LM3243 datasheet(7/32 Pages) TI1

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LM3243

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SNVS782C – OCTOBER 2010 – REVISED AUGUST 2015

System Characteristics (continued)

The following spec table entries are specified by design and verifications providing the component values in the Typical

System Application Diagram are used (L = 1.5 µH, DCR = 120 m

Ω, TOKO DFE201610C-1R5N, CIN = 10 µF, 6.3 V, 0402,

Samsung CL05A106MQ5NUN, COUT = 10 µF + 4.7 µF + 3 × 1 µF + 3300 pF: 6.3 V, 0402, Samsung CL05A106MQ5NUN,

CL05A475MQNRN; 6.3 V, 0201 Samsung CL03A105MQ3CSN; 6.3 V, 01005 Murata GRM022R60J332K). These parameters

are not verified by production testing. Minimum (MIN) and maximum (MAX) values are specified over the ambient

temperature range TA = −30°C to 90°C. Typical (TYP) values are specified at PVIN = VDD = EN = 3.8 V, BP = 0 V and TA =

25°C unless otherwise stated.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

VOUT = 3 V, TR = TF = 10 µs

Load_tr

Load transient response

IOUT = 0 A to 1.2 A

mVpk

MODE = LOW

Maximum Duty

Maximum duty cycle

MODE = LOW

100%

Cycle

VIN = 3.2 V, VOUT = 1 V

100

160

IOUT = 10 mA, MODE = HIGH

PFM_Freq

Minimum PFM frequency

kHz

VIN = 3.2 V, VOUT = 0.5 V

IOUT = 5 mA, MODE = HIGH

6.7 Timing Requirements

MIN

MAX

UNIT

tSETUP

Time for SW pin to become active upon power up; EN = LOW-to-HIGH

µs

Turnon time (time for output to reach 90% of final value after EN LOW-to-HIGH

tON

transition)

µs

EN = LOW-to-HIGH, VIN = 4.2 V, VCON = 1.36 V, VOUT = 3.4 V, IOUT ≤ 1 mA

Time for VOUT to rise from 0 V to 3 V (90% or 2.7 V);

VIN = 4.2 V, RLOAD = 6.8 Ω, VCON = 0 V to 1.2 V

Time for VOUT to fall from 3.6 V to 2.6 V (10% or 2.7 V)

VIN = 4.2 V, RLOAD = 6.8 Ω, VCON = 1.44 V to 1.04 V

Time for VOUT to rise from 1.8 V to 2.8 V (90% or 2.7 V)

VIN = 4.2 V, RLOAD = 1.9 Ω, VCON = 0.72 V to 1.12 V

tRESPONSE

µs

Time for VOUT to fall from 2.8 V to 1.8 V (10% or 1.9 V)

VIN = 4.2 V, RLOAD = 1.9 Ω, VCON = 1.12 V to 0.72 V

Time for VOUT to rise from 0 V to 3.4 V (90% or 3.1 V)

VIN = 4.2 V, RLOAD = 1.9 Ω, VCON = 0 V to 1.36 V

Time for VOUT to fall from 3.4 V to 0.4 V (10% or 0.7 V)

VIN = 4.2 V, RLOAD = 1.9 Ω, VCON = 1.36 V to 0.16 V

Time for VOUT to rise from 0 V to PVIN after BP LOW-to-HIGH transition (90%)

tBypass

µs

VCON = 0 V, IOUT ≤ 1 mA

Bypass turnon time. Time for VOUT to rise from 0 V to PVIN after EN LOW-to-

tBypass, ON

HIGH transition (90% or 3.24)

µs

EN = VIN= 3.8 V, IOUT ≤ 1 mA

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