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19-4816; Rev 0; 7/09
200mA, Automotive, Ultra-Low Quiescent Current, Linear Regulator
General Description
The MAX16910 ultra-low quiescent current, high-voltage linear regulator is ideal for use in automotive and batteryoperated systems. The device operates from a +3.5V to +30V input voltage, delivers up to 200mA of load current, and consumes only 20A of quiescent current at no load. The device consumes only 1.6A current when in shutdown. The input is +45V transient tolerant and is designed to operate under load-dump conditions. The MAX16910 can be configured as either fixed output voltage (+3.3V or +5V) or adjustable output voltage using an external resistive divider. The MAX16910 features an open-drain, active-low RESET output with fixed thresholds offered at 92.5% and 87.5% of the output voltage. The RESET output remains low for a fixed period of 60s after the output voltage exceeds its threshold. The RESET delay can be extended with an external capacitor. The MAX16910 includes an enable input, short-circuit protection, and thermal shutdown. The MAX16910 operates over the -40C to +125C automotive temperature range. The device is available in a space-saving, thermally enhanced, 3mm x 3mm, 8-pin TDFN package and 5mm x 4mm, 8-pin SO package.
S Low 20A Quiescent Current S +3.5V to +30V Wide Input Voltage Range, +45V
Features
Tolerant
S Operates Through Cold-Crank Conditions S Low-Dropout Voltage of 280mV at 200mA S Up to 200mA Output Current Capability S Stable Operation with Tiny 4.7F Output Capacitor S User-Selectable Output Voltage
MAX16910
+3.3V or +5V Fixed +1.5V to +11V Adjustable with External Resistive Divider
S Open-Drain RESET Output with Adjustable Delay S Fixed-Reset Threshold Options: 87.5% or 92.5% S High-Voltage Enable Input (+45V) S Thermal and Short-Circuit Protection S Operating -40C to +125C Temperature Range S Automotive Qualified
Applications
Automotive Industrial Telecom
PART MAX16910CATA_/V+ MAX16910CASA_/V+
Ordering Information
IOUT
(mA)
TEMP RANGE -40NC to +125NC -40NC to +125NC
PINPACKAGE 8 TDFN-EP* (3mm x 3mm) 8 SO-EP* (5mm x 4mm)
200 200
Typical Operating Circuits
5V FIXED OUTPUT IN 1F ENABLE + 14V BATTERY OUT SETOV 4.7F 10kI VCC C I/O RESET
Insert the desired suffix numbers (from the Selector Guide) into the blank "_" to indicate reset threshold. +Denotes a lead(Pb)-free/RoHS-compliant package. /V Denotes an automotive qualified part. *EP = Exposed pad.
MAX16910 SET GND RESET TIMEOUT 1nF (1.25ms DELAY)
Typical Operating Circuits continued on next page.
_______________________________________________________________ Maxim Integrated Products 1
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.
200mA, Automotive, Ultra-Low Quiescent Current, Linear Regulator MAX16910
Typical Operating Circuits (continued)
3.3V FIXED OUTPUT IN 1F ENABLE + 14V BATTERY MAX16910 SETOV SET GND TIMEOUT 1nF (1.25ms DELAY) RESET 4.7F 10kI OUT VCC C I/O RESET
ADJUSTABLE OUTPUT IN 1F ENABLE + 14V BATTERY SET GND TIMEOUT MAX16910 SETOV R2 4.7F 10kI OUT R1 VCC C I/O RESET RESET
1nF (1.25ms DELAY)
2
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200mA, Automotive, Ultra-Low Quiescent Current, Linear Regulator
Pin Configurations
MAX16910
TIMEOUT
TOP VIEW
SETOV GND OUT
TOP VIEW
8
7
6
5 IN ENABLE 1 2 3
+ MAX16910
*EP
8 7 6 5
OUT GND SETOV TIMEOUT
MAX16910 +
1 IN 2 ENABLE 3 SET *EP 4 RESET
SET
RESET 4
SO
*CONNECT EXPOSED PAD TO GND.
TDFN
*CONNECT EXPOSED PAD TO GND.
