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general description the max16999 linear regulator operates from a 2.5v to 5.5v input voltage and delivers 100ma continuous load current with a low quiescent current typically around 13a. the output voltage is preset to internally trimmed voltages in the 0.5v to 3.3v range (see the selector guide ). an active-low, open-drain reset output remains low for a programmable timeout delay after the output voltage reaches regulation. the reset timeout is pro - grammed by an external capacitor connected to cres. this device also features logic-controlled shutdown, and short-circuit and thermal-overload protection. the typical applications are multimedia, telematics, and motor control microcontrollers (cs) with always-on requirements. the max16999 is used as a parallel, lowquiescent supply to power the core or interrupt section of cs during sleep mode. it can also be used to supply a timer or memory during c shutoff. the adjustable por delay assists with power-supply sequencing. applications industrial sdram power supplies keep-alive timers handheld/portable devices features preset 0.5v to 3.3v output voltage range up to 100ma output current at t a = +125c 13a quiescent current logic-controlled enable adjustable por delay flag short to gnd protection on reset timer used in parallel with high-current supply of equal voltages thermal-overload and short-circuit protection tiny 8-pin max ? package with exposed pad selector guide appears at end of data sheet. max is a registered trademark of maxim integrated products, inc. 19-4114; rev 2; 2/15 * insert the desired two-digit suffix (see the selector guide ) into the blanks to complete the part number. contact the factory for other output voltages or other package options. + denotes a lead(pb)-free/rohs-compliant package. ** ep = exposed pad. part* temp range pin-package max16999aua_ _+ -40c to +125c 8 max-ep** input 2.5v to 5.5v output 0.5v to 3.3v on c in 1f off to controller gnd in out cres reset en ep logic supply max16999 c out 4.7f c cres 15nf 12 34 + 8 7 6 5 in in engnd *exposed pad * reset cres out out max16999 max top view max16999 ultra-low output voltage, low-quiescent-current linear regulator for high-temperature applications typical operating circuit pin coniguration ordering information downloaded from: http:///
in, reset to gnd ............................................... -0.3v to +6.0v out, cres, en to gnd ............................ -0.3v to (v in + 0.3v) output short-circuit duration .................................... continuous continuous power dissipation (t a = +70c) (note 1) (derate 10.3mw/c above +70c) max (single-layer pcb) ......................................... 824.7mw (derate 12.9mw/c above +70c) max (multilayer pcb) .......................................... 1030.9mw package junction-to-case thermal resistance ( jc ) ... 4.8c/w package junction-to-ambient thermal resistance ( ja ) (single-layer pcb) ....................................................... 97c/w package junction-to-ambient thermal resistance ( ja ) (multilayer pcb) ....................................................... 77.6c/w operating temperature range ......................... -40c to +125c junction temperature ...................................................... +150c storage temperature range ............................ -60c to +150c lead temperature (soldering, 10s) ................................. +300c (for devices with v out 1.5v, v in = 3.3v. for devices with v out > 1.5v, v in = 5v. en = in, t j = -40c to +125c, c in = 1f, c out = 4.7f, c cres = 1000pf, unless otherwise noted. typical values are at t a = +25c.) (note 2) parameter symbol conditions min typ max units in operating voltage v in 2.5 5.5 v in undervoltage-lockout (uvlo) threshold v uvlo v in rising 1.94 2.2 v in uvlo hysteresis 45 mv output-voltage accuracy v in = v out + 2v v out 1.5v, i out = 1ma to 80ma -2.5 +2.5 % v out > 1.5v, i out = 1ma to 100ma -2.5 +2.5 current limit i lim out = gnd 105 150 ma ground current i q i out = 100a 13 20 a i out = 100ma 23 dropout voltage v in - v out i out = 80ma, v out = 3.3v (note 3) 0.035 0.1 v load regulation v out /i out i out = 1ma to 80ma 0.1 mv/ma line regulation v out /v in i out = 80ma v out < 1v, 2.5v < v in < 5.5v 0.4 mv/v v out 1v, (v out + 1.5v) < v in < 5.5v 1.8 power-supply rejection ratio psrr i out = 10ma, 500mv p-p , v in - v out > 1.5v f = 100hz 70 db f = 100khz 40 max16999 ultra-low output voltage, low-quiescent-current linear regulator for high-temperature applications www.maximintegrated.com maxim integrated 2 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.maximintegrated.com/thermal-tutorial . absolute maximum ratings stresses beyond those listed under absolute maximum ratings may cause permanent damage to the devi ce. 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. dc electrical characteristics downloaded from: http:///
