LM3677_0810 Datasheet, PDF (4/24 Pages) National Semiconductor (TI) – 3MHz, 600mA Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits

Absolute Maximum Ratings (Note 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
If Military/Aerospace specified devices are required, please
contact the National Semiconductor Sales Office/Distributor
for availability and specifications.
V_IN Pin: Voltage to GND
FB, SW, EN Pin:
Continuous Power Dissipation
(Note 4)
Junction Temperature (T_J-MAX)
Storage Temperature Range
Maximum Lead Temperature
(Soldering, 10 sec.)
−0.2V to 6.0V
(GND−0.2V) to
(V_IN + 0.2V)
Internally Limited
+125°C
−65°C to +150°C
260°C
ESD Rating (Note 5)
Human Body Model: All Pins
Machine Model: All Pins
2.0 kV
200V
Operating Ratings (Note 2), (Note 3)
Input Voltage Range
Recommended Load Current
Junction Temperature (T_J) Range
Ambient Temperature (T_A) Range (Note
6)
2.7V to 5.5V
0 mA to 600 mA
−30°C to +125°C
−30°C to +85°C
Thermal Properties
Junction-to-Ambient Thermal
Resistance (θ_JA) (Note 7)
85°C/W
Electrical Characteristics (Note 3), (Note 9), (Note 10) Limits in standard typeface are for T_J = T_A = 25°C.
Limits in boldface type apply over the operating ambient temperature range (−30°C ≤ T_A ≤ +85°C). Unless otherwise noted,
specifications apply to the LM3677 with V_IN = EN = 3.6V.
Symbol
Parameter
Condition
Min Typ Max Units
V_IN
Input Voltage (Note 11)
Feedback Voltage (TL)
V_FB
Feedback Voltage (LE)
PWM mode
2.7
5.5
V
-2.5
+2.5
%
-4.0
+4.0
V_REF
I_SHDN
I_Q
R_{DSON (P)}
R_{DSON (N)}
I_LIM
V_IH
V_IL
I_EN
F_OSC
Internal Reference Voltage
Shutdown Supply Current
DC Bias Current into V_IN
Pin-Pin Resistance for PFET
Pin-Pin Resistance for NFET
Switch Peak Current Limit
Logic High Input
Logic Low Input
Enable (EN) Input Current
Internal Oscillator Frequency
EN = 0V
No load, device is not switching
V_IN= V_GS= 3.6V, I_SW= 100mA
V_IN= V_GS= 3.6V, I_SW= -100mA
Open Loop(Note 8)
PWM Mode
1085
1.0
0.5
0.01
16
350
150
1220
0.01
2.5
3
1
35
450
250
1375
0.4
1
3.5
V
µA
µA
mΩ
mΩ
mA
V
V
µA
MHz
Note 2: 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 3: All voltages are with respect to the potential at the GND pin.
Note 4: Internal thermal shutdown circuitry protects the device from permanent damage. Thermal shutdown engages at T_J= 150°C (typ.) and disengages at
T_J= 130°C (typ.).
Note 5: The Human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin. The machine model is a 200 pF capacitor discharged
directly into each pin. MIL-STD-883 3015.7
Note 6: 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_A-MAX) is dependent on the maximum operating junction temperature (T_J-MAX), the maximum power dissipation of the device in
the application (P_D-MAX) and the junction to ambient thermal resistance of the package (θ_JA) in the application, as given by the following equation: T_A-MAX= T_J-MAX
− (θ_JAx P_D-MAX). Refer to Dissipation rating table for P_D-MAX values at different ambient temperatures.
Note 7: 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. Value specified here 85 °C/W is based on measurement results using a 4 layer board as per JEDEC
standards.
Note 8: Refer to datasheet curves for closed loop data and its variation with regards to supply voltage and temperature. Electrical Characteristic table 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%.
Note 9: 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 10: The parameters in the electrical characteristic table are tested under open loop conditions at V_IN= 3.6V unless otherwise specified. For performance
over the input voltage range and closed loop condition, refer to the datasheet curves.
Note 11: For output voltage 1.2V or lower, input voltage needs to be derated to the range of 2.7V to 5.0V in order to perform within specification.
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