General Description
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 cur-
rent with a maximum dropout voltage of only 200mV. The
output voltage can be set from 0.5V to (VIN - 0.2V) and
is 1.4% accurate over load and line variations, from 0°C
to +85°C.
These regulators use small, 1μF ceramic input capacitors
and 4.7μF ceramic output capacitors to deliver 1A out-
put current. High bandwidth provides excellent transient
response and limits the output voltage deviation to 45mV
for a 20mA to 1A load step, with only a 4.7μF ceramic out-
put capacitor, and the voltage deviations can be reduced
further by increasing the output capacitor.
Designed with an internal p-channel MOSFET pass
transistor, the MAX8516/MAX8517/MAX8518 feature low
340μA (typ) supply current during dropout conditions.
Soft-start reduces inrush current. Other features include
a logic-controlled shutdown mode, short-circuit protection,
and thermal-overload protection.
The MAX8517 features a power-OK (POK) output that
transitions high when the regulator output is within ±10%
of its nominal output voltage. 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.
Applications
Features
●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
● Fast Transient Response
● 320μA Operating Supply Current
● <25μA Shutdown Supply Current
●Short-Circuit Protection
●Thermal-Overload Protection
●Soft-Start Limits Inrush Current
19-3188; Rev 3; 4/16
μMAX is a registered trademark of Maxim Integrated Products, Inc.
●Servers
●Storage
●Networking
●Base Stations
●Optical Modules
●Post Regulators
●Notebooks
●PDAs
●ATE
1
0
µ
M
A
X
3
m
m
x
5
m
m
PART TEMP RANGE PIN-PACKAGE
MAX8516EUB -40°C to +85°C 10 µMAX
MAX8517EUB -40°C to +85°C 10 µMAX
MAX8517EUB/V+ -40°C to +85°C 10 µMAX
MAX8518EUB -40°C to +85°C 10 µMAX
/V Denotes an automotive qualified part.
+Denotes lead(Pb)-free/RoHS-compliant package.
MAX8516
MAX8517
MAX8518
1µF
4.7µF
INPUT
1.425V TO 3.6V
OUTPUT
0.5V TO (VIN - 0.2V), 1A
POWER-ON RESET
POWER-OK
ON
OFF
IN_
POR (MAX8518)
POK (MAX8517)
EN GND
FB
OUT_
1
2
3
4
5
10
9
8
7
6
N.C.
OUT
OUT
FBN.C.
IN
IN
EN
MAX8516
µMAX
TOP VIEW
GNDN.C.
1
2
3
4
5
10
9
8
7
6
N.C.
OUT
OUT
FBPOK
IN
IN
EN
MAX8517
µMAX
GNDN.C.
1
2
3
4
5
10
9
8
7
6
N.C.
OUT
OUT
FBN.C.
IN
IN
EN
MAX8518
µMAX
GNDPOR
MAX8516/MAX8517/
MAX8518
1.425V to 3.6V Input, 1A,
0.2V Dropout LDO Regulators
Ordering Information
Typical Operating Circuit
Pin Congurations
EVALUATION KIT AVAILABLE
IN, EN, POK (MAX8517), POR (MAX8518),
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
(TA = +70°C, EP soldered to PC board ground)
10-Pin μMAX (derate 10.3mW/°C above +70°C) ........824mW
Operating Temperature Range ........................... -40°C to +85°C
Junction Temperature ...................................................... +150°C
Storage Temperature Range ............................ -65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (soldering, 10s) ..........................+240°C
(Circuit of Figure 1. VIN = +1.8V, VOUT = +1.5V, EN = IN, IOUT = 1mA, TA = -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETER CONDITIONS MIN TYP MAX UNITS
IN
Input Voltage Range 1.425 3.600 V