(for devices with v out 1.5v, v in = 3.3v. for devices with v out > 1.5v, v in = 5v. en = in, t j = -40c to +125c, c in = 1f, c out = 4.7f, c cres = 1000pf, unless otherwise noted. typical values are at t a = +25c.) (note 2) note 2: limits are 100% production tested at t a = +25c. limits over the operating temperature range are guaranteed by design. note 3: dropout voltage is defined as v in - v out when v out is 2% below its value for v in = v out + 2v. parameter symbol conditions min typ max units en standby current i stb en = gnd 0.3 1 a turn-on delay from en = high to v out = 100mv 10 s logic levels en h circuit active 70 %v in en l circuit inactive 30 pullup resistance r en-h v en = 75% v in 120 k? pulldown resistance r en-l v en = 25% v in 120 k? reset threshold accuracy v res v out falling 79.5 82.5 85.5 %v out threshold hysteresis v res,hyst 2.5 %v out reset open-drain leakage reset = high impedance, v reset = 5mv 200 na output low voltage v res,ol i load = 250a 100 mv reset timeout t rsoff cres = gnd 30 80 ms output deglitch time t deglitch v out < v res 30 s cres charge current i cres,up 8 10 12 a discharge current i cres,dn 1 ma threshold v cres,thrs reset goes from low to high impedance 575 600 625 mv thermal protection thermal shutdown temperature t shdn +165 c thermal shutdown hysteresis t shdn 15 c max16999 ultra-low output voltage, low-quiescent-current linear regulator for high-temperature applications www.maximintegrated.com maxim integrated 3 dc electrical characteristics (continued) downloaded from: http:///
(for devices with v out < 1.5v, v in = 3.3v. for devices with v out > 1.5v, v in = 5v. en = in, c in = 1f, c out = 4.7f, c cres = 1000pf, t a = + 25c, unless otherwise noted.) output voltage vs. input voltage max16999 toc02 input voltage (v) output voltage (v) 5.0 4.5 4.0 3.5 3.0 0.995 0.996 0.997 0.998 0.999 1.000 1.001 1.002 1.003 1.0040.994 2.5 5.5 i out = 0.1ma i out = 50ma i out = 100ma i out = 1ma output-voltage accuracy vs. temperature max16999 toc03 temperature (c) output-voltage accuracy (%) 100 50 0 -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 -0.5 -50 150 i out = 0.1ma i out = 50ma i out = 100ma i out = 1ma v out = 1v ground-pin current vs. load current max16999 toc04 load current (ma) ground-pin current (a) 80 60 20 40 5 10 15 20 3025 35 40 0 0 100 v out = 0.5v v out = 3.3v v out = 1v ground-pin current vs. input voltage max16999 toc05 input voltage (v) ground-pin current (a) 5 4 3 2 1 5 10 15 20 25 30 35 40 45 50 0 0 6 i out = 0.1ma i out = 50ma i out = 100ma i out = 1ma v out = 0.5v ground-pin current vs. temperature max16999 toc06 temperature (c) ground-pin current (a) 125 100 75 50 25 0 -25 5 10 15 20 25 30 0 -50 150 i out = 0.1ma i out = 50ma i out = 100ma i out = 1ma v out = 1v current limit vs. input voltage max16999 toc07 input voltage (v) current limit (ma) 5.0 4.5 3.0 3.5 4.0 135 140 145 150 155 160 165 170130 2.5 5.5 output-voltage accuracy vs. load current max16999 toc01 load current (ma) output-voltage accuracy (%) 80 60 40 20 -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 -0.5 0 100 v out = 0.5v v out = 3.3v v out = 1v dropout voltage vs. load current max16999 toc08 load current (ma) dropout voltage (ma) 125 100 75 50 25 10 20 30 40 50 60 70 80 90 100 0 0 150 v out = 3.3v power-supply rejection ratio vs. frequency max16999 toc09 frequency (khz) psrr (db) 100 10 0.1 1 10 20 30 40 50 60 70 80 0 0.01 1000 v out = 0.5v, i out = 10ma max16999 ultra-low output voltage, low-quiescent-current linear regulator for high-temperature applications maxim integrated 4 www.maximintegrated.com typical operating characteristics downloaded from: http:///
(for devices with v out < 1.5v, v in = 3.3v. for devices with v out > 1.5v, v in = 5v. en = in, c in = 1f, c out = 4.7f, c cres = 1000pf, t a = + 25c, unless otherwise noted.) line-transient response max16999 toc10 200s/div v in v out 3.5v 4v100mv/div ac-coupled v out = 0.5v line-transient response near dropout max16999 toc11 200s/div v in v out 0.6v 1.6v200mv/div ac-coupled v out = 0.5v load-transient response max16999 toc12 200s/div i out v out 0 50ma/div100mv/div ac-coupled v out = 3.3v load-transient response near dropout max16999 toc13 200s/div i out v out 0 50ma/div100mv/div ac-coupled v out = 3.3v, v in = v out + 50mv shutdown response max16999 toc14 100s/div v en v out 00 5v1v v out = 1v, i out = 50ma reset/enable response max16999 toc15 400s/div v en v out 00 5v0 5v 1v v out = 1v, i out = 50ma, c cres = 15,000pf v reset max16999 ultra-low output voltage, low-quiescent-current linear regulator for high-temperature applications maxim integrated 5 www.maximintegrated.com typical operating characteristics (continued) downloaded from: http:///
