MAX16999 [MAXIM]
Ultra-Low Output Voltage, Low-Quiescent-Current Linear Regulator for High-Temperature Applications; 超低输出电压，低静态电流线性稳压器，用于高温应用
| 型号： | MAX16999 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Ultra-Low Output Voltage, Low-Quiescent-Current Linear Regulator for High-Temperature Applications |
| 文件： | 总10页 (文件大小：218K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-4114; Rev 0; 4/08
Ultra-Low Output Voltage, Low-Quiescent-Current
Linear Regulator for High-Temperature Applications
MAX169
General Description
Features
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.
♦ Preset 0.5V to 3.3V Output Voltage Range
♦ Up to 100mA Output Current at T = +125°C
A
♦ 13µA Quiescent Current
♦ Logic-Controlled Enable
♦ Adjustable POR Delay Flag
♦ Short to GND Protection on Reset Timer
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.
♦ 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
Ordering Information
PART*
TEMP RANGE
PIN-PACKAGE
Applications
MAX16999AUA_ _+
-40°C to +125°C
8 µMAX-EP**
Industrial
*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.
SDRAM Power Supplies
Keep-Alive Timers
Handheld/Portable Devices
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Selector Guide appears at end of data sheet.
Typical Operating Circuit
Pin Configuration
OUTPUT
0.5V TO 3.3V
INPUT
2.5V TO 5.5V
TOP VIEW
IN
OUT
C
IN
C
OUT
1μF
4.7μF
LOGIC
SUPPLY
MAX16999
+
OUT
OUT
1
2
3
4
8
7
6
5
IN
ON
EN
CRES
C
15nF
IN
CRES
MAX16999
OFF
CRES
RESET
EN
GND
*
RESET
μMAX
TO CONTROLLER
EP
GND
*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
ABSOLUTE MAXIMUM RATINGS
IN, RESET to GND.................................................-0.3V to +6.0V
OUT, CRES, EN to GND ..............................-0.3V to (V + 0.3V)
Output Short-Circuit Duration.....................................Continuous
Package Junction-to-Ambient Thermal Resistance (θ
(single-layer PCB) ........................................................97°C/W
)
JA
IN
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
Continuous Power Dissipation (T = +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
A
Package Junction-to-Case Thermal Resistance (θ ) ......4.8°C/W
JC
MAX169
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
≤ 1.5V, V = 3.3V. For devices with V
> 1.5V, V = 5V. EN = IN, T = -40°C to +125°C, C = 1µF, C
OUT
IN
OUT
IN
J
IN
OUT
= 4.7µF, C
= 1000pF, unless otherwise noted. Typical values are at T = +25°C.) (Note 1)
CRES
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
IN Operating Voltage
V
2.5
5.5
V
IN
IN Undervoltage-Lockout (UVLO)
Threshold
V
V
V
rising
1.94
45
2.2
V
UVLO
IN
IN
IN UVLO Hysteresis
mV
V
I
≤ 1.5V,
= 1mA to 80mA
OUT
OUT
-2.5
+2.5
+2.5
Output-Voltage Accuracy
= V
+ 2V
%
OUT
V
> 1.5V,
= 1mA to 100mA
OUT
OUT
-2.5
105
I
Current Limit
I
OUT = GND
150
13
mA
µA
LIM
I
I
I
= 100µA
20
OUT
OUT
OUT
Ground Current
I
Q
= 100mA
= 80mA, V
23
Dropout Voltage
Load Regulation
V
- V
= 3.3V (Note 2)
