LTC1751 データシートの表示（PDF） - Linear Technology

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LTC1751

Micropower, Regulated Charge Pump DC/DC Converters

Linear Technology 

LTC1751/LTC1751-3.3/LTC1751-5

ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full specified

temperature range, otherwise specifications are at TA = 25°C. CFLY = 1µF, CIN = 10µF, COUT = 10µF unless otherwise noted.

SYMBOL PARAMETER

CONDITIONS

MIN TYP MAX

UNITS

LTC1751-3.3/LTC1751-5

UVL

PGOOD Undervoltage Low Threshold

UVH

PGOOD Undervoltage High Threshold

VOL

PGOOD Low Output Voltage

IOH

PGOOD High Output Leakage

LTC1751/LTC1751-3.3/LTC1751-5

Relative to Regulated VOUT (Note 6)

Relative to Regulated VOUT (Note 6)

IPGOOD = – 500µA

VPGOOD = 5.5V

q –11

–7

–3

%

q –8

– 4.5

–2

%

q

0.4

V

q

1

µA

ISHDN

Shutdown Supply Current

VIN ≤ 3.6V, VOUT = 0V, VSHDN = 0V

3.6V < VIN, VOUT = 0V, VSHDN = 0V

q

0.01

2

µA

q

5

µA

VIH

SHDN Input Threshold (High)

q 1.5

V

VIL

SHDN Input Threshold (Low)

q

0.3

V

IIH

SHDN Input Current (High)

SHDN = VIN

q –1

1

µA

IIL

SHDN Input Current (Low)

SHDN = 0V

q –1

1

µA

tr

VOUT Rise Time

VIN = 3V, IOUT = 0mA, 10% to 90% (Note 6)

0.6ms/nF • CSS

sec

fOSC

Switching Frequency

Oscillator Free Running

800

kHz

Note 1: Absolute Maximum Ratings are those values beyond which the life

of a device may be impaired.

Note 2: Based on long term current density limitations.

Note 3: The LTC1751EMS8-X is guaranteed to meet performance

specifications from 0°C to 70°C. Specifications over the – 40°C to 85°C

operating temperature range are assured by design, characterization and

correlation with statistical process controls.

Note 4: The no load input current will be approximately ICC plus twice the

standing current in the resistive output divider.

Note 5: ROUT ≡ (2VIN – VOUT)/IOUT.

Note 6: See Figure 2.

TYPICAL PERFOR A CE CHARACTERISTICS

(LTC1751-3.3)

Output Voltage vs Load Current

3.40

TA = 25°C

CFLY = 1µF

3.35

VIN = 2.5V

3.30

VIN = 2V

3.25

Output Voltage vs Input Voltage

3.40

IOUT = 40mA

CFLY = 1µF

COUT = 10µF

3.35

TA = –40°C

TA = 25°C

TA = 85°C

3.30

3.25

3.20

0

25 50 75 100 125 150

LOAD CURRENT (mA)

1751 G01

3.20

2.0

2.5 3.0 3.5 4.0 4.5

INPUT VOLTAGE (V)

1751 G02

No Load Supply Current

vs Input Voltage

40

IOUT = 0mA

CFLY = 1µF

VSHDN = VIN

30

TA = 85°C

20

TA = 25°C

TA = –40°C

10

0

2.0 2.5 3.0 3.5 4.0 4.5

INPUT VOLTAGE (V)

1751 G03

3

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