SP6650EB Datasheet, PDF (2/6 Pages) Sipex Corporation – Evaluation Board Manual

V_IN 2.7-6.5 VDC
RB ^RVIN
100k ^10.0
C_IN
47µF
®
1 _PVIN
LX ¹⁰
2 _VIN
PGND ⁹
3
3
SP6650
BLON
GND
8
2
4 _ILIM
V_OUT ⁷
1
5 _SHDN
FB ⁶
3
2
CV_IN
1
1.0µF
L1 22µH
V_OUT 3.3V
RF
OPEN
D1*
MBR0540TI
R1
100k
C_OUT
47µF
Figure 1. SP6650 Evaluation Board Schematic
The SP6650 Evaluation Board provides conve-
nient test points to connect the input to Power
Supply or Li-Ion Battery. The Input and Output
connections are made with raised female pin
receptacles which can accommodate easy-hook
connection leads for power and meter connec-
tions, as well as scope probe hooks and grounds
for waveform measurements.
USING THE EVALUATION BOARD
1) Powering Up the SP6650 Circuit
The SP6650 Evaluation Board can be powered
from a single Li-Ion battery or a +2.7 to +6.5V
power supply. Connect with short leads directly
to the “V_IN” and “GND” posts. Note the SP6650
will remain in “shutdown” until pin 2 of the
Jumper J2 is applied to the GND.
2) I LIM Programming
Connect pin 4 of the SP6650 to V_IN for 0.8 A
peak Inductor current limit (pins 2,3 of the
Jumper J2).
Connect pin 4 of the SP6650 to GND for 0.35
A peak Inductor current limit (pins 1,2 of the
Jumper J2).
3) V_OUT Programming
To control the output voltage externally con-
nect the appropriate resistors (Table 1)
From pin 6 SP6650 FB to V_OUT and to the
GND.
Tie Pin 6 FB to the 100k resistor or to the
GND and controller will use the internal
network for a preset output Voltage of 3.3V.
For V_OUT different from shown in the Table
1, use equation:
( ) RF = VOUT – 1 R1
1.25
(For V_OUT > 3.3V, RF = 50k recommended)
Rev. 3/23/01
SP6650 Evaluation Board Manual
2
© Copyright 2001 Sipex Corporation