFIN during shutdown. After the SMPS output reaches 25mV, DL goes
low. VTT is not enabled throughout soft-shutdown.
X
DL low. Internal16 discharge MOSFETs on CSL and VTT enabled if OVP is high, but disabled if
OVP is low.
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