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3
200mA, Automotive, Ultra-Low Quiescent Current, Linear Regulator MAX16910
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND.) IN, ENABLE, SET.................................................. -0.3V to +45V OUT, RESET (open-drain output)............................-0.3V to +12V SETOV, TIMEOUT....................................................-0.3V to +6V Maximum Current (all pins except IN and OUT)...............50mA Continuous Power Dissipation (TA = +70C) 8-Pin TDFN (derate 24.4mW/C above +70C)*.............1951mW 8-Pin SO (derate 23.3mW/C above +70C)*................1861mW Junction-to-Case Thermal Resistance (JC) (Note 1) 8-Pin TDFN.......................................................................8C/W 8-Pin SO...........................................................................7C/W Junction-to-Ambient Thermal Resistance (JA) (Note 1) 8-Pin TDFN.....................................................................41C/W 8-Pin SO.........................................................................43C/W Operating Temperature Range..........................-40C to +125C Junction Temperature......................................................+150C Storage Temperature Range..............................-65C to +150C Lead Temperature (soldering, 10s).................................+300C
*As per JEDEC51 Standard (multilayer board). Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.
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
(VIN = VENABLE = +14V, CTIMEOUT = open, CIN = 1F, COUT = 4.7F, unless otherwise noted. TA = TJ = -40C to +125C, unless otherwise noted. Typical values are TA = +25C.) (Note 2) PARAMETER Supply Voltage Range Supply Current Shutdown Supply Current Output Voltage (5V Fixed Output Setting) Output Voltage (3.3V Fixed Output Setting) Adjustable Output-Voltage Range SETOV FB Voltage Dropout Voltage (Note 4) Short-Circuit Output Current Limit Thermal Shutdown ISHDN VOUT50 VOUT33 VOUT VSETOV DVDO ISC ILOAD = 1mA ILOAD = 200mA, SET = GND, SETOV = HIGH, VOUT(NORM) = +5.0V Output shorted to GND (MAX16910C__) (Note 5) 230 SYMBOL VIN Continuous For P 400ms ILOAD = 0, SET = GND, VOUT = 5V ENABLE = GND, TA = +25NC ENABLE = GND, -40NC P TA P +125NC 1mA P ILOAD P 200mA, VIN = 6V to 30V (Note 3) 1mA P ILOAD P 200mA, VIN = 4.8V to 30V (Note 3) 4.9 3.234 1.5 1.225 1.25 280 330 +180 20 1.6 3 5.0 3.3 5.1 3.366 11.0 1.275 600 CONDITIONS MIN 3.5 TYP MAX 30 45 30 3 UNITS V FA FA V V V V mV mA NC
4
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200mA, Automotive, Ultra-Low Quiescent Current, Linear Regulator
ELECTRICAL CHARACTERISTICS (continued)
