Linear Technology LTC3718 Manual de usuario

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 464

DDR, HSTL, STTL TERMINATION POWER SUPPLY

LTC3718

DESCRIPTION

Demonstration circuit 464 is a termination power supply

that sinks or sources up to 12A current. Typical applica-

tions include termination power supplies for DDR or

QDR memories. DC464 utilizes the LTC3718, a constant

on-time, valley current mode synchronous buck control-

ler with an integrated monolithic boost switcher that

produces 5V bias for driving logic level MOSFETs. The

demo circuit provides additional footprints for paralleling

more MOSFETs and input/output capacitors for higher

current applications. The output voltage (V

OUT

) equals

half of the reference voltage (V

REF

). The default refer-

ence voltage is the input voltage, V

. An external refer-

ence can be provided to program the output voltage di-

rectly.

SPECIFICATIONS

•

2.5V typical, 1.5V–5V

•

OUT

•

OUT

10A continuous,

12A

MAX

with air flow at

100LFM

SETUP NOTES

JUMPER SETTINGS

JP1: BOOST at

position

JP2: VIN2 at

position

EXTERNAL REFERENCE

The output of this demo board can be programmed by

the external reference at the VREF pin.

NOTE:

R4 must be removed before applying V

REF

QUICK START PROCEDURE

Refer to Figure 1 and Figure 2 for proper measurement

equipment setup and follow the procedure below:

Connect the input 2.5V power source to the VIN and

GND pins using wires capable of handling 6A current.

Turn on the input power supply. VOUT should read

about V

0.05V. If V

is fixed at 2.5V, V

OUT

=1.25V

0.05V

SOURCING CURRENT TEST (FIGURE 1)

Turn off the input power supply VIN first.

Connect the load to the VOUT and GND pins with the

positive terminal of the load connecting to VOUT.

Turn on VIN.

Increase the load current to 10A. V

OUT

should always

equal to V

0.05V. If V

is fixed at 2.5V, V

OUT

should read about 1.25V

0.05V.

SINKING CURRENT TEST (FIGURE 2)

Turn off the input power supply VIN first.

Connect the load to the VIN and VOUT pins with the

positive terminal of the load connecting to VIN and

the negative terminal of load connecting to VOUT.

Turn on VIN.

10.

Increase the load current to 10A. If VREF is fixed at

2.5V, VOUT should read about 1.25V

0.05V.

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 464

DDR, HSTL, STTL TERMINATION POWER SUPPLY

–

LOAD

–

+–

OUT

(1.5V–5V)

+–

Figure 1.

Proper Measurement Equipment Setup for Output Sourcing Current

–+

–

+–

LOAD

–

OUT

(1.5V–5V)

+–

Figure 2.

Proper Measurement Equipment Setup for Output Sinking Current

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