19-4114; Rev 0; 4/08
Ultra-Low Output Voltage, Low-Quiescent-Current
Linear Regulator for High-Temperature Applications
General Description
The MAX16999 linear regulator operates from a 2.5V to
5.5V input voltage and delivers 100mA continuous load
current with a low quiescent current typically around
13µA. The output voltage is preset to internally trimmed
voltages in the 0.5V to 3.3V range (see the
Selector
Guide).
An active-low, open-drain reset output remains
low for a programmable timeout delay after the output
voltage reaches regulation. The reset timeout is pro-
grammed by an external capacitor connected to CRES.
This device also features logic-controlled shutdown,
and short-circuit and thermal-overload protection. The
typical applications are multimedia, telematics, and
motor control microcontrollers (µCs) with always-on
requirements. The MAX16999 is used as a parallel, low-
quiescent supply to power the core or interrupt section
of µCs during sleep mode. It can also be used to sup-
ply a timer or memory during µC shutoff. The adjustable
POR delay assists with power-supply sequencing.
Features
♦
Preset 0.5V to 3.3V Output Voltage Range
♦
Up to 100mA Output Current at T
A
= +125°C
♦
13µA Quiescent Current
♦
Logic-Controlled Enable
♦
Adjustable POR Delay Flag
♦
Short to GND Protection on Reset Timer
♦
Used in Parallel with High-Current Supply of
Equal Voltages
♦
AEC-100 Qualification Request
♦
Thermal-Overload and Short-Circuit Protection
♦
Tiny 8-Pin µMAX
®
Package with Exposed Pad
MAX16999
Ordering Information
PART*
MAX16999AUA_ _+
TEMP RANGE
-40°C to +125°C
PIN-PACKAGE
8 µMAX-EP**
Applications
Industrial
SDRAM Power Supplies
Keep-Alive Timers
Handheld/Portable Devices
*Insert
the desired two-digit suffix (see the Selector Guide) into
the blanks to complete the part number. Contact the factory for
other output voltages or other package options.
+Denotes
a lead-free package and RoHS compliant.
**EP
= Exposed pad.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Selector Guide appears at end of data sheet.
Typical Operating Circuit
INPUT
2.5V TO 5.5V
C
IN
1μF
OUTPUT
0.5V TO 3.3V
IN
OUT
C
OUT
4.7μF
Pin Configuration
TOP VIEW
MAX16999
ON
OFF
RESET
EP
GND
EN
CRES
C
CRES
15nF
LOGIC
SUPPLY
OUT
OUT
CRES
RESET
1
2
3
4
+
MAX16999
*
8
7
6
5
IN
IN
EN
GND
TO CONTROLLER
μMAX
*EXPOSED PAD
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Ultra-Low Output Voltage, Low-Quiescent-Current
Linear Regulator for High-Temperature Applications
MAX16999
ABSOLUTE MAXIMUM RATINGS
IN,
RESET
to GND .................................................-0.3V to +6.0V
OUT, CRES, EN to GND ..............................-0.3V to (V
IN
+ 0.3V)
Output Short-Circuit Duration.....................................Continuous
Continuous Power Dissipation (T
A
= +70°C) (Note 1)
(derate 10.3mW/°C above +70°C)
8-Pin µMAX (single-layer PCB) ..................................824.7mW
(derate 12.9mW/°C above +70°C)
8-Pin µMAX (multilayer PCB)....................................1030.9mW
Package Junction-to-Case Thermal Resistance (θ
JC
) ......4.8°C/W
Package Junction-to-Ambient Thermal Resistance (θ
JA
)
(single-layer PCB) ........................................................97°C/W
Package Junction-to-Ambient Thermal Resistance (θ
JA
)
