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19-0654; Rev 0; 11/06
28V, 100mA, Low-Quiescent-Current LDO with Reset and Power-Fail Input/Output
General Description
The MAX5091 high-voltage linear regulator is designed to operate from a +5V to +28V input voltage, and withstands up to 40V transients. The device consumes only 45A of quiescent current at 100A output current. The MAX5091 delivers up to 100mA of output current with low 50mV maximum dropout voltage. The MAX5091 provides an active-low open-drain microprocessor RESET output. The reset timeout period is programmable and can be set with an external capacitor. The MAX5091 includes an uncommitted comparator for input voltage monitoring/power-fail indication. The device is available with a fixed +5V (MAX5091A) or +3.3V (MAX5091B) output. The MAX5091 is short-circuit protected and includes thermal shutdown. The MAX5091 operates over the -40C to +125C automotive temperature range and is available in 8-pin, thermally enhanced TDFN and SO-EP packages.
Features
+5V to +28V Wide Operating Input Voltage Range Withstands 40V Input Voltage Transients Guaranteed 100mA Output Current 45A Typical Quiescent Current at 100A Output Current Preset +5V (MAX5091A) or +3.3V (MAX5091B) Output Voltage Stable with Only 10F Output Capacitance RESET Output with Adjustable Timeout Period Uncommitted Comparator for Voltage Monitoring/Power-Fail Indication Output Overload and Short-Circuit Protection Thermal Shutdown Available in 8-Pin TDFN (1.95W at TA = +70C) and 8-Pin SO (1.5W at TA = +70C) Operates Over -40C to +125C Automotive Temperature Range
MAX5091
Applications
Automotive Industrial Home Security/Safety Telecom/Networking
Ordering Information
PART MAX5091AATA+T MAX5091AASA+ MAX5091BATA+T MAX5091BASA+ PINPACKAGE 8 TDFN-8 8 SO-EP* 8 TDFN-8 8 SO-EP* PRESET VOUT (V) 5 5 3.3 3.3 PKG CODE T833-2 S8E-14 T833-2 S8E-14 TOP MARK +APB -- +APC --
Note: All devices specified for -40C to +125C operating temperature range. +Denotes lead-free package. *EP = Exposed paddle.
Typical Application Circuit
+5V (MAX5091A)/ +3.3V (MAX5091B) 100mA CIN 10F ON EN OFF SI RL 100k CCT 0.1F CT GND SO RES RSO 10k POWERFAIL C RESET VS VOUT COUT 10F MAX5091 RRES 10k
Pin Configurations
TOP VIEW
VOUT 8 SO 7 RES 6 GND 5
+5V TO +28V VIN
RH 288k
MAX5091
EXPOSED PADDLE
+
1 VS 2 SI 3 EN 4 CT
TDFN (3mm x 3mm) Pin Configurations continued at end of data sheet. ________________________________________________________________ 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.
28V, 100mA, Low-Quiescent-Current LDO with Reset and Power-Fail Input/Output MAX5091
ABSOLUTE MAXIMUM RATINGS
VS to GND ..............................................................-0.3V to +28V VS to GND (t 1s) ..................................................-0.3V to +40V VOUT to GND ..........................................................-0.3V to +20V VS to OUT ...............................................................-0.3V to +28V RES, SO to GND.....................................................-0.3V to +20V RES, SO Output Sink Current................................................5mA VOUT Short Circuit (VS 16V)............ ......................Continuous EN, SI to GND.........................................................-0.3V to +12V CT to GND.............................-0.3V to the lower of VOUT or +12V Continuous Power Dissipation (TA = +70C) 8-Pin SO-EP (derate 19.2mW/C above +70C) .........1538mW* Thermal Resistance (JA)................................................52C/W Thermal Resistance (JC)..................................................6C/W 8-Pin TDFN-EP (derate 24.4mW/C above +70C).....1951mW** Thermal Resistance (JA)................................................41C/W Thermal Resistance (JC)...............................................8.3C/W Operating Junction Temperature Range ...........-40C to +125C Maximum Junction Temperature .....................................+150C Storage Temperature Range .............................-60C to +150C Lead Temperature (soldering, 10s) .................................+300C
*As per JEDEC51 Standard (single-layer board). **As per JEDEC51 Standard (multilayer board).
