LM3485MM Datasheet, PDF (5/23 Pages) Texas Instruments – Hysteretic PFET Buck Controller

LM3485
www.ti.com
SNVS178G – JANUARY 2002 – REVISED FEBRUARY 2013
Typical Performance Characteristics (continued)
Unless otherwise specified, T_J = 25°C
PGATE Voltage
vs
Input Voltage
6.0
Typical V_PGATE vs
Time
V_IN = 9V
10
5.5
TJ =125qC
5.0
TJ = 25qC
8
6
C_PGATE = 1800 pF
4.5
TJ = -40qC
4.0
3.5
3.0
4
160
140
12
20
28
36
INPUT VOLTAGE (V)
Minimum ON Time
vs
Temperature
VIN= 4.5V
120
100 _{VIN= 12V}
80
60
VIN= 24V
40
20
0
-20 -40 0 20 40 60 80 100 120 140
JUNCTION TEMPERATURE (°C)
Operating ON Time vs
Output Load Current
(V_IN = 12V)
5
4
3
3.3VOUT
2
5.0VOUT
C_PGATE = 1020 pF
4
C_PGATE = 540 pF
C_PGATE = 110 pF
2
0
0
20
50
100
150
T (ns)
Operating ON Time vs
Output Load Current
(V_IN = 4.5V)
16
3.3VOUT
12
8
4
0
0
100
1.242VOUT
200 400 600 800 1000
OUTPUT LOAD CURRENT (mA)
Efficiency vs
Load Current
(V_OUT = 3.3V, L = 6.8µH)
90 ^{VIN = 4.5V}
80
VIN = 12V
70
60
1
1.242VOUT
50
0
0
200 400 600 800 1000
OUTPUT LOAD CURRENT (mA)
40
10
100
1000
LOAD CURRENT (mA)
10000
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