MAX17000 Просмотр технического описания (PDF) - Maxim Integrated

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MAX17000

Complete DDR2 and DDR3 Memory Power-Management Solution

Maxim Integrated 

MAX17000

Complete DDR2 and DDR3 Memory

Power-Management Solution

SHDN

STDBY

INT_REF

REFOK

SMPS_RUNOK

1.4ms

SMPS OUTPUT

VTT OUTPUT

VTTR OUTPUT

VTT CURRENT LIMIT

PGOOD1

PGOOD2

DL

VTT 16Ω FET

CSL 16Ω FET

160μs

SKIP

2.8ms

25mV

FPWM

Figure 6. MAX17000 Startup/Shutdown Timing when OVP Is 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.

When OVP is enabled (OVP = VCC), the internal 16Ω

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.

Output Fault Protection

The MAX17000 provides overvoltage/undervoltage fault

protections for the PWM output. Drive OVP to enable

and disable fault protection as shown in Table 4.

Maxim Integrated

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