LM2672M-3.3 datasheet(4/33 Pages) TI

部品番号	LM2672M-3.3

部品情報	LM2672 SIMPLE SWITCHER Power Converter High Efficiency 1A Step-Down Voltage

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LM2672

SNVS136K – SEPTEMBER 1998 – REVISED APRIL 2013

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LM2672-12 Electrical Characteristics

Symbol

Parameter

Conditions

Typ(1)

Min(2)

Max(2)

Units

SYSTEM PARAMETERS Test Circuit Figure 22(3)

VOUT

Output Voltage

VIN = 15V to 40V, ILOAD = 20 mA to 1A

12

11.82/11.64

12.18/12.36

V

η

Efficiency

VIN = 24V, ILOAD = 1A

94

%

(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 performance. When the LM2672 is used as shown in Figure 22 and Figure 23 test circuits, system performance will

be as specified by the system parameters section of the Electrical Characteristics.

LM2672-ADJ Electrical Characteristics

Symbol

Parameter

Conditions

Typ(1)

Min(2)

Max(2)

Units

SYSTEM PARAMETERS Test Circuit Figure 23(3)

VFB

Feedback Voltage

VIN = 8V to 40V, ILOAD = 20 mA to 1A

1.210

1.192/1.174

1.228/1.246

V

VOUT Programmed for 5V

(see Circuit of Figure 23)

VFB

Feedback Voltage

VIN = 6.5V to 40V, ILOAD = 20 mA to 500 mA

1.210

1.192/1.174

1.228/1.246

V

VOUT Programmed for 5V

(see Circuit of Figure 23)

η

Efficiency

VIN = 12V, ILOAD = 1A

90

%

(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 performance. When the LM2672 is used as shown in Figure 22 and Figure 23 test circuits, system performance will

be as specified by the system parameters section of the Electrical Characteristics.

All Output Voltage Versions

Specifications with standard type face are for TJ = 25°C, and those in bold type face apply over full Operating Temperature

Range. Unless otherwise specified, VIN = 12V for the 3.3V, 5V, and Adjustable versions and VIN = 24V for the 12V version,

and ILOAD = 100 mA.

Symbol

Parameters

Conditions

Typ

Min

Max

Units

DEVICE PARAMETERS

IQ

Quiescent Current

VFEEDBACK = 8V

2.5

3.6

mA

For 3.3V, 5.0V, and ADJ Versions

VFEEDBACK = 15V

2.5

mA

For 12V Versions

ISTBY

Standby Quiescent Current

ON/OFF Pin = 0V

50

100/150

μA

ICL

Current Limit

1.55

1.25/1.2

2.1/2.2

A

IL

Output Leakage Current

VIN = 40V, ON/OFF Pin = 0V

1

25

μA

VSWITCH = 0V

VSWITCH = −1V, ON/OFF Pin = 0V

6

15

mA

RDS(ON)

Switch On-Resistance

ISWITCH = 1A

0.25

0.30/0.50

Ω

fO

Oscillator Frequency

Measured at Switch Pin

260

225

275

kHz

D

Maximum Duty Cycle

95

%

Minimum Duty Cycle

0

%

IBIAS

Feedback Bias

VFEEDBACK = 1.3V

85

nA

Current

ADJ Version Only

4

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