Cypress Semiconductor Perform CY8C21x23 User Manual download pdf (Page 18)

February 25, 2005 Document No. 38-12022 Rev. *G 18

CY8C21x23 Final Data Sheet 3. Electrical Specifications

3.3.4 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

≤ 85°C, 3.0V to 3.6V and -40°C ≤ T

≤ 85°C, or 2.4V to 3.0V and -40°C ≤ T

≤ 85°C, respectively. Typical parameters

apply to 5V, 3.3V, or 2.7V 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

PUMP5V

5V Output Voltage from Pump 4.75 5.0 5.25 V

Configuration of footnote.

Average, neglecting

ripple. SMP trip voltage is set to 5.0V.

PUMP3V

3.3V Output Voltage from Pump 3.00 3.25 3.60 V

Configuration of footnote.

Average, neglecting

ripple. SMP trip voltage is set to 3.25V.

PUMP2V

2.6V Output Voltage from Pump 2.45 2.55 2.80 V

Configuration of footnote.

Average, neglecting

ripple. SMP trip voltage is set to 2.55V.

PUMP

Available Output Current

BAT

= 1.8V, V

PUMP

= 5.0V

BAT

= 1.5V, V

PUMP

= 3.25V

BAT

= 1.3V, V

PUMP

= 2.55V

–

Configuration of footnote.

SMP trip voltage is set to 5.0V.

SMP trip voltage is set to 3.25V.

SMP trip voltage is set to 2.55V.

BAT5V

Input Voltage Range from Battery 1.8 – 5.0 V

Configuration of footnote.

SMP trip voltage is

set to 5.0V.

BAT3V

Input Voltage Range from Battery 1.0 – 3.3 V

Configuration of footnote.

SMP trip voltage is

set to 3.25V.

BAT2V

Input Voltage Range from Battery 1.0 – 2.8 V

Configuration of footnote.

SMP trip voltage is

set to 2.55V.

BATSTART

Minimum Input Voltage from Battery to Start Pump 1.2 – – V

Configuration of footnote.

C ≤ T

≤ 100.

1.25V at T

= -40

∆V

PUMP_Line

Line Regulation (over Vi range) – 5 – %V

Configuration of footnote.

is the “Vdd Value

for PUMP Trip” specified by the VM[2:0] setting

in the DC POR and LVD Specification, Table 3-

11 on page 19.

∆V

PUMP_Load

Load Regulation – 5 – %V

Configuration of footnote.

is the “Vdd Value

for PUMP Trip” specified by the VM[2:0] setting

in the DC POR and LVD Specification, Table 3-

11 on page 19.

∆V

PUMP_Ripple

Output Voltage Ripple (depends on cap/load) – 100 – mVpp

Configuration of footnote.

Load is 5 mA.

a. L

= 2 µH inductor, C

= 10 µF capacitor, D

= Schottky diode. See Figure 3-2.

Efficiency 35 50 – %

Configuration of footnote.

Load is 5 mA. SMP

trip voltage is set to 3.25V.

Efficiency 35 80 – % For I load = 1mA, V

PUMP

= 2.55V, V

BAT

= 1.3V,

10 uH inductor, 1 uF capacitor, and Schottky

diode.

PUMP

Switching Frequency – 1.3 – MHz

PUMP

Switching Duty Cycle – 50 – %

Battery

PSoC

Vdd

Vss

SM P

BAT

PUMP

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 32 33

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