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ds04-27211-3e fujitsu semiconductor data sheet assp for power supply applications bipolar switching regulator controller (supporting external synchronization) MB3789 n description the MB3789 is a pwm (pulse width modulation) switching regulator controller supporting an external sync signal. the MB3789 incorporates two error amplifiers which can be used respectively for voltage control and current control, allowing the ic to serve as a dc/dc converter with current regulating functions. the MB3789 is the ideal ic for supplying power to the back-lighting fluorescent tube for a liquid crystal display (lcd) device such as a camera-integrated vtr. n features ? wide range of operating power supply voltages: 3 v to 18 v ? low current consumption: 1.5 ma (typ.) ? wide input voltage range of error amplifier: C0.2 v to v cc C 1.8 v ? built-in two error amplifier ? oscillator capable of operating with an external sync signal ? built-in timer latch short protection circuit ? variable dead time provides control over total operating range ? output supporting a power mosfet ? 16-pin ssop package mountable at high density n pac k ag e 16-pin plastic ssop (fpt-16p-m05)
2 MB3789 n pin assignment 16 15 14 13 12 11 10 9 gnd out v cc 2 cb dtc fb2 - in2 + in2 1 2 3 4 5 6 7 8 v cc 1 v ref c t sync scp fb1 - in1 + in1 (fpt-16p-m05) (top view) *1 *1 *1 *2 *2 *2 *1: pins on error amplifier 1 *2: pins on error amplifier 2
3 MB3789 n pin description pin no. pin symbol i/o function 7 Cin1 i error amplifier 1 inverting input pin 8 +in1 i error amplifier 1 noninverting input pin 6 fb1 o error amplifier 1 output pin 10 Cin2 i error amplifier 2 inverting input pin 9 +in2 i error amplifier 2 noninverting input pin 11 fb2 o error amplifier 2 output pin 13 cb output bootstrap pin. connect a capacitor between the cb and out pins to bootstrap the output transistor. 5 scp capacitor connection pin for short-circuit protection circuit 12 dtc i dead time control pin 15 out o totem-pole output pin 3c t sawtooth waveform frequency setting capacitor/resistor connection pin 4 sync i external sync signal input pin 1v cc 1 reference power supply, control circuit power-supply pin 14 v cc 2 output circuit power-supply pin 2v ref o reference voltage output pin 16 gnd ground pin i/o control unit sawtooth waveform oscillator power-supply circuit
4 MB3789 n block diagram v ref scp comparator 3 - 0.9 v - 0.3 v 8 7 6 9 10 11 12 13 14 15 cb v cc 2 out 10 k w 3 4 5 16 2 1 1.25 v 1.8 v 1.1 v 1.25 v 8 m a 2 m a 4 m a c t sync scp gnd +in1 - in1 fb1 +in2 - in2 fb2 dtc v cc 1 v ref error amp. 1 pwm comparator scp comparator 1 scp comparator 2 reference voltage supply power on/off circuit sr latch external sync signal under voltage lock-out protection circuit sawtooth wave oscillator error amp. 2
5 MB3789 n functional description 1. switching regulator functions (1) reference voltage generator the reference voltage generator uses the voltage supplied from the power supply pin (pin 1) to generate a temperature-compensated, reference voltage (about 2.50 v) as the reference supply voltage for the ics internal circuitry. the reference voltage can be output, up to 50 m a, to an external device through the v ref pin (pin 2). this regulated reference voltage can be used as the reference voltage for the switching regulator and also used for setting the dead time. (2) sawtooth waveform oscillator with a timing capacitor and a timing resistor connected to the c t pin (pin 3), the sawtooth waveform oscillator generates a sawtooth wave which remains stable even with supply voltage variations or temperature changes. the sawtooth wave is input to the pwm comparator. the amplitude of oscillating waveform is 0.3 v to 0.9 v. in addition, the oscillator can be used for external synchronization, where it generates a sawtooth waveform synchronous to the input signal from the sync pin (pin 4). (3) error amplifiers the error amplifiers detect the output voltage from the switching regulator and outputs the pwm control signal. since they support a wide range of in-phase input voltages