65V, Low-Quiescent-Current, High-Voltage Linear
Regulators with µP Reset and Watchdog Timer
Typical Operating Characteristics (continued)
(V = +14V, C = 10µF, C
= 15µF, V = +2.4V, V
= +5V, SET = GND, T = +25°C, unless otherwise specified.)
IN
IN
OUT
EN
OUT
A
GROUND-CURRENT DISTRIBUTION
GROUND-CURRENT DISTRIBUTION
(T = +40°C)
A
(T = +125°C)
A
30
30
25
20
15
10
5
25
20
15
10
5
0
0
47 48 51 52 53 54 55 56 57 58 59 60 61 80
45 53 56 57 58 59 60 61 62 63 64 65 89
I
(µA)
I
(µA)
GND
GND
Pin Description
PIN
MAX5023 MAX5024
NAME
FUNCTION
Regulator Input. Supply voltage ranges from +6.5V to +65V. Bypass with a 10µF capacitor to
GND.
1
2
3
4
1
2
3
4
IN
Enable Input. Force EN high to turn on the regulator. Pull EN low and force HOLD high (or
open circuit) to place the device in shutdown mode. Internally connected to ground through a
5MΩ resistor.
EN
Ground. GND also functions as a heatsink. Solder to large pads or the circuit-board ground
plane to maximize thermal dissipation.
GND
Active-Low Open-Drain Reset Output. RESET remains low while V
is below the reset
OUT
threshold or when WDI is not pulsed within 1.6s. RESET remains low for the duration of the
RESET
reset timeout period after the reset conditions are terminated.
Regulator Hold Input. When HOLD is forced low, the regulator stores the on state of the
output allowing the regulator to function even if EN is pulled low. To shutdown the regulator,
release HOLD after EN is pulled low. If HOLD is unused, either float HOLD or connect to OUT.
Internally connected to OUT through a 4µA pullup current source (see Table 1, Truth Table).
5
5
HOLD
6
7
6
N.C.
WDI
No Connection. Not internally connected.
Watchdog Timer Input (MAX5023 only). The watchdog timer asserts a reset if WDI does not
transition within the 1.6s watchdog timeout period. WDI cannot be disabled.
—
Regulator Output. Fixed (+3.3V or +5V) or adjustable (+2.5V to +11V). Bypass with a 15µF
capacitor (min).
8
8
7
OUT
SET
Feedback Input for Setting the Output Voltage. Connect to GND to set the output voltage to
the preset fixed value (+3.3V or +5V). Connect to an external resistor-divider network for
adjustable output operation (MAX5024 only).
—
6
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