Input Undervoltage Lockout VIN rising, 70mV hysteresis 1.32 1.35 1.38 V
OUT
Output Voltage Range 0.5 3.4 V
Load Regulation IOUT = 1mA to 1A 0.1 %/A
Line Regulation VIN = 1.425V to 3.6V, VOUT = 1.225V, IOUT = 1mA -0.15 0 +0.15 %/V
Dropout Voltage (VIN - VOUT) VIN = 1.425V, IOUT = 1A, VFB = 480mV 100 200 mV
Current Limit VIN = 3.6V, VOUT = 3V, VFB = 480mV 1.6 2 2.4 A
Output Shutdown Leakage VIN = 3.6V, VOUT = 0, VEN = 0 0.25 25 µA
FB
FB Threshold Accuracy
IOUT = 10mA, TA = +85°C 497 500 503
mV
VOUT = 1.225V to 3V, VIN = VOUT + 0.2V to 3.6V,
IOUT = 1mA to 1A 493 507
FB Input Bias Current VFB = 0.5V, VIN = 3.6V 0.001 1 µA
GND
GND Supply Current VIN = 3.6V, VOUT = 3V, IOUT = 100mA 320 µA
Dropout, VIN = 3.6V, VFB = 480mV 340 600
GND Shutdown Current VIN = 3.6V, EN = GND 0.25 25 µA
POK (MAX8517 ONLY)
POK Threshold VFB moving out of regulation,
VHYS = 10mV, IN = 1.425V to 3.6V
FB high 540 550 560 mV
FB low 440 450 460
POK Output Voltage Low VFB = 0.4V or 0.6V, IPOK = 1mA 25 200 mV
POK Output Current High VPOK = 3.6V 0.001 1 µA
POK Fault Delay Time From FB to POK 25 50 100 µs
MAX8516/MAX8517/
MAX8518
1.425V to 3.6V Input, 1A,
0.2V Dropout LDO Regulators
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Absolute Maximum Ratings
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. VIN = +1.8V, VOUT = +1.5V, EN = IN, IOUT = 1mA, TA = -40°C to +85°C, unless otherwise noted.) (Note 1)
Note 1: Specifications to TA = -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.
(Circuit of Figure 1, VIN = +1.8V, VOUT = +1.5V, IOUT = 1A, COUT = 4.7μF, CIN = 1μF, TA = +25°C.)
PARAMETER CONDITIONS MIN TYP MAX UNITS
POR (MAX8518 ONLY)
POR Reset Threshold VFB falling, VHYS = 10mV, VIN = 1.425V to 3.6V 440 450 460 mV
POR Output Voltage Low VFB = 0.4V or 0.6V, IPOR = 1mA 25 200 mV
POR Output Current High VPOR = 3.6V 0.001 1 µA
POR Rising Delay Time From FB to POR 105 150 210 ms
EN
Enable Input Threshold VIN = 1.425V to 3.6V EN rising 1.2 V
EN falling 0.4
Enable Input Bias Current VEN = 0 or 3.6V -1 +1 µA
THERMAL SHUTDOWN
Thermal-Shutdown Threshold Output on or off TJ rising +165 °C
TJ falling +150
OUTPUT TRANSIENT
Load Transient IOUT = 20mA to 1A to 20mA, tRISE = tFALL = 1µs 3 %
Line Transient δVIN = 0.5V, tRISE = tFALL = 5µs 3 %
OUTPUT VOLTAGE
vs. LOAD CURRENT
MAX8516/17/18 toc02
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
800600400200
1.492
1.494
1.496
1.498
1.500
1.502
1.490
0 1000 1200
TA = +85°C
TA = +25°C
TA = -40°C
GROUND CURRENT
vs. INPUT VOLTAGE
MAX8516/17/18 toc03
INPUT VOLTAGE (V)
GROUND CURRENT (µA)
3.02.40.6 1.2 1.8
100
200
300
400
500
0
0 3.6
ILOAD = 1A
ILOAD = 0.5A
ILOAD = 0A
OUTPUT VOLTAGE
vs. INPUT VOLTAGE
MAX8516/17/18 toc01
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
3.02.41.81.20.6
1.35
1.40
1.45
1.50
1.55
1.60
1.30
0 3.6
TA = -40°C TO +85°C
MAX8516/MAX8517/
MAX8518
1.425V to 3.6V Input, 1A,
0.2V Dropout LDO Regulators
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Electrical Characteristics (continued)
Typical Operating Characteristics
(Circuit of Figure 1, VIN = +1.8V, VOUT = +1.5V, IOUT = 1A, COUT = 4.7μF, CIN = 1μF, TA = +25°C.)
