LM3686 datasheet(7/27 Pages) TI

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LM3686

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SNVS520E – AUGUST 2008 – REVISED MAY 2013

Electrical Characteristics

Linear Regulator — LILO (EN_DCDC = EN_LILO = ON - Large NMOS)

(1)(2)(3)(4) (continued)

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

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,

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

TSTARTUP

Start up time

EN to 0.95VOUT

µS

System Characteristic(9)

PSRR

Signal to VBATT = 3.6V,

VIN_LILO = 1.8V

IOUT = 200 mA,

Power Supply Rejection

f = 100 Hz

Ratio(10)

Signal to VIN_LILO = 1.8V

IOUT = 200 mA,

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(11)

response

di/dt = 350 mA/1µS

ΔVIN_LILO

Dynamic line transient

VBATT = 3.1V to 3.7V

response on VBATT

VIN_LILO = VOUT_DCDC

+/-15(11)

tr, tf = 10 µS, IOUT = 200 mA

(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)

Specified by design. Not production tested.

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

mode.

(11) For line and load transient specifications, the + symbol represents an overshoot in the output voltage and the – symbol represents an

undershoot in the output voltage. The first value signifies overshoot or undershoot at the rising edge and the second value signifies the

overshoot or undershoot at the falling edge.

Electrical Characteristics

Linear Regulator — LDO

(1) (2) (3) (4)

Typical Limit

Symbol

Parameter

Conditions

Units

Min

Typ

Max

VIN_LDO

LDO input voltage range

2.7

5.5

Output voltage

2.744

2.8

2.856

ΔVOUT_LDO/VOUT_

VIN = 3.6V

accuracy,

LDO

IOUT_LDO = 1 mA & 300 mA

2.94

3.0

3.06

VOUT_LDO

ΔVOUT_LDO/ΔmA

Load regulation(5)

IOUT_LDO = 1 mA & 300 mA

µV/mA

(1)

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

(2)

Min and Max limits are specified by design, test, or statistical analysis. Typical (typ.) numbers 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)

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).

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