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 (MAX5091A)
(VS = +14V, VOUT = 5V, EN unconnected, TA = TJ = -40C to +125C, CIN = 10F, COUT = 10F, unless otherwise noted. Typical specifications are at TA = +25C.) (Note 1)
PARAMETER SYMBOL CONDITIONS TA = +25C, IOUT = 1mA 5.6V VS 28V, IOUT = 1mA to 50mA (Note 2) Output Voltage VOUT 5.6V VS 40V, t 1s, IOUT = 1mA to 30mA (Note 2) VS = +8V, IOUT = 1mA to 100mA IOUT = 10mA Dropout Voltage VS to VOUT Difference in Undervoltage Line Regulation Load Regulation Current Limit Quiescent Current VDP VS = +4.75V IOUT = 50mA IOUT = 100mA VIO VOL VOLO ILIM IOUT = 100A IQ IOUT = 300A IOUT = 100mA Shutdown Supply Current Thermal-Shutdown Temperature Thermal-Shutdown Hysteresis ISHDN TJ(SHDN) TJ(SHDN) VEN +0.4V Temperature rising VS = +4V, IOUT = 35mA +5.5V VS +28V, IOUT = 1mA 1mA IOUT 100mA 160 0.6 17 260 46 45 4.5 17 +165 20 MIN 4.95 4.90 4.9 4.9 TYP 5 5 5 5 0.1 0.2 0.3 MAX 5.05 5.10 5.1 5.1 0.25 0.4 0.5 0.4 5 50 400 100 100 10 30 V mV mV mA A mA A C C V V UNITS
2
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28V, 100mA, Low-Quiescent-Current LDO with Reset and Power-Fail Input/Output
ELECTRICAL CHARACTERISTICS (MAX5091A) (continued)
(VS = +14V, VOUT = 5V, EN unconnected, TA = TJ = -40C to +125C, CIN = 10F, COUT = 10F, unless otherwise noted. Typical specifications are at TA = +25C.) (Note 1)
PARAMETER RESET Reset Threshold Voltage Reset Threshold Hysteresis Reset Pulse Delay RES Output Low Voltage RES Output High Leakage Current Delay Comparator Threshold Delay Comparator Threshold Hysteresis SENSE Sense Threshold Sense Threshold Hysteresis Sense Output Low Voltage Sense Output Leakage Current Sense Input Current ENABLE Enable Voltage Enable Internal Pullup Current VEN IEN EN = high, regulator on EN = low, regulator off EN is internally pulled up to 3.6V (max) 2.4 0.4 3 V A VSL ISH ISI VSI 1.10V, VS 4V, RSO = 10k to VOUT VSO = 5V, VSI 1.5V VSI = 3.3V -1 VST VSI falling 1.10 50 1.16 100 1.24 150 0.4 1 +1 V mV V A A VRT VRTH tRD VRL IRH VCTTH CCT = 100nF, tR 100s VS +1.5V,RRES = 10k to VOUT VRES = 5V VCT rising 1.9 2.1 100 VOUT falling 85 30 55 90 65 110 94.5 100 180 0.4 1.0 2.4 %VOUT mV ms V A V mV SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX5091
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3
28V, 100mA, Low-Quiescent-Current LDO with Reset and Power-Fail Input/Output MAX5091
ELECTRICAL CHARACTERISTICS (MAX5091B)
(VS = +14V, VOUT = 3.3V, EN unconnected, TA = TJ = -40C to +125C, CIN = 10F, COUT = 10F, unless otherwise noted. Typical specifications are at TA = +25C.) (Note 1)
