User Manual

MAX15009/MAX15011
Automotive 300mA LDO Regulators with
Switched Output and Overvoltage Protector
_______________________________________________________________________________________ 9
OVERVOLTAGE SWITCH FAULT
MAX15009 toc26
400μs/div
V
IN
10V/div
V
GATE
20V/div
V
OUT_PROT
20V/div
I
OUT_PROT
= 1A
V
OV
= 25V
0V
0V
0V
OVERVOLTAGE LIMIT FAULT
MAX15009 toc27
40ms/div
V
IN
20V/div
V
GATE
20V/div
V
OUT_PROT
20V/div
I
OUT_PROT
= 1A
OV THRESHOLD = 35V
0V
0V
0V
Typical Operating Characteristics (continued)
(V
IN
= V
EN_LDO
= V
EN_PROT
= V
EN_SW
= +14V, C
IN
= 10µF, C
OUT_LDO
= 22µF, C
OUT_SW
= 1µF, V
OUT_LDO
= +5V, FB_LDO = SGND,
T
A
= +25°C, unless otherwise specified.)
RESET TIMEOUT DELAY
vs. TEMPERATURE
MAX15009 toc29
TEMPERATURE (°C)
-25 250 100 12550 15075-50
0
0.6
1.2
1.8
0.4
1.0
1.6
0.2
0.8
1.4
2.0
RESET TIMEOUT DELAY (ms)
C
RESET
= 2.2nF
C
RESET
= 220pF
RESET TIMEOUT DELAY
vs. C
RESET
MAX15009 toc28
C
RESET
(nF)
8621040
7
5
3
6
4
2
0
1
RESET TIMEOUT DELAY (ms)
SWITCH CURRENT LIMIT
vs. ILIM RESISTANCE
MAX15009 toc30
ILIM RESISTANCE (kΩ)
180120 140 1606040 100 2008020
20
60
120
180
40
100
160
80
140
200
SWITCH CURRENT LIMIT (mA)
T
A
= +125°C
T
A
= -40°C
T
A
= +25°C
T
A
= +85°C
INTERNAL PRESET SWITCH CURRENT LIMIT
vs. TEMPERATURE
MAX15009 toc31
TEMPERATURE (°C)
-25 25 500 125100 15075-50
150
180
210
240
170
160
200
230
190
220
250
PRESET CURRENT LIMIT (mA)
I
OC_DELAY_UP
AND I
OC_DELAY_DOWN
vs. TEMPERATURE
MAX15009 toc32
TEMPERATURE (°C)
-25 25 500 125100 15075-50
0
6
12
4
2
10
16
8
14
18
OC_DELAY PULLUP/PULLDOWN CURRENT (μA)
I
OC_DELAY_DOWN
I
OC_DELAY_UP