TC115 datasheet(2/14 Pages) MICROCHIP

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TC115

DS21361C-page 2

 2003 Microchip Technology Inc.

1.0

ELECTRICAL

CHARACTERISTICS

Absolute Maximum Ratings†

Power Supply Voltage (PS)...............................................12V

Power Dissipation ......................................................500 mW

LX Sink Current......................................................400 mA pk

SHDN Input Voltage ..........................................................12V

Operating Temperature Range........................-40°C to +85°C

Storage Temperature Range.........................-40°C to +125°C

† Stresses above those listed under "Absolute Maximum

Ratings" may cause permanent damage to the device. These

are stress ratings only and functional operation of the device

at these or any other conditions above those indicated in the

operation sections of the specifications is not implied.

Exposure to Absolute Maximum Rating conditions for

extended periods may affect device reliability.

PIN FUNCTION TABLE

DC CHARACTERISTICS

Symbol

Description

Not connected

Power and voltage sense input

SHDN

Shutdown input

Inductor switch output

GND

Ground terminal

Electrical Specifications: Unless otherwise noted, VOUT = 5V, TA = +25°C. Circuit configuration is illustrated in Figure 5-1.

Parameters

Sym

Min

Typ

Max

Units

Conditions

Operating Supply Voltage

VIN

0.9

—

10.0

Note 5

Start-Up Supply Voltage

VSTART

——

0.9

IOUT = 1 mA

LX Maximum Sink Current

ILXMAX

——

350

LX Limit Frequency

fLIM

—200

—kHz

VLX = VLXLIM

LX Limit Voltage

VLXLIM

0.7

—

1.3

Note 2

No Load Supply Current

IDD

—13

µA

IOUT = 0, VIN = VOUT x 0.8 (Note 3)

Boost Mode Supply Current

ICC

—

135

µA

No external components,

VIN = (0.95 x VOUT) applied to PS (or

VDD) input

Standby Supply Current

ISTBY

—

µA

No external components,

VIN = (1.1 x VOUT) applied to PS

(or VDD) input

Shutdown Supply Current

ISD

——

0.5

µA

SHDN = 0V

Oscillator Frequency

fOSC

100

115

kHz

Note 2, Note 4

Output Voltage

VOUT

VR x 0.975

VR x 1.025

VIN = 2.2V minimum (Note 1)

LX Output ON Resistance

Rswon

—

1.4

2.4

Ω

VLX = 0.4V

Duty Cycle

(PFM Operating Mode)

PFMDUTY

No external components

Maximum Duty Cycle

MAXDUT

Note 4

Soft Start Time

tSS

410

msec

Efficiency

—

SHDN Input Logic High

VIH

0.75

—

SHDN Input Logic Low

VIL

—

0.20

Note 1:

VR is the nominal factory-programmed output voltage setting.

VLXLIM is the voltage on the LX pin (with internal switch ON) that will cause the oscillator to run at twice nominal

frequency in to limit the switch current through the internal N-channel switching transistor.

Measured with D1 = MA735 (reverse current < 1 µA at a reverse voltage of 10V).

With TC115 operating in PWM mode.

See Section 4.4, “Behavior When VIN is Greater Than the Factory-Programmed VOUT Setting”.

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