
August 3, 2004
Document No. 38-12012 Rev. *I
23
CY8C27x43 Final Data Sheet
3. Electrical Specifications
3.3.5
DC Switch Mode Pump Specifications
The following table lists guaranteed maximum and minimum specifications for the voltage and temperature ranges: 4.75V to 5.25V
and -40
°
C
≤
T
A
≤
85
°
C, or 3.0V to 3.6V and -40
°
C
≤
T
A
≤
85
°
C, respectively. Typical parameters apply to 5V and 3.3V at 25
°
C and
are for design guidance only.
Figure 3-2. Basic Switch Mode Pump Circuit
Table 3-10. DC Switch Mode Pump (SMP) Specifications
Symbol
Description
Min
Typ
Max
Units
Notes
V
PUMP
5V
5V Output Voltage
4.75
5.0
5.25
V
Configuration of footnote
a
. Average, neglecting
ripple. SMP trip voltage is set to 5.0V.
a. L
1
= 2
μ
H inductor, C
1
= 10
μ
F capacitor, D
1
= Schottky diode. See Figure3-2.
V
PUMP
3V
3V Output Voltage
3.00
3.25
3.60
V
Configuration of footnote
a
. Average, neglecting
ripple. SMP trip voltage is set to 3.25V.
I
PUMP
Available Output Current
V
BAT
= 1.5V, V
PUMP
= 3.25V
V
BAT
= 1.8V, V
PUMP
= 5.0V
8
5
–
–
–
–
mA
mA
Configuration of footnote
a
.
SMP trip voltage is set to 3.25V.
SMP trip voltage is set to 5.0V.
V
BAT
5V
Input Voltage Range from Battery
1.8
–
5.0
V
Configuration of footnote
a
. SMP trip voltage is
set to 5.0V.
V
BAT
3V
Input Voltage Range from Battery
1.0
–
3.3
V
Configuration of footnote
a
. SMP trip voltage is
set to 3.25V.
V
BATSTART
Minimum Input Voltage from Battery to Start Pump
1.1
–
–
V
Configuration of footnote
a
.
V
PUMP_Line
Line Regulation (over V
BAT
range)
–
5
–
%V
O
Configuration of footnote
a
. V
O
is the “Vdd
Value for PUMP Trip” specified by the VM[2:0]
setting in the DC POR and LVD Specification,
Table 3-16 on page 26
.
V
PUMP_Load
Load Regulation
–
5
–
%V
O
Configuration of footnote
a
. V
O
is the “Vdd
Value for PUMP Trip” specified by the VM[2:0]
setting in the DC POR and LVD Specification,
Table 3-16 on page 26
.
V
PUMP_Ripple
Output Voltage Ripple (depends on capacitor/load)
–
100
–
mVpp
Configuration of footnote
a
. Load is 5mA.
E
3
Efficiency
35
50
–
%
Configuration of footnote
a
. Load is 5 mA. SMP
trip voltage is set to 3.25V.
F
PUMP
Switching Frequency
–
1.3
–
MHz
DC
PUMP
Switching Duty Cycle
–
50
–
%
Battery
C1
D1
+
PSoC
TM
Vdd
Vss
SMP
V
BAT
V
PUMP
L
1