(VIN = VENABLE = +14V, CTIMEOUT = open, CIN = 1F, COUT = 4.7F, unless otherwise noted. TA = TJ = -40C to +125C, unless otherwise noted. Typical values are TA = +25C.) (Note 2) PARAMETER Thermal Shutdown Hysteresis Line Regulation (5V Fixed Output Setting) Line Regulation (3.3V Fixed Output Setting) Load Regulation (5V Fixed Output Setting) Load Regulation (3.3V Fixed Output Setting) Power-Supply Rejection Ratio Startup Response Time TIMEOUT INPUT TIMEOUT Ramp Current TIMEOUT Ramp Delay RESET Default Timeout Period RESET OUTPUT RESET Threshold RESET Threshold Hysteresis OUT to RESET Delay RESET Output-Voltage Low (Open-Drain) RESET Open-Drain Leakage Current RESET Open-Drain Leakage Current ENABLE ENABLE Logic-Low ENABLE Logic-High ENABLE Pulldown Current SET INPUT SET Input Current (All Modes) SET Logic-Low Set Logic-High VILSET VIHSET 2.4 TA = +25NC TA = +125NC -50 0.2 0.4 +50 nA FA V V VIL VIH (Note 6) 2.4 0.65 0.4 V V FA VOL MAX16910__9/V+, VOUT falling MAX16910__8/V+, VOUT falling VOUT rising VOUT falling (Note 5) ISINK = 0.5mA, RESET asserted RESET not asserted, RESET = 7V, TA = +25NC RESET not asserted, RESET = 7V, -40NC TA +125NC 0.03 90 85 92.5 87.5 5 4 0.4 1 94 89 % of VOUT % of VOUT Fs V FA FA VOUT rising, TIMEOUT = OPEN 30 ITO TIMEOUT connected to GND 0.600 1.0 1.25 60 90 1.650 nA ms/nF Fs PSRR tSTART SYMBOL (Note 5) VIN = 6V to 30V, ILOAD = 1mA VIN = 4.8V to 30V, ILOAD = 1mA ILOAD = 1mA to 200mA ILOAD = 1mA to 200mA ILOAD = 10mA, f = 100Hz, 500mVP-P (Note 5) Rising edge of VIN to VOUT, ILOAD = 50mA (Note 5) CONDITIONS MIN TYP +25 1 1 12 12 60 160 MAX UNITS NC mV mV mV mV dB Fs
MAX16910
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5
200mA, Automotive, Ultra-Low Quiescent Current, Linear Regulator MAX16910
ELECTRICAL CHARACTERISTICS (continued)
(VIN = VENABLE = +14V, CTIMEOUT = open, CIN = 1F, COUT = 4.7F, unless otherwise noted. TA = TJ = -40C to +125C, unless otherwise noted. Typical values are TA = +25C.) (Note 2) PARAMETER SETOV INPUT (TRI-MODE) SETOV Input Leakage Current SETOV Low-Level Input Voltage SETOV High-Level Input Voltage Note Note Note Note Note 2: 3: 4: 5: 6: VILSETOV VIHSETOV SYMBOL CONDITIONS SET = HIGH, VSETOV = 5V or SET = GND, VSETOV = 5V SET = GND, VSETOV < VILSETOV or places device in +3.3V fixed output-voltage mode SET = GND, VSETOV > VIHSETOV or places device in +5V fixed output-voltage mode VOUT - 0.4 MIN TYP 1 0.4 MAX UNITS
FA V V
Production tested at TA = +25C. Overtemperature limits are guaranteed by design. Observe the absolute maximum power dissipation limits. Dropout voltage is defined as (VIN - VOUT) when VOUT is 2% below the value of VOUT for VIN = VOUT + 3V. Not production tested. ENABLE is internally pulled to GND.
Typical Operating Characteristics
(VIN = VEN = +14V, CIN = 1F, COUT = 4.7F ceramic, TA = +25C, unless otherwise noted.)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX16910 toc01
GROUND CURRENT vs. LOAD CURRENT
MAX16910 toc02
SHUTDOWN SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX16910 toc03
30 ILOAD = 0 27 24 21 18 15 0 5 10 15 VIN (V) 20 25
80 VOUT = 3.3V 60 TA = -40NC IGND(FA) TA = +125NC TA = +25NC
10 8 6 4
IIN (FA)
40
20
IIN(FA)
2 0 0 5 10 15 VIN (V) 20 25 30
30
0 0 20 40 60 80 100 120 140 160 180 200 ILOAD (mA)
6
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200mA, Automotive, Ultra-Low Quiescent Current, Linear Regulator
Typical Operating Characteristics (continued)
(VIN = VEN = +14V, CIN = 1F, COUT = 4.7F ceramic, TA = +25C, unless otherwise noted.)