0.035
0.1
0.1
V
IN
OUT
OUT
ΔV
/ΔI
I
= 1mA to 80mA
mV/mA
OUT OUT OUT
V
< 1V,
IN
OUT
0.4
1.8
2.5V < V < 5.5V
Line Regulation
ΔV
/ΔV
I
I
= 80mA
= 10mA,
mV/V
dB
OUT
IN
OUT
V
≥ 1V, (V
+
OUT
OUT
1.5V) < V < 5.5V
IN
OUT
f = 100Hz
70
40
Power-Supply Rejection Ratio
PSRR
500mV
V
V
-
P-P, IN
f = 100kHz
> 1.5V
OUT
2
_______________________________________________________________________________________
Ultra-Low Output Voltage, Low-Quiescent-Current
Linear Regulator for High-Temperature Applications
MAX169
DC ELECTRICAL CHARACTERISTICS (continued)
(For devices with V
≤ 1.5V, V = 3.3V. For devices with V
> 1.5V, V = 5V. EN = IN, T = -40°C to +125°C, C = 1µF, C
OUT
IN
OUT
IN
J
IN
MAX
1
OUT
= 4.7µF, C
= 1000pF, unless otherwise noted. Typical values are at T = +25°C.) (Note 1)
CRES
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
UNITS
EN
Standby Current
Turn-On Delay
I
EN = GND
0.3
10
µA
µs
STB
From EN = high to V
Circuit active
= 100mV
OUT
EN
70
H
Logic Levels
%V
IN
EN
Circuit inactive
30
L
Pullup Resistance
R
V
V
= 75% V
= 25% V
120
120
kΩ
kΩ
EN-H
EN
EN
IN
IN
Pulldown Resistance
RESET
R
EN-L
Threshold Accuracy
Threshold Hysteresis
RESET Open-Drain Leakage
Output Low Voltage
RESET Timeout
V
V
falling
79.5
30
82.5
2.5
85.5
%V
RES
OUT
OUT
V
%V
RES,HYST
OUT
RESET = high impedance, V
= 5mV
200
100
80
nA
RESET
V
t
I
= 250µA
mV
ms
µs
RES,OL
LOAD
CRES = GND
< V
RSOFF
Output Deglitch Time
CRES
t
V
30
10
DEGLITCH
OUT
RES
Charge Current
I
8
1
12
µA
mA
mV
CRES,UP
CRES,DN
CRES,THRS
Discharge Current
Threshold
I
V
RESET goes from low to high impedance
575
600
625
THERMAL PROTECTION
Thermal-Shutdown Temperature
Thermal-Shutdown Hysteresis
T
+165
15
°C
°C
SHDN
ΔT
SHDN
Note 2: Limits are 100% production tested at T = +25°C. Limits over the operating temperature range are guaranteed by design.
A
Note 3: Dropout voltage is defined as V - V
when V
is 2% below its value for V = V
+ 2V.
IN
OUT
OUT
IN
OUT
_______________________________________________________________________________________
3
Ultra-Low Output Voltage, Low-Quiescent-Current
Linear Regulator for High-Temperature Applications
Typical Operating Characteristics
(For devices with V
< 1.5V, V = 3.3V. For devices with V
> 1.5V, V = 5V. EN = IN, C = 1µF, C
= 4.7µF, C
= 1000pF,
OUT
IN
OUT
IN
IN
OUT
CRES
T = + 25°C, unless otherwise noted.)
A
OUTPUT-VOLTAGE ACCURACY
OUTPUT VOLTAGE
vs. INPUT VOLTAGE
OUTPUT-VOLTAGE ACCURACY
vs. TEMPERATURE
vs. LOAD CURRENT
1.004
1.003
1.002
1.001
1.000
0.999
0.998
0.997
0.996
0.995
0.994
0.5
0.4
0.5
V
= 1V
OUT
I
= 1mA
OUT
0.4
0.3
0.2
0.1
0.3
I
= 0.1mA
I
= 0.1mA
OUT
OUT
I
= 1mA
OUT
0.2
MAX169
0.1
V
= 1V
OUT
0
0
-0.1
-0.2
-0.3
-0.4
-0.5
V
= 0.5V
OUT
-0.1
-0.2
-0.3
-0.4
-0.5
I
= 100mA
OUT
I
= 50mA
OUT
I
= 50mA
OUT
V
= 3.3V
OUT
I
= 100mA
5.0
OUT
2.5
3.0
3.5
4.0
4.5
5.5
-50
0
50
TEMPERATURE (°C)
100
150
0
20
40
60
80
100
100
5.5
INPUT VOLTAGE (V)
LOAD CURRENT (mA)
GROUND-PIN CURRENT
vs. LOAD CURRENT
GROUND-PIN CURRENT
vs. INPUT VOLTAGE
