Datasheet
LM27341, LM27342, LM27341-Q1, LM27342-Q1
SNVS497E –NOVEMBER 2008–REVISED APRIL 2013
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Electrical Characteristics
Specifications with standard typeface are for T
J
= 25°C, and those in boldface type apply over the full Operating
Temperature Range (T
J
= -40°C to 125°C). V
IN
= 12V, and V
BOOST
- V
SW
= 4.3V unless otherwise specified. Datasheet
min/max specification limits are ensured by design, test, or statistical analysis.
Symbol Parameter Conditions Min Typ Max Units
SYSTEM PARAMETERS
T
J
= 0°C to 85°C 0.990 1.0 1.010
V
FB
Feedback Voltage V
T
J
= -40°C to 125°C 0.984 1.0 1.014
Feedback Voltage Line
ΔV
FB
/ΔV
IN
V
IN
= 3V to 20V 0.003 % / V
Regulation
I
FB
Feedback Input Bias Current 20 100 nA
Over Voltage Protection, V
FB
at
OVP 1.13 V
which PWM Halts.
Undervoltage Lockout V
IN
Rising until V
SW
is Switching 2.60 2.75 2.90
UVLO V
UVLO Hysteresis V
IN
Falling from UVLO 0.30 0.47 0.6
SS Soft Start Time 0.5 1 1.5 ms
Quiescent Current, I
Q
= I
Q_AVIN
+
V
FB
= 1.1 (not switching) 2.4 mA
I
Q_PVIN
I
Q
Quiescent Current, I
Q
= I
Q_AVIN
+
V
EN
= 0V (shutdown) 70 nA
I
Q_PVIN
f
SW
= 2 MHz 8.2 10
I
BOOST
Boost Pin Current mA
f
SW
= 1 MHz 4.4 6
OSCILLATOR
f
SW
Switching Frequency SYNC = GND 1.75 2 2.3 MHz
FB Pin Voltage where SYNC input
V
FB_FOLD
0.53 V
is overridden.
f
FOLD_MIN
Frequency Foldback Minimum V
FB
= 0V 220 250 kHz
LOGIC INPUTS (EN, SYNC)
f
SYNC
SYNC Frequency Range 1 2.35 MHz
V
IL
EN, SYNC Logic low threshold Logic Falling Edge 0.4
V
V
IH
EN, SYNC Logic high threshold Logic Rising Edge 1.8
SYNC, Time Required above V
IH
t
SYNC_HIGH
100 ns
to Ensure a Logical High.
SYNC, Time Required below V
IL
t
SYNC_LOW
100 ns
to Ensure a Logical Low.
I
SYNC
SYNC Pin Current V
SYNC
< 5V 20 nA
V
EN
= 3V 6 15
I
EN
Enable Pin Current µA
V
IN
= V
EN
= 20V 50 100
INTERNAL MOSFET
R
DS(ON)
Switch ON Resistance 150 320 mΩ
I
CL
Switch Current Limit LM27342 2.5 4.0
A
LM27341 2.0 3.7
D
MAX
Maximum Duty Cycle SYNC = GND 85 93 %
t
MIN
Minimum on time 65 ns
I
SW
Switch Leakage Current 40 nA
BOOST LDO
V
LDO
Boost LDO Output Voltage 3.9 V
THERMAL
T
SHDN
Thermal Shutdown Temperature Junction temperature rising 165 °C
Thermal Shutdown Hysteresis Junction temperature falling 15 °C
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