MAX17510ATB(2011) データシートの表示（PDF） - Maxim Integrated

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MAX17510ATB
(Rev.:2011)

Low-Voltage DDR Linear Regulators

Maxim Integrated 

Low-Voltage DDR Linear Regulators

Pin Description

PIN

NAME

FUNCTION

1

REFOUT Buffered Reference Output. The output of the unity-gain reference input buffer sources and sinks over

5mA. Bypass REFOUT to AGND with a 0.33µF or greater ceramic capacitor.

2

VCC

Analog Supply Input. Connect to the system supply voltage (+3.3V). Bypass VCC to AGND with a 1µF or

greater ceramic capacitor.

3

AGND Analog Ground. Connect the backside pad to AGND.

4

REFIN

External Reference Input. REFIN sets the output regulation voltage (VOUTS = VREFIN).

Open-Drain Power-Good Output. PGOOD is low when the output voltage is more than 150mV (typ) above

5

PGOOD or below the regulation point, during soft-start, and when shut down. 2ms after the output reaches the

regulation voltage during startup, PGOOD becomes high impedance.

Output Sense Input. The OUTS regulation level is set by the voltage at REFIN. Connect OUTS to the

6

OUTS

remote DDR termination bypass capacitors. OUTS is internally connected to OUT through a 12kΩ

resistor.

7

SHDN

Shutdown Control Input. Connect to VCC for normal operation. Connect to analog ground to shut down the

linear regulator. The reference buffer remains active in shutdown.

8

PGND Power Ground. Internally connected to the output sink MOSFET.

9

OUT

Output of the Linear Regulator

10

IN

Power Input. Internally connected to the output source MOSFET.

—

EP

Exposed Pad. Internally connected to AGND. Connect EP to AGND PCB ground plane to maximize

thermal performance. Not intended as an electrical connection point.

Detailed Description

The MAX1510/MAX17510 are low-voltage, low-dropout

DDR termination linear regulators with an external bias

supply input and a buffered reference output (see

Figures 1 and 2). VCC is powered by a 2.7V to 3.6V

supply that is commonly available in laptop and desk-

top computers. The 3.3V bias supply drives the gate of

the internal pass transistor, while a lower voltage input

at the drain of the transistor (IN) is regulated to provide

VOUT. By using separate bias and power inputs, the

MAX1510/MAX17510 can drive an n-channel high-side

MOSFET and use a lower input voltage to provide bet-

ter efficiency.

The MAX1510/MAX17510 regulate their output voltage

to the voltage at REFIN. When used in DDR applica-

tions as a termination supply, the MAX1510/MAX17510

deliver 1.25V or 0.9V at 3A peak (typ) from an input

voltage of 1.1V to 3.6V. The MAX1510/MAX17510 sink

up to 3A peak (typ) as required in a termination sup-

ply. The MAX1510/MAX17510 provide shoot-through

protection, ensuring that the source and sink

MOSFETs do not conduct at the same time, yet pro-

duce a fast source-to-sink load transient.

VIN =

1.1V TO 3.6V

CIN2

10μF

3.3V BIAS

SUPPLY

R3

100kΩ

POWER-GOOD

C1

1.0μF

OFF

VDDQ

ON

R1

10kΩ

R2

10kΩ

CREFIN

1000pF

VOUT = VTT = VDDQ/2

IN

OUT

COUT1

100μF

MAX1510

MAX17510

VCC

PGND

AGND

PGOOD

OUTS

SHDN

REFIN

REFOUT

VREFOUT = VTTR

CREFOUT

0.33μF

Figure 1. Standard Application Circuit

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