LM3489_08 Datasheet, PDF (3/16 Pages) National Semiconductor (TI) – Hysteretic PFET Buck Controller with Enable Pin

Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
VIN Voltage
PGATE Voltage
FB Voltage
ISENSE Voltage
ADJ Voltage
EN Voltage (Note 3)
Maximum Junction Temp.
Power Dissipation, T_A = 25°C (Note
2)
−0.3V to 36V
−0.3V to 36V
−0.3V to 5V
−1.0V to 36V
-1V (<100ns)
−0.3V to 36V
−0.3V to 6V
150°C
417mW
ESD Susceptibilty (Note 4)
Human Body Model
Lead Temperature
Vapor Phase (60 sec.)
Infared (15 sec.)
Storage Temperature
2kV
215°C
220°C
−65°C to 150°C
Operating Ratings (Note 1)
Supply Voltage Range (V_IN)
EN Voltage (max.) (Note 3)
Operating Junction Temperature (T_J)
4.5V to 35V
5.5V
−40°C to +125°C
Electrical Characteristics (Note 5), (Note 6) Specifications in Standard type face are for T_J = 25°C, and in
bold type face apply over the full Operating Temperature Range (T_J = −40°C to +125°C). Unless otherwise specified, V_IN = 12V,
V_ISNS = V_IN − 1V, and V_ADJ = V_IN − 1.1V. Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.
Symbol
Parameter
Conditions
Min
Typ
Max Units
I_SHDN
V_EN
V_{EN_HYST}
I_Q
V_FB
(Note 7)
Shutdown input supply current
Enable threshold voltage
Enable threshold hysteresis
Quiescent Current at ground pin
Feedback Voltage
EN = 0V
Enable rising
FB = 1.5V (Not Switching)
7
15
µA
1.15
1.5
1.85
V
130
mV
280
400
µA
1.223 1.239 1.255
V
1.214
1.264
V_HYST
Comparator Hysteresis
10
15
mV
14
20
V_{CL_OFFSET}
I_{CL_ADJ}
T_CL
R_PGATE
I_PGATE
Current limit comparator offset
Current limit ADJ current source
Current limit one shot off time
Driver resistance
Driver Output current
V_FB = 1.0V
V_FB = 1.5V
V_ADJ = 11.5V
V_ISNS = 11.0V
V_FB = 1.0V
Source
I_SOURCE = 100mA
Sink
I_SINK = 100mA
Source
V_IN = 7V, PGATE = 3.5V
Sink
VIN = 7V, PGATE = 3.5V
-20
0
+20
mV
3.0
5.5
7.0
µA
6
9
14
µs
5.5
Ω
8.5
0.44
A
0.1
I_FB
(Note 9)
FB pin Bias Current
V_FB = 1.0V
300
750
nA
T_{ONMIN_NOR} Minimum on time in normal
V_ISNS = V_ADJ + 0.1V
100
ns
operation
Cload on OUT = 1000pF (Note 10)
T_{ONMIN_CL}
Minimum on time in current limit
V_ISNS = V_ADJ - 0.1V
VFB = 1.0V
200
ns
Cload on OUT = 1000pF (Note 10)
%V_FB/ΔV_IN Feedback Voltage Line Regulation 4.5 ≤ V_IN ≤ 35V
0.01
%/V
3
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