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ELECTRICAL CHARACTERISTICS (Continued)

TPS61140

TPS61141

SLVS624B – JANUARY 2006 – REVISED MARCH 2007

V

otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

VOLTAGE AND CURRENT CONTROL

Voltage feedback input bias current

100

nA

Voltage feedback regulation voltage

1.204

1.229

1.254

V

ISET pin voltage

1.204

1.229

1.254

V

Current multipiler

Iout/Iset

820

900

990

IFB Regulation voltage

300

330

360

mV

60

mV

Current sink settle time

6

µs

IFB pin leakage current

IFB voltage = 25 V

1

µA

Iout-Vout regulation threshold

Iout-Vout

270

330

380

mV

45

mV

Iout = 25 V, Vout = 0 V

1

µA

PSRR

LDO PSRR

Iout–Vout = 330 mV, 2 mA, 20 kHz

20

dB

POWER SWITCH AND DIODE

N-channel MOSFET on-resistance

0.6

0.9

Ω

1

µA

Power diode forward voltage

Id = 0.7 A

0.83

1.0

V

OC AND OVP

Dual output, V(Iout) = 15 V, D = 76%

0.75

1.0

1.26

Single output (PFM)

0.30

0.35

0.40

A

Single output (PWM), V(Iout) = 15 V,

0.40

0.55

0.70

D = 76%

Iout–Vout = 330 mV

35

mA

Current sink max output current

IFB = 330 mV

35

mA

TPS61140

27

28

29

Overvoltage threshold

V

TPS61141

21

22

23

TPS61140

550

Overvoltage hysteresis

mV

TPS61141

440

PWM AND PFM CONTROL

Oscillator frequency

1

1.2

1.5

MHz

Maximum duty cycle

PWM, VFB = 1 V

90

93

%

Maximum on time

PFM only

5.7

µs

Minimum off time

PFM only

413

ns

THERMAL SHUTDOWN

Thermal shutdown threshold

160

°C

Thermal shutdown threshold hysteresis

15

°C

(1)

in regulation. This only occurs in BOTH-ON mode.

(2)

This specification determines the minimum on time required for PWM dimming. Using this specification, the maximum PWM dimming

frequency can be calculated from the minimum duty cycle required in the application.

(3)

voltage. This only occurs in BOTH-ON mode.

(4)

Measured with DC current. See APPLICATION INFORMATION for details.

5

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