lm27241 National Semiconductor Corporation, lm27241 Datasheet - Page 5

• Manufacturer Part Number: lm27241
• Description: Synchronous Buck Regulator Controller For Mobile Systems
• Manufacturer: National Semiconductor Corporation

Reference
V
V
I
Chip Supply
I
I
I
I
I
I
I
I
V
HYS
Logic
I
V
V
R
V
V FPWM_LO
FB
Q_VIN
SD_VIN
Q_VDD
SD_VDD
Q_V5
SD_V5
Q_BOOT
SD_BOOT
EN
Absolute Maximum Ratings
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Electrical Characteristics
Specifications with standard typeface are for T
ture range. VDD = V5 = 5V, V
Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.
FB_REG
FB_LINE REG
DD_UVLO
EN_HI
EN_LO
FPWM
FPWM_HI
Voltages from the indicated pins to SGND/PGND unless
otherwise indicated (Note 2):
VIN
V5
VDD
BOOT
BOOT to SW
SW
ILIM
SENSE, FB
PGOOD
EN
Power Dissipation (T
(Note 3)
VDD_UVLO
Symbol
A
= 25˚C)
FB Pin Voltage at
Regualtion
V
FB Pin Current (sourcing)
VIN Quiescent Current
VIN Shutdown Current
VDD Quiescent Current
VDD Shutdown Current
V5 Normal Operating
Current
V5 Shutdown Current
BOOT Quiescent Current
BOOT Shutdown Current
VDD UVLO Threshold
VDD UVLO Hysteresis
EN Input Current
EN Input Logic High
EN Input Logic Low
FPWM Pull-down
FPWM Input Logic High
FPWM Input Logic Low
FB
Line Regulation
SGND
Parameter
= V
PGND
= 0V, VIN = 15V, V
-0.3V to 30V
-0.3V to 36V
-0.3V to 30V
-0.3V to 30V
J
(Note 1)
-0.3V to 7V
-0.3V to 7V
-0.3V to 7V
-0.3V to 7V
-0.3V to 7V
-0.3V to 7V
= 25˚C, and those with boldface apply over full Operating Junction Tempera-
0.75W
VDD = 4.5V to 5.5V,
VIN = 5.5V to 28V
VDD = 4.5V to 5.5V,
VIN = 5.5V to 28V
V
V
V
V
V
V
V
V
V
V
V
VDD rising from 0V
VDD = V5 falling from
V
V
V
FB
FB
EN
FB
EN
FB
FB
EN
FB
FB
EN
DD_UVLO
EN
FPWM
= 0.7V
at regulation
= 0.7V
= 0.7V
= 0.5V
= 0.7V
= 0.5V
= 0V
= 0V
= 0V
= 0V
= 0 to 5V
= 2V
Conditions
5
EN
Operating Ratings
Junction Temperature
ESD Rating (Note 4)
Ambient Storage Temperature
Range
Soldering Dwell Time,
Temperature
Vapor Phase
= 3V, R
Wave
Infrared
VIN
VDD, V5
Junction Temperature
FADJ
= 22.1K unless otherwise stated (Note 5).
Min
591
100
3.9
0.5
2
2
(Note 7)
Typical
1.75
(Note 1)
600
100
300
200
0.5
0.3
0.5
4.2
0.7
1.8
1.3
1.8
1.3
20
0
8
0
2
1
0
-5˚C to +125˚C
4.5V to 5.5V
1000
5.5V to 28V
Max
1.25
609
100
200
500
0.5
4.5
0.9
0.8
0.8
-65˚C to +150˚C
15
5
3
5
5
5
10 sec, 240˚C
75 sec, 219˚C
4 sec, 260˚C
www.national.com
+150˚C
Units
mV
mA
mA
kΩ
nA
µA
µA
µA
µA
µA
µA
µA
V
V
V
V
V
V
2kV