(multilayer PCB) ........................................................77.6°C/W
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-60°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Note 1:
Package thermal resistances were obtained using the method described in JEDEC specifications. For detailed information
on packaging thermal considerations, refer to
www.maxim-ic.com/thermal-tutorial.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS
(For devices with V
OUT
≤
1.5V, V
IN
= 3.3V. For devices with V
OUT
> 1.5V, V
IN
= 5V. EN = IN, T
J
= -40°C to +125°C, C
IN
= 1µF, C
OUT
= 4.7µF, C
CRES
= 1000pF, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
IN Operating Voltage
IN Undervoltage-Lockout (UVLO)
Threshold
IN UVLO Hysteresis
V
OUT
≤
1.5V,
I
OUT
= 1mA to 80mA
V
OUT
> 1.5V,
I
OUT
= 1mA to 100mA
-2.5
-2.5
105
150
13
23
0.035
0.1
0.4
mV/V
1.8
70
dB
f = 100kHz
40
0.1
20
µA
V
mV/mA
SYMBOL
V
IN
V
UVLO
V
IN
rising
CONDITIONS
MIN
2.5
1.94
45
+2.5
%
+2.5
mA
TYP
MAX
5.5
2.2
UNITS
V
V
mV
Output-Voltage Accuracy
V
IN
= V
OUT
+ 2V
Current Limit
Ground Current
Dropout Voltage
Load Regulation
I
LIM
I
Q
V
IN
- V
OUT
OUT = GND
I
OUT
= 100µA
I
OUT
= 100mA
I
OUT
= 80mA, V
OUT
= 3.3V (Note 2)
V
OUT
< 1V,
2.5V < V
IN
< 5.5V
V
OUT
≥
1V, (V
OUT
+
1.5V) < V
IN
< 5.5V
f = 100Hz
ΔV
OUT
/ΔI
OUT
I
OUT
= 1mA to 80mA
Line Regulation
ΔV
OUT
/ΔV
IN
I
OUT
= 80mA
Power-Supply Rejection Ratio
PSRR
I
OUT
= 10mA,
500mV
P-P,
V
IN
-
V
OUT
> 1.5V
2
_______________________________________________________________________________________
Ultra-Low Output Voltage, Low-Quiescent-Current
Linear Regulator for High-Temperature Applications
DC ELECTRICAL 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, T
J
= -40°C to +125°C, C
IN
= 1µF, C
OUT
= 4.7µF, C
CRES
= 1000pF, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
EN
Standby Current
Turn-On Delay
Logic Levels
Pullup Resistance
Pulldown Resistance
RESET
Threshold Accuracy
Threshold Hysteresis
RESET
Open-Drain Leakage
Output Low Voltage
RESET
T ime o u t
O u tp u t D eg lit c h T ime
C R ES
Charge Current
Discharge Current
Threshold
T H E R MA L P R O T EC T I O N
T h er mal- S h u td o w n Te mp er a tu r e
Thermal-Shutdown Hysteresis
T
SH DN
ΔT
SH DN
+ 1 65
15
°C
°C
I
CRES,UP
I
CRES,DN
V
CRES,THRS
RESET
goes from low to high impedance
8
1
575
600
625
10
12
µA
mA
mV
V
RES,OL
t
RSOF F
t
DEGL IT CH
V
RES
V
RES,HYST
RESET
= high impedance, V
RESET
= 5mV
I
LOAD
= 250µA
CRES = GND
V
OUT
< V
RES
30
30
V
OUT
falling
79.5
82.5
2.5
200
100
80
85.5
%V
OUT
%V
OUT
nA
mV
ms
µs
EN
H
EN
L
R
EN-H
R
EN-L
I
STB
EN = GND
From EN = high to V
OUT
= 100mV
Circuit active
Circuit inactive
V
EN
= 75% V
IN
V
EN
= 25% V
IN
120
120
70
30
0.3
10
1
µA
µs
%V
IN
kΩ
kΩ
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX16999
Note 2:
Limits are 100% production tested at T
A
= +25°C. Limits over the operating temperature range are guaranteed by design.
Note 3:
Dropout voltage is defined as V
IN
- V
OUT
when V
OUT
is 2% below its value for V
IN
= V
OUT
+ 2V.
_______________________________________________________________________________________
3
Ultra-Low Output Voltage, Low-Quiescent-Current
Linear Regulator for High-Temperature Applications
MAX16999
Typical Operating Characteristics
(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.)
