MAX8518EUB [MAXIM]
1.425V to 3.6V Input, 1A, 0.2V Dropout LDO Regulators; 1.425V至3.6V输入， 1A ， 0.2V低压差LDO稳压器
| 型号： | MAX8518EUB |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 1.425V to 3.6V Input, 1A, 0.2V Dropout LDO Regulators |
| 文件： | 总9页 (文件大小：182K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-3188; Rev 1; 4/04
1 .4 2 5 V t o 3 .6 V In p u t , 1 A,
0 .2 V Dro p o u t LDO Re g u la t o rs
x
Ge n e ra l De s c rip t io n
Fe a t u re s
The MAX8516/MAX8517/MAX8518 low-dropout linear
regulators operate from input voltages as low as 1.425V
and are able to deliver up to 1A of continuous output
current with a maximum dropout voltage of only 200mV.
♦ 1.425V to 3.6V Input Voltage Range
♦ Guaranteed 200mV Dropout at 1A Output Current
♦ ±1.4% Output Accuracy Over Load, Line, and
Temperature (0°C to +85°C), ±0.6% Initial Accuracy
♦ Compatible with Ceramic Capacitors
The output voltage can be set from 0.5V to (V - 0.2V)
IN
and is 1.4% accurate over load and line variations, from
0°C to +85°C.
♦ Fast Transient Response
These regulators use small, 1µF ceramic input capaci-
tors and 4.7µF ceramic output capacitors to deliver 1A
output current. High bandwidth provides excellent tran-
sient response and limits the output voltage deviation to
45mV for a 20mA to 1A load step, with only a 4.7µF
ceramic output capacitor, and the voltage deviations can
be reduced further by increasing the output capacitor.
♦ 320µA Operating Supply Current
♦ <25µA Shutdown Supply Current
♦ Short-Circuit Protection
♦ Thermal-Overload Protection
♦ Soft-Start Limits Inrush Current
Designed with an internal p-channel MOSFET pass
transistor, the MAX8516/MAX8517/MAX8518 feature
low 340µA (typ) supply current during dropout condi-
tions. Soft-start reduces inrush current. Other features
include a logic-controlled shutdown mode, short-circuit
protection, and thermal-overload protection.
Ord e rin g In fo rm a t io n
PART
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
10 µMAX
MAX8516EUB
MAX8517EUB
MAX8518EUB
10 µMAX
The MAX8517 features a power-OK (POK) output that
transitions high when the regulator output is within
± 10% of its nomina l outp ut volta g e . The MAX8518
features a 150ms power-on reset output.
The parts are packaged in a 10-pin µMAX® package that
includes an exposed pad for optimal power dispation.
10 µMAX
Typ ic a l Op e ra t in g Circ u it
INPUT
1.425V TO 3.6V
OUTPUT
0.5V TO (V - 0.2V), 1A
IN
IN_
OUT_
1µF
Ap p lic a t io n s
MAX8516
MAX8517
MAX8518
Servers
Post Regulators
Notebooks
PDAs
POWER-ON RESET
POWER-OK
4.7µF
Storage
POR (MAX8518)
POK (MAX8517)
EN
FB
Networking
Base Stations
Optical Modules
ATE
ON
GND
OFF
µMAX is a registered trademark of Maxim Integrated Products, Inc.
P in Co n fig u ra t io n s
TOP VIEW
EN
IN
1
2
3
4
5
10 N.C.
EN
IN
1
2
3
4
5
10 N.C.
EN
IN
1
2
3
4
5
10 N.C.
9
8
7
6
OUT
OUT
FB
9
8
7
6
OUT
OUT
FB
9
8
7
6
OUT
OUT
FB
MAX8516
MAX8517
MAX8518
IN
IN
IN
N.C.
N.C.
POK
N.C.
N.C.
