LM2640

SNVS019B – DECEMBER 1998 – REVISED APRIL 2013

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Electrical Characteristics

junction temperature range for operation, 0 to +125°C. Unless otherwise specified under the Parameter or Conditions

(1) (2) (3)

Symbol

Parameter

Conditions

Typical

Limit

Units

System

Input Supply Voltage Range

5.5

V(min)

30

V(max)

Output Voltage Adjustment

2.2

V(min)

Range

6.0

V(max)

Load Regulation

0 mV

≤ (CSH1-CSL1) ≤ 80 mV,

0.5

%

0 mV

≤ (CSH2-CSL2) ≤ 80 mV

Line Regulation

5.5V

0.002

%/V

Input Supply Current

0.6

mA

1

mA(max)

80

µA

150

µA(max)

25

µA

60

µA(max)

Soft-Start Source Current

4.75

µA

2.0

µA(min)

7.0

µA(max)

Soft-Start Sink Current

10

µA

Positive Current Limit Voltage

100

mV

(Voltage from CSH1 to CSL1

80

mV(min)

and from CSH2 to CSL2)

140

mV(max)

100

75

mV(min)

Negative Current Limit Voltage

−100

mV

(Voltage from CSH1 to CSL1

−80

mV(min)

and from CSH2 to CSL2)

−140

mV(max)

70

%

Latch Threshold

60

%(min)

80

%(max)

150

%

Latch Threshold

135

%(min)

165

%(max)

(1)

Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which

operation of the device is specified. Operating Ratings do not imply specified performance limits. For specified performance limits and

associated test conditions, see the Electrical Characteristics tables.

(2)

(3)

and cold limits are specified by correlating the electrical characteristics to process and temperature variations and applying statistical

process control.

(4)

Both controllers are ON but not switching. Currents entering the IC at IN, CSL1, CSH1, CSL2, and CSH2 are measured. Those entering

at CSL1 and CSH1 are multiplied by 0.50 to emulate the effect of a switching conversion from 10V down to 5V. Those entering at CSL2

and CSH2 are multiplied by 0.33 to emulate the effect of a switching conversion from 10V down to 3.3V. After multiplication, all five

supply current enters the IC via the CSL1 input.

(5)

Both switching controllers are OFF. The 5V, 50 mA linear regulator (output at LIN) and the precision 2.5V reference (output at REF)

remain ON.

(6)

Both switching controllers and the 2.5V precision reference are OFF. The 5V, 50 mA linear regulator remains ON.

6

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