from C0.2 v to v cc C 1.8 v, they can be set easily from an external power supply. an arbitrary loop gain can be set by connecting a feedback resistor and capacitor from the error amplifier output pin to the inverting input pin, enabling stable phase compensation to the system. the MB3789 can make a current-regulated dc/dc converter using the two internal error amplifiers respectively for voltage control and current control. (4) pwm comparator the pwm comparator is a voltage comparator with one inverting input and three noninverting inputs, serving as a voltage-pulse width converter for controlling the output duty depending on the input voltage. the pwm comparator turns on the output transistor during the interval in which the sawtooth wave voltage level is lower than the voltage levels at all of the error amplifier output pins, the scp pin (pin 5), and at the dtc pin (pin 12). (5) output circuit the output circuit is a power mosfet driven, output circuit in a totem-pole configuration. it can drive the gate voltage up to near the supply voltage with a bootstrap capacitor connected between the out pin (pin 15) and cb pin (pin 13). (see n setting the bootstrap capacitor (c bs ).) 2. protection functions (1) timer-latch short-circuit protection circuit scp comparator 1 detects the output voltage levels of error amplifiers 1 and 2. when the output voltage level of either (or both) of the two error amplifiers reaches 1.25 v, the timer circuit is actuated to start charging the external protection-enable capacitor connected to the scp pin (pin 5). if the error amplifier output is not restored to the normal voltage level before the capacitor voltage reaches 1.8 v, the latch circuit is actuated to turn off the output transistor while making the dead time 100%. to reset the actuated protection circuit, turn the power supply on back. (see n setting the soft start/ short-circuit detection time.)
6 MB3789 (2) low input voltage malfunction preventive circuit the transient state or a momentary decrease in supply voltage, which occurs when the power supply is turned on, may cause errors in the control ic, resulting in breakdown or degradation of the system. the low input voltage malfunction preventive circuit detects the internal reference voltage level according to the supply voltage level and, if the input voltage is low, turn off the output transistor and maintains the scp pin (pin 5) at 0 v while making the dead time 100%. the circuit restores voltage supply when the supply voltage reaches its threshold voltage.
7 MB3789 n absolute maximum ratings (ta = +25 c) * : when mounted on a 10 cm-square double-side epoxy board. warning: semiconductor devices can be permanently damaged by application of stress (voltage, current, temperature, etc.) in excess of absolute maximum ratings. do not exceed these ratings. n recommended operating conditions (ta = +25 c) warning: the recommended operating conditions are required in order to ensure the normal operation of the semiconductor device. all of the devices electrical characteristics are warranted when the device is operated within these ranges. always use semiconductor devices within their recommended operating condition ranges. operation outside these ranges may adversely affect reliability and could result in device failure. no warranty is made with respect to uses, operating conditions, or combinations not represented on the data sheet. users considering application outside the listed conditions are advised to contact their fujitsu representatives beforehand. parameter symbol condition rating unit min. max. power supply voltage v cc 20v power dissipation p d ta +25 c 440*mw operating temperature top C30 +85 c storage temperature tstg C55 +125 c parameter symbol condition value unit min. typ. max. power supply voltage v cc 1 3.0 5.0 18 v v cc 26.018v reference voltage output current i or C50 C30 m a error amp. input voltage v i C0.2 v cc C 1.8 v output current i o+ cb = 4700 pf, t 2 m s C70 C40 ma i oC cb = 4700 pf, t 2 m s 4070ma timing resistance r t 10 39 200 k w timing capacitance c t 470 1000 6800 pf oscillation frequency f osc 1 20 200 khz operating temperature t op C30+25+85 c