POR
GND
GND
GND
µMAX
µMAX
µMAX
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 .4 2 5 V t o 3 .6 V In p u t , 1 A,
0 .2 V Dro p o u t LDO Re g u la t o rs
ABSOLUTE MAXIMUM RATINGS
IN, EN, POK (MAX8517), POR (MAX8518),
Operating Temperature Range ...........................-40°C to +85°C
FB to GND .........................................................-0.3V to +4.0V
OUT to GND ..................................................-0.3V to (IN + 0.3V)
Output Short-Circuit Duration.....................................Continuous
Continuous Power Dissipation
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
(T = +70°C, EP soldered to PC board ground)
A
10-Pin µMAX (derate 10.3mW/°C above +70°C) .........824mW
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.
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1. V = +1.8V, V
= +1.5V, EN = IN, I
= 1mA, T = -40°C to +85°C, unless otherwise noted.) (Note 1)
OUT A
IN
OUT
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
IN
Input Voltage Range
Input Undervoltage Lockout
OUT
1.425
1.32
3.600
1.38
V
V
V
IN
rising, 70mV hysteresis
1.35
Output Voltage Range
Load Regulation
Line Regulation
0.5
-0.15
1.6
3.4
V
%/A
%/V
mV
A
I
= 1mA to 1A
0.1
0
OUT
V
= 1.425V to 3.6V, V
= 1.225V, I = 1mA
OUT
+0.15
200
2.4
IN
OUT
Dropout Voltage (V - V
)
V
= 1.425V, I
= 1A, V = 480mV
100
2
IN
OUT
IN
OUT
FB
Current Limit
V
= 3.6V, V = 3V, V = 480mV
OUT FB
IN
Output Shutdown Leakage
V
IN
= 3.6V, V
= 0, V = 0
0.25
25
µA
OUT
EN
FB
I
= 10mA, T = +85°C
497
493
500
503
507
1
OUT
A
FB Threshold Accuracy
mV
µA
V
= 1.225V to 3V, V = V + 0.2V to 3.6V,
OUT
OUT
IN
I
= 1mA to 1A
OUT
FB Input Bias Current
V
= 0.5V, V = 3.6V
0.001
FB
IN
GND
V
= 3.6V, V
= 3V, I = 100mA
OUT
320
340
0.25
IN
OUT
GND Supply Current
µA
µA
Dropout, V = 3.6V, V = 480mV
600
25
IN
FB
GND Shutdown Current
V
IN
= 3.6V, EN = GND
POK (MAX8517 ONLY)
FB high
FB low
540
440
550
450
25
560
460
200
1
V
V
HYS
moving out of regulation,
= 10mV, IN = 1.425V to 3.6V
FB
POK Threshold
mV
POK Output Voltage Low
POK Output Current High
POK Fault Delay Time
V
FB
= 0.4V or 0.6V, I
= 1mA
mV
µA
µs
POK
V
POK
= 3.6V
0.001
50
From FB to POK
25
100
2
_______________________________________________________________________________________
1 .4 2 5 V t o 3 .6 V In p u t , 1 A,
0 .2 V Dro p o u t LDO Re g u la t o rs
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1. V = +1.8V, V
= +1.5V, EN = IN, I = 1mA, T = -40°C to +85°C, unless otherwise noted.) (Note 1)
OUT A
IN
OUT
PARAMETER
POR (MAX8518 ONLY)
POR Reset Threshold
POR Output Voltage Low
POR Output Current High
POR Rising Delay Time
EN
CONDITIONS
MIN
TYP
MAX
UNITS
V
falling, V
= 10mV, V = 1.425V to 3.6V
440
450
25
460
200
1
mV
mV
µA
ms
FB
HYS
IN
V
FB
= 0.4V or 0.6V, I
= 1mA
POR
V
POR
= 3.6V
0.001
150
From FB to POR
105
210
EN rising
EN falling
1.2
+1
Enable Input Threshold
V
= 1.425V to 3.6V
V
IN
0.4
-1
Enable Input Bias Current
V
EN
= 0 or 3.6V
µA
THERMAL SHUTDOWN
T rising
+165
+150
J
Thermal-Shutdown Threshold
Output on or off
°C
T falling
J
OUTPUT TRANSIENT
Load Transient
I
= 20mA to 1A to 20mA, t
= t = 1µs
FALL
3
3
%
%
OUT
RISE
Line Transient
δV = 0.5V, t
= t
= 5µs
IN
RISE
FALL
Note 1: Specifications to -40°C are guaranteed by design, not production tested.
