Datasheet

LM2750
SNVS180L –APRIL 2002–REVISED MAY 2013 www.ti.com
Thermal Information
Junction-to-Ambient Thermal Resistance, WSON-10 Package (θ
JA
)
(1)
55°C/W
(1) Junction-to-ambient thermal resistance (θ
JA
) is taken from a thermal modeling result, performed under the conditions and guidelines set
forth in the JEDEC standard JESD51-7. The test board is a 4 layer FR-4 board measuring 102mm x 76mm x 1.6mm with a 2 x 1 array
of thermal vias. The ground plane on the board is 50mm x 50mm. Thickness of copper layers are 36µm/18µm
/18µm/36µm(1.5oz/1oz/1oz/1.5oz). Ambient temperature in simulation is 22°C, still air. Power dissipation is 1W. The value of θ
JA
of the
LM2750 in WSON-10 could fall in a range as wide as 50ºC/W to 150ºC/W (if not wider), depending on PCB material, layout, and
environmental conditions. In applications where high maximum power dissipation exists (high V
IN
, high I
OUT
), special care must be paid
to thermal dissipation issues. For more information on these topics, see TI's AN-1187 Application Report (SNOA401) and the LAYOUT
RECOMMENDATIONS section of this datasheet.
Electrical Characteristics
(1) (2)
Typical values and limits in standard typeface apply for T
J
= 25ºC. Limits in boldface type apply over the operating junction
temperature range. Unless otherwise specified: 2.9V ≤ V
IN
≤ 5.6V, V
OUT
= 5.0V (LM2750-ADJ), V(SD) = V
IN
, C
FLY
= 1µF, C
IN
=
2 x 1µF, C
OUT
= 2 x 1µF
(3)
.
Symbol Parameter Conditions Min Typ Max Units
2.9V ≤ V
IN
≤ 5.6V, 4.80 5.0 5.20
I
OUT
≤ 120mA (-4%) (+4%)
Output Voltage V
V
OUT
(LM2750-5.0) (%)
2.7V ≤ V
IN
≤ 2.9V, 4.80 5.0 5.20
I
OUT
≤ 40mA (-4%) (+4%)
I
Q
Operating Supply Current I
OUT
= 0mA, 5 10 mA
V
IH(MIN)
≤ V(SD) ≤V
IN
12
I
SD
Shutdown Supply Current V(SD) = 0V 2 µA
V
FB
Feedback Pin Voltage (LM2750- V
IN
= 3.1V 1.170 1.232 1.294 V
ADJ)
I
FB
Feedback Pin Input Current V
FB
= 1.4V 1 nA
(LM2750-ADJ)
V
R
Output Ripple C
OUT
= 10µF, I
OUT
= 100mA 4
mVp-p
C
OUT
= 2.2µF, I
OUT
= 100mA 15
E
PEAK
Peak Efficiency V
IN
= 2.7V, I
OUT
= 40mA 87 %
(LM2750-5.0)
V
IN
= 2.9V, I
OUT
= 120mA 85
E
AVG
Average Efficiency over Li-Ion Input V
IN
Range: 2.9V - 4.2V, 70 %
Range I
OUT
= 120mA
(LM2750-5.0)
(4)
V
IN
Range: 2.9V - 4.2V, 67
I
OUT
= 40mA
f
SW
Switching Frequency 1.0 1.7 MHz
t
ON
V
OUT
Turn-On Time V
IN
= 3.0V, I
OUT
= 100mA, 0.5 ms
(5)
I
LIM
Current Limit V
OUT
shorted to GND 300 mA
Shutdown Pin (SD) Characteristics
V
IH
Logic-High SD Input 1.3 V
IN
V
V
IL
Logic-Low SD Input 0 0.4 V
I
IH
SD Input Current
(6)
1.3V ≤ V(SD) ≤ V
IN
15 50 µA
I
IL
SD Input Current V(SD) = 0V −1 1 µA
(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 numbers represent the most likely norm.
(3) C
FLY
, C
IN
, and C
OUT
: Low-ESR Surface-Mount Ceramic Capacitors (MLCCs) used in setting electrical characteristics
(4) Efficiency is measured versus V
IN
, with V
IN
being swept in small increments from 3.0V to 4.2V. The average is calculated from these
measurements results. Weighting to account for battery voltage discharge characteristics (V
BAT
vs. Time) is not done in computing the
average.
(5) Turn-on time is measured from when SD signal is pulled high until the output voltage crosses 90% of its final value.
(6) SD Input Current (I
IH
) is due to a 200kΩ (typ.) pull-down resistor connected internally between the SD pin and GND.
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