LT1534 データシートの表示（PDF） - Linear Technology

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LT1534

Ultralow Noise 2A Switching Regulators

Linear Technology 

LT1534/LT1534-1

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

temperature range, otherwise specifications are at TA = 25°C, VIN = 5V, VC = 0.9V, VFB = VREF. COL, SHDN, NFB, all other pins open

unless otherwise noted.

SYMBOL PARAMETER

Error Amplifiers

VNFR

Negative Feedback Reference Voltage

INFR

NFBREG

gm

Negative Feedback Input Current

Negative Feedback Reference Voltage

Line Regulation

Error Amplifier Transconductance

CONDITIONS

Measured at Negative Feedback Pin with

Feedback Pin Open

VNFB = VNFR

2.7V ≤ VIN ≤ 23V

∆IC = ±25µA

IESK

Error Amplifier Sink Current

IESRC

Error Amplifier Source Current

VCLH

Error Amplifier Clamp Voltage

VCLL

Error Amplifier Clamp Voltage

AV

Error Amplifier Voltage Gain

Oscillator and Sync

f MAX

Maximum Switch Frequency

f SYNC

Synchronization Frequency Range

RSYNC

SYNC Pin Input Resistance

VFBfs

FB Pin Threshold for Frequency Shift

Output Switches

VFB = VREF + 150mV, VC = 0.9V, VSHDN = 1V

VFB = VREF – 150mV, VC = 0.9V, VSHDN = 1V

High Clamp, VFB = 1V

Low Clamp, VFB = 1.5V

fOSC = 250kHz

5% Reduction from Nominal

DCMAX

tIBL

BVCOL

RON

ILIM

Maximum Switch Duty Cycle

Switch Current Limit Blanking Time

Output Switch Breakdown Voltage

Output Switch-On Resistance

Switch Current Limit

RVSL = RCSL = 4.9k, fOSC = 25kHz

2.7V ≤ VIN ≤ 23V

ICOL = 1.5A, Both COL Pins Tied Together

Duty Cycle = 30%

Duty Cycle = 80%

∆IIN/∆ISW Supply Current Increase During

Switch-On Time

Slew Control

VSLEWR

VSLEWF

ISLEWR

ISLEWF

Output Voltage Slew Rising Edge

Output Voltage Slew Falling Edge

Output Current Slew Rising Edge

Output Current Slew Falling Edge

RVSL, RCSL = 17k

RVSL, RCSL = 17k

RVSL, RCSL = 17k

RVSL, RCSL = 17k

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

of a device may be impaired.

MIN TYP MAX

UNITS

q – 2.550 – 2.500 – 2.420

q – 37 – 25

q

0.002 0.05

1100 1500 1900

q 700

2300

q 120

200

350

q 120

200

350

1.33

0.1

180 250

V

µA

%/V

µmho

µmho

µA

µA

V

V

V/ V

250

kHz

q

375

kHz

40

kΩ

0.4

V

q 88

q 35

q

2

1.6

91

200

0.25 0.43

16

%

ns

V

Ω

A

A

mA/A

11

V/µs

14.5

V/µs

1.3

A/µs

1.3

A/µs

3

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