Note 2: Measurements at high current are pulse tested, such that the junction temperature is ambient temperature. Minimum supply
voltage for output accuracy must be at least 1.425V.
Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s
= 4.7µF, C = 1µF, T = +25°C.)
OUT IN A
(Circuit of Figure 1, V = +1.8V, V
= +1.5V, I
= 1A, C
OUT
OUT
IN
OUTPUT VOLTAGE
vs. INPUT VOLTAGE
OUTPUT VOLTAGE
vs. LOAD CURRENT
GROUND CURRENT
vs. INPUT VOLTAGE
1.502
1.60
1.55
1.50
1.45
1.40
1.35
1.30
500
400
300
200
100
0
T = -40°C TO +85°C
A
T = +85°C
A
I
= 1A
LOAD
1.500
1.498
1.496
1.494
1.492
1.490
T = +25°C
A
I
= 0.5A
LOAD
T = -40°C
A
I
= 0A
LOAD
0
200
400
600
800 1000 1200
0
0.6
1.2
1.8
2.4
3.0
3.6
0
0.6
1.2
1.8
2.4
3.0
3.6
LOAD CURRENT (mA)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
_______________________________________________________________________________________
3
1 .4 2 5 V t o 3 .6 V In p u t , 1 A,
0 .2 V Dro p o u t LDO Re g u la t o rs
Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s (c o n t in u e d )
(Circuit of Figure 1, V = +1.8V, V
= +1.5V, I
= 1A, C
= 4.7µF, C = 1µF, T = +25°C.)
OUT
OUT
OUT
IN
A
IN
GROUND CURRENT
vs. LOAD CURRENT
DROPOUT VOLTAGE
vs. LOAD CURRENT
375
350
325
300
275
250
125
100
75
50
25
0
T = +85°C
A
T = +25°C
A
T = -40°C
A
0
200
400
600
800 1000 1200
0
200
400
600
800
1000
LOAD CURRENT (mA)
LOAD CURRENT (mA)
LINE INPUT TRANSIENT
LOAD-TRANSIENT RESPONSE
(I = 0.1A TO 1A)
(V = +1.8V TO +2.5V, I
IN
= 1A)
LOAD
LOAD
MAX8516/17/18 toc06
MAX8516/17/18 toc07
V
OUT
V
OUT
AC-COUPLED
20mV/div
AC-COUPLED
50mV/div
V
IN
I
LOAD
AC-COUPLED
0.5V/div
1A/div
C
= 220µF ELECTROLYTIC
IN
CAP CLOSE TO IN
100µs/div
40µs/div
PSRR vs. FREQUENCY (MAX8516)
SHUTDOWN RESPONSE
MAX8516/17/18 toc08
80
70
60
50
40
30
20
10
0
V
1V/div
OUT
I
IN
1A/div
EN
2V/div
I
= 100mA
0.1
LOAD
0.01
1
10
100
1000
100µs/div
FREQUENCY (kHz)
4
_______________________________________________________________________________________
1 .4 2 5 V t o 3 .6 V In p u t , 1 A,
0 .2 V Dro p o u t LDO Re g u la t o rs
Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s (c o n t in u e d )
(Circuit of Figure 1, V = +1.8V, V
= +1.5V, I
= 1A, C
= 4.7µF, C = 1µF, T = +25°C.)