GROUND-PIN CURRENT
vs. TEMPERATURE
40
35
30
25
20
15
10
5
50
45
40
35
30
25
20
15
10
5
30
25
20
15
10
5
V
= 0.5V
OUT
I
= 100mA
OUT
I
= 50mA
OUT
V
= 3.3V
OUT
I
= 100mA
OUT
I
= 50mA
OUT
V
= 1V
OUT
I
= 0.1mA
I
= 1mA
OUT
OUT
V
= 0.5V
OUT
I
= 0.1mA
2
I
= 1mA
OUT
OUT
4
V
= 1V
OUT
0
0
0
0
20
40
60
80
0
1
3
5
6
-50 -25
0
25 50 75 100 125 150
TEMPERATURE (°C)
LOAD CURRENT (mA)
INPUT VOLTAGE (V)
CURRENT LIMIT
DROPOUT VOLTAGE
vs. LOAD CURRENT
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
vs. INPUT VOLTAGE
170
165
160
155
150
145
140
135
130
100
90
80
70
60
50
40
30
20
10
0
80
70
60
50
40
30
20
10
0
V
= 3.3V
OUT
V
= 0.5V, I
10
= 10mA
OUT
OUT
2.5
3.0
3.5
4.0
4.5
5.0
0
25
50
75
100
125
150
0.01
0.1
1
100
1000
INPUT VOLTAGE (V)
LOAD CURRENT (mA)
FREQUENCY (kHz)
4
_______________________________________________________________________________________
Ultra-Low Output Voltage, Low-Quiescent-Current
Linear Regulator for High-Temperature Applications
MAX169
Typical Operating Characteristics (continued)
(For devices with V
< 1.5V, V = 3.3V. For devices with V
> 1.5V, V = 5V. EN = IN, C = 1µF, C
= 4.7µF, C
= 1000pF,
OUT
IN
OUT
IN
IN
OUT
CRES
T = + 25°C, unless otherwise noted.)
A
LINE-TRANSIENT RESPONSE NEAR
DROPOUT
LINE-TRANSIENT RESPONSE
MAX16999 toc10
MAX16999 toc11
4V
1.6V
0.6V
V
3.5V
IN
V
IN
100mV/div
AC-COUPLED
200mV/div
AC-COUPLED
V
V
OUT
OUT
V
= 0.5V
V
= 0.5V
OUT
OUT
200μs/div
200μs/div
LOAD-TRANSIENT RESPONSE NEAR
DROPOUT
LOAD-TRANSIENT RESPONSE
MAX16999 toc12
MAX16999 toc13
50mA/div
0
50mA/div
0
I
I
OUT
OUT
OUT
OUT
100mV/div
AC-COUPLED
100mV/div
AC-COUPLED
V
V
V
= 3.3V
V
= 3.3V, V = V
+ 50mV
OUT
OUT
OUT
IN
200μs/div
200μs/div
SHUTDOWN RESPONSE
RESET/ENABLE RESPONSE
MAX16999 toc14
MAX16999 toc15
5V
0
5V
0
V
V
EN
EN
1V
0
V
OUT
1V
0
V
5V
0
RESET
V
OUT
V
= 1V, I
= 50mA
OUT
V
= 1V, I
= 50mA, C
= 15,000pF
CRES
OUT
OUT
OUT
100μs/div
400μs/div
_______________________________________________________________________________________
5
Ultra-Low Output Voltage, Low-Quiescent-Current
Linear Regulator for High-Temperature Applications
Typical Operating Characteristics (continued)
(For devices with V
< 1.5V, V = 3.3V. For devices with V
> 1.5V, V = 5V. EN = IN, C = 1µF, C
= 4.7µF, C
= 1000pF,
OUT
IN
OUT
IN
IN
OUT
CRES
T = + 25°C, unless otherwise noted.)
A
CRES PULLUP CURRENT
vs. TEMPERATURE
LINE/RESET RESPONSE
MAX16999 toc16
20
18
16
14
12
10
8
V
= 1V, C
= 15,000pF
CRES
OUT
V
2V/div
0
IN
MAX169
V
500mV/div
OUT
0
6
V
5V
0
RESET
4
2
V
= 0.5V, I
= 50mA, C
2ms/div
= 15,000pF
CRES
OUT
OUT
0
-50 -25
0
25 50 75 100 125 150
TEMPERATURE (°C)
RESET TIMEOUT
vs. CRES CAPACITANCE
SHORT-CIRCUIT RESPONSE
MAX16999 toc19
30
25
20
15
10
5
V
5V
0
OUT
V
5V
0
RESET
5A
0
I
OUT
V
= 3.3V
OUT
0
0
100
200
300
400
500
200μs/div
CRES CAPACITANCE (nF)
Pin Description
PIN
1, 2
3
NAME
OUT
CRES
RESET
GND
EN
FUNCTION
Regulator Output. Bypass OUT to GND with a 4.7µF ceramic capacitor. OUT becomes high impedance when
EN is low.
