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this is information on a product in full production. october 2012 doc id 023747 rev 1 1/25 25 STOD13AM 250 ma dual dc-dc converter for powering amoled displays datasheet ? production data features step-up and inverter converters operating input voltage range from 2.5 v to 4.5 v synchronous rectification for both dc-dc converters minimum 250 ma output current 4.6 v fixed positive output voltage programmable negative voltage by s wire from - 2.4 v to - 5.4 v at 100 mv steps typical efficiency: 85% pulse-skipping mode in light load condition 1.5 mhz pwm mode control switching frequency tdma noise high immunity enable pin for shutdown mode low quiescent current in shutdown mode soft-start with inrush current protection overtemperature protection temperature range: - 40 c to 85 c true-shutdown mode fast discharge outputs of the circuits after shutdown overload protection short-circuit protection package dfn12l (3 x 3 mm) 0.6 mm height applications active matrix oled power supply in portable devices cellular phones camcorders and digital still cameras multimedia players description the STOD13AM is a dual dc-dc converter for amoled display panels. it integrates a step-up and an inverting dc-dc converter making it particularly suitable for battery operated products, in which the major concern is overall system efficiency. it works in pulse-skipping mode during low load conditions and pwm mode at 1.5 mhz frequency for medium/high load conditions. the high frequency allows the value and size of external components to be reduced. the enable pin allows the device to be turned off, therefore reducing the current consumption to less than 1 a. the negative output voltage can be programmed by an mcu through a dedicated pin which implements single-wire protocol. soft-start with controlled inrush current limit, thermal shutdown, and short-circuit protection are integrated functions of the device. dfn12l (3 x 3 mm) table 1. device summary order code positive voltage negative voltage package packaging STOD13AMtpur 4.6 v - 2.4 v to - 5.4 v dfn12l (3 x 3 mm) 3000 parts per reel www.st.com
contents STOD13AM 2/25 doc id 023747 rev 1 contents 1 schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3 maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 5 typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 6 detailed description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 6.1 swire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 6.1.1 swire features and benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 6.1.2 swire protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 6.1.3 swire basic operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 6.2 negative output voltage levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 6.3 enable, s wire and fd . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 7 application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 7.1 external passive components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 7.1.1 inductor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 7.1.2 input and output capacitor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 7.2 recommended pcb layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 8 detailed description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 8.1 general description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 8.1.1 multiple operation modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 8.1.2 pulse-skipping operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 8.1.3 discontinuous conduction mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 8.1.4 continuous conduction mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 8.1.5 enable pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 8.1.6 soft-start and inrush current limiting . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 8.1.7 undervoltage lockout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 8.1.8 overtemperature protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
STOD13AM contents doc id 023747 rev 1 3/25 8.1.9 short-circuit protection during soft-start (ssd) . . . . . . . . . . . . . . . . . . . 17 8.1.10 overload protection (olp) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 8.1.11 short-circuit protection (scp) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 8.1.12 fast discharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 9 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 10 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
schematic STOD13AM 4/25 doc id 023747 rev 1 1 schematic figure 1. application schematic s tod1 3 am vo2 lx1 vina s -wire en vref vmid cmid co2 lx2 vinp cin cref l2 pgnd agnd vbat fd l1 am127 88 v1 s -wire en fd table 2. typical external components comp. manufacturer part number value size ratings l 1 (1) coilcraft murata lps4012-472ml lqh3npn4r7mm0 4.7 h 4.0 x 4.0 x 1.2 3.0 x 3.0 x 1.5 20%, i = 1.7a, r = 0.175 20%, i = 1.25a, r = 0.13 l 2 (2) coilcraft murata lps4012-472ml lqh3npn4r7mm0 4.7 h 4.0 x 4.0 x 1.2 3.0 x 3.0 x 1.5 20%, i = 1.7a, r = 0.175 20%, i = 1.25a, r = 0.13 c in murata grm219r61a106ke44 2 x 10 f 0805 10%, x5r, 10 v c mid murata grm219r61a106ke44 10 f 0805 10%, x5r, 10 v c o2 murata grm219r61a106ke44 2 x 10 f 0805 10%, x5r, 10 v c ref murata grm185r60j105ke26 1 f 0603 10%, x5r, 6.3 v 1. a 250 ma load can be provided with inductor saturation current as a minimum of 0.9 a. 2. at - 5.4 v, a 250 ma load can be provided with inductor saturation current as a minimum of 1.4 a. see section 7.1.1 .