SHUTDOWN SUPPLY CURRENT vs. TEMPERATURE
MAX16910 toc04
MAX16910
RESET THRESHOLD vs. TEMPERATURE
MAX16910 toc05
DROPOUT VOLTAGE vs. LOAD CURRENT (5V OUTPUT)
0.45 0.40
DROPOUT VOLTAGE (V)
VOUT = 5V RESET THRESHOLD VOLTAGE (V) 5.2 4.9 4.6 MAX16910_8/V RISING 4.3 MAX16910_8/V FALLING 4.0 MAX16910_9/V RISING MAX16910_9/V FALLING
TA = +150NC
TA = +125NC TA = +25NC TA = -40NC
8 6 VIN = 30V 4 2 0 -50 -25 0 25 50 75 VIN = 14V VIN = 6V
0.35 0.30 0.25 0.20 0.15 0.10 0.05 0 0 20 40 60 80 100 120 140 160 180 200 LOAD CURRENT (mA)
IIN (FA)
100 125 150
-50
-25
0
25
50
75
100 125 150
TEMPERATURE (NC)
TEMPERATURE (NC)
DROPOUT VOLTAGE vs. LOAD CURRENT (3.3V OUTPUT)
MAX16910 toc07
OUTPUT VOLTAGE vs. SUPPLY VOLTAGE
MAX16910 toc08
OUTPUT VOLTAGE vs. SUPPLY VOLTAGE
5.0 4.5 4.0 3.5 VOUT (V) 3.0 2.5 2.0 1.5 ILOAD = 0 SETOV = OUT SET = GND 0 5 10 15 20 VIN (V) 25 30 35 40
MAX16910 toc09
0.50 0.45 0.40 DROPOUT VOLTAGE (V) 0.35 0.30 0.25 0.20 0.15 0.10 0.05 0 0 TA = -40NC
TA = +150NC TA = +125NC TA = +25NC
3.5 3.0 2.5 VOUT (V) 2.0 1.5 1.0 0.5 ILOAD = 0 SETOV = GND SET = GND 0 5 10 15 20 VIN (V) 25 30 35
5.5
1.0 0.5 0 40
20 40 60 80 100 120 140 160 180 200 LOAD CURRENT (mA)
0
OUTPUT VOLTAGE vs.TEMPERATURE
MAX16910 toc10
RESET TIMEOUT PERIOD vs. TEMPERATURE
MAX16910 toc11
POWER-SUPPLY REJECTION RATIO vs. FREQUENCY
-10 -20 PSRR (dB) -30 -40 -50 -60 -70 0.01 0.1 1 10 100 1000 FREQUENCY (kHz) ILOAD = 10mA VIN = 14V + 0.5VP-P
MAX16910 toc12
5.05 ILOAD = 64mA 5.03 5.01 4.99 4.97 4.95 -50 -25 0 25 50 75
60 55 TIMEOUT PERIOD (Fs) 50 45 40 35 30 25 20 CTIMEOUT UNCONNECTED
0
VOUT (V)
100 125 125
-50
-25
0
25
50
75
100 125 150
TEMPERATURE (NC)
TEMPERATURE (NC)
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MAX16910 toc06
10
5.5
0.50
7
200mA, Automotive, Ultra-Low Quiescent Current, Linear Regulator MAX16910
Typical Operating Characteristics (continued)
(VIN = VEN = +14V, CIN = 1F, COUT = 4.7F ceramic, TA = +25C, unless otherwise noted.)
RESET OUTPUT VOLTAGE vs. SINK CURRENT
MAX16910 toc13
RESET TIMEOUT PERIOD vs. TIMEOUT CAPACITANCE
MAX16910 toc14
LOAD-TRANSIENT RESPONSE (5V OUTPUT)
1.5 1.2 0.9 0.6 0.3 0 0.001
1000
MAX16910 toc15
RESET OUTPUT VOLTAGE (V)
TIMEOUT PERIOD (ms)
100
10
VOUT (AC-COUPLED) 100mV/div 180mA
1
IOUT 10mA
0.1 0.01 0.1 1 10 0.01 0.1 1 CTIMEOUT (nF) 10 100 200Fs/div RESET SINK CURRENT (mA)
LOAD-TRANSIENT RESPONSE (3V OUTPUT)
MAX16910 toc16
LINE-TRANSIENT RESPONSE (5V OUTPUT)
MAX16910 toc17
LINE-TRANSIENT RESPONSE (3.3V OUTPUT)
MAX16910 toc18
VOUT (AC-COUPLED) 100mV/div 180mA IOUT 10mA
VOUT (AC-COUPLED) 200mV/div 28V VIN 6V
VOUT (AC-COUPLED) 200mV/div 28V VIN 4.8V
200Fs/div
2ms/div
2ms/div
POWER-UP RESPONSE
MAX16910 toc19
POWER-UP RESPONSE
MAX16910 toc20
IOUT = 0A VIN = VEN
14V VIN 14V VIN 0V 3.3V VOUT 0V 3.3V VOUT 0V 170mA IOUT 0V IOUT = 170mA VEN = VIN 40Fs/div 0A
40Fs/div
8
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200mA, Automotive, Ultra-Low Quiescent Current, Linear Regulator
Typical Operating Characteristics (continued)
(VIN = VEN = +14V, CIN = 1F, COUT = 4.7F ceramic, TA = +25C, unless otherwise noted.)
