LM2595

SNVS122B – MAY 1999 – REVISED APRIL 2013

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LM2595-12 Electrical Characteristics (continued)

Temperature Range.

Symbol

Parameter

Conditions

LM2595-12

Units

(Limits)

Typ

Limit

(1)

(2)

η

Efficiency

90

%

LM2595-ADJ Electrical Characteristics

Temperature Range.

Symbol

Parameter

Conditions

LM2595-ADJ

Units

(Limits)

Typ

Limit

(1)

(2)

Feedback Voltage

4.5V

1.230

V

1.193/1.180

V(min)

1.267/1.280

V(max)

η

Efficiency

78

%

(1)

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

(2)

All limits specified 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, and voltage programming resistors can affect

switching regulator system performance. When the LM2595 is used as shown in the Figure 21 test circuit, system performance will be

as shown in system parameters of Electrical Characteristics section.

All Output Voltage Versions Electrical Characteristics

Symbol

Parameter

Conditions

LM2595-XX

Units

(Limits)

Typ

Limit

(1)

(2)

DEVICE PARAMETERS

Feedback Bias Current

10

nA

50/100

nA (max)

Oscillator Frequency

150

kHz

127/110

kHz(min)

173/173

kHz(max)

Saturation Voltage

(4) (5)

1

V

1.2/1.3

V(max)

DC

Max Duty Cycle (ON)

100

%

Min Duty Cycle (OFF)

0

(1)

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

(2)

All limits specified 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)

The switching frequency is reduced when the second stage current limit is activated. The amount of reduction is determined by the

severity of current overload.

(4)

No diode, inductor or capacitor connected to output pin.

(5)

Feedback pin removed from output and connected to 0V to force the output transistor switch ON.

(6)

Feedback pin removed from output and connected to 12V for the 3.3V, 5V, and the ADJ. version, and 15V for the 12V version, to force

the output transistor switch OFF.

4

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