MAX17000A Maxim Integrated Products, MAX17000A Datasheet - Page 21

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

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Figure 6. MAX17000A Startup/Shutdown Timing with OVP Enabled
Soft-shutdown begins after SHDN goes low, an output
undervoltage fault occurs, or a thermal fault occurs. A
fault on the SMPS (UV fault for more than 200μs (typ)),
or fault on the VTT output that persists for more than
5ms (typ), triggers shutdown of the whole IC. During
soft-shutdown, the output is ramped down to 0V in
2.8ms, reducing negative inductor currents that can
cause negative voltages on the output. At the end of
soft-shutdown, DL is driven low.
SHDN
STDBY
INT_REF
REFOK
SMPS_RUNOK
SMPS OUTPUT
VTT OUTPUT
VTTR OUTPUT
VTT CURRENT LIMIT
PGOOD1
PGOOD2
DL
VTT 16Ω FET
CSL 16Ω FET
______________________________________________________________________________________
160μs
Complete DDR2 and DDR3 Memory
1.4ms
SKIP
Power-Management Solution
When OVP is enabled (OVP = V
discharging MOSFETs on CSL and VTT are enabled
until startup is triggered again by a rising edge of
SHDN. When OVP is disabled (OVP = AGND), the CSL
and VTT internal 16Ω discharging MOSFETs are not
enabled in shutdown.
The MAX17000A provides overvoltage/undervoltage
fault protections for the PWM output. Drive OVP to
enable and disable fault protection as shown in Table 4.
Output Fault Protection
2.8ms
FPWM
CC
), the internal 16Ω
25mV
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