LM2772 datasheet(3/16 Pages) TI1

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LM2772

www.ti.com

SNVS486A – DECEMBER 2006 – REVISED MARCH 2007

Operating Ratings

(1) (2)

Input Voltage Range

2.7V to 5.5V

Recommended Load Current Range

0mA to 150mA

Junction Temperature (TJ) Range

-30°C to +110°C

Ambient Temperature (TA) Range

-30°C to +85°C

(3)

(1)

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

which operation of the device is guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed

performance limits and associated test conditions, see the Electrical Characteristics tables.

(2)

All voltages are with respect to the potential at the GND pins.

(3)

Maximum ambient temperature (TA-MAX) is dependent on the maximum operating junction temperature (TJ-MAX-OP = 110ºC), the

maximum power dissipation of the device in the application (PD-MAX), and the junction-to ambient thermal resistance of the part/package

in the application (

θJA), as given by the following equation: TA-MAX = TJ-MAX-OP – (θJA × PD-MAX).

Thermal Properties

Junction-to-Ambient Thermal

55°C/W

Resistance (

θJA), SON-10 Package

(1)

Junction-to-ambient thermal resistance is highly application and board-layout dependent. In applications where high maximum power

dissipation exists, special care must be paid to thermal dissipation issues.

Electrical Characteristics

(1) (2)

Limits in standard typeface are for TJ = 25ºC. Limits in boldface type apply over the full operating junction temperature range

(-30°C

≤ TJ ≤ +110°C) . Unless otherwise noted, specifications apply to the LM2772 Typical Application Circuit (pg. 1) with:

VIN = 3.6V; V(EN) = 1.8V, CIN = C1 = C2 = C3 = 1.0µF, COUT = 4.7µF.

(3)

Symbol

Parameter

Condition

Min

Typ

Max

Units

3.0V

≤ VIN ≤ 5.5V

1.164

1.236

1.2

0mA

≤ IOUT ≤ 150mA

(

−3%)

(+3%)

VOUT

1.2V Output Voltage Regulation

1.178

1.236

0mA

≤ IOUT ≤ 150mA

1.2

(

−1.8%)

(+3.0%)

VOUT/IOUT

Output Load Regulation

0mA

≤ IOUT ≤ 150mA

0.15

mV/mA

VOUT/VIN

Output Line Regulation

0.2

%/V

Power Efficiency

IOUT = 150mA

IOUT = 0mA

Quiescent Supply Current

µA

(4)

Fixed Frequency Output Ripple

40mA

≤ IOUT ≤ 150mA

VR–PFM

PFM–Mode Output Ripple

IOUT < 40mA

ISD

Shutdown Current

V(EN) = 0V

0.01

0.3

µA

FSW

Switching Frequency

3.0V

≤ VIN ≤ 5.5V

0.80

1.15

1.50

MHz

VIN = 5.5V

ICL

Output Current Limit

500

≤ VOUT ≤ 0.2V

tON

Turn-on Time

150

µs

VIL

Logic-low Input Voltage

3.0V

≤ VIN ≤ 5.5V

0.63

VIH

Logic-high Input Voltage

3.0V

≤ VIN ≤ 5.5V

1.1

VIN

V(EN) = 1.8V

IIH

Logic-high Input Current

µA

(5)

IIL

Logic-low Input Current

Logic Input = 0V

0.01

µA

(1)

All voltages are with respect to the potential at the GND pins.

(2)

Min and Max limits are guaranteed by design, test, or statistical analysis. Typical numbers are not guaranteed, but do represent the

most likely norm.

(3)

CIN, COUT, C1, C2, C3: Low-ESR Surface-Mount Ceramic Capacitors (MLCCs) used in setting electrical characteristics.

(4)

VOUT is set to 1.3V during this test (Device is not switching).

(5)

There is a 350k

Ω pull-down resistor connected internally between the EN pin and GND.

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