PARAMETER SYMBOL CONDITIONS TA = +25C, IOUT = 1mA 5V VS 28V, IOUT = 1mA to 50mA (Note 2) Output Voltage VOUT 5V VS 40V, t < 1s, IOUT = 1mA to 30mA (Note 2) VS = +8V, IOUT = 1mA to 100mA VS to VOUT Difference in Undervoltage Line Regulation Load Regulation Current Limit Quiescent Current Shutdown Supply Current Thermal-Shutdown Temperature Thermal-Shutdown Hysteresis RESET CIRCUIT Reset Threshold Voltage Reset Threshold Hysteresis Reset Pulse Delay RES Output-Low Voltage RES Output-High Leakage Current Delay Comparator Threshold Delay Comparator Threshold Hysteresis VRT VRTH tRD VRL IRH VCTTH CCT = 100nF, tR 100s VS 1.5V, RRES = 4k to VOUT VRES = 3.3V VCT rising 1.9 2.1 100 VOUT falling 85 20 55 90 45 105 94.5 80 180 0.4 1.0 2.4 %VOUT mV ms V A V mV VIO VOL VOLO ILIM IOUT = 100A IQ IOUT = 300A IOUT = 100mA ISHDN TJ(SHDN) TJ(SHDN) VEN 0.4V Temperature rising VS = 3.5V, IOUT = 35mA 5V VS 28V, IOUT = 1mA 1mA IOUT 100mA 160 MIN 3.267 3.234 3.234 3.234 TYP 3.3 3.3 3.3 3.3 0.2 0.6 11 260 45 45 4.4 17 +165 20 MAX 3.333 3.366 3.366 3.366 0.4 5 40 400 100 100 10 30 V mV mV mA A mA A C C V UNITS
4
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28V, 100mA, Low-Quiescent-Current LDO with Reset and Power-Fail Input/Output
ELECTRICAL CHARACTERISTICS (MAX5091B) (continued)
(VS = +14V, VOUT = 3.3V, EN unconnected, TA = TJ = -40C to +125C, CIN = 10F, COUT = 10F, unless otherwise noted. Typical specifications are at TA = +25C.) (Note 1)
PARAMETER SENSE Sense Threshold Sense Threshold Hysteresis Sense Output-Low Voltage Sense Output Leakage Current Sense Input Current ENABLE Enable Voltage Enable Internal Pullup Current VEN IEN EN = high, regulator on EN = low, regulator off EN is internally pulled up to 3.6V (max) 2.4 0.4 3 V A VSL ISH ISI VSI 1.09V, VS 4V, RSO = 10k to VOUT VSO = 3.3V, VSI 1.5V VSI = 3.3V -1 VST VSI falling 1.09 50 1.15 100 1.23 150 0.4 1 +1 V mV V A A SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX5091
Note 1: Limits at TA = -40C are guaranteed by design and not production tested. Note 2: Maximum output current is limited by the power dissipation capability of the package.
Typical Operating Characteristics
(Typical Application Circuit, VS = +14V, CIN = 10F, COUT = 10F, VSI = 0V, VEN = +2.4V, VOUT = +5V, TA = +25C, unless otherwise noted.)
OUTPUT VOLTAGE vs. INPUT VOLTAGE
MAX5091 toc01
OUTPUT VOLTAGE vs. INPUT VOLTAGE
MAX5091 toc02
OUTPUT VOLTAGE vs. OUTPUT CURRENT
5.04 5.02 5.00 MAX5091A
MAX5091 toc03
6 VOUT AT NO LOAD, 100A, 1mA, 10mA, 100mA 5 VOUT (V) MAX5091A
4 VOUT AT NO LOAD, 100A, 1mA, 10mA, 100mA 3 VOUT (V) MAX5091B
VS = 14V
VOUT (V)
4
2
4.98 4.96 VS = 6V
3
1
4.94 4.92
2 0 5 VS (V) 10 15
0 0 1 2 3 VS (V) 4 5 6
4.90 0.01 0.1 1 IOUT (mA) 10 100
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5
28V, 100mA, Low-Quiescent-Current LDO with Reset and Power-Fail Input/Output MAX5091
Typical Operating Characteristics (continued)
(Typical Application Circuit, VS = +14V, CIN = 10F, COUT = 10F, VSI = 0V, VEN = +2.4V, VOUT = +5V, TA = +25C, unless otherwise noted.)