MAX16910
ENABLE STARTUP RESPONSE
MAX16910 toc21
ENABLE STARTUP RESPONSE
MAX16910 toc22
LOAD-DUMP TRANSIENT RESPONSE
MAX16910 toc23
5V VIN 0V 3.3V VOUT 0A
5V VEN 0V 3.3V VOUT 0V 175mA IOUT 0A
VOUT (AC-COUPLED) 100mV/div 42V VIN 14V
40Fs/div
40Fs/div
100ms/div
Pin Description
PIN 1 2 NAME IN ENABLE FUNCTION Regulator Input. Bypass IN to GND with a 1FF (min) low-ESR ceramic capacitor. Active-High Enable Input. Force ENABLE high (or connect to IN) to turn the regulator on. Pull ENABLE low (or leave unconnected) to place the device in a low-power shutdown mode. ENABLE is internally pulled down to GND through a 0.65FA current sink. Feedback Network Selector. Connect SET to GND when operating the MAX16910 in fixed outputvoltage mode (3.3V or 5V) using the internal feedback network. Connect SET to IN or any voltage higher than 2.4V when an external feedback network (resistive divider) is used, operating the MAX16910 in adjustable output-voltage mode. Active-Low, Open-Drain Reset Output. RESET asserts low when OUT is below the reset threshold, and remains low for the duration of the reset timeout period after the reset conditions end. RESET also asserts low when ENABLE is low and during thermal shutdown. Reset-Timeout-Period Adjust Input. Internal capacitance produces a 60Fs default delay when TIMEOUT is left unconnected. Connect a capacitor from TIMEOUT to GND to set a longer timeout period than default. Regulated Output-Voltage Selector. Connect SETOV to OUT for a 5V fixed output, or connect SETOV to GND for a 3.3V fixed output. SETOV becomes the feedback path when using an external resistive divider for an adjustable output. Ground Regulator Output. Bypass OUT to GND with a minimum of 4.7FF. Use a low-ESR, ceramic capacitor (X7R, X5R) for optimal performance. The SETOV input controls the output voltage when in fixed +3.3V or fixed +5V output-voltage mode. Using an external resistive divider between OUT and SETOV sets adjustable output voltage from +1.5V to +11V. Exposed Pad. EP is internally connected to GND. Connect EP to the ground plane to provide a low thermal-resistance path from the thermal junction to the PCB. Do not use EP as the only electrical connection to GND.
3
SET
4
RESET
5
TIMEOUT
6 7
SETOV GND
8
OUT
--
EP
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9
200mA, Automotive, Ultra-Low Quiescent Current, Linear Regulator MAX16910
Functional Diagram
IN
OUT
ENABLE
CONTROL LOGIC
OVERCURRENT PROTECTION THERMAL PROTECTION OUTPUTVOLTAGE SELECT MUX RESET TIMEOUT SET SETOV RESET TIMEOUT
1.253V 1.156V (92.5%) or 1.094V (87.5%)
MAX16910
GND
_______________Detailed Description
The MAX16910 low-quiescent current, high-voltage linear regulator is ideal for use in automotive and batteryoperated systems. The device operates from an input voltage of +3.5V to +30V, delivers up to 200mA of load current, and consumes only 20A of quiescent current at no load. The input is +45V tolerant and is designed to operate under load-dump conditions. The MAX16910 can be user configured as either a fixed output voltage (+3.3V or +5V) or an adjustable output voltage using an external resistive divider. The MAX16910 features an open-drain, active-low RESET output with fixed thresholds offered at 92.5% and 87.5% of the output voltage. The RESET output remains low for a fixed period of 60s after the output voltage exceeds its threshold. The RESET delay can be extended with an external capacitor. The MAX16910 includes an enable input short-circuit protection and thermal shutdown.