STOD13AM schematic doc id 023747 rev 1 5/25 figure 2. block schematic am12789v1 uvlo logic control otp s -wire ring killer vref o s c s tep-up control fa s t di s charge dmd inverting control fa s t di s charge dmd s s s s v ina en s wire v ref agnd pgnd # # vref s -wire control n1 s v inp v mid v o2 l x1 l x2 p1a p1b p2 n2 fd ss d s cp olp vo2 lx current s en s e vinp
pin configuration STOD13AM 6/25 doc id 023747 rev 1 2 pin configuration figure 3. pin configuration (top view) table 3. pin description pin pin n description lx 1 1 boost converter switching node pgnd 2 power ground pin v mid 3 boost converter output voltage fd 4 fast discharge control pin. when pulled low, the fast discharge after shutdown is active. when pulled high, the fast discharge is off agnd 5 signal ground pin. this pin must be connected to the power ground layer v ref 6 voltage reference output. 1 f bypass capacitor must be connected between this pin and agnd s wire 7 negative voltage setting pin en 8 enable control pin. high = converter on; low = converter in shutdown mode v o2 9 inverting converter output voltage lx 2 10 inverting converter switching node v in a 11 analogic input supply voltage v in p 12 power input supply voltage exposed pad internally connected to agnd. exposed pad must be connected to ground layers in the pcb layout in order to guarantee proper operation of the device
STOD13AM maximum ratings doc id 023747 rev 1 7/25 3 maximum ratings note: absolute maximum ratings are those values beyond which damage to the device may occur. functional operation under these conditions is not implied. the lx1 and lx2 have high slew rate and they can be above the absolute maximum rating during operation due to the parasitic inductance in the pcb and scope probe. an absolute maximum rating of lx1 and lx2 is related to voltage supplied by an external source so the internally generated lx1 and lx2 voltage during normal operation doesn't damage the chipset. table 4. absolute maximum ratings symbol parameter value unit v ina , v inp dc supply voltage -0.3 to 6 v en, s wire logic input pins -0.3 to 4.6 v fd logic input pin -0.3 to v ina +0.3 v il x2 inverting converter switching current internally limited a l x2 inverting converter switching node voltage -10 to v inp + 0.3 v v o2 inverting converter output voltage -10 to agnd + 0.3 v v mid step-up converter and ldo output voltage -0.3 to 6 v l x1 step-up converter switching node voltage -0.3 to v mid + 0.3 v il x1 step-up converter switching current internally limited a v ref reference voltage -0.3 to 3 v p d power dissipation internally limited mw t stg storage temperature range -65 to 150 c t j maximum junction temperature 150 c esd human body model protection 2 kv machine body model protection 200 v table 5. thermal data symbol parameter value unit r thja thermal resistance junction-ambient 33 c/w r thjc thermal resistance junction-case (fr-4 pcb) (1) 2.12 c/w 1. the package is mounted on a 4-layer (2s2p) jedec board as per jesd51-7.