OUTPUT VOLTAGE vs. TEMPERATURE
MAX5091 toc04
QUIESCENT CURRENT vs. INPUT VOLTAGE
MAX5091 toc05
QUIESCENT CURRENT vs. INPUT VOLTAGE
MAX5091 toc06
5.050 MAX5091A 5.025 5.000 VOUT (V) 4.975 IOUT = 10mA 4.950 4.925 4.900 -40 -15 10 35 60 85 110 IOUT = 100mA IOUT = 100A IOUT = 1mA
1000
1000
TA = +25C, +85C 100 IQ (A)
TA = +125C IQ (A)
TA = +125C 100
TA = +25C, +85C
10
TA = -40C
10
TA = -40C
EN = OPEN IOUT = NO LOAD 1 135 TEMPERATURE (C) 2 6 10 14 18 22 VS (V) 26 30 34 38 1 2 6 10 14 18 22 VS (V) 26
EN = OPEN IOUT = 100A 30 34 38
RESET OUTPUT LOW vs. TEMPERATURE
MAX5091 toc07
QUIESCENT CURRENT vs. OUTPUT CURRENT
MAX5091 toc08
SHUTDOWN SUPPLY CURRENT vs. INPUT VOLTAGE
VS = 14V TA = +25C EN = 0V 30
MAX5091 toc09
0.25 RRES = 4k
10
VS = 14V TA = +25C
40
0.20 RESET OUTPUT LOW (V)
1 IQ (mA) 0.15 ISHDN (A) 0.1 10 0.05 0.01 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C) 0.1 1 IOUT (mA) 10 100 20
0.10
RRES = 10k
0
0 0 10 20 VS (V) 30 40
SHUTDOWN SUPPLY CURRENT vs. TEMPERATURE
MAX5091 toc10
DROPOUT VOLTAGE vs. LOAD CURRENT
325 300 275 250 225 200 175 150 125 100 75 50 25 0 0.1 MAX5091A VS = 4.75V 300 275 250 225 200 175 150 125 100 75 50 25 0 0.1
MAX5091 toc11
DROPOUT VOLTAGE vs. LOAD CURRENT
MAX5091B VS = 3.3V
MAX5091 toc12
20 19 18 ISHDN (A) 17 16 15 14 -40 -5 -30 65 100 VS = 14V EN = 0V
DROPOUT VOLTAGE (mV)
DROPOUT VOLTAGE (mV)
135
1 IOUT (mA)
10
100
1 IOUT (mA)
10
100
TEMPERATURE (C)
6
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28V, 100mA, Low-Quiescent-Current LDO with Reset and Power-Fail Input/Output
Typical Operating Characteristics (continued)
(Typical Application Circuit, VS = +14V, CIN = 10F, COUT = 10F, VSI = 0V, VEN = +2.4V, VOUT = +5V, TA = +25C, unless otherwise noted.)
DROPOUT VOLTAGE vs. TEMPERATURE
MAX5091 toc13
MAX5091
RESET THRESHOLD vs. TEMPERATURE
MAX5091 toc14
RESET VOLTAGE vs. OUTPUT VOLTAGE
5 4 MAX5091A RRES = 10k TO OUT
MAX5091 toc15
400 350 DROPOUT VOLTAGE (mV) 300 250 200 150 100 50 0 -40
4.60 4.58 RESET THRESHOLD VOLTAGE (V) 4.56 4.54 VOUT RISING MAX5091A
MAX5091A VS = 4.75V
VRES (V)
4.52 4.50 4.48 4.46 4.44 4.42 4.40
IOUT = 100mA
3 2 1 0 VOUT FALLING
VOUT RISING
VOUT FALLING
IOUT = 10mA -5 30 65 100 135
-40
-5
30
65
100
135
4.3
4.4
4.5 VOUT (V)
4.6
4.7
TEMPERATURE (C)
TEMPERATURE (C)
SENSE THRESHOLD vs. TEMPERATURE
MAX5091 toc16
SENSE OUTPUT vs. SENSE INPUT
MAX5091 toc17
POWER-SUPPLY REJECTION RATIO vs. SUPPLY CURRENT
-10 -20 VIN = 14V IOUT = 10mA 500mVP-P
MAX5091 toc18
1.50 1.45 1.40 SENSE THRESHOLD (V) 1.35 1.30 1.25 1.20 1.15 1.10 1.05 1.00 -40 -5 30 65 100 SI INPUT FALLING SI INPUT RISING
5
0
4 SENSE OUTPUT (V) VSI RISING
PSRR (dB) 1.2 1.3 1.4
3 VSI FALLING
-30 -40 -50 -60 -70
2
1
0 135 1.0 1.1 TEMPERATURE (C) SENSE INPUT (V)
-80 0.01 0.1 1 FREQUENCY (kHz) 10 100
LOAD-TRANSIENT RESPONSE
MAX5091 toc19
LINE-TRANSIENT RESPONSE
MAX5091 toc20
CIN = 10F COUT = 10F/10m ESR ISTEP = 100A TO 50mA
VOUT 5V AC-COUPLED 100mV/div
VOUT 5V AC-COUPLED 200mV/div IOUT = 1mA
50mA IOUT 20mA/div 100A
40V VS 10V/div 14V
200s/div
200s/div
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7
28V, 100mA, Low-Quiescent-Current LDO with Reset and Power-Fail Input/Output MAX5091
Typical Operating Characteristics (continued)
(Typical Application Circuit, VS = +14V, CIN = 10F, COUT = 10F, VSI = 0V, VEN = +2.4V, VOUT = +5V, TA = +25C, unless otherwise noted.)