(for devices with v out < 1.5v, v in = 3.3v. for devices with v out > 1.5v, v in = 5v. en = in, c in = 1f, c out = 4.7f, c cres = 1000pf, t a = + 25c, unless otherwise noted.) pin name function 1, 2 out regulator output. bypass out to gnd with a 4.7f ceramic capacitor. out becomes high impedance when en is low. 3 cres por timer. bypass cres to gnd with a ceramic capacitor to deine por timing (see the por timer section). 4 reset open-drain, active-low reset output. reset is high impedance when output is in regulation or if the ic is in shutdown. reset is pulled low when v out drops below 82.5% (typ) of its nominal voltage. 5 gnd ground. connect gnd to a large circuit board ground plane and directly to the exposed paddle. 6 en active-high enable input. drive en low to place the regulator in standby mode. drive en high or connect to in for normal operation. 7, 8 in regulator input. bypass in to gnd with at least a 1f ceramic capacitor. ep exposed paddle. connect ep to a large pad or circuit board ground plane to maximize power dissipatio n. ep serves as a heatsink. line/reset response max16999 toc16 2ms/div v in v out 00 2v/div0 5v 500mv/div v out = 0.5v, i out = 50ma, c cres = 15,000pf v reset cres pullup current vs. temperature max16999 toc17 temperature (c) cres pullup current (a) 125 100 50 75 0 25 -25 2 4 6 8 10 12 14 16 18 20 0 -50 150 v out = 1v, c cres = 15,000pf reset timeout vs. cres capacitance max16999 toc18 cres capacitance (nf) reset timeout (ms) 400 300 200 100 5 10 15 20 25 30 0 0 500 short-circuit response max16999 toc19 200s/div v out i out 00 5v0 5a 5v v out = 3.3v v reset max16999 ultra-low output voltage, low-quiescent-current linear regulator for high-temperature applications www.maximintegrated.com maxim integrated 6 pin description typical operating characteristics (continued) downloaded from: http:///
figure 1. block diagram in error amplifier v ref 0.825 x v ref v cres,thrs 100k ? out cres ep reset en gnd max16999 por comparator cres comparator 20s deglitch logic control i cres,up (10a) i cres,down (10ma) counter (100ms) max16999 ultra-low output voltage, low-quiescent-current linear regulator for high-temperature applications www.maximintegrated.com maxim integrated 7 downloaded from: http:///
detailed description the max16999 is a low-quiescent-current linear regula - tor designed for applications requiring high reliability. this device can supply loads up to 100ma and is available in factory-preset output voltages from 0.5v to 3.3v (see the selector guide ). as illustrated in figure 1, the max16999 linear regulator consists of a reference, an error amplifier, a p-channel mosfet pass transistor, and an internal feedback voltage-divider. a power-on reset section signals if the output voltage has come out of regulation. the reset signal timeout is defined by the charging time of an exter - nal capacitor attached to cres. to increase system reliability, the max16999 features a por reset timeout along with overcurrent and overtem - perature protection. a power-on reset timeout guarantees startup even with a faulty timing capacitor. parameters are guaranteed up to +125c junction temperature. the en signal is latched in its last state even if the signal line becomes disconnected. logic-controlled enable the max16999 provides a logic-enable input (en). for normal operation drive en to logic-high. when en is driv - en high, the linear regulator starts to regulate by increas - ing the output voltage up to the preset value. to disable the device, drive en low to set out to high impedance this enables a pulldown current from cres to discharge the capacitor. once the device is disabled, the input sup - ply current reduces to less than 0.3a. the en input is latched into its last state by a 120k internal resistor. to change state, the latch needs to be overridden. when en is low, the reset output is high impedance. por timer once the output voltage rises above the threshold v res , two internal timers are simultaneously activated. the reset timer is realized by means of a pullup current i cres,up that charges the capacitor connected to cres. as soon as the voltage on c res rises above the threshold of 600mv (typ), reset goes high impedance. the internal reset timer is set by the value of the external capacitance (c cres ). calculate the reset time using the following formula: 3 por_delay cres v t c x 60 x 10 a = where c cres is in farads and the delay to gnd is given in seconds.the second timer is an internal fault timer and ensures the regulator does not stay off indefinitely because of a fault on cres such as a short. the fault timer runs for a maxi - mum of 100ms. a logic block monitors both internal timers to determine the shortest timeout. if the first