MAXIM MAX8516EUB

19-3188; Rev 2; 9/09
0µMAX
3m
m
1
KIT
ATION
EVALU
E
L
B
A
IL
AVA
1.425V to 3.6V Input, 1A,
0.2V Dropout LDO Regulators
m x 5m
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
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.
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
output 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 output 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.
Ordering Information
PART
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 dissipation.
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.
Typical Operating Circuit
INPUT
1.425V TO 3.6V
IN_
Post Regulators
Storage
Notebooks
Networking
PDAs
Base Stations
ATE
OUTPUT
0.5V TO (VIN - 0.2V), 1A
1µF
Applications
Servers
OUT_
MAX8516
MAX8517
MAX8518
POWER-ON RESET
4.7µF
POR (MAX8518)
FB
POWER-OK
POK (MAX8517)
ON
Optical Modules
EN
GND
OFF
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Pin Configurations
TOP VIEW
EN 1
10 N.C.
EN 1
9
OUT
IN
2
8
OUT
IN
3
10 N.C.
EN 1
9
OUT
IN
2
8
OUT
IN
3
10 N.C.
IN
2
IN
3
N.C.
4
7
FB
POK
4
7
FB
N.C.
4
7
FB
N.C.
5
6
GND
N.C.
5
6
GND
POR
5
6
GND
MAX8516
µMAX
MAX8517
µMAX
MAX8518
9
OUT
8
OUT
µMAX
________________________________________________________________ Maxim Integrated Products
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
1
MAX8516/MAX8517/MAX8518
General Description
MAX8516/MAX8517/MAX8518
1.425V to 3.6V Input, 1A,
0.2V Dropout LDO Regulators
ABSOLUTE MAXIMUM RATINGS
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 PCB)
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 (reflow) .......................................+240°C
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)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
3.600
V
1.38
V
3.4
V
0
+0.15
% /V
100
200
mV
IN
Input Voltage Range
Input Undervoltage Lockout
1.425
VIN rising, 70mV hysteresis
1.32
1.35
OUT
Output Voltage Range
0.5
Load Regulation
IOUT = 1mA to 1A
Line Regulation
VIN = 1.425V to 3.6V, VOUT = 1.225V, IOUT = 1mA
0.1
Dropout Voltage (VIN - VOUT)
VIN = 1.425V, IOUT = 1A, VFB = 480mV
Current Limit
VIN = 3.6V, VOUT = 3V, VFB = 480mV
Output Shutdown Leakage
VIN = 3.6V, VOUT = 0V, VEN = 0V
-0.15
1.6
%/A
2
2.4
A
0.25
25
µA
500
503
FB
IOUT = 10mA, TA = +85°C
497
FB Threshold Accuracy
VOUT = 1.225V to 3V, VIN = VOUT + 0.2V to 3.6V,
IOUT = 1mA to 1A
493
FB Input Bias Current
VFB = 0.5V, VIN = 3.6V
507
0.001
1
mV
µA
GND
GND Supply Current
GND Shutdown Current
VIN = 3.6V, VOUT = 3V, IOUT = 100mA
320
Dropout, VIN = 3.6V, VFB = 480mV
340
600
VIN = 3.6V, EN = GND
0.25
25
µA
µA
POK (MAX8517 ONLY)
POK Threshold
VFB moving out of regulation,
VHYS = 10mV, IN = 1.425V to 3.6V
POK Output Voltage Low
VFB = 0.4V or 0.6V, IPOK = 1mA
POK Output Current High
VPOK = 3.6V
POK Fault Delay Time
From FB to POK
2
FB high
540
550
560
FB low
440
450
460
25
200
mV
0.001
1
µA
50
100
µs
25
_______________________________________________________________________________________
mV
1.425V to 3.6V Input, 1A,
0.2V Dropout LDO Regulators
(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
440
450
460
mV
mV
POR (MAX8518 ONLY)
POR Reset Threshold
VFB falling, VHYS = 10mV, VIN = 1.425V to 3.6V
POR Output Voltage Low
VFB = 0.4V or 0.6V, IPOR = 1mA
POR Output Current High
VPOR = 3.6V
POR Rising Delay Time
From FB to POR
105
25
200
0.001
1
µA
150
210
ms
EN
Enable Input Threshold
VIN = 1.425V to 3.6V
Enable Input Bias Current
VEN = 0 or 3.6V
EN rising
1.2
EN falling
V
0.4
-1
+1
µA
THERMAL SHUTDOWN
Thermal-Shutdown Threshold
Output on or off
TJ rising
+165
TJ falling
+150
°C
OUTPUT TRANSIENT
Load Transient
IOUT = 20mA to 1A to 20mA, tRISE = tFALL = 1µs
3
%
Line Transient
δVIN = 0.5V, tRISE = tFALL = 5µs
3
%
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.
