LM3686_14 datasheet(6/28 Pages) TI1

Part #	LM3686

Description	Step-Down DC-DC Converter with Integrated Post Linear Regulators System and Low-Noise Linear Regulator

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Manufacturer	TI1 [Texas Instruments]

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LM3686

SNVS520D – AUGUST 2008 – REVISED MARCH 2011

www.ti.com

Electrical Characteristics

(1) (2) (3) (4) Linear Regulator — LILO (EN_DCDC = EN_LILO = ON -

Large NMOS)

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

temperature range: -40°C

≤ TA= TJ ≤ +85°C. Unless otherwise noted, specifications apply to the closed loop typical

application circuits (linear regulator) with VIN_LDO = VBATT = 3.6V

(5) , V

IN_LILO = VOUT_DCDC(NOM), VEN (All) = VBATT, CIN_DC = 4.7 µF,

COUT_LILO = 2.2 µF, CIN_LDO = 1.0 µF , COUT_LDO = 1.0 µF ,COUT_DC = C IN_LILO = 10 µF

Limits

Symbol

Parameter

Condition

Units

Min

Typ

Max

ΔVOUT_LILO /

Output Voltage

IOUT_LILO = 1 mA to 350 mA

1.2

VOUT_LILO

Accuracy,

VIN_LILO = VOUT_DCDC

1.176

1.224

V

VOUT_LILO

VBATT = 3.6V

IOUT_LILO = 1 mA & 350 mA

4

12

µV/mA

ΔVOUT_LILO / ΔmA Load Regulation

(6)

VIN_LILO = VOUT_DCDC

VBATT = 3.6V

VBATT = VOUT_LILO + 1.5V

50

80

mV

(VIN_LILO disconnected from

VDROP

Dropout Voltage (7)

VOUT_DCDC),

IOUT = 350 mA

IQ_VIN_LILO

Quiescent Current

VBATT = VIN_LILO = 3.6V

70

90

µA

ISC_LILO

Short Circuit Current

VOUT = GND (VOUT_LILO = 0 )

400

mA

Limit

LILO (EN_DCDC = OFF, EN_LILO = ON - SMALL NMOS)

ΔVOUT_LILO /

Output Voltage

IOUT = 1 mA to 50 mA

1.176

1.224

VOUT_LILO

Accuracy,

V

VOUT_LILO

ΔVOUT_LILO /

Line Regulation

VIN_LILO = (VOUT_LILO + 0.3V) to 5.5V

0.4

1.5

mV/V

ΔVBATT

(Small NMOS) (8)

ISC_LILO

Short circuit current

VOUT_LILO = GND

70

mA

TSTARTUP

Start up time

EN to 0.95VOUT

70

µS

System Characteristic(9)

PSRR

Signal to VBATT = 3.6V,

VIN_LILO = 1.8V

68

IOUT = 200 mA,

Power Supply Rejection

f = 100 Hz

dB

Ratio(10)

Signal to VIN_LILO = 1.8V

IOUT = 200 mA,

60

f = 1kHz

eN_LILO

BW = 10 Hz to 100 kHz,

VIN_LILO = 1.8V,

Output Noise voltage(10)

166

µVRMS

IOUT = 200 mA,

VIN_LDO = 3.6V

ΔVOUT_LILO

Dynamic load transient

Pulsed load 1 mA - 350 mA

+/- 30

mV

response

di/dt = 350 mA/1µS

(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 (typ.) numbers are not guaranteed, but do represent

the most likely norm. Unless otherwise specified, conditions for typ. specifications are: VBATT = 3.6V and TA = 25°C.

(3)

The parameters in the electrical characteristic table are tested at VBATT = 3.6V unless otherwise specified. For performance over the

input voltage range refer to datasheet curves.

(4)

The input voltage range recommended for ideal applications performance for the specified output voltages is given below:VBATT = 2.7V

to 5.5V for 1.0V

≤ VOUT_DCDC < 1.8VVBATT = (VOUT_DCDC + 1V) to 5.5V for 1.8V ≤ VOUT_DCDC < 3.6V

(5)

VIN_LDO must be ON at all time for biasing internal reference circuits

(6)

To calculate the output voltage from the load regulation specified, use the following equation:

ΔVOUT = Load Regulation (%/mA) x

Nominal VOUT (V) x ΔIOUT (mA).

(7)

Dropout voltage is defined as the input to output voltage differential at which the output voltage falls to 100 mV below the nominal output

voltage.

(8)

To calculate the output voltage from the line regulation specified, use the following equation:

ΔVOUT = Line Regulation (%/V) x Nominal

VOUT (V) x ΔVIN (V).

(9)

Parameters guaranteed by design.

(10) The noise performance target is applied to PWM mode operation and this does not apply when DCDC converter is operating in PFM

mode.

6

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