VOUT STARTUP RESPONSE
MAX5091 toc21
ENABLE RESPONSE
MAX5091 toc22
SHUTDOWN RESPONSE
MAX5091 toc23
IOUT = 100mA IOUT = 10mA VOUT 2V/div 0V VOUT 5V/div
IOUT = 100mA VOUT 2V/div 0V
0V
VS 5V/div 0V 10ms/div 0V 200s/div
EN 5V/div
EN 2V/div 0V
200s/div
Pin Description
PIN 1 2 3 NAME VS SI EN FUNCTION Regulator Input. Operating supply range is from +5V to +28V and withstands 40V transients. Bypass VS to GND with a 10F capacitor. Voltage Sense/Power-Fail Comparator Input. SI is the noninverting input of an uncommitted comparator. SO asserts low if VSI drops below the reference level, VST. Enable Input. Leave unconnected (or pull EN high) to turn on the regulator. Pull EN low to place the device in shutdown mode. EN is internally pulled up to 3.6V. Reset Timeout Delay Capacitor Connection. Connect a capacitor from CT to GND to program the reset timeout period/reset pulse delay. During regulation, CT is pulled up to VOUT. CT is pulled low during reset, when EN is low, or when in thermal shutdown. Ground. Bypass the input and output capacitors to the GND plane. Solder to large pads or the circuit-board ground plane to maximize thermal dissipation. Active-Low Reset Output. Pull up externally to VOUT. Open-drain RES goes low when VOUT is below the reset threshold. Once output voltage is in regulation, RES goes high after the programmed reset timeout period is over. RES is low when EN is low or in thermal shutdown. Voltage Sense/Power-Fail Comparator Output. Pull up externally to VOUT. Open-drain SO asserts low when VSI drops below the reference level, VST. SO also asserts low when EN is low or in thermal shutdown. Regulator Output. Fixed at +5V (MAX5091A) or +3.3V (MAX5091B). Bypass with a 10F ceramic capacitor to GND. Exposed Paddle. EP is internally connected to GND. Connect EP to GND to provide a low thermal-resistance path from the IC junction to the PC board. Do not use as the only electrical connection to GND.
4
CT
5
GND
6
RES
7
SO
8 EP
VOUT EP
8
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28V, 100mA, Low-Quiescent-Current LDO with Reset and Power-Fail Input/Output MAX5091
LDO PASS ELEMENT
VS
VOUT
VINT 3A MAX VREF EN ENABLE ALWAYS-ON PREREGULATOR ALWAYS-ON VINT 3.6V (MAX)
MAX5091
GND VOUT ICT 2A DELAY COMPARATOR N N 2.1V
RES
0.9 x VREF FAULT DETECTION (TEMP AND SC) VREF 1.25V SI N VREF VREF SO SCLIM SD
CT
Figure 1. Functional Diagram
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9
28V, 100mA, Low-Quiescent-Current LDO with Reset and Power-Fail Input/Output MAX5091
Detailed Description
Regulator
The MAX5091 high-voltage, LDO regulator operates from +5V to +28V input voltage. The device withstands up to 40V transients, providing protection against temporary overvoltage conditions like load dump. The MAX5091 incorporates internal feedback resistors for factory-preset voltages of either +5V (MAX5091A) or +3.3V (MAX5091B). The regulator is capable of driving up to 100mA of load current and features a typical current limit of 260mA. The regulator uses a pnp pass element and provides low 0.5V dropout while delivering 100mA load current. The output of the regulator follows closely to the input during turn-on. See the Output Voltage vs. Input Voltage graph in the Typical Operating Characteristics. This makes the usable input voltage range for 3.3V and 5V output down to 3.7V and 5.5V, respectively. The MAX5091 is designed to operate with very low quiescent current during always-on operation when not in dropout. The regulator is stable with a wide variety of capacitors including low-ESR ceramic 10F (0603 case size). The load-transient response curves depict the stability of the LDO when using different capacitance and ESR ranges. See the Capacitor Selection and Regulator Stability section in the Applications Information.