electrical characteristics STOD13AM 8/25 doc id 023747 rev 1 4 electrical characteristics t j = 25 c, v ina = v inp = 3.7 v, i mid,o2 = 30 ma, c in = 2 x 10 f, c mid = 10 f, c o2 = 2 x 10 f, c ref = 1 f, l1 = l2 = 4.7 h, v en = 2 v, v mid = 4.6 v, v o2 = -4.9 v unless otherwise specified. table 6. electrical characteristics symbol parameter test conditions min. typ. max. unit general section v ina, v inp supply input voltage 2.5 3.7 4.5 v uvlo_h undervoltage lockout high v ina rising 2.22 2.25 v uvlo_l undervoltage lockout low v ina falling 1.9 2.18 v i_ vi input current no load condition 1.7 2.1 ma i q_sh shutdown current v en =v sw =gnd t j =-40 c to +85 c 1a v en h enable high threshold v ina =2.5 v to 4.5 v, t j =-40 c to +85 c 1.2 v v en l enable low threshold 0.4 i en enable input current v en =v ina =4.5 v; t j =-40 c to +85 c 1a v fd h fast discharge high threshold v ina =2.5 v to 4.5 v, t j =-40 c to +85 c 1.2 v v fd l fast discharge low threshold 0.4 i fd fast discharge input current v fd =v ina =4.5 v; t j =-40 c to +85 c 50 a fs switching frequency pwm mode 1.35 1.5 1.65 mhz d1 max step-up maximum duty cycle no load 87 % d2 max inverting maximum duty cycle no load 87 % total system efficiency i mid,o2 =10 to 30 ma, v mid =4.6 v, v o2 =-4.9 v 78 % i mid,o2 =30 to 150 ma, v mid =4.6 v, v o2 =-4.9 v 85 i mid,o2 =150 to 250 ma, v mid =4.6 v, v o2 =-4.9 v 82 v ref reference voltage i ref =10 a 1.208 1.220 1.232 v i ref reference current capability @ 98.5% of no load reference voltage 100 a step-up converter section v mid positive output voltage 4.6 v positive output voltage total variation v ina =v inp =2.9 v to 4.5 v; i mid =5 ma to 250 ma, i o2 no load t j = -40 c to +85 c - 0.8 0.8 %
STOD13AM electrical characteristics doc id 023747 rev 1 9/25 symbol parameter test conditions min. typ. max. unit v mid lt line transient v ina,p =3.4 v to 2.9 v, i mid =100 ma; t r =t f =10 s -10 mv v mid t load transient response i mid =3 to 30 ma and i mid =30 to 3 ma, t r =t f =150 s 20 mv i mid =10 to 100 ma and i mid =100 to 10 ma, t r =t f =150 s 25 mv tdma noise undershoot/overshoot i mid =10 to 50 ma; i o2 no load (1) 20 mv static variation between low and high v in level 4 i mid max maximum output current v ina,p =2.9 v to 4.5 v 250 ma i-l 1max step-up inductor peak current v mid 10% below nominal value 1.08 1.32 a step-up converter section r dson p1 p-channel static drain-source on-resistance v ina =v inp =3.7 v, i sw-p1 =100 ma 1.0 2.0 r dson n1 n-channel static drain-source on-resistance v ina =v inp =3.7 v, i sw-n1 =100 ma 0.4 1.0 inverting converter section v o2 negative output voltage range 41 different values set by s wire pin (see section 6.1.2 ) -6.4 -2.4 v negative output voltage -4.9 v negative output voltage total variation v ina =v inp =2.9 v to 4.5 v; i o2 =5 ma to 250 ma, i mid no load t j =-40 c to +85 c -1.7 1.7 % v o2 lt line transient v ina,p =3.4 v to 2.9 v, i o2 =100 ma, t r =t f =10 s +10 mv v o2 t load transient response i o2 =3 to 30 ma and i o2 =30 to 3 ma, t r =t f =150 s 20 mv i o2 =10 to 100 ma and i o2 =100 to 10 ma, t r =t f =150 s 25 mv tdma noise undershoot/overshoot i o2 =10 to 50 ma; i mid no load (1) 20 mv static variation between low and high v in level 5 i o2 max maximum output current v ina,p =2.9 v to 4.5 v - 250 ma i-l 2max inverting peak current v o2 below 10% of nominal value -1.6 -1.3 a r dson p2 p-channel static drain-source on-resistance v ina =v inp =3.7 v, i sw-p2 =100 ma 0.42 0.8 table 6. electrical characteristics (continued)