The SET and SETOV inputs determine the output mode. For the 5V fixed output-voltage mode (see the 5V fixed output circuit in the Typical Operating Circuits), connect SET to GND and SETOV to OUT. For the 3.3V fixed output-voltage mode (see the 3.3V fixed output circuit in the Typical Operating Circuits) connect SET to GND and SETOV to GND.
Fixed Output-Voltage Mode
For the adjustable output-voltage mode (see the adjustable output circuit in the Typical Operating Circuits), connect SET to IN or a voltage > 2.4V and connect SETOV to a resistive divider R1 and R2 between OUT and GND. An output voltage between 1.5V and 11V can be selected using the following equation: VOUT = VSETOV x (1 + R1/R2) where VSETOV = 1.25V and R2 should be less than or equal to 100k.
Adjustable Output-Voltage Mode
10
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200mA, Automotive, Ultra-Low Quiescent Current, Linear Regulator
ENABLE is an active-high, logic-level enable input that turns the device on or off. Drive ENABLE high to turn the device on. An internal 0.65A pulldown current keeps the MAX16910 in shutdown mode when driven by a three-state driver in high-impedance mode, or an open-drain driver. When in shutdown, the MAX16910 consumes only 1.6A. ENABLE withstands voltages up to 45V, allowing it to be driven by high-input level voltages or connected to IN for always-on operation. The MAX16910 features thermal protection. When the junction temperature exceeds +180C, an internal thermal sensor turns off the pass transistor, and allows the device to cool. The thermal sensor turns on the pass transistor again after the junction temperature cools by 25C. This results in a cycled output during continuous thermal-overload conditions. Thermal protection protects the MAX16910 in the event of fault conditions. For continuous operation, do not exceed the absolute maximum junction temperature rating of +150C. The MAX16910 features a 330mA current limit. The output can be shorted to GND continuously without damage to the device. During a short circuit, the power dissipated across the pass transistor can quickly heat the device. When the die temperature reaches +180C, the MAX16910 turns off the pass transistor and automatically restarts after the die temperature has cooled by 25C. The MAX16910 features an active-low, open-drain reset output. Once the monitored output voltage exceeds the reset threshold voltage, RESET remains low for the reset timeout period and then goes high. RESET changes from high to low whenever the monitored output voltage drops below the reset threshold voltage. RESET also asserts low when ENABLE is low and during thermal shutdown. The MAX16910 features a reset timeout period adjustable input. The internal capacitance produces a 60s default delay when TIMEOUT is left unconnected. Connect a capacitor from TIMEOUT to GND to set a higher timeout period than default. Use the following formula to determine the reset timeout capacitor: CTIMEOUT = 0.8 x ITO x TTIMEOUT
ENABLE
where CTIMEOUT is in nF, ITO is in A, and TTIMEOUT is in ms. For example, if ITO is 1A, CTIMEOUT needs to be 8nF to get a 10ms delay.
MAX16910
___________Applications Information
Output-Capacitor Selection and Regulator Stability
Thermal Protection
For stable operation over the full temperature range, with fixed 3.3V and 5.0V output voltages, use a low-ESR 4.7F capacitor. For resistor-programmed output voltages, a 10F low-ESR ceramic capacitor is recommended for stable operation. Use larger output-capacitor values such as 22F to reduce noise, improve load-transient response and power-supply rejection. Some ceramic dielectrics exhibit large capacitance and ESR variations with temperature. To improve power-supply rejection and transient response, use a capacitor larger than the minimum 1F capacitor between IN and GND. The MAX16910 provides up to 200mA of continuous output current. The input voltage range extends to 30V. Package power dissipation limits the amount of output current available for a given input/output voltage and ambient temperature. Figure 1 shows the maximum allowable power dissipation for these devices to keep the junction temperature below +150C. Figure 1 assumes that the exposed metal pad of the MAX16910 is soldered to a 1in2 of multilayer copper board. Use Figure 1 to determine the allowable package dissipation for a given ambient temperature. Alternately, use the following formulas to calculate the allowable power dissipation PD. For the TDFN-EP package:
1.951W for TA +70C PD = W 1.951W - 0.0244 C x ( TA - 70C) for + 70C TA < +125C
Available Output-Current Calculation
Output Short-Circuit Current Limit
RESET Output
Timeout
For the SO-EP package:
1.861W for TA +70C PD = W 1.861W - 0.0233 C x ( TA - 70C) for + 70C TA < +125C
______________________________________________________________________________________
11
200mA, Automotive, Ultra-Low Quiescent Current, Linear Regulator MAX16910
After determining the allowable power dissipation, calculate the maximum allowable output current, without exceeding the +150C junction temperature, using the following formula: The reset timeout period is adjustable to accommodate a variety of microprocessor applications. Adjust the reset timeout period by connecting a capacitor between TIMEOUT and GND.
