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LM3678 Datenblatt(PDF) 4 Page - Texas Instruments

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Teilenummer LM3678
Bauteilbeschribung  High-Performance Miniature 1.5-A Step-Down DC-DC Converter for Handheld Applications
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Hersteller  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

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LM3678
SNVS464C – APRIL 2008 – REVISED MAY 2013
www.ti.com
Operating Ratings
(1) (2)
Input Voltage Range
2.5V to 5.5V
Recommended Load Current
0mA to 1.5A
Junction Temperature (TJ) Range
−30°C to +125°C
Ambient Temperature (TA) Range
(3)
−30°C to +85°C
(1)
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings are conditions under
which the device operates. 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)
In applications with high power dissipation or poor package resistance, the maximum ambient temperature may need to be derated.
Maximum ambient temperature (TA-MAX) is dependent on the maximum operating junction temperature (TJ-MAX), the maximum power
dissipation of the device in the application (PD-MAX) and the junction to ambient thermal resistance of the package (θJA) in the
application, as given by the following equation: TA-MAX= TJ-MAX− (θJAx PD-MAX).
Thermal Properties
Junction-to-Ambient Thermal Resistance (
θJA) (DSC-10) for 4-layer board
(1)
49.8°C/W
(1)
Junction-to-ambient thermal resistance is highly application and board layout dependent. In applications where high power dissipation
exists, special care must be given to thermal dissipation issues in board design.
Electrical Characteristics
(1) (2) (3) (4)
Limits in standard typeface are for TJ = 25°C. Limits in boldface type apply over the full operating ambient temperature range
(
−30°C ≤ TA ≤ +85°C). Unless otherwise noted, specifications apply to the LM3678 Typical Application Circuit (see Figure 1)
with VIN = EN = 3.6V
Symbol
Parameter
Test Conditions
Min
Typ
Max
Unit
VFB
Feedback voltage
VSELECT = Low and High
-3
+3
%
VREF
Internal reference voltage
0.5
V
RDSON (P)
Pin-to-pin resistance for PFET
VIN= VGS= 3.6V
150
200
m
RDSON (N)
Pin-to-pin resistance for NFET
VIN= VGS= 3.6V
110
150
m
ILIM
Switch peak current limit
Open loop
1.9
2.15
2.4
A
ISHDN
Shutdown supply current
EN = 0V
1
µA
VIH
Logic high input for EN and VSELECT
VIN = 3.6V
1.2
V
VIL
Logic low input for EN and VSELECT
VIN = 3.6V
0.4
V
IEN
Enable (EN) input current
0.01
1
µA
FOSC
Internal oscillator frequency
PWM Mode
2.7
3.3
3.6
MHz
(1)
All voltages are with respect to the potential at the GND pin.
(2)
Refer to Typical Performance Characteristics for closed loop data and its variation with regards to supply voltage and temperature.
Electrical Characteristics reflects open loop data (FB=0V and current drawn from SW pin ramped up until cycle by cycle current limit is
activated). Closed loop current limit is the peak inductor current measured in the application circuit by increasing output current until
output voltage drops by 10%.
(3)
The parameters in the electrical characteristic table are tested at VIN= 3.6V unless otherwise specified. For performance over the input
voltage range, see Typical Performance Characteristics.
(4)
Min and Max limits are specified by design, test or statistical analysis. Typical numbers represent the most likely norm.
4
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