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19-3188; Rev 2; 9/09
KIT ATION EVALU ILABLE AVA
1
0MAX
m
1.425V to 3.6V Input, 1A, 0.2V Dropout LDO Regulators
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 (0C to +85C), 0.6% Initial Accuracy Compatible with Ceramic Capacitors Fast Transient Response 320A Operating Supply Current <25A 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 0C to +85C. These regulators use small, 1F ceramic input capacitors and 4.7F 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 4.7F 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 340A (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 MAX(R) package that includes an exposed pad for optimal power dissipation.
MAX is a registered trademark of Maxim Integrated Products, Inc.
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
3m
m x 5m
General Description
MAX8516/MAX8517/MAX8518
Ordering Information
PART MAX8516EUB MAX8517EUB MAX8517EUB/V MAX8518EUB TEMP RANGE -40C to +85C -40C to +85C -40C to +85C -40C to +85C PIN-PACKAGE 10 MAX 10 MAX 10 MAX 10 MAX
/V Denotes an automotive qualified part.
Typical Operating Circuit
INPUT 1.425V TO 3.6V IN_ OUT_ 1F OUTPUT 0.5V TO (VIN - 0.2V), 1A
Applications
Servers Storage Networking Base Stations Optical Modules
OFF
Post Regulators Notebooks PDAs ATE
ON EN POWER-ON RESET POWER-OK
MAX8516 MAX8517 MAX8518
POR (MAX8518) FB POK (MAX8517) GND
4.7F
Pin Configurations
TOP VIEW
EN 1 IN IN N.C. N.C. 2 3 4 5 10 N.C. 9 OUT OUT FB GND EN 1 IN IN POK N.C. 2 3 4 5 10 N.C. 9 OUT OUT FB GND EN 1 IN IN N.C. POR 2 3 4 5 10 N.C. 9 OUT OUT FB GND
MAX8516
8 7 6
MAX8517
8 7 6
MAX8518
8 7 6
MAX
MAX
MAX
________________________________________________________________ Maxim Integrated Products
1
1.425V to 3.6V Input, 1A, 0.2V Dropout LDO Regulators MAX8516/MAX8517/MAX8518
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 = +70C, EP soldered to PCB) 10-Pin MAX (derate 10.3mW/C above +70C) .........824mW Operating Temperature Range ...........................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C Soldering Temperature (reflow) .......................................+240C
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 = -40C to +85C, unless otherwise noted.) (Note 1)
PARAMETER IN Input Voltage Range Input Undervoltage Lockout OUT Output Voltage Range Load Regulation Line Regulation Dropout Voltage (VIN - VOUT) Current Limit Output Shutdown Leakage FB IOUT = 10mA, TA = +85C FB Threshold Accuracy FB Input Bias Current GND GND Supply Current GND Shutdown Current POK (MAX8517 ONLY) POK Threshold POK Output Voltage Low POK Output Current High POK Fault Delay Time VFB moving out of regulation, VHYS = 10mV, IN = 1.425V to 3.6V VFB = 0.4V or 0.6V, IPOK = 1mA VPOK = 3.6V From FB to POK 25 FB high FB low 540 440 550 450 25 0.001 50 560 460 200 1 100 mV mV A s VIN = 3.6V, VOUT = 3V, IOUT = 100mA Dropout, VIN = 3.6V, VFB = 480mV VIN = 3.6V, EN = GND 320 340 0.25 600 25 A A VOUT = 1.225V to 3V, VIN = VOUT + 0.2V to 3.6V, IOUT = 1mA to 1A VFB = 0.5V, VIN = 3.6V 497 493 0.001 500 503 507 1 mV A IOUT = 1mA to 1A VIN = 1.425V to 3.6V, VOUT = 1.225V, IOUT = 1mA VIN = 1.425V, IOUT = 1A, VFB = 480mV VIN = 3.6V, VOUT = 3V, VFB = 480mV VIN = 3.6V, VOUT = 0V, VEN = 0V 1.6 -0.15 0.5 0.1 0 100 2 0.25 +0.15 200 2.4 25 3.4 V %/A % /V mV A A VIN rising, 70mV hysteresis 1.425 1.32 1.35 3.600 1.38 V V CONDITIONS MIN TYP MAX UNITS
2
_______________________________________________________________________________________
1.425V to 3.6V Input, 1A, 0.2V Dropout LDO Regulators
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1. VIN = +1.8V, VOUT = +1.5V, EN = IN, IOUT = 1mA, TA = -40C to +85C, unless otherwise noted.) (Note 1)
PARAMETER POR (MAX8518 ONLY) POR Reset Threshold POR Output Voltage Low POR Output Current High POR Rising Delay Time EN Enable Input Threshold Enable Input Bias Current THERMAL SHUTDOWN Thermal-Shutdown Threshold OUTPUT TRANSIENT Load Transient Line Transient IOUT = 20mA to 1A to 20mA, tRISE = tFALL = 1s VIN = 0.5V, tRISE = tFALL = 5s 3 3 % % Output on or off TJ rising TJ falling +165 +150 C VIN = 1.425V to 3.6V VEN = 0 or 3.6V EN rising EN falling 0.4 -1 +1 1.2 V A VFB falling, VHYS = 10mV, VIN = 1.425V to 3.6V VFB = 0.4V or 0.6V, IPOR = 1mA VPOR = 3.6V From FB to POR 105 440 450 25 0.001 150 460 200 1 210 mV mV A ms CONDITIONS MIN TYP MAX UNITS
MAX8516/MAX8517/MAX8518
Note 1: Specifications to TA = -40C 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 = 4.7F, CIN = 1F, TA = +25C.)