Selecting Timeout Capacitor
IOUT(MAX)
=
PD VIN - VOUT
t RP =
The above equations do not include the negligible power dissipation from self-heating due to the device ground current. Example 1 (TDFN-EP Package): TA = +125C, VIN = 16V, VOUT = 3.3V Calculate the maximum allowable power dissipation at the given temperature as follows:
1.25 x C TIMEOUT I TO
where tRP is in ms and CTIMEOUT is in nF. Leave TIMEOUT unconnected to select the internally fixed timeout period. CTIMEOUT must be a low-leakage (< 10nA) type capacitor. Ceramic capacitors are recommended; do not use capacitor values lower than 100pF to avoid the influence of parasitic capacitances. The MAX16910 package features an exposed thermal pad on its underside that should be used as a heatsink. This pad lowers the package's thermal resistance by providing a direct heat-conduction path from the die to the PCB. Connect the exposed pad and GND to the system ground using a large pad or ground plane, or multiple vias to the ground plane layer.
Exposed Pad
W PD = 1.951W - 0.0244 x (125C - 70C) = 609mW C
And establish the maximum output current:
I OUT(MAX)
=
609mW 48mA 16V - 3.3V
Example 2 (TDFN-EP Package): TA = +50C, VIN = 9V, VOUT = 5V Calculate the maximum allowable power dissipation at the given temperature as follows: PD = 1.951W
PD (W) 2.4 2.2 2.0 1.8 1.6 1.4 1.2 1.0 0.8 DERATE 23.3mW/C 1.861W 8-PIN SO-EP 1.951W 8-PIN TDFN-EP
Find the maximum output current:
IOUT(MAX) = 1.951W = 488mA IOUT(MAX) = ISC = 330mA (typ) 9V - 5V
DERATE 24.4mW/C
In Example 2, the maximum output current is calculated as 488mA. The allowable output current cannot exceed the given internal current limit for the device of 330mA (typ).
0.6 0.4 0.2 0 0 20 40 60 80 100 120 140 TEMPERATURE (C)
Figure 1. Calculated Maximum Power Dissipation vs. Ambient Temperature
12
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200mA, Automotive, Ultra-Low Quiescent Current, Linear Regulator
________________________________________________________________Selector Guide
PART MAX16910CATA8/V+ MAX16910CATA9/V+ MAX16910CASA8/V+ MAX16910CASA9/V+ RESET THRESHOLD (%) 87.5 92.5 87.5 92.5 IOUT (mA) 200 200 200 200 PIN-PACKAGE 8 TDFN-EP* (3mm x 3mm) 8 TDFN-EP* (3mm x 3mm) 8 SO-EP* (5mm x 4mm) 8 SO-EP* (5mm x 4mm)
MAX16910
+Denotes a lead(Pb)-free/RoHS-compliant package. /V Denotes an automotive qualified part. *EP = Exposed pad.
__________________________Chip PROCESS: BiCMOS DMOS
Information
PACKAGE TYPE
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. PACKAGE CODE DOCUMENT NO. 21-0137 21-0111
8 TDFN-EP
8 SO-EP
T833+2 S8E+12
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
(c)
13
2009 Maxim Integrated Products
Maxim is a registered trademark of Maxim Integrated Products, Inc.

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