MAX16999
Ultra-Low Output Voltage, Low-Quiescent-Current
Linear Regulator for High-Temperature Applications
6 _______________________________________________________________________________________6 _______________________________________________________________________________________
Pin Description
PIN NAME FUNCTION
1, 2 OUT
Regulator Output. Bypass OUT to GND with a 4.7µF ceramic capacitor. OUT becomes high impedance when
EN is low.
3 CRES POR Timer. Bypass CRES to GND with a ceramic capacitor to define POR timing (see the POR Timer section).
4 RESET
Open-Drain, Active-Low Reset Output. RESET is high impedance when output is in regulation or if the IC is in
shutdown. RESET is pulled low when V
OUT
drops below 82.5% (typ) of its nominal voltage.
5 GND Ground. Connect GND to a large circuit board ground plane and directly to the exposed paddle.
6EN
Active-High Enable Input. Drive EN low to place the regulator in standby mode. Drive EN high or connect to IN
for normal operation.
7, 8 IN Regulator Input. Bypass IN to GND with at least a 1µF ceramic capacitor.
—EP
Exposed Paddle. Connect EP to a large pad or circuit board ground plane to maximize power dissipation. EP
serves as a heatsink.
LINE/RESET RESPONSE
MAX16999 toc16
2ms/div
V
IN
V
OUT
0
0
2V/div
0
5V
500mV/div
V
OUT
= 0.5V, I
OUT
= 50mA, C
CRES
= 15,000pF
V
RESET
CRES PULLUP CURRENT
vs. TEMPERATURE
MAX16999 toc17
TEMPERATURE (°C)
CRES PULLUP CURRENT (μA)
12510050 750 25-25
2
4
6
8
10
12
14
16
18
20
0
-50 150
V
OUT
= 1V, C
CRES
= 15,000pF
RESET TIMEOUT
vs. CRES CAPACITANCE
MAX16999 toc18
CRES CAPACITANCE (nF)
RESET TIMEOUT (ms)
400300200100
5
10
15
20
25
30
0
0500
SHORT-CIRCUIT RESPONSE
MAX16999 toc19
200μs/div
V
OUT
I
OUT
0
0
5V
0
5A
5V
V
OUT
= 3.3V
V
RESET
Typical Operating Characteristics (continued)
(For devices with V
OUT
< 1.5V, V
IN
= 3.3V. For devices with V
OUT
> 1.5V, V
IN
= 5V. EN = IN, C
IN
= 1µF, C
OUT
= 4.7µF, C
CRES
= 1000pF,
T
A
= + 25°C, unless otherwise noted.)