OUT
OUT
OUT
IN
A
IN
FB VOLTAGE vs. TEMPERATURE
OUTPUT RIPPLE VOLTAGE
MAX8516/17/18 toc11
502
501
500
499
498
V
OUT
AC-COUPLED
1mV/div
I
= 10mA
LOAD
-40
-15
10
35
60
85
100µs/div
TEMPERATURE (°C)
OVERCURRENT THRESHOLD
vs. TEMPERATURE
SHORT-CIRCUIT CURRENT
MAX8516/17/18 toc13
1.95
1.90
1.85
1.80
1.75
V
1V/div
OUT
I
OUT
2A/div
100µs/div
-40
-15
10
35
60
85
TEMPERATURE (°C)
CASE TEMPERATURE
vs. LOAD CURRENT
75
60
45
30
15
0
V
IN
= 2.5V; T = +25°C
A
0
200
400
600
800
1000
LOAD CURRENT (mA)
_______________________________________________________________________________________
5
1 .4 2 5 V t o 3 .6 V In p u t , 1 A,
0 .2 V Dro p o u t LDO Re g u la t o rs
P in De s c rip t io n
PIN
NAME
DESCRIPTION
MAX8516
MAX8517
MAX8518
Enable Input. Set low to place the device in low-current shutdown mode. Set
high for normal operation.
1
1
1
EN
IN
Regulator Input. V can range from +1.425V to +3.6V. Bypass with a 1µF or
IN
higher ceramic capacitor to GND.
2, 3
2, 3
2, 3
No Connection. Pin 10 is internally pulled down to GND with a 10kΩ resistor.
Leave floating.
4, 5, 10
5, 10
4, 10
N.C.
6
7
6
7
6
7
GND
FB
Ground
Feedback Pin. Connect to output through a voltage-divider to set the output.
Regulator Output. Bypass with a 4.7µF ceramic capacitor to GND (a smaller
8, 9
—
8, 9
4
8, 9
—
5
OUT
POK
capacitor can be used if maximum load is less than 1A, i.e., C
(max) ✕ (1µF/200mA).
= I
OUT
OUT
Power-OK Output (MAX8517 Only). Open-drain output. Connect to a positive
supply with a pullup resistor. If not used, leave pin unconnected. See the
Detailed Description.
Power-On Reset Output. Open-drain output. Connect to a positive supply with
a pullup resistor. If not used, leave pin unconnected (see the Detailed
Description for more details).
—
—
POR
GND
Exposed Pad on the Underside of the Package. Solder to the ground plane for
proper heat dissipation.
EP
Fu n c t io n a l Dia g ra m
IN
THRESHOLD
OVERTHERMAL
PROTECTION
UNDERVOLTAGE
LOCKOUT
0.50V
0.55V
0.45V
ERROR AMP
MOS DRIVER
WITH I
WITH
REF
LIMIT
SOFT-START
OVERTHERMAL
PROTECTION
EN
OUT
FB
MAX8516
MAX8517
MAX8518
POK
(MAX8517 ONLY)
POR
(MAX8518 ONLY)
GND
6
_______________________________________________________________________________________
1 .4 2 5 V t o 3 .6 V In p u t , 1 A,
0 .2 V Dro p o u t LDO Re g u la t o rs
Ou t p u t Vo lt a g e S e le c t io n
De t a ile d De s c rip t io n
The MAX8516/MAX8517/MAX8518 fe a ture a n
adjustable output voltage from 0.5V to 3.4V, using two
external resistors connected as a voltage-divider to FB
as shown in Figure 1. The output voltage is set by the
following equation:
The MAX8516/MAX8517/MAX8518 are low-input, low-
dropout, PMOS regulators capable of delivering up to
1A of output current with as little as 200mV of headroom
from input to output. The PMOS output stage can be dri-
ven from input voltages down to +1.425V without sacri-
ficing stability or transient performance. Since these
regulators have a PMOS output device, supply current
is not a significant function of load or input headroom.