DROPOUT VOLTAGE
vs. LOAD CURRENT
MAX8516/17/18 toc05
LOAD CURRENT (mA)
DROPOUT VOLTAGE (mV)
800600400200
25
50
75
100
125
0
0 1000
LINE INPUT TRANSIENT
(VIN = +1.8V TO +2.5V, ILOAD = 1A)
MAX8516/17/18 toc06
100µs/div
VOUT
AC-COUPLED
20mV/div
VIN
AC-COUPLED
0.5V/div
LOAD-TRANSIENT RESPONSE
(ILOAD = 0.1A TO 1A)
MAX8516/17/18 toc07
40µs/div
VOUT
AC-COUPLED
50mV/div
ILOAD
1A/div
CIN = 220µF ELECTROLYTIC
CAP CLOSE TO IN
SHUTDOWN RESPONSE
MAX8516/17/18 toc08
100µs/div
VOUT
1V/div
EN
2V/div
IIN
1A/div
GROUND CURRENT
vs. LOAD CURRENT
MAX8516/17/18 toc04
LOAD CURRENT (mA)
GROUND CURRENT (µA)
1000800600400200
275
300
325
350
375
250
0 1200
TA = +25°C
TA = -40°C
TA = +85°C
PSRR vs. FREQUENCY (MAX8516)
MAX8516/17/18 toc09
FREQUENCY (kHz)
PSRR (dB)
1001010.1
10
20
30
40
50
60
70
80
0
0.01 1000
ILOAD = 100mA
MAX8516/MAX8517/
MAX8518
1.425V to 3.6V Input, 1A,
0.2V Dropout LDO Regulators
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Typical Operating Characteristics (continued)
(Circuit of Figure 1, VIN = +1.8V, VOUT = +1.5V, IOUT = 1A, COUT = 4.7μF, CIN = 1μF, TA = +25°C.)
FB VOLTAGE vs. TEMPERATURE
MAX8516/17/18 toc10
TEMPERATURE (°C)
FB VOLTAGE (mV)
603510-15
499
500
501
502
498
-40 85
ILOAD = 10mA
OUTPUT RIPPLE VOLTAGE
MAX8516/17/18 toc11
100µs/div
VOUT
AC-COUPLED
1mV/div
OVERCURRENT THRESHOLD
vs. TEMPERATURE
MAX8516/17/18 toc12
TEMPERATURE (°C)
OVERCURRENT THRESHOLD (A)
603510-15
1.80
1.85
1.90
1.95
1.75
-40 85
SHORT-CIRCUIT CURRENT
MAX8516/17/18 toc13
100µs/div
VOUT
1V/div
IOUT
2A/div
CASE TEMPERATURE
vs. LOAD CURRENT
MAX8516/17/18 toc14
LOAD CURRENT (mA)
CASE TEMPERATURE (°C)
800600400200
15
30
45
60
75
0
0 1000
VIN = 2.5V; TA = +25°C
MAX8516/MAX8517/
MAX8518
1.425V to 3.6V Input, 1A,
0.2V Dropout LDO Regulators
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Typical Operating Characteristics (continued)
PIN NAME DESCRIPTION
MAX8516 MAX8517 MAX8518
1 1 1 EN Enable Input. Set low to place the device in low-current shutdown mode. Set
high for normal operation.
2, 3 2, 3 2, 3 IN Regulator Input. VIN can range from +1.425V to +3.6V. Bypass with a 1µF or
higher ceramic capacitor to GND.
4, 5, 10 5, 10 4, 10 N.C. No Connection. Pin 10 is internally pulled down to GND with a 10kΩ resistor.
Leave oating.
6 6 6 GND Ground
7 7 7 FB Feedback Pin. Connect to output through a voltage-divider to set the output.
8, 9 8, 9 8, 9 OUT Regulator Output. Bypass with a 4.7µF ceramic capacitor to GND (a smaller
capacitor can be used if maximum load is less than 1A, i.e., COUT = IOUT
(max) x (1µF/200mA).
— 4 — POK
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.
— — 5 POR
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).
EP GND Exposed Pad on the Underside of the Package. Solder to the ground plane for
proper heat dissipation.
MAX8516
MAX8517
MAX8518
POK
(MAX8517 ONLY)
POR
(MAX8518 ONLY)
GND
REF
OVERTHERMAL
PROTECTION
OVERTHERMAL
PROTECTION
EN
IN
UNDERVOLTAGE
LOCKOUT
THRESHOLD
0.55V
0.45V
0.50V
ERROR AMP
WITH
SOFT-START
MOS DRIVER
WITH ILIMIT
OUT
FB
MAX8516/MAX8517/
MAX8518
1.425V to 3.6V Input, 1A,
0.2V Dropout LDO Regulators
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Pin Description
Functional Diagram
Detailed Description
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 driven
from input voltages down to +1.425V without sacrificing
stability or transient performance. Since these regulators
have a PMOS output device, supply current is not a sig-
nificant function of load or input headroom.
