LM3661TL-1.25 NSC [National Semiconductor], LM3661TL-1.25 Datasheet - Page 6

• Manufacturer Part Number: LM3661TL-1.25
• Description: 450mA Subminiature, Micropower Step-Down DC-DC Converter for Ultra Low-Voltage Circuits
• Manufacturer: NSC [National Semiconductor]

www.national.com
V
V
V
H
V
L
V
V
I
I
R
f
f
SEL,H
SEL, L
SYNC
OSC
EN,H
EN,L
SYNC/MODE,
SYNC/MODE,
SEL, H
SEL, L
EN
Electrical Characteristics
Specifications with standard typeface are for T
Range (T
C
Note 1: 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 2: Min and Max limits are guaranteed by design, test, or statistical analysis. Typical numbers are not guaranteed, but do represent the most likely norm. Due
to the pulsed nature of the testing T
Note 3: Thermal shutdown will occur if the junction temperature exceeds 150˚C. This function is only active in PWM mode.
Note 4: The LM3202 is designed for mobile phone applications where turn-on after power-up is controlled by the system controller and where requirements for a
small package size overrule increased die size for internal Under Voltage Lock-Out (UVLO) circuitry. Thus, it should be kept in shutdown by holding the EN pin low
until the input voltage exceeds 2.7V.
Note 5: The hysteresis voltage is the minimum voltage swing on FB that causes the internal feedback and control circuitry to turn the internal PFET switch on and
then off, during test mode.
Note 6: SYNC/MODE driven with an external clock switching between V
mode at the external clock frequency.
Symbol
OUT
= 22 µF.
A
= T
EN Logic High Input (Note 4)
EN Logic Low Input
SYNC/MODE Logic High Input
SYNC/MODE Logic Low Input
V
V
I
I
Enable pin input resistance
SYNC/MODE Clock Frequency
Range (Note 6)
Internal Oscillator Frequency
SEL
SEL
SEL
SEL
J
= −30˚C to +85˚C). Unless otherwise specified, PV
Logic High Input
Logic Low Input
Logic High Input
Logic Low Input
Parameter
A
=T
J
for the electrical characteristics table.
(Note 2) (Continued)
J
V
V
PWM mode (SYNC/MODE = V
V
= 25˚C, and those in bold face type apply over the full Operating Temperature
IN
IN
IN
= 2.7V to 5.5V
= 2.7V to 5.5V
= 2.7V to 5.5V
IN
and GND. When an external clock is present at SYNC/MODE, the IC is forced to PWM
Remarks
6
IN
= V
DD
= EN = SYNC/MODE = V
IN
)
Min
500
535
0.4
0.4
0.4
0.4
Typ
600
1
SEL
= 3.6V, I
Max
750
675
1.2
1.2
1.2
1.2
SEL
= 0V,
Units
kHz
kHz
MΩ
V
V
V
V
V
V
V