R1
R2
⎛
⎜
⎝
⎞
⎟
⎠
V
= V
1 +
OUT
FB
In t e rn a l P -Ch a n n e l P a s s Tra n s is t o r
The MAX8516/MAX8517/MAX8518 feature a 100mΩ (typ)
p -c ha nne l MOSFET p a s s tra ns is tor. Unlike s imila r
designs using PNP pass transistors, p-channel MOSFETs
require no base drive, which reduces quiescent current.
PNP-based regulators also waste considerable current in
dropout when the pass transistor saturates and use high
base-drive currents under large loads. The MAX8516/
MAX8517/MAX8518 do not suffer from these problems
and consume only 340µA (typ) of quiescent current
under heavy loads, as well as in dropout.
where typically V = 0.5V. Choose R2 ≤ 5kΩ to opti-
FB
mize quiescent current, accuracy, and high-frequency
power-supply rejection. To simplify resistor selection:
⎛
⎞
V
OUT
R1 = R2
− 1
⎜
⎟
V
⎝
⎠
FB
S o ft -S t a rt
Inherent soft-start limits inrush current. Peak inrush cur-
rent is dependent on the value of C
culated as follows:
and can be cal-
OUT
S h o rt -Circ u it /Th e rm a l Fa u lt P ro t e c t io n
The MAX8516/MAX8517/MAX8518 are fully protected
from a short circuit at the output through current-limiting
and thermal-overload circuitry. In the fault condition
when the output is shorted to ground, the output current
is limited to 2A. Under these conditions, the part quickly
he a ts up . Whe n the junc tion te mp e ra ture re a c he s
+165°C, the thermal-overload circuitry turns off the
output, allowing the part to cool down. When the junction
temperature cools to +150°C, the output turns back on
and tries to reestablish regulation. Current limiting and
thermal protection continue until the fault is removed. For
continuous operation, do not exceed the absolute maxi-
⎛
⎞
C
(µF)
OUT
66
I
= I
+
⎜
⎟
INRUSH
LOAD
⎝
⎠
S h u t d o w n Mo d e
The MAX8516/MAX8517/MAX8518 include an enable
input. To shut down the device, pull EN to GND. For
normal operation, connect the EN to IN. During shut-
down, an internal 10kΩ resistor pulls down the output.
P o w e r-OK (MAX8 5 1 7 On ly)
The MAX8517 features a power-OK (POK) output to
indicate the status of the output. POK remains high
when the regulator output is within ±10% of its nominal
output voltage. If the output voltage falls or rises out-
side this range, POK transitions low. This open-drain
output requires an external pullup resistor to IN. An
internal delay circuit prevents POK from switching for
50µs (typ) after the trip threshold is initially reached. If
the part is in shutdown mode, POK is low.
mum junction-temperature rating of T = +150°C.
J
ADJUSTABLE
OUTPUT
+1.425V TO +3.6V
IN
IN
OUT
OUT
1µF
MAX8516
MAX8517
MAX8518
R1
R2
P o w e r-On Re s e t (MAX8 5 1 8 On ly)
The MAX8518 features a power-on reset (POR) output
that transitions high 140ms (typ) after the output has
risen above 90% of its final value. This open-drain out-
put requires an external pullup resistor to IN. If the part
is in shutdown mode, falls below 90% of the nominal
output voltage, or experiences a short-circuit or thermal
fault, POR immediately transitions low.
