LP3905SD-30EV National Semiconductor, LP3905SD-30EV Datasheet - Page 6

• Manufacturer Part Number: LP3905SD-30EV
• Description: BOARD EVALUATION LP3905SD-30
• Manufacturer: National Semiconductor

Specifications of LP3905SD-30EV

• Main Purpose: DC/DC, Step Down with LDO
• Outputs And Type: 4, Non-Isolated
• Voltage - Output: 1.2V, 1.875, 2.8V, 2.8V
• Current - Output: 600mA, 600mA, 100mA, 100mA
• Voltage - Input: 3 ~ 5.5V
• Regulator Topology: Buck
• Frequency - Switching: 2MHz
• Board Type: Fully Populated
• Utilized Ic / Part: LP3905
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -

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Transient Characteristics (Note 15)
∆V
General Electrical Characteristics
LDO Regulator Electrical Characteristics
Symbol
The linear regulators have a current rating of I
Unless otherwise specified, limits are set with V
standard typeface are for T
+125˚C). Unless otherwise noted, specifications apply to the LP3905 Typical Application Circuit (Figure. 1)(Notes 2, 8)
Electrical Characteristics Notes
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the component may occur. Operating Ratings are conditions under which operation of
the device is guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions, see the
Electrical Characteristics tables.
Note 2: All voltages are with respect to the potential at the GND pin.
Note 3: Internal thermal shutdown circuitry protects the device from permanent damage.
Note 4: The Human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin. MIL-STD-883 3015.7
Note 5: In Applications where high power dissipation and/or poor package resistance is present, the maximum ambient temperature may have to be derated.
Maximum ambient temperature (T
the application (P
(θ
Note 6: Junction to ambient thermal resistance is highly dependent on board layout, PCB material environmental conditions and applications. In applications where
high power dissipation exists, special care must be given to thermal dissipation issues in board design. The use of thermal vias under the pad may be required. For
more on these topics, please refer to the Application Note: AN-1187: Leadless leadframe Package (LLP).
Note 7: V
Note 8: Min and Max limits are guaranteed by design, test or statistical analysis. Typical numbers are not guaranteed, but do represent the most likely norm.
Note 9: The parameters in the electrical characteristic table are tested at V
to datasheet curves.
Note 10: C
Note 11: The device maintains a stable, regulated output voltage without a load.
Note 12: Dropout voltage is the voltage difference between the input and the output at which the output voltage drops to 100 mV below its nominal value.
Note 13: Short Circuit Current is measured with V
Note 14: There is a 1 MΩ resistor between EN1,EN2 and ground on the device.
Note 15: This specification is guaranteed by design.
Note 16: For the adjustable version, feedback resistor values should be chosen for the divider network to ensure that at the desired output voltage the feedback
pin is at 0.5V. See Buck Converter Applications Information.
OUT
JA
x P
D-MAX
IN1
IN
).
, C
and V
Line Transient (Note 15)
Load Transient (Note 15)
Overshoot on Startup
OUT
D-MAX
IN2
: Low-ESR Surface-Mount Ceramic Capacitors (MLCCs) used in setting electrical characteristics.
) and the junction to ambient thermal resistance of the package (θ
should be tied together at all times for proper Power Up
Parameter
A-MAX
J
= 25˚C. Limits in boldface type apply over the full junction temperature range (−40˚C ≤ T
) is dependent on the maximum operating junction temperature (T
OUT
pulled to 0v and V
max
IN
= 150mA with C
= 3.8V, V
V
(V
mA
V
(V
1mA
I
I
I
C
I
C
(Note 15)
OUT
OUT
OUT
OUT
IN
IN
OUT
OUT
OUT(NOM
OUT(NOM
= (V
= (V
= 1mA to 100mA in 10µs
= 100mA to 1mA in 10µs
= 1mA to 150mA in 10µs
= 150mA to 1mA in 10µs
(Notes 2, 8, 9) (Continued)
= 1.0µF
= 1.0µF
IN
IN
OUT(NOM
OUT(NOM
EN1/2
worst case = 5,5V.
= 3.8V unless otherwise specified. For performance over the input voltage range refer
) + 1.6V) in 10µs, I
) + 1.0V) in 10µs, I
6
Conditions
= 3.8V, C
OUT
) + 1.0V) to
) + 1.6V) to
JA
(Continued)
= 1.0µF. A 100mA rating applies with C
) in the application, as given by the following equation:T
IN
= 1µF, C
OUT
OUT
J-MAX
= 1
=
OUT
), the maximum power dissipation of the device in
= 0.47µF, I
-100
Min
-70
6
OUT
Typ
= 1.0mA. Limits in
OUT
Max
30
35
20
A-MAX
= 0.47µF.
6
J
= T
≤
J-MAX
Units
mV
mV
mV
−