8 MB3789 n electrical characteristics (v cc 1 = 5 v, v cc 2 = 6 v, ta = +25 c) * : standard design value (continued) parameter symbol condition value unit min. typ. max. reference voltage block output voltage v ref i or = 0 m a 2.400 2.500 2.600 v output voltage temperature variation d v ref /v ref ta = C30 c to +85 c* 0.2 2 % input stability line v cc = 3.0 v to 18 v 1 10 mv load stability load i or = 0 m a to C50 m a 2 10mv short output current i os v ref = 0 v C700 C450 C300 m a under voltage lockout protection circuit threshold voltage v th 2.15 2.62 v v tl 1.621.90v hysteresis width v hys 80 250 mv reset voltage (v cc )v r 1.01.4v soft start block charge current i chg v scp 0.9 v C2.8 C2.0 C1.2 m a threshold voltage v t0 duty cycle = 0% 0.2 0.3 0.4 v v t100 duty cycle = 100% 0.8 0.9 1.0 v short circuit detection block threshold voltage v th 1.701.801.90v input standby voltage v stb 1.151.251.35mv input latch voltage v i 50 100 mv input source current i i v scp = 1.5 v C8.4 C6.0 C3.6 m a triangular waveform oscillator block oscillator frequency f osc c t = 1000 pf, r t = 39 k w 17 20 23 khz frequency voltage variation d f/f dv v cc = 3 v to 18 v 1 10 % frequency temperature variation d f/f dt ta = C30 c to +85 c* 3 % synchronous pin input current i sync v thsy = 5 v 0.9 1.3 2.2 ma synchronous pin threshold voltage v thsy 0.650.750.85v
9 MB3789 (continued) (v cc 1 = 5 v, v cc 2 = 6 v, ta = +25 c) * : standard design value parameter symbol condition value unit min. typ. max. error amplifier input offset voltage v io v fb = 0.6 v 10 mv input offset current i io v fb = 0.6 v 100 na input bias current i b v fb = 0.6 v C200 C30 na common mode input voltage range v cm C0.2 v cc C 0.8 v common mode rejection ratio c mrr 60 100 db voltage gain a v 60 100 db frequency bandwidth bw a v = 0 db* 800 khz maximum output voltage range v om+ v ref C 0.3 2.4 v v omC 0.05 0.3 v output sink current i om+ v fb = 0.6 v 30 60 m a output source current i omC v fb = 0.6 v C2 C0.6 ma dead time control block threshold voltage v t0 duty cycle = 0% 0.2 0.3 0.4 v v t100 duty cycle = 100% 0.8 0.9 1.0 v on duty cycle dtr v dt = v ref /4.2 45 55 65 % input bias current i ibdt C500 C100 na pwm comparator block threshold voltage v t0 duty cycle = 0% 0.2 0.3 0.4 v v t100 duty cycle = 100% 0.8 0.9 1.0 v input sink current i in+ 3060 m a input source current i inC C2 C0.6 ma output block output voltage v oh cl = 2000 pf, cb = 4700 pf 5.5 6.0 v v ol cl = 2000 pf, cb = 4700 pf 1.11.4v general power supply current when output off i cc 1 1.15 1.65 ma i cc 2 350 500 m a
10 MB3789 n typical characteristics (continued) output power supply current i cc 1 ( m a) 2.4 2.0 1.6 1.2 0.8 0.4 0 0 4 8 12 16 20 v cc 2 = 6 v ta = +25 c power supply voltage v cc 1 (v) power supply voltage v cc 1 (v) power supply voltage v cc 2 (v) ambient temperature ta ( c) timing resistance r t ( w ) timing capacitance c t (pf) output power supply current vs. power supply voltage characteristics reference voltage vs. ambient temperature characteristics sawtooth wave frequency vs. timing resistance characteristics (with c t /r t oscillation) sawtooth waveform maximum amplitude voltage vs. timing capacitance characteristics (with c t /r t oscillation) power supply current vs. power supply voltage characteristics reference voltage vs. power supply voltage characteristics power supply current i cc 1 (ma) reference voltage v ref (v) reference voltage v ref (v) sawtooth wave frequency f (hz) sawtooth waveform maximum amplitude voltage v ct (v) 500 400 300 200 100 0 0 4 8 12 16 20 v cc 1 = 5 v ta = +25 c 5.0 4.0 3.0 2.0 1.0 0 0 4 8 12 16 20 v cc 2 = 6 v i or = 0 m a ta = +25 c 2.56 2.54 2.52 2.50 2.48 2.46 2.44 - 40 0 20 40 80 - 20 60 100 v cc 1 = 5 v v cc 2 = 6 v i or = 0 m a 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 10 5 10 10 223 5 10 10 34 5 10 4 2 k 5 k 10 k 50 k 100 k 500 k 1 m 500 k 100 k 50 k 10 k 5 k 1 k 500 100 v cc 1 = 5 v c t = 470 pf c t = 1500 pf c t = 4700 pf c t = 6800 pf v cc 2 = 6 v sync = gnd ta = +25 c sync = gnd v cc 1 = 5 v v cc 2 = 6 v r t = 39 k w ta = +25 c