OUTPUT-VOLTAGE ACCURACY
vs. LOAD CURRENT
MAX16999 toc01
OUTPUT VOLTAGE
vs. INPUT VOLTAGE
MAX16999 toc02
OUTPUT-VOLTAGE ACCURACY
vs. TEMPERATURE
0.4
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
5.5
-50
0
50
TEMPERATURE (°C)
100
150
I
OUT
= 100mA
I
OUT
= 50mA
V
OUT
= 1V
I
OUT
= 0.1mA
I
OUT
= 1mA
MAX16999 toc03
0.5
OUTPUT-VOLTAGE ACCURACY (%)
0.4
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
0
20
40
60
80
V
OUT
= 3.3V
V
OUT
= 1V
V
OUT
= 0.5V
1.004
1.003
1.002
OUTPUT VOLTAGE (V)
1.001
1.000
0.999
0.998
0.997
0.996
0.995
0.994
I
OUT
= 50mA
I
OUT
= 100mA
4.5
5.0
I
OUT
= 0.1mA
I
OUT
= 1mA
0.5
OUTPUT-VOLTAGE ACCURACY (%)
100
2.5
3.0
3.5
4.0
LOAD CURRENT (mA)
INPUT VOLTAGE (V)
GROUND-PIN CURRENT
vs. LOAD CURRENT
MAX16999 toc04
GROUND-PIN CURRENT
vs. INPUT VOLTAGE
45
GROUND-PIN CURRENT (μA)
40
35
30
25
20
15
10
5
0
I
OUT
= 0.1mA
0
1
2
3
I
OUT
= 1mA
0
4
5
6
-50
-25
I
OUT
= 50mA
I
OUT
= 100mA
V
OUT
= 0.5V
MAX16999 toc05
GROUND-PIN CURRENT
vs. TEMPERATURE
I
OUT
= 100mA
GROUND-PIN CURRENT (μA)
25
20
15
10
5
V
OUT
= 1V
0
25
50
75
100 125 150
I
OUT
= 0.1mA
I
OUT
= 1mA
I
OUT
= 50mA
MAX16999 toc06
40
35
GROUND-PIN CURRENT (μA)
30
25
20
15
10
5
0
0
20
40
60
80
V
OUT
= 0.5V
V
OUT
= 1V
V
OUT
= 3.3V
50
30
100
LOAD CURRENT (mA)
INPUT VOLTAGE (V)
TEMPERATURE (°C)
CURRENT LIMIT
vs. INPUT VOLTAGE
MAX16999 toc07
DROPOUT VOLTAGE
vs. LOAD CURRENT
90
DROPOUT VOLTAGE (mA)
80
70
PSRR (dB)
60
50
40
30
20
V
OUT
= 3.3V
MAX16999 toc08
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
70
60
50
40
30
20
10
V
OUT
= 0.5V, I
OUT
= 10mA
0
MAX16999 toc09
170
165
CURRENT LIMIT (mA)
160
155
150
145
140
135
130
2.5
3.0
3.5
4.0
4.5
5.0
100
80
10
0
5.5
0
25
50
75
100
125
150
INPUT VOLTAGE (V)
LOAD CURRENT (mA)
0.01
0.1
1
10
100
1000
FREQUENCY (kHz)
4
_______________________________________________________________________________________
Ultra-Low Output Voltage, Low-Quiescent-Current
Linear Regulator for High-Temperature Applications
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.)
LINE-TRANSIENT RESPONSE NEAR
DROPOUT
MAX16999 toc11
MAX16999
LINE-TRANSIENT RESPONSE
MAX16999 toc10
4V
V
IN
3.5V
V
IN
1.6V
0.6V
V
OUT
V
OUT
= 0.5V
200μs/div
100mV/div
AC-COUPLED
V
OUT
V
OUT
= 0.5V
200μs/div
200mV/div
AC-COUPLED
LOAD-TRANSIENT RESPONSE
MAX16999 toc12
LOAD-TRANSIENT RESPONSE NEAR
DROPOUT
MAX16999 toc13
50mA/div
I
OUT
0
I
OUT
50mA/div
0
V
OUT
V
OUT
= 3.3V
200μs/div
100mV/div
AC-COUPLED
V
OUT
V
OUT
= 3.3V, V
IN
= V
OUT
+ 50mV
200μs/div
100mV/div
AC-COUPLED
SHUTDOWN RESPONSE
MAX16999 toc14
RESET/ENABLE RESPONSE
MAX16999 toc15
5V
V
EN
0
V
EN
5V
0
V
OUT
1V
0
1V
V
OUT
V
OUT
= 1V, I
OUT
= 50mA
100μs/div
0
V
RESET
V
OUT
= 1V, I
OUT
= 50mA, C
CRES
= 15,000pF
400μs/div
5V
0
_______________________________________________________________________________________
5
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