electrical characteristics STOD13AM 10/25 doc id 023747 rev 1 symbol parameter test conditions min. typ. max. unit r dson n2 n-channel static drain-source on-resistance v ina =v inp =3.7 v, i sw-n2 =100 ma 0.43 0.8 thermal shutdown otp overtemperature protection 140 c otp hyst overtemperature protection hysteresis 15 c discharge resistor r dis resistor value no load, en=sw=fd=low 400 t dis discharge time no load, en=sw=fd=low, v mid -v o2 at 10% of nominal value 10 ms 1. v ina,p = 4.2 to 3.7 v, 3.7 to 3.2 v, 3.4 to 2.9 v, f = 200 hz; t on = 3.65 ms; t off = 1.25 ms; t r = t f = 10 s, pulse signal. table 6. electrical characteristics (continued)
STOD13AM typical performance characteristics doc id 023747 rev 1 11/25 5 typical performance characteristics v ina = v inp = 3.7 v, v o2 = -4.9 v, t j = 25 c; see ta b l e 1 for external components used in the tests below. figure 4. maximum power output vs. input voltage figure 5. efficiency vs. output current figure 6. soft-start with ssd figure 7. soft-start and inrush current v ina = v inp = 3.7 v, r mid,o2 < 4 k , l1 = l2 no load 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3 .00 3 .25 3 .50 3 .75 4.00 4.25 4.50 2.5 2.7 2.9 3 .1 3 . 33 .5 3 .7 3 .9 4.1 4. 3 4.5 p_out [w] v_in [v] po1,2 max 65.0 67.5 70.0 72.5 75.0 77.5 8 0.0 8 2.5 8 5.0 8 7.5 90.0 520 3 5 50 65 95 110 125 140 155 170 1 8 52002152 3 0245260 efficiency [ % ] i load [ma] 3.4 v 3.7 v 3.8 v 4 v 4.2 v 4.5 v
typical performance characteristics STOD13AM 12/25 doc id 023747 rev 1 figure 8. fast discharge no load, en=sw=fd=low figure 9. switching and output waveforms v ina = v inp = 2.9 v, i mid,o2 = 250 ma, t a = 25 c figure 10. step-up ccm operation figure 11. inverting ccm operation v ina = v inp = 2.9 v, i mid = 100 ma, t a = 25 c v ina = v inp = 2.9 v, i mid = 100 ma, t a = 25 c
STOD13AM detailed description doc id 023747 rev 1 13/25 6 detailed description 6.1 swire protocol: to digitally communicate over a single cable with single-wire components 3 components of the single-wire: 1. an external mcu 2. wiring and associated connectors 3. the STOD13AM device with a dedicated single-wire pin. 6.1.1 swire features and benefits fully digital signal no handshake needed protection against glitches and spikes though an internal low pass filter acting on falling edges uses a single wire (plus analog ground) to accomplish both communication and power control transmission simplifies design with an interface protocol that supplies control and signaling over a single-wire connection to set the output voltages. 6.1.2 swire protocol single-wire protocol uses conventional cmos/ttl logic levels (maximum 0.6 v for logic ?zero? and a minimum 1.2 v for logic ?one?) with operation specified over a supply voltage range of 2.5 v to 4.5 v both master (mcu) and slave (STOD13AM) are configured to permit bit sequential data to flow only in one direction at a time; master initiates and controls the device data is bit-sequential with a start bit and a stop bit signal is transferred in real-time system clock is not required; each single-wire pulse is self-clocked by the oscillator integrated in the master and is asserted valid within a frequency range of 250 khz (maximum). 6.1.3 swire basic operations the negative output voltage levels are selectable within a wide range (steps of 100 mv) the device can be enabled / disabled via s wire in combination with the enable pin.