Internal P-Channel Pass Transistor
The MAX8516/MAX8517/MAX8518 feature a 100mΩ
(typ) p-channel MOSFET pass transistor. Unlike similar
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.
Short-Circuit/Thermal Fault Protection
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 lim-
ited to 2A. Under these conditions, the part quickly heats
up. When the junction temperature reaches +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 contin-
ue until the fault is removed. For continuous operation, do
not exceed the absolute maximum junction-temperature
rating of TJ = +150°C.
Output Voltage Selection
The MAX8516/MAX8517/MAX8518 feature an adjust-
able 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:
OUT FB R1
V V 1 R2
= +
where typically VFB = 0.5V. Choose R2 ≤ 5kΩ to optimize
quiescent current, accuracy, and high-frequency power-
supply rejection. To simplify resistor selection:
OUT
FB
V
R1 R 2 1
V−
=
Soft-Start
Inherent soft-start limits inrush current. Peak inrush cur-
rent is dependent on the value of COUT and can be cal-
culated as follows:
OUT
INRUSH LOAD C (µF)
I I 66
= +
Shutdown Mode
The MAX8516/MAX8517/MAX8518 include an enable
input. To shut down the device, pull EN to GND. For nor-
mal operation, connect the EN to IN. During shutdown, an
internal 10kΩ resistor pulls down the output.
Power-OK (MAX8517 Only)
The MAX8517 features a power-OK (POK) output to indi-
cate the status of the output. POK remains high when the
regulator output is within ±10% of its nominal output volt-
age. If the output voltage falls or rises outside 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.
Power-On Reset (MAX8518 Only)
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 output
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.
Figure 1. Typical Application Circuit
MAX8516
MAX8517
MAX8518
1µF
4.7µF
ENABLE
SHUTDOWN
IN
IN
POK (MAX8517) OR
POR (MAX8518)
EN GND
FB
OUT
OUT
100kΩ*
R1
R2
ADJUSTABLE
OUTPUT
*FOR MAX8517 AND MAX8518
+1.425V TO +3.6V
MAX8516/MAX8517/
MAX8518
1.425V to 3.6V Input, 1A,
0.2V Dropout LDO Regulators
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Operating Region and Power Dissipation
The maximum power dissipation depends on the thermal
resistance of the IC package and circuit board, the tem-
perature difference between the die junction and ambient
air, and the rate of airflow. The power dissipated in the
device is P = IOUT x (VIN - VOUT).
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 PCB.
Additionally, the ground pins (GND) perform the dual
function of providing an electrical connection to system
ground and channeling heat away. Connect 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.
Applications Information
Capacitor Selection and
Regulator Stability
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.
The input capacitor (CIN) lowers the source impedance of
the input supply. If input-supply source impedance is high,
place a larger input capacitor close to IN to prevent VIN
sagging due to load transients. Smaller output capacitors
can be used for output currents less than 1A. Calculate
COUT as follows:
OUT OUT(MAX)
C I (1µF / 200mA)= ×
Noise, PSRR, and Transient Response
The MAX8516/MAX8517/MAX8518 are designed to oper-
ate 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.
MAX8516/MAX8517/
MAX8518
1.425V to 3.6V Input, 1A,
0.2V Dropout LDO Regulators
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Chip Information
TRANSISTOR COUNT: 2849
PROCESS: BiCMOS
PACKAGE TYPE PACKAGE CODE DOCUMENT NO.
10 µMAX U10E+3 21-0109
MAX8516/MAX8517/
MAX8518
1.425V to 3.6V Input, 1A,
0.2V Dropout LDO Regulators
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Package Information
For the latest package outline information and land patterns
(footprints), go to www.maximintegrated.com/packages. Note
that a “+”, “#”, or “-” in the package code indicates RoHS status
only. Package drawings may show a different suffix character, but
the drawing pertains to the package regardless of RoHS status.
Chip Information
TRANSISTOR COUNT: 2849
PROCESS: BiCMOS
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 2/04 Initial release —
1 4/04 Removed future product asterisks for MAX8517/MAX8518. Updated
Electrical Characteristics and Pin Description. 1–3, 6
2 9/09 Added MAX8517 automotive package to Ordering Information. 1
3 4/16 Added lead-free designation 1, 9
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. © 2016 Maxim Integrated Products, Inc.
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MAX8516/MAX8517/
MAX8518
1.425V to 3.6V Input, 1A,
0.2V Dropout LDO Regulators
Revision History
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