POR Timer. Bypass CRES to GND with a ceramic capacitor to define POR timing (see the POR Timer section).
Open-Drain, Active-Low Reset Output. RESET is high impedance when output is in regulation or if the IC is in
4
shutdown. RESET is pulled low when V
drops below 82.5% (typ) of its nominal voltage.
OUT
5
Ground. Connect GND to a large circuit board ground plane and directly to the exposed paddle.
Active-High Enable Input. Drive EN low to place the regulator in standby mode. Drive EN high or connect to IN
for normal operation.
6
7, 8
—
IN
Regulator Input. Bypass IN to GND with at least a 1µF ceramic capacitor.
Exposed Paddle. Connect EP to a large pad or circuit board ground plane to maximize power dissipation. EP
serves as a heatsink.
EP
6
_______________________________________________________________________________________
Ultra-Low Output Voltage, Low-Quiescent-Current
Linear Regulator for High-Temperature Applications
MAX169
ERROR
AMPLIFIER
IN
V
REF
OUT
MAX16999
POR
COMPARATOR
I
GND
CRES,UP
(10μA)
20μs
DEGLITCH
EP
0.825 x V
REF
CRES
100kΩ
I
CRES,DOWN
(10mA)
CRES
COMPARATOR
EN
LOGIC
CONTROL
V
CRES,THRS
RESET
COUNTER
(100ms)
Figure 1. Block Diagram
_______________________________________________________________________________________
7
Ultra-Low Output Voltage, Low-Quiescent-Current
Linear Regulator for High-Temperature Applications
The internal reset timer is set by the value of the exter-
Detailed Description
nal capacitance (C
). Calculate the reset time
CRES
The MAX16999 is a low-quiescent-current linear regula-
tor designed for applications requiring high reliability,
such as automotive applications. This device can supply
loads up to 100mA and is available in factory-preset out-
put voltages from 0.5V to 3.3V (see the Selector Guide).
As illustrated in Figure 1, the MAX16999 linear regulator
consists of a reference, an error amplifier, a p-channel
MOSFET pass transistor, and an internal feedback volt-
age-divider. A power-on reset section signals if the out-
put voltage has come out of regulation. The reset signal
timeout is defined by the charging time of an external
capacitor attached to CRES.
using the following formula:
V
3
A
t
= C
x 60 x 10
POR_DELAY
CRES
where C
is in Farads and the delay to GND is
CRES
given in seconds.
The second timer is an internal fault timer and ensures
the regulator does not stay off indefinitely because of a
fault on CRES such as a short. The fault timer runs for a
maximum of 100ms. A logic block monitors both inter-
nal timers to determine the shortest timeout. If the first
timeout is the fault timer, the pullup current is switched
off in order to avoid unnecessary current consumption
and a resistive pulldown is also activated. If
MAX169
To increase system reliability, the MAX16999 features a
POR reset timeout along with overcurrent and overtem-
perature protection. A power-on reset timeout guaran-
tees startup even with a faulty timing capacitor.
Parameters are guaranteed up to +125°C junction tem-
perature. The EN signal is latched in its last state even
if the signal line becomes disconnected.
t
exceeds 100ms (typ) the fault timer defines
POR_DELAY
the timeout behavior.
Current Limit
Once the output voltage reaches regulation, the output
current is limited to 150mA (typ). If the output current
exceeds the current limit, the output voltage begins to
decrease.
Logic-Controlled Enable
The MAX16999 provides a logic-enable input (EN). For
normal operation drive EN to logic-high. When EN is
driven high, the linear regulator starts to regulate by
increasing the output voltage up to the preset value. To
disable the device, drive EN low to set OUT to high
impedance—this enables a pulldown current from
CRES to discharge the capacitor. Once the device is
disabled, the input supply current reduces to less than
0.3µA. The EN input is latched into its last state by a
120kΩ internal resistor. To change state, the latch
needs to be overridden. When EN is low, the RESET
output is high impedance.
