Datasheet

LM3671
LM3671Q
www.ti.com SNVS294Q –NOVEMBER 2004–REVISED NOVEMBER 2013
ELECTRICAL CHARACTERISTICS
(1)(2)(3)
Limits in standard typeface are for T
J
= 25°C. Limits in boldface type apply over the entire junction temperature range for
operation, −40°C to +125°C. Unless otherwise noted, specifications apply to the LM3671MF/TL/LC with V
IN
= EN = 3.6V
Symbol Parameter Condition Min Typ Max Units
V
IN
Input Voltage
(4)
2.7 5.5 V
Feedback Voltage (Fixed) MF −4 +4
Feedback Voltage (Fixed) TL PWM mode
(5)
−2.5 +2.5 %
Feedback Voltage (Fixed) LC −4 +4
Feedback Voltage (ADJ) MF
−4 +4
(6)
PWM mode
(5)
%
V
FB
Feedback Voltage (ADJ) TL −2.5 +2.5
2.7V ≤ V
IN
≤ 5.5V
Line Regulation 0.031 %/V
I
O
= 10 mA
100 mA ≤ I
O
≤ 600 mA
Load Regulation 0.0013 %/mA
V
IN
= 3.6V
V
REF
Internal Reference Voltage 0.5 V
I
SHDN
Shutdown Supply Current EN = 0V 0.01 1 µA
No load, device is not switching (FB
I
Q
DC Bias Current into V
IN
forced higher than programmed 16 35 µA
output voltage)
R
DSON (P)
Pin-Pin Resistance for PFET V
IN
= V
GS
= 3.6V 380 500 mΩ
R
DSON (N)
Pin-Pin Resistance for NFET V
IN
= V
GS
= 3.6V 250 400 mΩ
I
LIM
Switch Peak Current Limit Open Loop
(7)
830 1020 1150 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
(5)
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 are not specified, but do 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) The input voltage range recommended for ideal applications performance for the specified output voltages are given below:V
IN
= 2.7V to
4.5V for 1.1V ≤ V
OUT
< 1.5VV
IN
= 2.7V to 5.5V for 1.5V ≤ V
OUT
< 1.8VV
IN
= (V
OUT
+ V
DROPOUT
) to 5.5V for 1.8V ≤ V
OUT
≤ 3.3Vwhere
V
DROPOUT
= I
LOAD
*( R
DSON, PFET
+ R
INDUCTOR
)
(5) Test condition: 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
+ 1V.
(6) ADJ version is configured to 1.5V output. For ADJ output version: V
IN
= 2.7V to 4.5V for 0.90V ≤ V
OUT
< 1.1VV
IN
= 2.7V to 5.5V for 1.1V
≤ V
OUT
< 3.3V
(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 TABLE
θ
JA
T
A
≤ 25°C T
A
= 60°C T
A
= 85°C
Power Rating Power Rating Power Rating
130°C/W (4 layer board) SOT-23 770 mW 500 mW 310 mW
85°C/W (4 layer board) 5-bump 1179 mW 765 mW 470 mW
DSBGA
165°C/W (4 layer board) 6-pin 606 mW 394 mW 242 mW
USON
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