DICE/DWF SPECIFICATION

2

RH1959MILDICE

Wafer level testing is performed per the indicated specifications for dice. Considerable differences in performance can often be observed for dice versus

packaged units due to the influences of packaging and assembly on certain devices and/or parameters. Please consult factory for more information

on dice performance and lot qualifications via lot sampling test procedures.

Dice data sheet subject to change. Please consult factory for current revision in production.

I.D.No. 66-13-3415

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: Dice are probe tested at 25°C to the limits shown except for high

current tests. Dice are tested under low current conditions which assure

full load current specifications when assembled in packaging systems

approved by Linear Technology.

Note 3: Gain is measured with a VC swing equal to 200mV above the

switching threshold level to 200mV below the upper clamp level.

Note 4: 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 frequency remain

constant. Actual minimum input voltage to maintain a regulated output will

depend on output voltage and load current.

Note 5: This is the minimum voltage across the boost capacitor needed to

guarantee full saturation of the internal power switch.

Note 6: 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 7: Input supply current is the bias current drawn by the input pin

with switching disabled.

by the forced current (4.5A).

Note 9: This parameter is not measured directly, but is guaranteed by

design.

LinearTechnology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417



LINEAR TECHNOLOGY CORPORATION 2014

LT 0814 • PRINTED IN USA

PARAMETER

CONDITIONS

MIN

MAX

UNITS

Feedback Voltage (Adjustable)

All Conditions

1.19

1.23

V

Reference Voltage Line Regulation

–0.03

0.03

%/V

Feedback Input Bias Current

–0.5

0.5

µA

Error Amplifier Voltage Gain (Note 3)

200

Error Amplifier Transconductance (Note 9)

DI (VC) = ±10mA

1500

2700

mMho

Error Amplifier Source Current

140

320

mA

140

320

mA

Switch Current Limit (Note 9)

4.5

8.5

A

Switch On Resistance (Notes 8, 9)

0.1

Ω

90

%

Switch Frequency

VC Set to Give 50% Duty Cycle

460

540

kHz

Switch Frequency Line Regulation

–0.15

0.15

%/V

Frequency Shifting Threshold on FB Pin

Df = 10kHz

0.5

1

V

Minimum Input Voltage (Note 4)

4.3

V

Minimum Boost Voltage (Notes 5, 9)

3

V

Boost Current (Notes 6, 9)

35

140

mA

mA

Input Supply Current (Note 7)

5.4

mA

Shutdown Supply Current

50

µA

Lockout Threshold

2.3

2.46

V

Shutdown Thresholds

VC Open Device Shutting Down

Device Starting Up

0.13

0.25

0.6

0.7

V

V

Synchronization Threshold

2.2

V

Synchronizing Range

580

1000

kHz