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LT3430

sn3430 3430is

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Minimum Input Voltage

(Note 3)

4.6

5.5

Minimum Boost Voltage

(Note 4) ISW ≤ 3A

1.8

Boost Current (Note 5)

Boost = VIN + 5V, ISW = 1A

Boost = VIN + 5V, ISW = 3A

120

Input Supply Current (IVIN)

(Note 6) VBIAS = 5V

1.5

2.2

Bias Supply Current (IBIAS)

(Note 6) VBIAS = 5V

3.1

4.2

Shutdown Supply Current

SHDN = 0V, VIN ≤ 60V, SW = 0V, VC Open

100

µA

200

µA

Lockout Threshold

VC Open

–40

°C ≤ TJ < 25°C

2.2

2.48

°C ≤ TJ ≤ 125°C

2.3

2.38

2.48

Shutdown Thresholds

VC Open, Shutting Down

0.15

0.37

0.58

VC Open, Starting Up

0.25

0.42

0.60

Minimum SYNC Amplitude

1.5

SYNC Frequency Range

228

700

kHz

SYNC Input Resistance

Ω

The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TJ = 25°C.

VIN = 15V, VC = 1.5V, SHDN = 1V, BOOST = Open Circuit, SW = Open Circuit, unless otherwise noted.

ELECTRICAL CHARACTERISTICS

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

of a device may be impaired.

Note 2: Gain is measured with a VC swing equal to 200mV above the low

clamp level to 200mV below the upper clamp level.

Note 3: Minimum input voltage is not measured directly, but is guaranteed

by other tests. It is defined as the voltage where internal bias lines are still

regulated so that the reference voltage and oscillator remain constant.

Actual minimum input voltage to maintain a regulated output will depend

upon output voltage and load current. See Applications Information.

Note 4: This is the minimum voltage across the boost capacitor needed to

guarantee full saturation of the internal power switch.

Note 5: Boost current is the current flowing into the BOOST pin with the

pin held 5V above input voltage. It flows only during switch on time.

Note 6: Input supply current is the quiescent current drawn by the input

pin when the BIAS pin is held at 5V with switching disabled. Bias supply

current is the current drawn by the BIAS pin when the BIAS pin is held at

5V. Total input referred supply current is calculated by summing input

supply current (IVIN) with a fraction of bias supply current (IBIAS):

ITOTAL = IVIN + (IBIAS)(VOUT/VIN)

With VIN = 15V, VOUT = 5V, IVIN = 1.4mA, IBIAS = 2.9mA, ITOTAL = 2.4mA.

Note 7: Switch on resistance is calculated by dividing VIN to SW voltage by

the forced current (3A). See Typical Performance Characteristics for the

graph of switch voltage at other currents.

Note 8: The LT3430EFE is guaranteed to meet performance specifications

from 0

°C to 125°C junction temperature. Specifications over the –40°C to

125

°C operating junction temperature range are assured by design,

characterization and correlation with statistical process controls. The

LT3430IFE is guaranteed over the full –40

°C to 125°C operating junction

temperature range.

Note 9: See Peak Switch Current Limit vs Junction Temperature graph in

the Typical Performance Characteristics section.

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