MAX17000 View Datasheet(PDF) - Maxim Integrated

Part Name

Description

MFG CO.

MAX17000

Complete DDR2 and DDR3 Memory Power-Management Solution

Maxim Integrated 

MAX17000

Complete DDR2 and DDR3 Memory

Power-Management Solution

Pin Description

PIN

NAME

FUNCTION

OVP Mode Control. This input selectively enables/disables the SMPS OV protection feature and

output discharge mode. When enabled, the SMPS OV protection feature is enabled. Connect OVP to

1

OVP

the following voltage levels for the desired function:

High (> 2.4V) = Enable SMPS OV protection, and SMPS and VTT discharge FETs.

Low (AGND) = Disable SMPS OV protection, and SMPS and VTT discharge FETs.

Open-Drain Power-Good Output. PGOOD1 is low when the SMPS output voltage is more than 15%

2

PGOOD1

(typ) beyond the normal regulation point, during soft-start, and in shutdown.

After the soft-start circuit has terminated, PGOOD1 becomes high impedance if the SMPS output is

in regulation.

Open-Drain Power-Good Output. PGOOD2 is low when the VTT output voltage is more than 10%

3

PGOOD2

(typ) beyond the normal regulation point, in shutdown, in standby, and during soft-start.

After the SMPS soft-start circuit has terminated, PGOOD2 becomes high impedance if the VTT

output is in regulation.

Standby Control Input. When SHDN is high and STDBY is low, the MAX17000 enters a low-

4

STDBY

quiescent current mode, putting the SMPS in ultra-skip operation and turning off the VTT output

(high-Z). This mode helps save converter power loss in computer standby operation.

When STDBY is high, normal SMPS operation resumes and the VTT output is enabled.

5

VTTS

Sense Pin for Termination Supply Output. Normally connected to the VTT pin to allow accurate

regulation to VCSL/2 or the REFIN voltage.

Termination Reference Buffer Output. VTTR tracks VCSL/2 when REFIN is connected to VCC. VTTR

6

VTTR

tracks VREFIN when a voltage between 0.5V to 1.5V is set at REFIN. Decouple VTTR to AGND with a

0.33μF ceramic capacitor.

7

PGND2 Power Ground for VTT. Connect PGND2 externally to the underside of the exposed pad.

8

VTT

Termination Power-Supply Output. Connect VTT to VTTS to regulate the VTT voltage to the VTTS

regulation setting.

9

VTTI

Termination Power-Supply Input. VTTI is the input power supply to the VTT linear regulator.

Normally connected to the output of the SMPS regulator for DDR applications.

External Reference Input. REFIN sets the feedback regulation voltage (VTTR = VTTS = VREFIN) of

10

REFIN

the MAX17000.

Connect REFIN to VCC to use the internal VCSL/2 divider.

Connect a 0.5V to 1.5V voltage input to set the adjustable output for VTT, VTTS, and VTTR.

Feedback Input for SMPS Output. Connect to VCC for a fixed +1.8V output or to AGND for a fixed

11

FB

+1.5V output. For an adjustable output (1.0V to 2.7V), connect FB to a resistive divider from the

output voltage. FB regulates to +1.0V.

Negative Input of the PWM Output Current-Sense and Supply Input for VTTR. Connect CSL to the

negative side of the output current-sensing resistor or the filtering capacitor if the DC resistance of

12

CSL

the output inductor is utilized for current sensing.

CSL is also the path for the internal 16
discharge MOSFET when VCC UVLO occurs with OVP

enabled.

Positive Input of the PWM Output Current Sense. Connect CSH to the positive side of the output

13

CSH

current-sensing resistor or the filtering capacitor if the DC resistance of the output inductor is

utilized for current sensing.

12

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