11 MB3789 (continued) 500 100 50 10 5 2 10 5 10 10 23 5 10 10 34 5 10 4 2 10 5 10 2 100 500 k 100 k 50 k 10 k 5 k 1 k 500 200 80 60 40 20 0 - 40 +10 +5 0 - 10 - 5 - 200 20406080100 +10 +5 0 - 5 10 - 40 - 20 0 20 40 60 80 100 10 m 100 k 1 m 10 k 1 k 40 20 0 - 20 - 40 180 90 0 - 90 - 180 av f 240 k w out error amp. 4.7 k w 10 m f in 2.5 v 2.5 v 4.7 k w 4.7 k w 4.7 k w sync = gnd v cc 1 = 5 v v cc 2 = 6 v r t = 39 k w ta = +25 c ta = +25 c v cc 1 = 5 v v cc 2 = 6 v r t = 39 k w c t = variable v cc 1 = 5 v v cc 2 = 6 v v dt = 0.6 v sync = gnd ta = - 25 c r t = 39 k w c t = 1500pf sync = gnd v cc 1 = 5 v v cc 2 = 6 v r t = 43 k w c t = 1500pf f sync = 15.0 khz v cc 1 = 5 v v cc 2 = 6 v duty vs. sawtooth wave frequency characteristics (with c t /r t oscillation) sawtooth waveform period vs. timing capacitance characteristics (with c t /r t oscillation) sawtooth wave frequency vs. ambient temperature characteristics (with c t /r t oscillation) gain vs. frequency and phase vs. frequency characteristics measurement circuit for gain-frequency characteristics and phase-frequency characteristics sawtooth wave frequency vs. ambient temperature characteristics (in external synchronization) sawtooth wave frequency f (hz) timing capacitance c t (pf) ambient temperature ta ( c) frequency f (hz) duty (%) sawtooth waveform period t ( m s) frequency regulation d f/f (%) gain a v (db) phase f (deg) ambient temperature ta ( c) frequency regulation d f/f (%)
12 MB3789 (continued) 04 100 50 0 - 50 - 100 8121620 6 4 2 0 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 100 80 60 40 20 0 time t ( m s) 500 400 440 - 30 - 20 0 20 40 60 80 100 300 100 0 200 power comsumption vs. ambient temperature characteristics duty vs. dtc pin voltage characteristics output pin (out) voltage and current waveforms ambient temperature ta ( c) dtc pin voltage vdt (v) power comsumption p d (mw) duty (%) output current i o (ma) output voltage v out (v) r t = 39 k w c t = 1500 pf sync = gnd v cc 1 = 5 v v cc 2 = 6 v v cc 1 = 5 v, v cc 2 = 6 v
13 MB3789 n setting the output voltage set the output voltage by connecting the input pins (+in, Cin) and output pin (fb) of error amplifiers 1 and 2 as shown in figures 1 and 2. r1 r r2 r v ref v out (r1 + r2) 2 r 2 + v out + = v ref r nf r1 r r2 r v ref r nf (r1 + r2) + v ref 2 r 1 v ref v out - v out - = - figure 1 setting the output voltage (positive output voltage (v out )) figure 2 setting the output voltage (negative output voltage (v out ))
14 MB3789 n connection for output control with one error amplifier the MB3789 can make up a system using only one of the two error amplifiers. in this case, connect the +in and Cin pins of the unused error amplifier to the v ref and gnd pins, respectively, and leave the fb pin open. when v cc C 1.8 v < v ref , divide the v ref voltage using a resistor and apply the voltage to the +in pin. v ref +in1 - in1 fb1 6 7 8 2 open v ref +in2 - in2 fb2 open 11 10 9 2 figure 1 connection without using error amplifier 1 figure 2 connection without using error amplifier 2
15 MB3789 n connecting the sawtooth waveform oscillator 1. connection for internal oscillation for internal oscillation, connect the frequency setting capacitor (c t ) and resistor (r t ) to the c t pin (pin 3) and leave the sync pin (pin 4) open or connect it to gnd. the oscillation frequency can be set with the c t and r t constants. 2. connection for external synchronous oscillation for external synchronous oscillation, connect the frequency setting capacitor (c t ) and resistor (r t ) to the c t pin (pin 3) and connect the external sync signal to the sync pin (pin 4). in this case, select the c t and r t conditions so that the oscillation frequency is 5% to 10% lower than the frequency of the external sync signal excluding the setting error of the oscillation frequency. sync c t 3 4 c t r t leave open or connect to gnd figure 5 connection for internal oscillation sync external sync signal c t 3 4 c t r t figure 6 connection for external synchronous oscillation
