ULTRA-LOW VOLTAGE OPERATION CHARGE PUMP IC FOR STEP-UP DC-DC CONVERTER STARTUP

S-882Z Series

Seiko Instruments Inc.

5

Electrical Characteristics

Table 4

(Ta

= 25°C unless otherwise specified)

Parameter

Symbol

Conditions

Min.

Typ.

Max.

Unit

Measurement

Circuit

Discharge start

voltage

*1

= 0.35 V

− 0.1

+ 0.1

V

1

= 1.8 V

− 0.60

−

− 0.33

V

1

Discharge stop

voltage

*2

= 2.0 V

− 0.67

−

− 0.33

V

1

= 2.2 V

− 0.74

−

− 0.33

V

1

= 2.4 V

− 0.80

−

− 0.33

V

1

= 1.8 to 2.4 V,

Ta

= −40 to +85°C

0.35

−

3.0

V

2

Operating input

voltage

*3

= 1.8, 2.0 V,

Ta

= −30 to +60°C

0.30

−

3.0

V

2

Oscillation start

voltage

Not externally connected, voltage

−

−

0.3

V

−

Discharge

control switch

resistance

= 1.8 to 2.4 V,

= 3 mA

−

34

100

Ω

3

Discharge start

delay time

*4

−

7

25

s

2

Discharge start

voltage

temperature

coefficient

CPOUT1

CPOUT1

V

Ta

V

•

∆

∆

Ta

= −40 to +85°C

−

±150

±550

ppm/

°C

−

−

0.1

0.5

mA

4

−

0.5

1.5

mA

4

Current

consumption

during operation

−

1.2

3.0

mA

4

−

−

0.6

µA

5

−

−

0.7

µA

5

−

−

0.7

µA

5

Current

consumption

during shutdown

−

−

0.8

µA

5

Shutdown

voltage

*5

− 0.1

+ 0.1

V

6

Shutdown

voltage

temperature

coefficient

OFF

OFF

V

Ta

V

•

∆

∆

Ta

= −40 to +85°C

−

±150

±550

ppm/

°C

−

Discharge

control switch

leak current

*6

−

−

0.1

µA

7

VM pin input

current

= 3.0 V

−

1.0

1.9

µA

8

Oscillation

frequency

= 0.3 V

−

350

−

kHz

−

*1.

*2.

Voltage at which discharge to the OUT pin stops

*3.

Input voltage required to start discharge to the OUT pin from the startup capacitor

*4.

Delay time from when power is input to the VIN pin until the electric charge of the startup capacitor is discharged to the

OUT pin

*5.

Actual shutdown voltage value (VM pin voltage value at which shutdown actually occurs)

+ 0.1 V.

*6.

Current that flows into the IC from the OUT pin due to the off-leak current of the discharge control switch

Caution The voltage that is input to the connected step-up DC-DC converter varies according to the consumption

current of the step-up DC-DC converter and the power smoothing capacitor. Set the discharge start

voltage based on thorough evaluation including the temperature characteristics under the actual usage

conditions.