Datasheet

+
-
+
-
1 MHz
Oscillator
Soft
Start
Ramp
Generator
+
-
+
-
Thermal
Shutdown
Undervoltage
Lockout
V
REF
+
-
0.5V
Error
Amp
Control Logic Driver
Current Limit
Comparator
Ref1
PFM Current
Comparator
Ref2
SW
Zero Crossing
Comparator
FB
EN
V
IN
PWM Comparator
pfm_low
pfm_hi
GND
Bandgap
+
-
Vcomp
1.0V
Frequency
Compensation
Adj Version
Fixed Version
LM3670
SNVS250E –NOVEMBER 2004–REVISED FEBRUARY 2013 www.ti.com
Electrical Characteristics (continued)
Limits in standard typeface are for T
J
= 25°C. Limits in boldface type apply over the full operating junction temperature range
(−40°C ≤ T
J
≤ +125°C). Unless otherwise noted V
IN
= 3.6V, V
OUT
= 1.8V, I
O
= 150mA, EN = V
IN
Symbol Parameter Condition Min Typ Max Units
I
EN
Enable (EN) Input Current 0.01 1 µA
F
OSC
Internal Oscillator Frequency PWM Mode 550 1000 1300 kHz
Figure 4. Simplified Functional Diagram
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