16 MB3789 n setting the dead time when the device is set for step-up inverting output based on the flyback method, the output transistor is fixed to a full-on state (on duty = 100%) when the power supply is turned on. to prevent this problem, you may determine the voltage at the dtc pin (pin 12) from the v ref voltage so you can set the output transistors dead time (maximum on-duty period) as shown in figure 7 below. 1. setting the dead time when setting the dead time, use resistors as shown in figure 7 to connect the v ref and dtc pins to gnd. when the voltage at the dtc pin (pin 12) is lower than the sawtooth wave output voltage from the oscillator, the output transistor is turned off. to set the dead time, see duty vs. dtc pin voltage (in n standard characteristic curves). 2. connection without setting the dead time if you do not set the dead time, connect the v ref and dtc pins as shown in figure 8. v dt = v ref r2 r1 + r2 2 r2 v dt 12 dtc v ref r1 2 12 dtc v ref figure 7 connection for setting the dead time figure 8 connection without setting the dead time
17 MB3789 n setting the soft start/short-circuit detection time connecting capacitor c pe to the scp pin (pin 5) as shown in figure 9 enables a soft start and short-circuit protection. 5 1.25 v 2 m a 1.25 v 8 m a4 m a v ref output off scp c pe 1.8 v 1.1 v scp comparator 1 scp comparator 2 scp comparator 3 sr latch low input voltage protection circuit 0% 50% soft start scp pin voltage (v) time t (s) output short-circuit output short-circuit 100% t s 1.25 v 1.8 v t pe 0 1 2 figure 9 soft start/short-circuit detection circuit figure 10 scp pin operating waveform
18 MB3789 1. soft start to prevent surge currents when the ic is turned on, you can set a soft start by connecting capacitor c pe to the scp pin (pin 5). ? softstart time(ts): time required up to duty cycle 50% with output on t s (s) 0.15 c pe ( m f) 2. protection from short circuit scp comparator 1 always compares the output voltage levels at error amplifiers 1 and 2 with the 1.25 v reference voltage. when the load conditions for the switching regulator are stable, the outputs from error amplifiers 1 and 2 do not vary and thus short-circuit protection control remains balanced. in this case, the scp pin (pin 5) is held at the soft start end voltage (about 1.25 v). if the load conditions change rapidly and the output voltage of error amplifier 1 or 2 reaches 1.25 v, for example, because of a short-circuit of a load, capacitor c pe is charged further. when capacitor c pe is charged up to about 1.8 v, the sr latch is set and the output drive transistor is turned off. at this time, the dead time is set to 100%, capacitor c pe is discharged, and the scp pin becomes 50 mv. ? short-circuit detection time (t pe ) t pe (s) 0.09 c pe ( m f) 3. connection without using short-circuit protection add a clamp circuit as shown in figure 11 so that the clamp voltage (v crp ) falls within the following range when a short-circuit is detected: 1.0 v < v crp < 1.7 v ~ ~ ~ ~ 5 v crp c pe scp clamp circuit figure 11 connection without using short-circuit protection
19 MB3789 n setting the bootstrap capacitor when a bootstrap capacitor is connected, it raises the output-on voltage (at the out pin (pin 15) when the external mos fet is turned on) to the v cc 2 level. it can therefore drive the mos fet at a higher threshold voltage (v th ). 1. connecting the bootstrap capacitor connect the bootstrap capacitor between the cb pin (pin 13) and out pin (pin 15). ? calculation of bootstrap capacitance t on (max): maximum on duty time ~ cb out 10 k w v cc 2 v cc 2 v cc 1 v cbs v out c bs external mos fet : charge current i c : discharge current i d i i d i c 13 14 15 figure 12 circuit with a bootstrap capacitor connected and current flow 500 10 6 v cc 2 C 2.6 c bs t on (max) [pf]
20 MB3789 2. connection with no bootstrap capacitor connect the cb pin (pin 13) and v cc 2 pin (pin 14) as shown in figure 13. v cc 2 external mos fet note: under a condition of v cc 2 - v th < 1.1 v, bootstrap capacitor c bs should be connected because 13 14 15 cb v cc 2 out v th : external mos fet threshold voltage the external mos fet cannot be driven sufficiently. figure 13 connection with no bootstrap capacitor connected
