Datasheet

LP3906
www.ti.com SNVS456M –AUGUST 2006–REVISED MAY 2013
OPERATING RATINGS
(1)(2)(3)
Bucks
V
IN
2.7V to 5.5V
V
EN
0 to (V
IN
+ 0.3V)
Junction Temperature (T
J
) Range −40°C to +125°C
Ambient Temperature (T
A
) Range
(4)
−40°C to +85°C
Thermal Properties
(5)(6) (4)
Junction-to-Ambient Thermal Resistance
(θ
JA
)NHZ0024B 28°C/W
(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 specified. Operating Ratings do not imply specified performance limits. For specified performance limits
and associated test conditions, see the Electrical Characteristics.
(2) All voltages are with respect to the potential at the GND pin.
(3) Min and Max limits are ensured by design, test, or statistical analysis. Typical numbers are not specifications, but do represent the most
likely norm.
(4) Junction-to-ambient thermal resistance is highly application and board-layout dependent. In applications where high maximum power
dissipation exists, special care must be paid to thermal dissipation issues in board design.
(5) Internal thermal shutdown circuitry protects the device from permanent damage. Thermal shutdown engages at T
J
= 160°C (typ.) and
disengages at T
J
= 140°C (typ.)
(6) In applications where high power dissipation and/or poor package thermal resistance is present, the maximum ambient temperature may
have to be derated. Maximum ambient temperature (T
A-MAX
) is dependent on the maximum operating junction temperature (T
J-MAX-OP
=
125°C), the maximum power dissipation of the device in the application (P
D-MAX
), and the junction-to-ambient thermal resistance of the
part/package in the application (θ
JA
), as given by the following equation: T
A-MAX
= T
J-MAX-OP
− (θ
JA
× P
D-MAX
). See APPLICATION
NOTES.
GENERAL ELECTRICAL CHARACTERISTICS
(1)(2)(3)(4)
Unless otherwise noted, V
IN
= 3.6V, Typical values and limits appearing in normal type apply for T
J
= 25°C. Limits appearing
in boldface type apply over the entire junction temperature range for operation, −40°C to +125°C.
Parameter Test Conditions Min Typ Max Units
V
POR
Power-On Reset Threshold V
DD
Falling Edge 1.9 V
T
SD
Thermal Shutdown Threshold 160 °C
T
SDH
Themal Shutdown Hysteresis 20 °C
(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 specified. Operating Ratings do not imply specified performance limits. For specified performance limits
and associated test conditions, see the Electrical Characteristics.
(2) All voltages are with respect to the potential at the GND pin.
(3) Min and Max limits are specified by design, test, or statistical analysis. Typical numbers are not specified, but do represent the most
likely norm.
(4) This specification is ensured by design.
I
2
C COMPATIBLE INTERFACE ELECTRICAL SPECIFICATIONS
(1)
Unless otherwise noted, V
IN
= 3.6V. Typical values and limits appearing in normal type apply for T
J
= 25°C. Limits appearing
in boldface type apply over the entire junction temperature range for operation, −40°C to +125°C
Parameter Test Conditions Min Typ Max Units
F
CLK
Clock Frequency 400 kHz
t
BF
Bus-Free Time Between Start and Stop See
(1)
1.3 µs
t
HOLD
Hold Time Repeated Start Condition See
(1)
0.6 µs
t
CLKLP
CLK Low Period See
(1)
1.3 µs
t
CLKHP
CLK High Period See
(1)
0.6 µs
t
SU
Set Up Time Repeated Start Condition See
(1)
0.6 µs
t
DATAHLD
Data Hold time See
(1)
0 µs
t
DATASU
Data Set Up Time See
(1)
100 ns
T
SU
Set Up Time for Start Condition See
(1)
0.6 µs
T
TRANS
Maximum Pulse Width of Spikes that See
(1)
Must be Suppressed by the Input Filter of 50 ns
Both DATA & CLK Signals.
(1) This specification is ensured by design.
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