2

USING THE EVALUATION BOARD

1) Powering up the SP6659 Circuit

The SP6659 Evaluation Board can be powered from a single Li-Ion battery or a +2.5 to

+5.5V power supply. Connect with short leads directly to the “Vin” and “Gnd” posts.

Note the SP6659 will remain in “shutdown” until the “RUN” Jumper J1 is applied to the

Vin or position 1 to 2.

2) VOUT PROGRAMMING

The SP6659 has a dynamically programmable output voltage using 2 feedback resistors

to control the output voltage:

2

1

6

.

0

1

R

Vout

R

•













−

=

OR













+

=

2

1

1

6

.

0

R

R

Vout

Table 1. SP6659EB BILL OF MATERIALS

Ref.Des. Qty Manufacturer

Part Number

Size

Component

Vendor

Eval bd

1

Sipex Corp

146-6595-00

1"x1.5"

SP6659 Eval board

Sipex 408-937-7500

U1

1

Sipex Corp

SP6659

SOT23-5

5 pins SOT23 DC/DC Conv

Sipex 408-937-7500

Cin

1

Murata

GRM188R60J475KE19D

0603

Ceramic 4.7uF 6.3V X5R

murata.com

Cout

1

Murata

GRM21BR60J106KE19

0805

Ceramic 10uF 6.3V X5R

murata.com

Cf

1

Murata

GRM1885C1H101JA01B

603

Ceramic 100pF 50V COG

murata.com

L1

1

Murata

LQH32CN2R2M53K

1210

2.2uH 790mA 97mΩ 1.5mm thick

murata.com

R1

1

Vishay

CRCW06032003F

0603

200KΩ, 1/10W, 1%

vishay.com

R2

1

Vishay

CRCW06031003F

0603

100KΩ, 1/10W, 1%

vishay.com

J1

1

Sullins

PTC36SAAN

.23x.12

3 Pin Header

800-digi-key

1

Sullins

STC02SYAN

.2x.1

Shunt

800-digi-key

TP

3

Mill-Max

0300-115-01-4727100

.042" dia

Test Point Female Pin

800-digi-key

Table 2. SP6659 PIN ASSIGNMENT

Pin Name

Pin Description

Pin

#

RUN

Power down control pin. Forcing this pin above 1.5V enables the

device. Forcing this pin below 0.3V shuts down the device.

1

GND

Ground pin

2

SW

Switching node

3

Power supply pin

4

Feedback. Receives the feedback voltage from an external

resistive divider across output.

5