SI/SO Comparator
The MAX5091 includes an uncommitted comparator for monitoring the input voltage or for detecting power-fail conditions. The input SI is the noninverting input of the comparator. The open-drain output SO asserts low when voltage at the input SI drops below the threshold voltage, VST (see Figure 1). The sense comparator typically has a hysteresis of 100mV. Use the following equation to calculate the resistor-divider for programming the trip voltage (VTRIP) during power-fail. See the Typical Application Circuit. VTRIP = (VST x RH ) + VST RL
where VST = 1.16V (typ). Choose RL between 100k to 300k.
Enable Input
The enable (EN) is a TTL-compatible logic input. Logic low at EN turns off the regulator and reduces the current consumption to 17A (typ). It is internally pulled up to a logic-high voltage (3.6V max) by an internal resistor. Thus, the MAX5091 is enabled by default when VS is applied and EN is left unconnected. The regulator, reset supervisor circuit, and the sense comparator can be manually shut down by pulling EN low. For shutdown operation, the pulldown network must be capable of sinking 3A max, since the internal pullup resistor sets the maximum pullup current at 3A. The external pulldown device should not leak more than 1A current when it is in the off-state.
Reset Output (RES)
The MAX5091 integrates a power-on-reset circuit. RES is an open-drain output that requires a pullup resistor to VOUT. The open-drain MOSFET can sink up to 825A current while keeping the RES voltage below 0.4V. The internal reset circuit monitors the regulator output voltage and RES asserts an active-low output when the regulator output falls below a reset threshold of typically 0.9 x VOUT. The RES output remains low when VOUT is below the reset threshold, and remains low for the duration of the reset timeout period (tRD). The reset timeout period is programmable and can be set with an external capacitor connected from CT to ground. The duration of the delay as a function of CT is: tRD = CCT x VCCTH + (35 x 10-6 ) ICT
Current Limit
The MAX5091 features a current limiter that monitors the output current and controls the pass transistor's gate voltage, limiting the output current to typically 260mA. The output can be continuously shorted to ground without damaging the device at VS 16V. Note that the output short-circuit current may increase the power dissipation significantly and raise the junction temperature to its thermal-shutdown threshold. In such a case, the MAX5091 is temporarily turned off.
Thermal Shutdown
When the junction temperature exceeds TJ = +165C (typ), an internal thermal sensor signals the shutdown logic to turn off the pass transistor and allow the IC to cool. The thermal sensor turns the pass transistor on again after the IC's junction temperature cools by +20C (typ), resulting in a cycled output during continuous thermal-overload conditions. Thermal shutdown protects the MAX5091 in the event of fault conditions. For continuous operation, do not exceed the absolute maximum junction temperature of TJ = +150C.
where VCCTH = 2.1V and ICT = 2 x 10-6 A. The default reset timeout period is 35s when no capacitor is connected from CT to ground.
10
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28V, 100mA, Low-Quiescent-Current LDO with Reset and Power-Fail Input/Output
Applications Information
Available Output Current Calculation
The MAX5091 high-voltage regulator provides up to 100mA of output current. The input voltage extends to +28V. Package power dissipation limits the amount of output current available for a given input/output voltage and ambient temperature. Figure 2 depicts the maximum power dissipation curve for the 8-pin SO-EP package. The graph assumes that the exposed metal back of the MAX5091 package is soldered to copper on a single layer PCB according to the JEDEC51 standard. Use Figure 2 to determine the allowable package dissipation for a given ambient temperature. Alternately, use the following formula to calculate the allowable package dissipation:
1.538W For TA + 70C PD = 1.538 - 0.01923 (TA - 70 C) For + 70 C < TA + 125C
After determining the allowable package dissipation, calculate the maximum output current using the following formula: IOUT(MAX) PD VS - VOUT
MAX5091
The above equations do not include the power dissipation from self-heating due to the IC ground current. The junction-to-ambient thermal impedance depends on the area of the copper plane, its thickness, and the number of copper layers on PCB. For the higher power dissipation requirement, use multiple-layered PCBs with 2oz copper and a large copper area.