timeout is the fault timer, the pullup current is switched off in order to avoid unnecessary current consumption and a resistive pulldown is also activated. if t por_delay exceeds 100ms (typ) the fault timer defines the timeout behavior. current limit once the output voltage reaches regulation, the output current is limited to 150ma (typ). if the output current exceeds the current limit, the output voltage begins to decrease. thermal-overload protection thermal-overload protection limits total power dissipa - tion in the max16999. when the junction temperature exceeds +165c, a thermal sensor turns off the pass tran - sistor, allowing the ic to cool. the thermal sensor turns the pass transistor on again after the junction temperature cools by 15c, resulting in a pulsed output during con - tinuous thermal-overload conditions. thermal-overload protection safeguards the max16999 in the event of fault conditions. for continuous operation, do not exceed the absolute maximum junctiontemperature rating of +150c. table 1 lists maximum dc output currents (milliamps) that are allowed for operation at t a = +125c without causing thermal shutdown of the max16999. max16999 ultra-low output voltage, low-quiescent-current linear regulator for high-temperature applications www.maximintegrated.com maxim integrated 8 downloaded from: http:///
undervoltage lockout (uvlo) before the max16999 can operate, the input voltage must exceed the uvlo threshold of 2.2v (max) with a 30mv hysteresis. if the input voltage is below the uvlo threshold, out becomes high impedance and en is ignored regardless if it is driven high or low. applications information capacitor selection capacitors are required at the max16999 input and out - put for stable operation over the full temperature range and with load currents up to 100ma. connect a 1f ceramic capacitor between in and gnd and a 4.7f ceramic capacitor between out and gnd. the input capacitor (c in ) lowers the source impedance of the input supply. use larger output capacitors to reduce noise and improve stability and power-supply rejection. the output capacitors equivalent series resistance (esr) affects stability and output noise. use output capacitors with an esr of 30m or less to ensure stability and optimize transient response. surface-mount ceramic capacitors have very low esr and are commonly available in val - ues up to 10f. connect c in and c out as close to the max16999 as possible to minimize the impact of the pcb trace inductance. using max16999 in parallel with another supply the max16999 can be used in parallel with another sup - ply of equal voltage (see figure 2). the circuit shows a typical low-power solution for a c. figure 2. low-quiescent c supply solution table 1. output currents at t a = +125c v out (v) single-layer board multilayer board v in = 3.3v (ma) v in = 5v (ma) v in = 5v (ma) 0.5 92 57 72 0.6 95 59 73 0.7 99 60 75 0.8 100 61 77 0.9 100 63 79 1.0 100 64 81 1.1 100 66 83 1.2 100 68 85 1.5 100 74 92 1.8 100 81 100 2.5 100 100 100 3.3 100 100 100 4v to 36v 3.3v, 1a low-iqinterface supply 1.2v, 3acore supply to c 1.2v low-iqcore bypass max1745 max8693 max16999 max16999 ultra-low output voltage, low-quiescent-current linear regulator for high-temperature applications www.maximintegrated.com maxim integrated 9 downloaded from: http:///
note: bold indicates a standard value. for other values, contact factory for availability. nonstandard options require a 5k minimum quantity order. suffix v out (v) top mark 05 0.5 +aabe 06 0.6 +aabv 07 0.7 +aabw 08 0.8 +aabx 09 0.9 +aabq 10* 1.0 +aabf 11 1.1 +aaby 12 1.2 +aabr 13 1.3 +aabz 15 1.5 +aabs 18 1.8 +aabt 25 2.5 +aabu 33* 3.3 +aabg package type package code outline no. land pattern no. 8 max-ep u8e+2 21-0107 90-0145 max16999 ultra-low output voltage, low-quiescent-current linear regulator for high-temperature applications www.maximintegrated.com maxim integrated 10 selector guide 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 process: bicmos downloaded from: http:///
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 speciications without n otice 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. max16999 ultra-low output voltage, low-quiescent-current linear regulator for high-temperature applications ? 2015 maxim integrated products, inc. 11 revision number revision date description pages changed 0 4/08 initial release 1 12/14 removed reference to aec-100 qualiication in the features section; removed reference to automotive applications in the detailed description section 1, 8 2 2/15 updated top marks in the selector guide 10 revision history for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim integrateds website at www.maximintegrated.com. downloaded from: http:///

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