Datasheet

LM3674
www.ti.com SNVS405F –DECEMBER 2005–REVISED MAY 2013
Electrical Characteristics
(1)(2)(3)
Limits in standard typeface are for T
J
= 25°C. Limits in boldface type apply over the full operating junction temperature range
(−30°C ≤ T
J
≤ 125°C). Unless otherwise noted, specifications apply to the LM3674 with V
IN
= EN = 3.6V
Parameter Test Condition Min Typ Max Units
V
FB
Feedback Voltage
(4)(5)
I
O
= 10mA -4 +4 %
Line Regulation 2.7V ≤ V
IN
≤ 5.5V 0.083 %/V
I
O
= 100 mA
Load Regulation 100 mA ≤ I
O
≤ 600 mA 0.0010 %/mA
V
IN
= 3.6V
V
REF
Internal Reference Voltage See
(6)
0.5 V
I
SHDN
Shutdown Supply Current EN = 0V 0.01 1 µA
I
Q
DC Bias Current into V
IN
No load, device is not switching 300 600 µA
(FB=0V)
R
DSON (P)
Pin-Pin Resistance for PFET I
SW
= 200mA 380 500 mΩ
R
DSON (N)
Pin-Pin Resistance for NFET I
SW
= 200mA 250 400 mΩ
I
LIM
Switch Peak Current Limit Open Loop
(7)
830 1020 1200 mA
V
IH
Logic High Input 1.0 V
V
IL
Logic Low Input 0.4 V
I
EN
Enable (EN) Input Current 0.01 1 µA
F
OSC
Internal Oscillator Frequency PWM Mode 1.6 2 2.6 MHz
(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) The parameters in the electrical characteristic table are tested at V
IN
= 3.6V unless otherwise specified. For performance over the input
voltage range refer to datasheet curves.
(4) ADJ configured to 1.5V output.
(5) For V
OUT
less than 2.5V, V
IN
= 3.6V, for V
OUT
greater than or equal to 2.5V, V
IN
= V
OUT
+1.
(6) For the ADJ version the resistor dividers should be selected such that at the desired output voltage, the voltage at the FB pin is 0.5V.
(7) 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%.
Dissipation Rating
over operating free-air temperature range (unless otherwise noted)
θ
JA
T
A
≤ 25°C (Power Rating) T
A
= 60°C (Power Rating) T
A
= 85°C (Power Rating)
250°C/W (2 layer board) 400mW 260mW 160mW
130°C/W (4 layer board) 770mW 500mW 310mW
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