Capacitor Selection and Regulator Stability
For stable operation over the full temperature range and with load currents up to 100mA, use a 10F output capacitor with a low ESR. Table 1 shows a list of recommended output capacitor ESR for various load conditions.
1.8 1.6 1.4 PD (W) 1.2 1.0 0.8 0.6 0.4 0.2 0 10 20 30 40 1.538W
8-PIN SO-EP
MAX5091 fig02
2.0
Table 1. Recommended Output Capacitor ESR
RECOMMENDED COUT ESR IOUT IOUT 10mA IOUT 50mA IOUT 100mA VOUT = 3.3V CESR < 0.66 CESR < 0.132 CESR < 66m VOUT = 5.0V CESR < 1 CESR < 0.2 CESR < 0.1
DERATE 19.23mW/C
70 90 110 130 150 60 80 100 120 140 TEMPERATURE (C) 50
Figure 2. 8-Pin SO-EP Maximum Power Dissipation vs. Temperature
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11
28V, 100mA, Low-Quiescent-Current LDO with Reset and Power-Fail Input/Output MAX5091
Pin Configurations (continued)
PROCESS: BiCMOS
TOP VIEW
VS SI EN 1 2
Chip Information
+
8 7
VOUT SO RES GND
MAX5091
3 EXPOSED PADDLE 6 5 CT 4
SO-EP
12
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28V, 100mA, Low-Quiescent-Current LDO with Reset and Power-Fail Input/Output
Package Information
(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.)
8L, SOIC EXP. PAD.EPS
PACKAGE OUTLINE 8L SOIC, .150" EXPOSED PAD
MAX5091
21-0111
C
1 1
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13
28V, 100mA, Low-Quiescent-Current LDO with Reset and Power-Fail Input/Output MAX5091
Package Information (continued)
(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, 6,8,10 & 14L, TDFN, EXPOSED PAD, 3x3x0.80 mm
21-0137
H
1 2
14
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6, 8, &10L, DFN THIN.EPS
28V, 100mA, Low-Quiescent-Current LDO with Reset and Power-Fail Input/Output
Package Information (continued)
(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.)
MAX5091
COMMON DIMENSIONS SYMBOL A D E A1 L k A2 MIN. 0.70 2.90 2.90 0.00 0.20 MAX. 0.80 3.10 3.10 0.05 0.40
PACKAGE VARIATIONS PKG. CODE T633-1 T633-2 T833-1 T833-2 T833-3 T1033-1 T1033-2 T1433-1 T1433-2 N 6 6 8 8 8 10 10 14 14 D2 1.500.10 1.500.10 1.500.10 1.500.10 1.500.10 1.500.10 1.500.10 1.700.10 1.700.10 E2 2.300.10 2.300.10 2.300.10 2.300.10 2.300.10 2.300.10 2.300.10 2.300.10 2.300.10 e 0.95 BSC 0.95 BSC 0.65 BSC 0.65 BSC 0.65 BSC 0.50 BSC 0.50 BSC 0.40 BSC 0.40 BSC JEDEC SPEC MO229 / WEEA MO229 / WEEA MO229 / WEEC MO229 / WEEC MO229 / WEEC MO229 / WEED-3 MO229 / WEED-3 ------b 0.400.05 0.400.05 0.300.05 0.300.05 0.300.05 0.250.05 0.250.05 0.200.05 0.200.05 [(N/2)-1] x e 1.90 REF 1.90 REF 1.95 REF 1.95 REF 1.95 REF 2.00 REF 2.00 REF 2.40 REF 2.40 REF
0.25 MIN. 0.20 REF.
PACKAGE OUTLINE, 6,8,10 & 14L, TDFN, EXPOSED PAD, 3x3x0.80 mm
-DRAWING NOT TO SCALE-
21-0137
H
2 2
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 15 (c) 2006 Maxim Integrated Products
Heaney
is a registered trademark of Maxim Integrated Products, Inc.

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