Thermal-Overload Protection
Thermal-overload protection limits total power dissipa-
tion in the MAX16999. When the junction temperature
exceeds +165°C, a thermal sensor turns off the pass
transistor, allowing the IC to cool. The thermal sensor
turns the pass transistor on again after the junction tem-
perature cools by 15°C, resulting in a pulsed output
during continuous thermal-overload conditions.
Thermal-overload protection safeguards the MAX16999
in the event of fault conditions. For continuous opera-
tion, do not exceed the absolute maximum junction-
temperature rating of +150°C. Table 1 lists maximum
DC output currents (milliamps) that are allowed for
POR Timer
Once the output voltage rises above the threshold V
,
RES
two internal timers are simultaneously activated. The
reset timer is realized by means of a pullup current
operation at T = +125°C without causing thermal shut-
A
down of the MAX16999.
I
that charges the capacitor connected to CRES.
CRES,UP
As soon as the voltage on C
rises above the thresh-
RES
old of 600mV (typ), RESET goes high impedance.
8
_______________________________________________________________________________________
Ultra-Low Output Voltage, Low-Quiescent-Current
Linear Regulator for High-Temperature Applications
MAX169
Table 1. Output Currents at T = +125°C
A
Applications Information
Capacitor Selection
Capacitors are required at the MAX16999 input and
output for stable operation over the full temperature
range and with load currents up to 100mA. Connect a
1µF ceramic capacitor between IN and GND and a
4.7µF ceramic capacitor between OUT and GND. The
MULTILAYER
SINGLE-LAYER BOARD
BOARD
V
(V)
OUT
V
IN
= 3.3V
V
IN
= 5V
V
IN
= 5V
(mA)
(mA)
(mA)
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.5
1.8
2.5
3.3
92
57
59
72
73
input capacitor (C ) lowers the source impedance of
IN
95
the input supply. Use larger output capacitors to
reduce noise and improve stability and power-supply
rejection. The output capacitor’s equivalent series
resistance (ESR) affects stability and output noise. Use
output capacitors with an ESR of 30mΩ or less to
ensure stability and optimize transient response.
Surface-mount ceramic capacitors have very low ESR
and are commonly available in values up to 10µF.
99
60
75
100
100
100
100
100
100
100
100
100
61
77
63
79
64
81
66
83
68
85
Connect C and C
as close to the MAX16999 as
IN
OUT
74
92
possible to minimize the impact of the PCB trace induc-
tance.
81
100
100
100
100
100
Using MAX16999 in Parallel
with Another Supply
The MAX16999 can be used in parallel with another
supply of equal voltage (see Figure 2). The circuit
shows a typical low-power solution for a µC.
Undervoltage Lockout (UVLO)
Before the MAX16999 can operate, the input voltage
must exceed the UVLO threshold of 2.2V (max) with a
30mV hysteresis. If the input voltage is below the UVLO
threshold, OUT becomes high impedance and EN is
ignored regardless if it is driven high or low.
4V TO 36V
3.3V, 1A LOW-IQ
INTERFACE SUPPLY
MAX1745
TO μC
1.2V, 3A
CORE SUPPLY
MAX8693
1.2V LOW-IQ
CORE BYPASS
MAX16999
Figure 2. Low-Quiescent µC Supply Solution
_______________________________________________________________________________________
9
Ultra-Low Output Voltage, Low-Quiescent-Current
Linear Regulator for High-Temperature Applications
Selector Guide
Chip Information
PROCESS: BiCMOS
SUFFIX
05*
06
V
(V)
TOP MARK
APM
APN
OUT
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.5
1.8
2.5
3.3
07
APO
APP
Package Information
08
For the latest package outline information, go to
www.maxim-ic.com/packages.
09
APQ
APR
APS
10*
11
PACKAGE TYPE PACKAGE CODE DOCUMENT NO.
MAX169
8 µMAX-EP
U8E+2
21-0107
12
APT
13
APU
15
APV
18
APW
APX
25
33*
APY
*Bold indicates a standard value. For other values, contact fac-
tory for availability. (Nonstandard options require a 5k mini-
mum quantity order).
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
10 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2008 Maxim Integrated Products
is a registered trademark of Maxim Integrated Products, Inc.
Heaney
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