detailed description STOD13AM 14/25 doc id 023747 rev 1 6.2 negative output voltage levels 6.3 enable, swire and fd note: fd function is only controlled by the fd pin. it is not related to enable block. table 7. negative output voltage levels pulse v o2 pulse v o2 pulse v o2 1 -5.411-4.421-3.4 2 -5.312-4.322-3.3 3 -5.213-4.223-3.2 4 -5.114-4.124-3.1 5 -5.015-4.025-3.0 6 (1) 1. default value. -4.9 16 -3.9 26 -2.9 7 -4.817-3.827-2.8 8 -4.718-3.728-2.7 9 -4.619-3.629-2.6 10 -4.5 20 -3.5 30 -2.5 31 -2.4 table 8. enable and swire operation table (1) 1. the enable pin must be set to agnd while using the s wire function. enable swire action low low device off low high negative output set by s wire high low default negative output voltage high high default negative output voltage table 9. fast discharge operation table fd pin action low fast discharge active after ic shutdown high no fast discharge function
STOD13AM application information doc id 023747 rev 1 15/25 7 application information 7.1 external passive components 7.1.1 inductor selection magnetic shielded low esr power inductors must be chosen as the key passive components for switching converters. for the step-up converter an inductance between 4.7 h and 6.8 h is recommended. for the inverting stage the suggested inductance ranges from 3.3 h to 4.7 h. it is very important to select the right inductor according to the maximum current the inductor can handle to avoid saturation. the step-up and the inverting peak current can be calculated as follows: equation 1 equation 2 where v mid : step-up output voltage, fixed at 4.6 v; v o2 : inverting output voltage including sign (minimum value is the absolute maximum value); i o : output current for both dc-dc converters; v in : input voltage of the STOD13AM; f s : switching frequency. use the minimum value of 1.35 mhz for the worst case; 1: efficiency of step-up converter. typical value is 0.70; 2: efficiency of inverting converter. typical value is 0.60. the negative output voltage can be set via s wire at -5.4 v. accordingly, the inductor peak current, at the maximum load condition, increases. a proper inductor, with a saturation current as a minimum of 1 a, is preferred. 7.1.2 input and output capacitor selection it is recommended to use x5r or x7r low esr ceramic capacitors as input and output capacitors in order to filter any disturbance present in the input line and to obtain stable operation for the two switching converters. a minimum real capacitance value of 6 f must be guaranteed for c o2 in all conditions. considering tolerance, temperature variation and dc polarization, 2 x 10 f 10 v 10% as c o2 can be used to achieve the required 6 f. 1 l fs v 2 ) vin v ( vin vin 1 i v i mid min mid min min out mid boost peak ? + = ? 2 ) 2 ( 2 2 2 ) 2 ( l fs vin vo vo vin vin i vo vin i min min min min min out min min inverting peak x x - x x + x x - = - 2 ) 2 ( 2 2 2 ) 2 ( l fs vin vo vo vin vin i vo vin i min min min min min out min min inverting peak x x - x x + x x - = -
application information STOD13AM 16/25 doc id 023747 rev 1 7.2 recommended pcb layout the STOD13AM is a high frequency power switching device and therefore requires a proper pcb layout in order to obtain the necessary stability and optimize line/load regulation and output voltage ripple. analog input (v ina ) and power input (v inp ) must be kept separated and connected together at the c in pad only. the input capacitor must be as close as possible to the ic. in order to minimize the ground noise, a common ground node for power ground and a different one for analog ground must be used. in the recommended layout, the agnd node is placed close to c ref ground while the pgnd node is centered at c in ground. they are connected by a separated layer routing on the bottom through vias. the exposed pad is connected to agnd through vias. figure 12. top layer and silk-screen (top view, not to scale) figure 13. bottom layer and silk-screen (top view, not to scale)
