LM3686 datasheet(9/27 Pages) TI

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LM3686

www.ti.com

SNVS520E – AUGUST 2008 – REVISED MAY 2013

Electrical Characteristics

DC-DC Converter

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

Limit

Symbol

Parameter

Conditions

Units

Min

Typ

Max

VFB_DCDC

Feedback Voltage

PWM Mode(5)

1.8

1.746

1.836

Accuracy

VREF

Internal reference

0.5

voltage

RDSON(P)

Pin-Pin Resistance for

VBATT = 3.6V

350

450

Ω

PFET

ISW = 100 mA

RDSON(N)

Pin-Pin Resistance for

VBATT = 3.6V

150

250

Ω

NFET

ISW = 100 mA

IQ_AUTO

Quiescent current for

No load, device is not switching, FB = HIGH

µA

auto mode

ILIM

Switch peak current

Open loop

1.035

1.220

1.375

limit

FOSC

Internal Oscillator

PWM Mode

2.4

3.4

MHz

Frequency

(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)

Electrical Characteristic table reflects open loop data (FB = 0V and current drawn from SW pin ramped up until cycle by cycle current

limit is activated). Closed loop current limit is the peak inductor current measured in the application circuit by increasing output current

until output voltage drops by 10%.

Electrical Characteristics

Global Parameters (DCDC, LILO, & LDO)

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

Typical Limit

Symbol

Parameter

Conditions

Units

Min

Typ

Max

Full power mode

IOUT_DCDC = IOUT_LILO = IOUT_LDO = 0 mA, DC-DC

Quiescent current into

IQ_VBATT

is not switching (FB_DCDC forced higher than

100

130

µA

VBATT

VOUT_DCDC)

Ven = 1.1V,

Shutdown current into

VEN_DCDC = VEN_LILO = VEN_LDO = 0V

IQ_GLOBAL

2.5

µA

VBATT

Enable Pins (EN_DCDC, EN_LILO, EN_LDO)

IEN

Enable pin input

All EN = 0V

.01

µA

current

VIH

Logic high input

1.1

VIL

Logic low input

0.40

(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

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