SP6655EB Datasheet, PDF (2/4 Pages) Sipex Corporation – Evaluation Board Manual

USING THE EVALUATION BOARD
1) Powering up the SP6655 Circuit & Programming the UVLO threshold
The SP6655 Evaluation Board can be powered from a single Li-Ion battery or a +2.7 to
+5.0V power supply. Connect with short leads directly to the “Vin” and “Gnd” posts.
Note the SP6655 will remain in “shutdown” until D0 or D1 of the Jumpers J1 or J2 are
applied to the Vin or position 1 to 2. See Table 1 for UVLO threshold programming and
D1 and D0 pin definition.
Table 1. Operating Mode Definition
D1 D0 Definition
0 0 Shutdown. All internal circuitry is disabled and the power switches are opened.
0 1 Device enabled, falling UVLO threshold = 2.70V
1 0 Device enabled, falling UVLO threshold = 2.85V
1 1 Device enabled, falling UVLO threshold = 3.00V
2) VOUT PROGRAMMING
The SP6655 requires 2 feedback resistors to control the output voltage. Connect the
appropriate resistors RF and RI (Table 2) from pin 6 SP6655 FB to Vout and to the
GND.
For Vout different from that shown in the Table 2, use equation:
RF = ^Vout −1 • RI
 ^0.8 
Table 2. SP6655UEB BILL OF MATERIALS
Component
L1
CIN
COUT
RVIN
CVIN
RI
RF
CF
U1
Vo = 1.8V
10uH, Murata LQH32CN100K11, 0.3ohm, 0.45A, 1210
22uF, TDK C2012X5R0J106M, 0.005ohm, 6.3V, X5R, 0805
22uF, TDK C2012X5R0J106M, 0.005ohm, 6.3V, X5R, 0805
10 Ohm 5%, 0603
1uF, TDK C1608X5R0J105M, 0.03ohm, .3V, X5R, 0603
200k 1%, 0603
249k 1%, 0603
22pF ceramic, 0603
SP6655ER, 10 pin DFN