LM2599

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SNVS123C – APRIL 1998 – REVISED APRIL 2013

Absolute Maximum Ratings

(1) (2)

45V

6V

1.5V

Flag Pin Voltage

−0.3 ≤ V ≤45V

Feedback Pin Voltage

−0.3 ≤ V ≤+25V

Output Voltage to Ground

(Steady State)

−1V

Power Dissipation

Internally limited

Storage Temperature Range

−65°C to +150°C

ESD Susceptibility

2 kV

Lead Temperature

KTW Package

Vapor Phase (60 sec.)

+215°C

Infrared (10 sec.)

+245°C

NDZ Package (Soldering, 10 sec.)

+260°C

Maximum Junction Temperature

+150°C

(1)

Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for

which the device is intended to be functional, but do not ensure specific performance limits. For ensured specifications and test

conditions, see the Electrical Characteristics section.

(2)

If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and

specifications.

(3)

Voltage internally clamped. If clamp voltage is exceeded, limit current to a maximum of 1 mA.

(4)

The human body model is a 100 pF capacitor discharged through a 1.5k resistor into each pin.

Operating Conditions

Temperature Range

Supply Voltage

4.5V to 40V

LM2599-3.3 Electrical Characteristics

Temperature Range.

Symbol

Parameter

Conditions

LM2599-3.3

Units

(Limits)

Typ

Limit

(1)

(2)

Output Voltage

4.75V

3.3

V

3.168/3.135

V(min)

3.432/3.465

V(max)

η

Efficiency

73

%

(1)

Typical numbers are at 25°C and represent the most likely norm.

(2)

All limits ensured at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits

are 100% production tested. All limits at temperature extremes are specified via correlation using standard Statistical Quality Control

(SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).

(3)

External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance.

When the LM2599 is used as shown in the Figure 24 test circuit, system performance will be as shown in system parameters of

Electrical Characteristics section.

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