LM3691 datasheet(3/23 Pages) TI1

Numer części	LM3691

Szczegółowy opis	High Accuracy, Miniature 1A, Step-Down DC-DC Converter for Portable

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Producent	TI1 [Texas Instruments]

Strona internetowa	http://www.ti.com

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LM3691

www.ti.com

SNVS506H – MAY 2008 – REVISED SEPTEMBER 2011

Operating Ratings

(1) (2)

Input Voltage Range

2.3V to 5.5V

Recommended Load Current

0 mA to 1000 mA

Junction Temperature (TJ) Range

−30°C to +125°C

Ambient Temperature (TA) Range

(3)

−30°C to +85°C

(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 pin.

(3)

In applications where high power dissipation and/or poor package resistance is present, the maximum ambient temperature may have to

be derated. Maximum ambient temperature (TA-MAX) is dependent on the maximum operating junction temperature (TJ-MAX), the

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

in the application, as given by the following equation: TA-MAX = TJ-MAX− (θJAx PD-MAX). Due to the pulsed nature of testing the part, the

temp in the Electrical Characteristic table is specified as TA = TJ.

Thermal Properties

Junction-to-Ambient Thermal Resistance (

θJA)

(1) (DSBGA)

85°C/W

(1)

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

exists, special care must be given to thermal dissipation issues in board design.

Electrical Characteristics

(1) (2) (3)

Limits in standard typeface are for TA = 25°C. Limits in boldface type apply over the operating ambient temperature range

(

−30°C ≤ TA= TJ ≤ +85°C). Unless otherwise noted, specifications apply to the LM3691 open loop Typical Application Circuit

with VIN = EN = 3.6V.

Parameter

Test Conditions

Min

Typ

Max

Units

VFB

Feedback Voltage

PWM Mode. No load VOUT = 1.1V to 3.3V

-1

+1

%

PWM Mode. No load VOUT = 0.75V to 1.0V

-10

+10

mV

ISHDN

Shutdown Supply Current

EN = 0V

0.03

1

µA

IQ_ECO

ECO Mode Iq

ECO Mode

64

80

µA

IQ_PWM

PWM Mode Iq

PWM Mode

490

600

µA

RDSON (P)

Pin-Pin Resistance for PFET

VIN = VGS = 3.6V, IO = 200 mA

160

250

m

Ω

RDSON (N)

Pin-Pin Resistance for NFET

VIN = VGS = 3.6V, IO = −200 mA

115

180

m

Ω

ILIM

Switch Peak Current Limit

Open loop

1250

1500

1700

mA

VIH

Logic High Input

1.2

V

VIL

Logic Low Input

0.4

V

IEN,MODE

Input Current

0.01

1

µA

FSW

Switching Frequency

PWM Mode

3.6

4

4.4

MHz

VON

UVLO threshold (4)

VIN rising

2.2

2.29

V

VIN falling

2.1

V

TSTARTUP

Start Time (5)

70

145

300

µs

(1)

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

(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)

The parameters in the electrical characteristic table are tested under open loop conditions at VIN = 3.6V unless otherwise specified. For

performance over the input voltage range and closed loop condition, refer to the datasheet curves.

(4)

The UVLO rising threshold minus the falling threshold is always positive.

(5)

Not tested in production, guaranteed by design.

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