Datasheet

LM3243
www.ti.com SNVS782B –OCTOBER 2010–REVISED FEBRUARY 2013
SYSTEM CHARACTERISTICS
The following spec table entries are specified by design and verifications providing the component values in the Typical
Application Circuit are used (L = 1.5 µH, DCR = 120 mΩ, TOKO DFE201610C-1R5N, C
IN
= 10 µF, 6.3V, 0402, Samsung
CL05A106MQ5NUN, C
OUT
= 10 µF + 4.7 µF + 3 x 1.0 µF + 3300 pF: 6.3V, 0402, Samsung CL05A106MQ5NUN,
CL05A475MQNRN; 6.3V, 0201 Samsung CL03A105MQ3CSN; 6.3V, 01005 Murata GRM022R60J332K). These parameters
are not verified by production testing. Min and Max values are specified over the ambient temperature range T
A
= −30°C
to 90°C. Typical values are specified at PVIN = VDD = EN = 3.8V, BP = 0V and T
A
= 25°C unless otherwise stated.
Symbol Parameter Conditions Min Typ Max Units
Time for SW pin to become
T
SETUP
EN = LOW-to-HIGH 30
active upon power-up
Turn-on time (time for output
µs
EN = LOW-to-HIGH, V
IN
= 4.2V,
to reach 90% of final value
T
ON
VCON = 1.36V, V
OUT
= 3.4V, I
OUT
≤ 50
after EN LOW-to-HIGH
1mA
transition)
V
IN
= 4.2V
Time for V
OUT
to rise from 0V
R
LOAD
= 6.8Ω,
to 3V (90% or 2.7V)
VCON = 0V to 1.2V
20
Time for V
OUT
to fall from V
IN
= 4.2V, R
LOAD
= 6.8Ω,
3.6V to 2.6V (10% or 2.7V) VCON = 1.44V to 1.04V
Time for V
OUT
to rise from V
IN
= 4.2V, R
LOAD
= 1.9Ω,
1.8V to 2.8V (90% or 2.7V) VCON = 0.72V to 1.12V
T
RESPONSE
µs
15
Time for V
OUT
to fall from V
IN
= 4.2V, R
LOAD
= 1.9Ω, VCON =
2.8V to 1.8V (10% or 1.9V) 1.12V to 0.72V
Time for V
OUT
to rise from 0V V
IN
= 4.2V, R
LOAD
= 1.9Ω,
to 3.4V (90% or 3.1V) VCON = 0V to 1.36V
20
Time for V
OUT
to fall from V
IN
= 4.2V, R
LOAD
= 1.9Ω, VCON =
3.4V to 0.4V (10% or 0.7V) 1.36V to 0.16V
Time for V
OUT
to rise from 0V
T
Bypass
to PVIN after BP LOW-to- VCON = 0V, I
OUT
≤ 1mA 20
HIGH transition (90%)
µs
Bypass turn-on time. Time for
V
OUT
to rise from 0V to PVIN
T
Bypass, ON
EN = V
IN
= 3.8V, I
OUT
≤ 1mA 50
after EN LOW-to-HIGH
transition (90% or 3.24)
VCON = 1.5V, Max value at V
IN
=
Total dropout resistance in
R
tot_drop
3.1V, 45 55 mΩ
bypass mode
Inductor ESR ≤ 151 mΩ
Pin input capacitance for BP,
C
IN
Test frequency = 100 KHz 5 pF
EN, MODE
Maximum load current in
I
OUT
Switcher + ACB 2.5
PWM mode
Maximum output transient
I
OUT, PU
3.0 A
pullup current limit
Switcher + ACB
(1)
PWM maximum output
I
OUT, PD, PWM
−3.0
transient pulldown current limit
Maximum output load current V
IN
= 3.8V, VCON < 1.0
I
OUT, MAX-PFM
85 mA
in PFM mode MODE = HIGH
(1)
−3 +3 %
Linearity in control range of V
IN
= 4.2V
(2)
Linearity
VCON = 0.16V to 1.44V Monotonic in nature
−50 +50 mV
(1) Current limit is built-in, fixed, and not adjustable.
(2) Linearity limits are ±3% or ±50 mV, whichever is larger.
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