4.7µF
100kΩ*
FB
POK (MAX8517) OR
POR (MAX8518)
ENABLE
EN
GND
SHUTDOWN
*FOR MAX8517 AND MAX8518
Figure 1. Typical Application Circuit
_______________________________________________________________________________________
7
1 .4 2 5 V t o 3 .6 V In p u t , 1 A,
0 .2 V Dro p o u t LDO Re g u la t o rs
Op e ra t in g Re g io n a n d P o w e r Dis s ip a t io n
The maximum power dissipation depends on the ther-
mal resistance of the IC package and circuit board, the
temperature difference between the die junction and
ambient air, and the rate of airflow. The power dissipat-
No is e , P S RR, a n d Tra n s ie n t Re s p o n s e
The MAX8516/MAX8517/MAX8518 a re d e s ig ne d to
operate with low dropout voltages and low quiescent
currents while still maintaining good noise, transient
response, and AC rejection (see the Typical Operating
Characteristics for a plot of Power-Supply Rejection
Ratio (PSRR) vs. Frequency). When operating from
noisy sources, improved supply-noise rejection and
transient response can be achieved by increasing the
values of the input and output bypass capacitors and
through passive filtering techniques. The MAX8516/
MAX8517/MAX8518 load-transient response graphs
(see the Typical Operating Characteristics) show two
components of the output response: a DC shift from the
output impedance due to the load current change, and
the transient response. A typical transient overshoot for
a step change in the load current from 20mA to 1A is
45mV. Use larger output ceramic capacitors greater
than 4.7µF up to 50µF to attenuate the overshoot.
ed in the device is P = I
✕ (V - V ).
OUT
IN OUT
The package features an exposed thermal pad on its
underside. This pad lowers the thermal resistance of
the package by providing a direct heat conduction
path from the die to the PC board.
Additionally, the ground pins (GND) perform the dual
function of providing an electrical connection to system
g round a nd c ha nne ling he a t a wa y. Conne c t the
exposed backside pad and GND to the system ground
using a large pad or ground plane, or multiple vias to
the ground plane layer.
Ap p lic a t io n s In fo rm a t io n
Ca p a c it o r S e le c t io n a n d
Re g u la t o r S t a b ilit y
Ch ip In fo rm a t io n
TRANSISTOR COUNT: 2849
Capacitors are required at the MAX8516/MAX8517/
MAX8518 inputs and outputs for stable operation over the
full temperature range and with load currents up to 1A.
Connect a 1µF capacitor between IN and ground and a
4.7µF capacitor with low equivalent series resistance
(ESR) between OUT and ground for 1A output current.
PROCESS: BiCMOS
The input capacitor (C ) lowers the source impedance of
IN
the input supply. If input-supply source impedance is
high, place a larger input capacitor close to IN to prevent
V
IN
sagging due to load transients. Smaller output capac-
itors can be used for output currents less than 1A.
Calculate C
as follows:
OUT
C
= I
× (1µF / 200mA)
OUT
OUT(MAX)
8
_______________________________________________________________________________________
1 .4 2 5 V t o 3 .6 V In p u t , 1 A,
0 .2 V Dro p o u t LDO Re g u la t o rs
P a c k a g e In fo rm a t io n
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
PACKAGE OUTLINE, 10L uMAX, EXPOSED PAD
1
21-0109
C
1
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.
Ma x im In t e g ra t e d P ro d u c t s , 1 2 0 S a n Ga b rie l Drive , S u n n yva le , CA 9 4 0 8 6 4 0 8 -7 3 7 -7 6 0 0 _____________________ 9
© 2004 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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MAXIM
MAX851CSA
Switched Capacitor Regulator, 0.005A, 100kHz Switching Freq-Max, CMOS, PDSO8, 0.150 INCH, PLASTIC, SOIC-8
MAXIM
MAX851ESA-T
Switched Capacitor Regulator, 0.005A, 120kHz Switching Freq-Max, CMOS, PDSO8, PLASTIC, SOP-8
MAXIM
MAX851ISA+
Switched Capacitor Regulator, 0.005A, 120kHz Switching Freq-Max, BIPolar, PDSO8, PLASTIC, SOP-8
MAXIM
MAX851ISA-T
Switched Capacitor Regulator, 0.005A, 120kHz Switching Freq-Max, BIPolar, PDSO8, PLASTIC, SOP-8
MAXIM
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