STOD13AM detailed description doc id 023747 rev 1 17/25 8 detailed description 8.1 general description the STOD13AM is a high efficiency dual dc-dc converter which integrates a step-up and inverting power stage suitable for supplying amoled panels. thanks to the high level of integration it needs only 6 external components to operate and it achieves very high efficiency using a synchronous rectification technique for each of the two dc-dc converters. the controller uses an average current mode technique in order to obtain good stability and precise voltage regulation in all possible conditions of input voltage, output voltage, and output current. in addition, the peak inductor current is monitored in order to avoid saturation of the coils. the STOD13AM implements a power saving technique in order to maintain high efficiency at very light load and it switches to pwm operation as the load increases in order to guarantee the best dynamic performance and low noise operation. the STOD13AM avoids battery leakage thanks to the true-shutdown feature and it is self protected from overtemperature. undervoltage lockout and soft-start guarantee proper operation during startup. 8.1.1 multiple operation modes both the step-up and the inverting stage of the STOD13AM operate in three different modes: pulse-skipping (psm), discontinuous conduction mode (dcm) and continuous conduction mode (ccm). it switches automatically between the three modes according to input voltage, output current, and output voltage conditions. 8.1.2 pulse-skipping operation the STOD13AM works in pulse-skipping mode when the load current is below a few ma. the load current level at which this way of operation occurs depends on input voltage only for the step-up converter and on input voltage and negative output voltage (v o2 ) for the inverting converter. 8.1.3 discontinuous conduction mode when the load increases above a few ma, the STOD13AM enters dcm operation. in order to obtain this type of operation the controller must avoid the inductor current going negative. the discontinuous mode detector (dmd) blocks sense the voltage across the synchronous rectifiers (p1b for the step-up and n2 for the inverting) and turn off the switches when the voltage crosses a defined threshold which, in turn, represents a certain current in the inductor. this current can vary according to the slope of the inductor current which depends on input voltage, inductance value, and output voltage. 8.1.4 continuous conduction mode at medium/high output loads, the STOD13AM enters full ccm at constant switching frequency mode for each of the two dc-dc converters.
detailed description STOD13AM 18/25 doc id 023747 rev 1 8.1.5 enable pin the device operates when the en pin is set high. if the en pin is set low, the device stops switching, and all the internal blocks are turned off. in this condition the current drawn from v inp /v ina is below 1 a in the whole temperature range. in addition, the internal switches are in an off state so the load is electrically disconnected from the input; this avoids unwanted current leakage from the input to the load. 8.1.6 soft-start and inrush current limiting after the en pin is pulled high, or after a suitable voltage is applied to v inp , v ina and en, the device initiates the start-up phase. as a first step, the c mid capacitor is charged and the p1b switch implements a current limiting technique in order to keep the charge current below 400 ma. this avoids the battery overloading during startup. after v mid reaches the v inp voltage level, the p1b switch is fully turned on and the soft-start procedure for the step-up is started. after around 2 ms the soft-start for the inverting is started. the positive and negative voltages are under regulation at around 13 ms after the en pin is asserted high. 8.1.7 undervoltage lockout the undervoltage lockout function avoids improper operation of the STOD13AM when the input voltage is not high enough. when the input voltage is below the uvlo threshold the device is in shutdown mode. the hysteresis of 50 mv avoids unstable operation when the input voltage is close to the uvlo threshold. 8.1.8 overtemperature protection an internal temperature sensor continuously monitors the ic junction temperature. if the ic temperature exceeds 140 c, typical, the device stops operating. as soon as the temperature falls below 125 c, typical, normal operation is restored. 8.1.9 short-circui t protection during soft-start (ssd) during device soft-start on the positive output, an internal comparator checks if the panel is damaged. in this case, soft-start is stopped and the device is parked in power-off. to reset the normal functionality (assuming that the anomalous load condition is removed), it is necessary to restart the converter through an enable transient. if the panel is not damaged it is possible to proceed with the soft-start of the negative output and both reach their final value, therefore ensuring normal output voltages and functionality. 8.1.10 overload protection (olp) the output current is internally limited. an overload condition, as a short-circuit between the two outputs or between each output and gnd, produces the device power-off. to reset the normal functionality (assuming that the short condition is removed), it is necessary to restart the converter through an enable transient.