21 MB3789 3. operation of the bootstrap capacitor when voltage v out at the out pin (pin 15) is l level, the voltages (v c1 ) at both ends of the bootstrap capacitor c bs is charged up to the v cc 2 voltage level by charge current (i c ). when v out changes from l level to h level, the cb pin (pin 13) voltage v cbs rises to 2 v cc 2 and v out reaches almost the v cc 2 level. the charge accumulated at c bs at this time is released by discharge current i d (output unit supply current). see figure 12 for circuit operation. ~ 12 10 8 6 4 2 0 6 4 2 0 0 20406080100 t on t off 2 v 2 v 10 m s *2 out pin voltage v out (v) cb pin voltage v cbs (v) time t ( m s) (v cc 1 = 5 v, v cc 2 = 6 v, c bs = 4700 pf) v cbs *1 v out *1: use the device with a setting of v cbs 18 v. *2: the slant of v cbs is determined by the value of discharge current i d (output unit supply current). figure 14 bootstrap operating waveform
22 MB3789 n equivalent series resistance of smoothing capacitor and system stability the equivalent series resistance (esr) value of a smoothing capacitor for the dc/dc converter largely affects the loop phase characteristic. depending on the esr value, the phase characteristic causes the ideal capacitor in a high-frequency domain advance the loop phase (as shown in figures 16 and 17) and thus the system is improved in stability. in contrast, using a smoothing capacitor with low esr lowers system stability. use meticulous care when a semiconductor electrolytic capacitor with low esr (such as an os capacitor) or a tantalum capacitor is used. (the next page gives an example of reduction in phase margin when an os capacitor is used.) r c v in d rl c tr l 20 0 - 20 - 40 - 60 10 (1) : r c = 0 w (2) : r c = 31 m w 100 1 k 10 k 100 k gain (db) frequency f (hz) (1) (2) 0 - 90 - 180 10 100 1 k 10 k 100 k (1) : r c = 0 w (2) : r c = 31 m w phase (deg) frequency f (hz) (1) (2) figure 15 basic circuit of step-down dc/dc converter figure 16 gain vs. frequency figure 17 phase vs. frequency
23 MB3789 (reference data) changing the smoothing capacitor from an aluminum electrolytic capacitor (r c 1.0 w ) to a low-esr semiconductor electrolytic capacitor (os capacitor: r c 0.2 w ) halves the phase margin. (see figures 19 and 20.) ~ ~ +in - in r 1 v in v ref /2 r 2 fb c nf v out a v -phase characteristic in this range v o + error amplifier gnd ai electrolytic capacit 220 m f (16 v) r c 1.0 w : f osc = 1 khz 60 40 20 0 - 20 - 40 10 100 1 k 10 k 100 k 180 90 0 - 90 - 180 a v 62 gain (db) frequency f (hz) ft v cc = 10 v r l = 25 w c p = 0.1 m f phase (deg) v o + figure 18 dc/dc converter av vs. phase measurement diagram figure 19 gain vs. frequency ai electrolytic capacitor gain vs. frequency, phase vs. frequency (dc/dc converter +5 v output)
24 MB3789 gnd 60 40 20 0 - 20 - 40 10 100 1 k 10 k 100 k 180 90 0 - 90 - 180 a v gain (db) frequency f (hz) phase (deg) 27 ft v cc = 10 v r l = 25 w c p = 0.1 m f v o + os capacitor 22 m f (16 v) r c 0.2 w : f osc = 1 khz figure 20 phase vs. frequency characteristic curves os capacitor gain vs. frequency, phase vs. frequency (dc/dc converter +5 v output)
25 MB3789 n application example 1 2 7 8 6 9 10 11 12 4 3 5 16 15 13 14 (5 v) cb out gnd scp c t sync dtc fb2 - in2 +in2 fb1 - in1 +in1 v ref v cc 1 v cc 10 m f 10 m f 1 m f 39 w 22 k w 10 m h v cc 2 33 pf 1500 pf 4.7 m f 33 k w 18 k w 100 k w 100 k w 100 k w 150 k w 100 k w 100 k w 100 k w 4.7 k w synchronous signal 150 k w 10 k w 2.7 k w 4700 pf back light MB3789