Typical Operating Characteristics
(Circuit of Figure 1, VIN = +1.8V, VOUT = +1.5V, IOUT = 1A, COUT = 4.7µF, CIN = 1µF, TA = +25°C.)
1.45
1.40
1.498
TA = +25°C
1.496
TA = -40°C
1.494
1.490
1.30
0
0.6
1.2
1.8
2.4
INPUT VOLTAGE (V)
3.0
3.6
ILOAD = 1A
400
300
ILOAD = 0.5A
200
ILOAD = 0A
100
1.492
1.35
MAX8516/17/18 toc03
TA = +85°C
1.500
500
GROUND CURRENT (µA)
1.50
MAX8516/17/18 toc02
1.55
1.502
OUTPUT VOLTAGE (V)
TA = -40°C TO +85°C
MAX8516/17/18 toc01
1.60
OUTPUT VOLTAGE (V)
GROUND CURRENT
vs. INPUT VOLTAGE
OUTPUT VOLTAGE
vs. LOAD CURRENT
OUTPUT VOLTAGE
vs. INPUT VOLTAGE
0
0
200
400
600
800
LOAD CURRENT (mA)
1000
1200
0
0.6
1.2
1.8
2.4
3.0
3.6
INPUT VOLTAGE (V)
_______________________________________________________________________________________
3
MAX8516/MAX8517/MAX8518
ELECTRICAL CHARACTERISTICS (continued)
Typical Operating Characteristics (continued)
(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
GROUND CURRENT
vs. LOAD CURRENT
350
325
TA = +25°C
TA = -40°C
300
125
275
MAX8516/17/18 toc05
TA = +85°C
DROPOUT VOLTAGE (mV)
MAX8516/17/18 toc04
375
GROUND CURRENT (µA)
100
75
50
25
250
0
0
200
400
600
800
1000
1200
200
0
400
600
800
LOAD CURRENT (mA)
LOAD CURRENT (mA)
LINE INPUT TRANSIENT
(VIN = +1.8V TO +2.5V, ILOAD = 1A)
LOAD-TRANSIENT RESPONSE
(ILOAD = 0.1A TO 1A)
MAX8516/17/18 toc06
1000
MAX8516/17/18 toc07
VOUT
AC-COUPLED
20mV/div
VOUT
AC-COUPLED
50mV/div
VIN
AC-COUPLED
0.5V/div
ILOAD
1A/div
CIN = 220µF ELECTROLYTIC
CAP CLOSE TO IN
100µs/div
40µs/div
PSRR vs. FREQUENCY (MAX8516)
SHUTDOWN RESPONSE
MAX8516/17/18 toc08
MAX8516/17/18 toc09
80
70
60
VOUT
1V/div
IIN
1A/div
50
PSRR (dB)
MAX8516/MAX8517/MAX8518
1.425V to 3.6V Input, 1A,
0.2V Dropout LDO Regulators
40
30
20
10
EN
2V/div
100µs/div
0
ILOAD = 100mA
0.01
0.1
1
10
100
FREQUENCY (kHz)
4
_______________________________________________________________________________________
1000
1.425V to 3.6V Input, 1A,
0.2V Dropout LDO Regulators
FB VOLTAGE vs. TEMPERATURE
OUTPUT RIPPLE VOLTAGE
MAX8516/17/18 toc11
MAX8516/17/18 toc10
502
FB VOLTAGE (mV)
501
VOUT
AC-COUPLED
1mV/div
500
499
ILOAD = 10mA
498
-40
-15
10
35
60
85
100µs/div
TEMPERATURE (°C)
OVERCURRENT THRESHOLD
vs. TEMPERATURE
SHORT-CIRCUIT CURRENT
MAX8516/17/18 toc13
MAX8516/17/18 toc12
1.90
VOUT
1V/div
1.85
IOUT
2A/div
1.80
1.75
-40
-15
10
35
60
100µs/div
85
TEMPERATURE (°C)
75
MAX8516/17/18 toc14
CASE TEMPERATURE
vs. LOAD CURRENT
CASE TEMPERATURE (°C)
OVERCURRENT THRESHOLD (A)
1.95
VIN = 2.5V; TA = +25°C
60
45
30
15
0
0
200
400
600
800
1000
LOAD CURRENT (mA)
_______________________________________________________________________________________
5
MAX8516/MAX8517/MAX8518
Typical Operating Characteristics (continued)
(Circuit of Figure 1, VIN = +1.8V, VOUT = +1.5V, IOUT = 1A, COUT = 4.7µF, CIN = 1µF, TA = +25°C.)