STOD13AM detailed description doc id 023747 rev 1 19/25 8.1.11 short-circui t protection (scp) when short-circuit occurs, the device is able to detect the voltage difference between v in and v out . overshoots are limited, decreasing the inductor current. after that, the output stages of the device are turned off. this status is maintained, avoiding current flowing to the load. a new enable transition is needed to restart the device. during startup the short- circuit protection is active. 8.1.12 fast discharge when enable turns from high to low level, the device goes into shutdown mode and lx1 and lx2 stop switching. if the fd pin is low, a resistor of about 400 is connected between v mid and v o2 to discharge quickly c mid and c o2 capacitors, lowering by about 10 ms the differential output voltage (v mid -v o2 ) below 10% of nominal value. when the output voltages are discharged to 0 v, the switches turn off and the outputs are high impedance. when the fd pin is high, the fast discharge after shutdown is off.
package mechanical data STOD13AM 20/25 doc id 023747 rev 1 9 package mechanical data in order to meet environmental requirements, st offers these devices in different grades of ecopack ? packages, depending on their level of environmental compliance. ecopack specifications, grade definitions and product status are available at: www.st.com . ecopack is an st trademark.
STOD13AM package mechanical data doc id 023747 rev 1 21/25 figure 14. dfn12l (3 x 3) drawing table 10. dfn12l (3 x 3) mechanical data dim. mm inch min. typ. max. min. typ. typ. a 0.51 0.55 0.60 0.020 0.022 0.024 a1 0 0.02 0.05 0 0.001 0.002 a3 0.20 0.008 b 0.18 0.25 0.30 0.007 0.010 0.012 d 2.85 3 3.15 0.112 0.118 0.124 d2 1.87 2.02 2.12 0.074 0.080 0.083 e 2.85 3 3.15 0.112 0.118 0.124 e2 1.06 1.21 1.31 0.042 0.048 0.052 e 0.45 0.018 l 0.30 0.40 0.50 0.012 0.016 0.020 8 0 8 5116_a
package mechanical data STOD13AM 22/25 doc id 023747 rev 1 dim. mm. inch min. typ max. min. typ. max. a 33 0 12. 99 2 c 12. 8 1 3 .2 0.504 0.51 9 d 20.2 0.7 9 5 n 99 101 3 . 898 3 . 9 76 t 14.4 0.567 ao 3 . 3 0.1 3 0 bo 3 . 3 0.1 3 0 ko 1.1 0.04 3 po 4 0.157 p 8 0. 3 15 tape & reel qfnxx/dfnxx ( 3 x 3 ) mechanical data
STOD13AM package mechanical data doc id 023747 rev 1 23/25 figure 15. dfn12l (3 x 3 mm) footprint recommended data (millimeters)
revision history STOD13AM 24/25 doc id 023747 rev 1 10 revision history table 11. document revision history date revision changes 02-oct-2012 1 initial release.
STOD13AM doc id 023747 rev 1 25/25 please read carefully: information in this document is provided solely in connection with st products. stmicroelectronics nv and its subsidiaries (?st ?) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described he rein at any time, without notice. all st products are sold pursuant to st?s terms and conditions of sale. purchasers are solely responsible for the choice, selection and use of the st products and services described herein, and st as sumes no liability whatsoever relating to the choice, selection or use of the st products and services described herein. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. i f any part of this document refers to any third party products or services it shall not be deemed a license grant by st for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoev er of such third party products or services or any intellectual property contained therein. unless otherwise set forth in st?s terms and conditions of sale st disclaims any express or implied warranty with respect to the use and/or sale of st products including without limitation implied warranties of merchantability, fitness for a particular purpose (and their equivalents under the laws of any jurisdiction), or infringement of any patent, copyright or other intellectual property right. unless expressly approved in writing by two authorized st representatives, st products are not recommended, authorized or warranted for use in military, air craft, space, life saving, or life sustaining applications, nor in products or systems where failure or malfunction may result in personal injury, death, or severe property or environmental damage. st products which are not specified as "automotive grade" may only be used in automotive applications at user?s own risk. resale of st products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by st for the st product or service described herein and shall not create or extend in any manner whatsoev er, any liability of st. st and the st logo are trademarks or register ed trademarks of st in various countries. information in this document supersedes and replaces all information previously supplied. the st logo is a registered trademark of stmicroelectronics. all other names are the property of their respective owners. ? 2012 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - philippines - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com

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