Zetex ZXCP330E6 Datasheet

ZXCP330

SWITCHED CAPACITOR DC-DC CONVERTER

DEVICE DESCRIPTION

The ZXCP330 is the first in a series of switched capacitor DC to DC converters,
converting aninput voltage from between2 volts and 4.4volts to aregulated
output voltage of 3.3V with a maximum load current of 40mA. The device
operates with one flying capacitor and two small bypass capacitors at input
and output making for a very small solution. Very low quiescent current
makes thesedevicesidealfor low powerand battery powered applications.

Regulation isachieved by sensing the outputand enabling the device chargepump when it falls belowthe sense
threshold. This technique leads to high efficiency conversion. The method is also efficient for low current loads.
Here the dutycycle will be lowand the quiescent currentdrawn whilst the chargepump is disabled isvery small.

The device includes a pin for logic controlled shutdown of the output, and also features thermal shutdown, which
protects against shortcircuit damageas wellas excessive temperatures.The deviceis suppliedin a 6lead SOT-23
package.

Contact Zetex marketing for availability of other voltage options.

FEATURES

· Very low power: I

· Regulated output voltage: 3.3V, ± 4%

· Output current: 20mA at V

·

Output current: 40mA at V

·

No inductors required

·

Very low shutdown current: <1µA

·

Short circuit and over-temp protected

·

Very small package: SOT23-6 pin

= 20µA

Q

IN

IN

= 2V

= 2.5V

APPLICATIONS DIAGRAM

APPLICATIONS

· Battery backup supplies

· Smart card readers

· Li-Ion battery backup supplies

·

SIM interface supplies for cellular phones

·

Hand held computers

PROVISIONAL ISSUE A - DECEMBER 2001

1

ZXCP330

ABSOLUTE MAXIMUM RATINGS

VINto G
E
V
I

ND

to ground -0.3V to +7V

N

to ground -0.3V to +5.5V

OUT

OUT

ELECTRICAL CHARACTERISTICS

TEST CONDITIONS (unless otherwise stated): TA=-40°C to 85°C, (typical values at 25°), EN=VIN,C

C

=10␮F, C

IN

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNIT

Input Voltage V
Output Voltage

Note 1
Maximum Output Current I

Output Short-Circuit Current I
Supply Current I
Efficiency ␩ V
Switching Frequency f
Line Regulation (Note 2) ⌬V

Load Regulation (Note 2) ⌬V

Output Voltage Ripple V

Enable pin Input Threshold
High

Enable pin Input Threshold
Low

Enable pin Input current I
Shutdown supply Current I

Shutdown time (Note 3) T

Turn-on Time T

V

OUT

Thermal Shutdown
Temperature

OUT

=10␮F

-0.3V to +7V

Operating Temperature -40°C to 85°C
Storage Temperature Range -55°C to 125°C
Continuous Power Dissipation Thermally ltd

150mA

IN

V

OUT

O(max)

SC

Q

OSC

R

V

EN(ON)

V

EN(OFF

EN

Q(SD)

SD

ON

T

SD

LDR

LDR

2VⱕVINⱕ 4.4V, I

2.5VⱕV

ⱕ4.4V, I

IN

VINⱖ 2V

ⱖ 2.5V

V

IN

VIN= 2V 125 mA
2Vⱕ VINⱕ 4.4V , No load 20 40 ␮A

=2V, I

IN

OUT

Oscillator free running 500 kHz
VIN=2.5V to 4.4V, I

T

=25°C

A

I

=1mA to 40mA, VIN=2.5V

OUT

T

=25°C

A

f=500kHz, VIN=2.5V,
I

= 40mA

OUT

Device active 1.5 5.5 V

) Device shutdown 0 0.3 V

TA=25°C, EN= 4.4V 100 nA
EN=0V, 2V ⱕ VINⱕ 4.4V,

T

=25°C

A

VIN= 2.5V, ENchanges from

1.5V to 0.3V
VIN=2V, I

OUT

ⱕ20mA

OUT

ⱕ40mA

OUT

= 20mA 82 %

=40mA,

OUT

= 0mA 500 ␮ s

2.0 4.4 V

3.17

3.3

3.17

3.3

20
40

-50 0 50 mV

-50 0 50 mV

20 mV pk-pk

20 ␮s

135 150 165 °C

FLY

3.43

V

3.43
mA

1 ␮A

=0.22␮F,

Note 1: Contact Zetex marketing for availability of alternative output voltages
Note 2: Output can deviate EITHER side of Vnominal for increased load current or line voltage
Note 3: Shutdown time is the time taken for I

to reduce to <1␮A

IN

PROVISIONAL ISSUE A - DECEMBER 2001

2

TYPICAL CHARACTERISTICS

ZXCP330

PROVISIONAL ISSUE A - DECEMBER 2001

3