26 MB3789 n usage precautions 1. do not input voltages greater than the maximum rating. inputting voltages greater than the maximum rating may damage the device. 2. always use the device under recommended operating conditions. if a voltage greater than the maximum value is input to the device, its electrical characteristics may not be guaranteed. similarly, inputting a voltage below the minimum value may cause device operation to become unstable. 3. for grounding the printed circuit board, use as wide ground lines as possible to prevent high-frequency noise. because the device uses high frequencies, it tends to generate high-frequency noise. 4. take the following measures for protection against static charge: ? for containing semiconductor devices, use an antistatic or conductive container. ? when storing or transporting device-mounted circuit boards, use a conductive bag or container. ? ground the workbenches, tools, and measuring equipment to earth. ? make sure that operators wear wrist straps or other appropriate fittings grounded to earth via a resistance of 250 k to 1 m w placed in series between the human body and earth. n ordering information part number package remarks MB3789pfv 16-pin plastic ssop (fpt-16p-m05)
27 MB3789 n package dimension 16-pin plastic ssop (fpt-16p-m05) +0.20 C0.10 +.008 C.004 +0.10 C0.05 +.004 C.002 +0.05 C0.02 +.002 C.001 index "a" 0.10(.004) 1.25 .049 0.22 .009 0.15 .006 (.0256.0047) * (.173.004) (.252.008) nom 6.400.20 4.400.10 5.40(.213) 0.650.12 * 5.000.10(.197.004) 4.55(.179)ref details of "a" part 0 10 (stand off) 0.100.10(.004.004) (.020.008) 0.500.20 1994 fujitsu limited f16013s-2c-4 c dimensions in mm (inches) (mounting height) *: these dimensions do not include resin protrusion.
28 MB3789 fujitsu limited for further information please contact: japan fujitsu limited corporate global business support division electronic devices kawasaki plant, 4-1-1, kamikodanaka nakahara-ku, kawasaki-shi kanagawa 211-8588, japan tel: 81(44) 754-3763 fax: 81(44) 754-3329 http://www.fujitsu.co.jp/ north and south america fujitsu microelectronics, inc. semiconductor division 3545 north first street san jose, ca 95134-1804, usa tel: (408) 922-9000 fax: (408) 922-9179 customer response center mon. - fri.: 7 am - 5 pm (pst) tel: (800) 866-8608 fax: (408) 922-9179 http://www.fujitsumicro.com/ europe fujitsu mikroelektronik gmbh am siebenstein 6-10 d-63303 dreieich-buchschlag germany tel: (06103) 690-0 fax: (06103) 690-122 http://www.fujitsu-ede.com/ asia pacific fujitsu microelectronics asia pte ltd #05-08, 151 lorong chuan new tech park singapore 556741 tel: (65) 281-0770 fax: (65) 281-0220 http://www.fmap.com.sg/ f9906 ? fujitsu limited printed in japan all rights reserved. the contents of this document are subject to change without notice. customers are advised to consult with fujitsu sales representatives before ordering. the information and circuit diagrams in this document are presented as examples of semiconductor device applications, and are not intended to be incorporated in devices for actual use. also, fujitsu is unable to assume responsibility for infringement of any patent rights or other rights of third parties arising from the use of this information or circuit diagrams. fujitsu semiconductor devices are intended for use in standard applications (computers, office automation and other office equipment, industrial, communications, and measurement equipment, personal or household devices, etc.). caution: customers considering the use of our products in special applications where failure or abnormal operation may directly affect human lives or cause physical injury or property damage, or where extremely high levels of reliability are demanded (such as aerospace systems, atomic energy controls, sea floor repeaters, vehicle operating controls, medical devices for life support, etc.) are requested to consult with fujitsu sales representatives before such use. the company will not be responsible for damages arising from such use without prior approval. any semiconductor devices have an inherent chance of failure. you must protect against injury, damage or loss from such failures by incorporating safety design measures into your facility and equipment such as redundancy, fire protection, and prevention of over-current levels and other abnormal operating conditions. if any products described in this document represent goods or technologies subject to certain restrictions on export under the foreign exchange and foreign trade law of japan, the prior authorization by japanese government will be required for export of those products from japan.

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