OUTPUT VOLTAGE vs. INPUT VOLTAGE
TA = -40C TO +85C 1.55 OUTPUT VOLTAGE (V) 1.50 1.45 1.40 1.35 1.30 0 0.6 1.2 1.8 2.4 3.0 3.6 INPUT VOLTAGE (V)
MAX8516/17/18 toc01
OUTPUT VOLTAGE vs. LOAD CURRENT
MAX8516/17/18 toc02
GROUND CURRENT vs. INPUT VOLTAGE
MAX8516/17/18 toc03
1.60
1.502 1.500 OUTPUT VOLTAGE (V) 1.498 1.496 1.494 1.492 1.490 0 200 400 600 800 1000 TA = +25C TA = -40C TA = +85C
500 ILOAD = 1A
400 GROUND CURRENT (A)
300 ILOAD = 0.5A 200 ILOAD = 0A 100
0 1200 0 0.6 1.2 1.8 2.4 3.0 3.6 LOAD CURRENT (mA) INPUT VOLTAGE (V)
_______________________________________________________________________________________
3
1.425V to 3.6V Input, 1A, 0.2V Dropout LDO Regulators MAX8516/MAX8517/MAX8518
Typical Operating Characteristics (continued)
(Circuit of Figure 1, VIN = +1.8V, VOUT = +1.5V, IOUT = 1A, COUT = 4.7F, CIN = 1F, TA = +25C.)
GROUND CURRENT vs. LOAD CURRENT
MAX8516/17/18 toc04
DROPOUT VOLTAGE vs. LOAD CURRENT
MAX8516/17/18 toc05
375 TA = +85C 350 GROUND CURRENT (A)
125
325 TA = +25C TA = -40C 300
DROPOUT VOLTAGE (mV)
100
75
50
275
25
250 0 200 400 600 800 1000 1200 LOAD CURRENT (mA)
0 0 200 400 600 800 1000 LOAD CURRENT (mA)
LINE INPUT TRANSIENT (VIN = +1.8V TO +2.5V, ILOAD = 1A)
MAX8516/17/18 toc06
LOAD-TRANSIENT RESPONSE (ILOAD = 0.1A TO 1A)
MAX8516/17/18 toc07
VOUT AC-COUPLED 20mV/div
VOUT AC-COUPLED 50mV/div
VIN AC-COUPLED 0.5V/div CIN = 220F ELECTROLYTIC CAP CLOSE TO IN 100s/div 40s/div
ILOAD 1A/div
SHUTDOWN RESPONSE
MAX8516/17/18 toc08
PSRR vs. FREQUENCY (MAX8516)
70 60 PSRR (dB) VOUT 1V/div IIN 1A/div 50 40 30 20 10 EN 2V/div 0 ILOAD = 100mA 0.01 0.1 1 10 100 1000
MAX8516/17/18 toc09
80
100s/div
FREQUENCY (kHz)
4
_______________________________________________________________________________________
1.425V to 3.6V Input, 1A, 0.2V Dropout LDO Regulators
Typical Operating Characteristics (continued)
(Circuit of Figure 1, VIN = +1.8V, VOUT = +1.5V, IOUT = 1A, COUT = 4.7F, CIN = 1F, TA = +25C.)
