LM2594 datasheet(6/41 Pages) TI1

Numer części	LM2594

Szczegółowy opis	SIMPLE SWITCHER Power Converter 150-kHz 0.5-A Step-Down Voltage Regulator

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Producent	TI1 [Texas Instruments]

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LM2594, LM2594HV

SNVS118D – DECEMBER 1999 – REVISED MAY 2016

www.ti.com

Product Folder Links: LM2594 LM2594HV

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(1)

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

(2)

All limits ensured at room temperature and at temperature extremes. 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 LM2594/LM2594HV is used as shown in the Figure 35 test circuit, system

performance is as shown in the system parameters.

7.8 Electrical Characteristics – Adjustable

Specifications are for TJ = 25°C (unless otherwise noted).

PARAMETER

TEST CONDITIONS

MIN

TYP(1)

MAX(2)

UNIT

SYSTEM PARAMETERS(3) (see Figure 35 for test circuit)

VFB

Feedback voltage

4.5 V

≤ VIN ≤ VINmax,

0.1 A

≤ ILOAD ≤ 0.5 A,

VOUT programmed for 3 V,

Circuit of Figure 35

TJ = 25°C

1.193

1.23

1.267

V

Over full operating temperature range

1.18

1.28

η

Efficiency

VIN = 12 V, ILOAD = 0.5 A

80%

(1)

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

(2)

All limits ensured at room temperature and at temperature extremes. 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 0 V to force the output transistor switch ON.

(6)

Feedback pin removed from output and connected to 12 V for the 3.3-V, 5-V, and the adjustable version, and 15 V for the 12-V version,

to force the output transistor switch OFF.

(7)

VIN = 40 V for the LM2594 and 60 V for the LM2594HV.

7.9 Electrical Characteristics – All Output Voltage Versions

Specifications are for TJ = 25°C, VIN = 12 V for the 3.3-V, 5-V, and adjustable version, and VIN = 24 V for the 12-V version,

ILOAD = 100 mA (unless otherwise noted).

PARAMETER

TEST CONDITIONS

MIN

TYP(1)

MAX(2)

UNIT

DEVICE PARAMETERS

Ib

Feedback bias current

Adjustable version only, VFB =

1.3 V

TJ = 25°C

10

50

nA

Over full operating temperature range

100

fO

Oscillator frequency

See(3)

TJ = 25°C

127

150

173

kHz

Over full operating temperature range

110

173

VSAT

Saturation voltage

IOUT = 0.5 A

(4) (5)

TJ = 25°C

0.9

1.1

V

Over full operating temperature range

1.2

DC

Max duty cycle (ON)

See(5)

100%

Min duty cycle (OFF)

See(6)

0%

ICL

Current limit

Peak current(4)(5)

TJ = 25°C

0.65

0.8

1.3

A

over full operating temperature range

0.58

1.4

IL

Output leakage current

Output = 0 V(4)(6)(7)

Output =

−1 V

50

μA

2

15

mA

IQ

Quiescent current

See(6)

5

10

mA

ISTBY

Standby quiescent

current

ON/OFF pin = 5 V (OFF)(7)

85

μA

LM2594

TJ = 25°C

200

μA

Over full operating temperature range

250

LM2594HV

TJ = 25°C

140

250

μA

Over full operating temperature range

300

ON/OFF CONTROL (see Figure 35 for test circuit)

ON/OFF pin logic input

1.3

V

VIH

Threshold voltage

Low (regulator ON), over full operating temperature range

0.6

V

VIL

High (regulator OFF), over full operating temperature range

2

V

IH

ON/OFF pin input

current

VLOGIC = 2.5 V (regulator OFF)

5

15

μA

IL

VLOGIC = 0.5 V (regulator ON)

0.02

5

μA

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