SP6680EB Datasheet, PDF (3/5 Pages) Sipex Corporation – Evaluation Board Manual

changes with input changes. Also, you can see these mode changes by attaching a
scope probe to the “CF1P” post and observe how the pump waveform changes from the
2X mode to the 1.5X mode, as shown in the scope traces shown below. As seen in the
datasheet specification for Power Efficiency, by dynamically changing modes with input
voltages the SP6680 optimizes power efficiency.
Ch1 = CF2P
Ch2 = CF1P
Ch3 = Vin
Ch4 = Vout
Vin = 3.7V, 2X Mode 32kHz
Vin = 4.0V, 1.5X Mode 32kHz
TABLE2: SP6680UEB PIN ASSIGNMENTS
Pin No.
1
2
3
4
5
6
7
8
9
10
1
2
3
4
5
Pin Name
Pin Function
Input/Output Pin Name
U1 - SP6680UEB Pin Assignments
VOUT
PreRegulated 5.2 to 6.3Vout
VOUT
CFIP
Fly Capacitor One Positive
CFIP
VIN
Input Voltage
VIN
CD4
Digital Input for CLK/4
CD4
CX8
Digital Input for CLK*8
CX8
CLK
Clock Input
CLK
CF2N
Fly Capacitor Two Negative
GND
Ground
GND
CF1N
Fly Capacitor One Negative
CF2P
Fly Capacitor Two Positive
CF2P
U2 - SP6200EM5 Pin Assignments
VIN
LDO Input
GND
Ground
GND
ON/OFF_N
ON = H or Shutdown =L
N/C
No Connect
VOUT
+5V Output
+5V
Rev. 6/27/01
SP66680 Evaluation Board Manual
3
© Copyright 2001 Sipex Corporation