MAX8516/MAX8517/MAX8518
FB VOLTAGE vs. TEMPERATURE
MAX8516/17/18 toc10
OUTPUT RIPPLE VOLTAGE
MAX8516/17/18 toc11
502
501 FB VOLTAGE (mV)
500
VOUT AC-COUPLED 1mV/div
499 ILOAD = 10mA 498 -40 -15 10 35 60 85 100s/div TEMPERATURE (C)
OVERCURRENT THRESHOLD vs. TEMPERATURE
MAX8516/17/18 toc12
SHORT-CIRCUIT CURRENT
MAX8516/17/18 toc13
1.95 OVERCURRENT THRESHOLD (A)
1.90
VOUT 1V/div
1.85
1.80
IOUT 2A/div
1.75 -40 -15 10 35 60 85 100s/div TEMPERATURE (C)
CASE TEMPERATURE vs. LOAD CURRENT
VIN = 2.5V; TA = +25C
MAX8516/17/18 toc14
75
CASE TEMPERATURE (C)
60
45
30
15
0 0 200 400 600 800 1000 LOAD CURRENT (mA)
_______________________________________________________________________________________
5
1.425V to 3.6V Input, 1A, 0.2V Dropout LDO Regulators MAX8516/MAX8517/MAX8518
Pin Description
PIN MAX8516 1 2, 3 4, 5, 10 6 7 8, 9 MAX8517 1 2, 3 5, 10 6 7 8, 9 MAX8518 1 2, 3 4, 10 6 7 8, 9 NAME EN IN N.C. GND FB OUT FUNCTION Enable Input. Set low to place the device in low-current shutdown mode. Set high for normal operation. Regulator Input. VIN can range from +1.425V to +3.6V. Bypass with a 1F or higher ceramic capacitor to GND. No Connection. Pin 10 is internally pulled down to GND with a 10k resistor. Leave unconnected. Ground Feedback Pin. Connect to output through a voltage-divider to set the output. Regulator Output. Bypass with a 4.7F ceramic capacitor to GND (a smaller capacitor can be used if maximum load is less than 1A, i.e., COUT = IOUT (max) x (1F/200mA). 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). Exposed Pad on the Underside of the Package. Solder to the ground plane for proper heat dissipation.
--
4
--
POK
--
--
5
POR
--
--
--
EP
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
Detailed Description
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.
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 5k to optimize quiescent current, accuracy, and high-frequency power-supply rejection. To simplify resistor selection: V R1 = R2 OUT VFB
-
MAX8516/MAX8517/MAX8518
Internal p-Channel Pass Transistor
The MAX8516/MAX8517/MAX8518 feature a 100m (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 340A (typ) of quiescent current under heavy loads, as well as in dropout.
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: (F) C IINRUSH = ILOAD + OUT 66
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 +165C, the thermal-overload circuitry turns off the output, allowing the part to cool down. When the junction temperature cools to +150C, 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 = +150C.
ADJUSTABLE OUTPUT IN 1F IN OUT
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 10k 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 50s (typ) after the trip threshold is initially reached. If the part is in shutdown mode, POK is low.
+1.425V TO +3.6V
MAX8516 MAX8517 MAX8518
OUT R1 FB
100k* POK (MAX8517) OR POR (MAX8518) ENABLE EN SHUTDOWN *FOR MAX8517 AND MAX8518 GND
4.7F
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.
R2
Figure 1. Typical Application Circuit
_______________________________________________________________________________________ 7
1.425V to 3.6V Input, 1A, 0.2V Dropout LDO Regulators MAX8516/MAX8517/MAX8518
Operating Region and Power Dissipation
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. 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.
Noise, PSRR, and Transient Response
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 4.7F up to 50F to attenuate the overshoot.
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 1F capacitor between IN and ground and a 4.7F 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) x (1F 200mA)
8
_______________________________________________________________________________________
1.425V to 3.6V Input, 1A, 0.2V Dropout LDO Regulators
Chip Information
TRANSISTOR COUNT: 2849 PROCESS: BiCMOS
Package Information
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 10 MAX PACKAGE CODE U10E-3 DOCUMENT NO. 21-0109
MAX8516/MAX8517/MAX8518
_______________________________________________________________________________________
9
1.425V to 3.6V Input, 1A, 0.2V Dropout LDO Regulators MAX8516/MAX8517/MAX8518
Revision History
REVISION NUMBER 0 1 2 REVISION DATE 2/04 4/04 9/09 Initial release Removed future product asterisks for MAX8517/MAX8518. Updated Electrical Characteristics and Pin Description. Added MAX8517 automotive package to Ordering Information. DESCRIPTION PAGES CHANGED -- 1-3, 6 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.
10 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2009 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.

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