Datasheet

LM3243
SNVS782B –OCTOBER 2010–REVISED FEBRUARY 2013 www.ti.com
ELECTRICAL CHARACTERISTICS
(1) (2) (3)
Limits in standard typeface are for T
A
= T
J
= 25°C. Limits in boldface type apply over the full operating ambient temperature
range (−30°C ≤ T
A
= T
J
≤ +90°C). Unless otherwise noted, all specifications apply to the Typical System Application Diagram
(page 2) with: PVIN = VDD = EN = 3.8V, BP = 0V.
Symbol Parameter Conditions Min Typ Max Units
Feedback voltage at low VCON = 0.16V, MODE = LOW
V
FB, LOW
0.350 0.400 0.450 V
setting
(3)
Feedback voltage at high VCON = 1.44V, V
IN
= 3.9V,
V
FB, HIGH
3.492 3.6 3.708 V
setting MODE = LOW
(3)
I
SHDN
Shutdown supply current EN = SW = VCON = 0V
(4)
0.02 4 µA
No switching
(5)
I
q_PFM
DC bias current into VDD 260 310
MODE = HIGH
µA
No Switching
(5)
I
q_PWM
DC bias current into VDD 975 1100
MODE = LOW
Positive transient peak current
I
LIM,PFET, Transient
VCON = 0.6V
(6)
1.9 2.1 A
limit
I
LIM,PFET,Steady
Positive steady state peak VACB = 3.05V
1.34 1.45 1.65 A
State
current limit VCON = 0.6V
(6)
Positive active current assist VCON = 0.6V, VACB = 2.8V
I
LIM, P_ACB
1.40 1.70 2.00 A
peak current limit
(6)
NFET Switch negative peak
I
LIM, NFET
VCON = 1.0V
(6)
−1.69 −1.50 −1.31 A
current limit
Average Internal oscillator
F
OSC
VCON = 1.0V 2.43 2.70 2.97 MHz
frequency
V
IH
Logic HIGH input threshold BP, EN, MODE 1.2
V
V
IL
Logic LOW input threshold BP, EN, MODE 0.5
I
EN
EN pin pulldown current EN = 3.6V 0 5 10
I
IN
Pin input current BP, MODE −1 1 µA
I
VCON
VCON pin leakage current VCON = 1.0V −1 1
Gain VCON to V
OUT
Gain 0.16V ≤ VCON ≤ 1.44V
(7)
2.5 V/V
(1) All voltages are with respect to the potential at the GND pins. The LM3243 is designed for mobile phone applications where turn-on after
power-up is controlled by the system controller and where requirements for a small package size overrule increased die size for internal
Under Voltage Lock-Out (UVLO) circuitry. Thus, it should be kept in shutdown by holding the EN pin LOW until the input voltage
exceeds 2.7V.
(2) Min and Max limits are specified by design, test, or statistical analysis.
(3) The parameters in the electrical characteristics table are tested under open loop conditions at PVIN = VDD = 3.8V. For performance
over the input voltage range and closed-loop results, refer to the datasheet curves.
(4) Shutdown current includes leakage current of PFET.
(5) I
q
specified here is when the part is not switching. For operating input current at no load, refer to datasheet curves.
(6) Current limit is built-in, fixed, and not adjustable.
(7) Linearity limits are ±3% or ±50 mV, whichever is larger.
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