1.425V to 3.6V Input, 1A,
0.2V Dropout LDO Regulators
MAX8516/MAX8517/MAX8518
Pin Description
PIN
NAME
FUNCTION
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 unconnected.
6
6
6
GND
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
Exposed Pad on the Underside of the Package. Solder to the ground plane for
proper heat dissipation.
Ground
Functional Diagram
IN
THRESHOLD
OVERTHERMAL
PROTECTION
REF
EN
OVERTHERMAL
PROTECTION
0.50V
0.55V
0.45V
UNDERVOLTAGE
LOCKOUT
ERROR AMP
WITH
SOFT-START
MOS DRIVER
WITH ILIMIT
OUT
FB
MAX8516
MAX8517
MAX8518
POK
(MAX8517 ONLY)
POR
(MAX8518 ONLY)
GND
6
_______________________________________________________________________________________
1.425V to 3.6V Input, 1A,
0.2V Dropout LDO Regulators
The MAX8516/MAX8517/MAX8518 are low-input, lowdropout, 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 significant 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 limited 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 continue until the fault is removed. For
continuous operation, do not exceed the absolute maximum junction-temperature rating of TJ = +150°C.
ADJUSTABLE
OUTPUT
+1.425V TO +3.6V
IN
OUT
1µF
IN
MAX8516
MAX8517
MAX8518
OUT
R1
100kΩ*
FB
POK (MAX8517) OR
POR (MAX8518)
R2
ENABLE
EN
SHUTDOWN
*FOR MAX8517 AND MAX8518
GND
4.7µF
Output Voltage Selection
The MAX8516/MAX8517/MAX8518 feature an
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:
R1 ⎞
⎛
VOUT = VFB ⎜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:
⎛V
R1 = R2 ⎜ OUT
⎝ VFB
−
⎞
1⎟
⎠
Soft-Start
Inherent soft-start limits inrush current. Peak inrush current is dependent on the value of COUT and can be calculated as follows:
(µF) ⎞
⎛C
IINRUSH = ILOAD + ⎜ OUT
⎟
⎝
⎠
66
Shutdown Mode
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 shutdown, an internal 10kΩ resistor pulls down the output.
Power-OK (MAX8517 Only)
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 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
_______________________________________________________________________________________
7
MAX8516/MAX8517/MAX8518
Detailed Description
MAX8516/MAX8517/MAX8518
1.425V to 3.6V Input, 1A,
0.2V Dropout LDO Regulators
Operating Region and Power Dissipation
Noise, PSRR, and Transient Response
The maximum power dissipation depends on the thermal 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 dissipated in the device is P = IOUT ✕ (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.
The MAX8516/MAX8517/MAX8518 are designed 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.
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:
COUT = IOUT(MAX) × (1µF 200mA)
8
_______________________________________________________________________________________
1.425V to 3.6V Input, 1A,
0.2V Dropout LDO Regulators
TRANSISTOR COUNT: 2849
PROCESS: BiCMOS
For the latest package outline information and land patterns, go
to www.maxim-ic.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.
PACKAGE TYPE
PACKAGE CODE
DOCUMENT NO.
10 µMAX
U10E-3
21-0109
_______________________________________________________________________________________
9
MAX8516/MAX8517/MAX8518
Package Information
Chip Information
MAX8516/MAX8517/MAX8518
1.425V to 3.6V Input, 1A,
0.2V Dropout LDO Regulators
Revision History
REVISION
NUMBER
REVISION
DATE
0
2/04
Initial release
1
4/04
Removed future product asterisks for MAX8517/MAX8518. Updated
Electrical Characteristics and Pin Description.
2
9/09
Added MAX8517 automotive package to Ordering Information.
DESCRIPTION
PAGES
CHANGED
—
1–3, 6
1
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implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
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