MAX17000A datasheet(21/32 Pages) MAXIM

21 / 32 page

Complete DDR2 and DDR3 Memory

Power-Management Solution

______________________________________________________________________________________

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 16

Ω discharging MOSFETs are not

enabled in shutdown.

Output Fault Protection

The MAX17000A provides overvoltage/undervoltage

fault protections for the PWM output. Drive OVP to

enable and disable fault protection as shown in Table 4.

STDBY

INT_REF

SMPS OUTPUT

REFOK

SMPS_RUNOK

PGOOD1

160

μs

SHDN

VTT OUTPUT

VTTR OUTPUT

VTT CURRENT LIMIT

PGOOD2

1.4ms

2.8ms

VTT 16

Ω FET

SKIP

FPWM

CSL 16

Ω FET

25mV

Figure 6. MAX17000A Startup/Shutdown Timing with OVP Enabled

MAX17000A Datasheet(PDF) 21 Page - Maxim Integrated Products

MAX17000A Datasheet(HTML) 21 Page - Maxim Integrated Products

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32

Datasheet Download

Link URL