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LT1129/LT1129-3.3/LT1129-5

112935ff

ELECTRICAL CHARACTERISTICS The l denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at TA = 25°C.

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Ripple Rejection

VIN – VOUT = 1V (Avg), VRIPPLE = 0.5VP-P,

fRIPPLE = 120Hz, ILOAD = 0.7A, TJ = 25°C

Current Limit

VIN – VOUT = 7V, TJ = 25°C

1.2

1.6

Input Reverse Leakage Current

VIN = –20V, VOUT = 0V

1.0

Reverse Output Current (Note 11)

LT1129-3.3

VOUT = 3.3V, VIN = 0V

LT1129-5

VOUT = 5V, VIN = 0V

LT1129 (Note 5)

VOUT = 3.8V, VIN = 0V

μA

voltage will be equal to (VIN – VDROPOUT). Dropout voltage is measured

between the input pin and the output pin. External voltage drops between

the output pin and the sense pin will add to the dropout voltage.

Note 7: Ground pin current is tested with VIN = VOUT (nominal) and a

current source load. This means that the device is tested while operating in

its dropout region. This is the worst case ground pin current. The ground

pin current will decrease slightly at higher input voltages.

Note 8: Adjust pin bias current ﬂows into the adjust pin.

Note 9: Shutdown pin current at VSHDN = 0V ﬂows out of the shutdown pin.

Note 10: Quiescent current in shutdown is equal to the sum total of the

shutdown pin current (6μA) and the ground pin current (9μA).

Note 11: Reverse output current is tested with the input pin grounded. The

output pin and the sense pin are forced to the rated output voltage. This

current ﬂows into the sense pin and out of the ground pin. For the LT1129

(adjustable version) the sense pin is internally tied to the output pin.

Note 12: The LT1129 regulators are tested and speciﬁed under pulse load

conditions such that TJ ≅ TA. The LT1129C regulators are 100% tested at

TA = 25°C. For C-grade devices, Regulated Output Voltage, Line Regulation

and Load Regulation performance at –40°C and 125°C is assured by

design, characterization and correlation with statistical process controls.

The LT1129I regulators are guaranteed over the full –40°C to 125°C

operating junction temperature range. The LT1129MP regulators are 100%

tested and guaranteed over the –55°C to 125°C temperature range.

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: The shutdown pin input voltage rating is required for a low

impedance source. Internal protection devices connected to the shutdown

pin will turn on and clamp the pin to approximately 7V or – 0.6V. This

range allows the use of 5V logic devices to drive the pin directly. For high

impedance sources or logic running on supply voltages greater than 5.5V,

the maximum current driven into the shutdown pin must be limited to less

than 20mA.

Note 3: For junction temperatures greater than 110°C, a minimum load

of 1mA is recommended. For TJ > 110°C and IOUT < 1mA, output voltage

may increase by 1%.

Note 4: Operating conditions are limited by maximum junction

temperature. The regulated output voltage speciﬁcation will not apply

for all possible combinations of input voltage and output current. When

operating at maximum input voltage, the output current range must be

limited. When operating at maximum output current, the input voltage

range must be limited.

Note 5: The LT1129 is tested and speciﬁed with the adjust pin connected

to the output pin.

Note 6: Dropout voltage is the minimum input/output voltage required to

maintain regulation at the speciﬁed output current. In dropout the output

Guaranteed Dropout Voltage

Dropout Voltage

Quiescent Current

OUTPUT CURRENT (A)

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0.2

0.4

0.5

112935 G01

0.1

0.3

0.6

0.7

= TEST POINTS

TJ ≤ 125°C

TJ ≤ 25°C

TEMPERATURE (°C)

–50

0.7

0.6

0.5

0.4

0.3

0.2

0.1

112935 G02

–25

100

125

A. ILOAD = 700mA

B. ILOAD = 500mA

C. ILOAD = 300mA

D. ILOAD = 100mA

E. ILOAD = 10mA

TEMPERATURE (°C)

–50

112935 G03

–25

100

125

VSHDN = 0V

VSHDN = OPEN (HI)

TYPICAL PERFORMANCE CHARACTERISTICS

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