tcm850 TCM851 tcm852 tcm853 tc850/1/2/3-3 10/1/96 evaluation kit available ?2001 microchip technology inc. ds21489a 5v to 10v voltage converter +b122+b124 regulated gaas fet bias supply features fixed ?4.1v or adjustable ?0.5v to ?9v output at 5ma 4.5v to 10v input voltage range low output voltage ripple tcm850-852 .............................................. 2mvp-p tcm853 ...................................................... 1mvp-p 100khz charge pump switching frequency optional external synchronizing clock input (tcm852) logic level shutdown mode ................ 0.5 a typ. temperature (tcm850/852/853) low cost, 8-pin soic package applications cellular phones negative regulated power supplies lcd bias contrast control adjustable gaas set bias wireless data loggers general description the tcm850/1/2/3 combines an inverting charge pump and a low noise linear regulator in a single small outline package. they are ideal for biasing gaas fets in cellular telephone transmitter power amplifiers all four devices accept a range of input voltages from 4.5v to 10.0v and have ?5ma output current capability. the tcm850/1/2 have both preset (? 4.1v) and variable (?0.5v to ?.0v) output voltages that program with an external resistor divider. the tcm853 output voltage programs with an external positive control voltage. the tcm850/1/3 can be shutdown reducing quiescent current to less than 0.5 a (typ) over temperature, 2 a (typ) for the TCM851. charge pump gnd n fb (gnd to set v out = 4.1v) out negout shdn (tcm850) shdn (TCM851) osc (tcm852) in tcm850 TCM851 tcm852 + 1.28v ref charge pump gnd cont (control voltage) out negout shdn in tcm853 + n c 1 c 1 c 2 c 3 c 2 c 4 c 4 c 3 c 1 + c 1 c 1 + c 1 ordering information part no. package temp. range tcm850coa 8-pin soic 0 c to +70 c tcm850eoa 8-pin soic ?40 c to +85 c TCM851coa 8-pin soic 0 c to +70 c TCM851eoa 8-pin soic ?40 c to +85 c tcm852coa 8-pin soic 0 c to +70 c tcm852eoa 8-pin soic ?40 c to +85 c tcm853coa 8-pin soic 0 c to +70 c tcm853eoa 8-pin soic ?40 c to +85 c tcm850ev evaluation kit for tcm850/1/2/3 functional block diagram figure 1.
2 5v to 10v voltage converter +b122+b124 regulated gaas fet bias supply tcm850 TCM851 tcm852 tcm853 tc850/1/2/3-3 10/1/96 ?2001 microchip technology inc. ds21489a absolute maximum ratings* supply voltage (v in to gnd) .................. ?0.3v to +10.5v v negout to gnd ...................................... ?10.5v to 0.3v v in to v negout ............................................................... ?0.3 to 21v v out to gnd** ........................................ v negout to 0.3v shdn or osc (pin 4) to gnd ........ ?0.3v to (v in + 0.3v) power dissipation (ta < 70 c) soic ...........................................................470mw operating temperature range c device .............................................. 0 c to 70 c e device ....................................... ?40 c to +85 c storage temperature range ................ ?65 c to +165 c lead temperature (soldering, 10 sec) ................. +300 c *this is a stress ratings only and functional operation of the device at these or any other conditions above 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. **the output may be shorted to negout or gnd if the package power dissipation is not exceeded. typical short circuit current to gnd is 50ma. electrical characteristics: v in between +5v and +10v; v out = ?4.1v; r l = open circuit; t a = t min to t max unless otherwise noted. a 100khz, 50% duty cycle square wave between gnd and v in is applied to the osc pin of the tcm852. symbol parameter test conditions min typ max unit v in supply voltage note 1 5 10 v v out output voltage tcm850-tcm852: v fb = 0v (note 3) ?4.3 ?4.1 ?3.9 v tcm853: v ctrl = 4.1v ?4.2 4 output voltage range ?0.5 to ?(v in ?) v v fbset set voltage tcm850-852: no load ?1.32 ?1.28 ?1.24 v i q supply current 2 3 ma i shut shutdown supply current tcm850/853: v in = 10v, shdn = 0v 0.5 a TCM851: shdn = 2v 2 tcm852: osc low 0.5 v out load regulation tcm850-tcm852: v fb = 0v (note 3) 4 8 mv/ma tcm853: v ctrl = 4.1v 3 8 v out ripple tcm850-tcm852 2 mvp-p tcm853 1 f osc oscillator frequency tcm850-tcm853: t a = 25 c (note 2) 80 100 120 khz v ih input high voltage pin 4 2 v v il input low voltage pin 4 0.5 v i in input current pin 4 1 a c in input capacitance pin 4 10 pf notes: 1. the supply voltage can drop to 4.5v, but the output is no longer guaranteed to sink 5ma at ?4.1v. 2. the tcm852 will operate with a 50khz to 250khz square wave of 40% to 60% duty cycle. for best performance, use an 80khz to 120khz square wave with 50% duty cycle. 3. i out = 0ma or 5ma. reference figures 3 and 5.
3 5v to 10v voltage converter +b122+b124 regulated gaas fet bias supply tcm850 TCM851 tcm852 tcm853 tc850/1/2/3-3 10/1/96 ?2001 microchip technology inc. ds21489a pin configurations shdn c1 + c1 negout in out gnd fb tcm850coa tcm850eoa shdn c1 + c1 negout in out gnd fb TCM851coa TCM851eoa osc c1 + c1 negout in out gnd fb tcm852coa tcm852eoa shdn c1 + c1 negout in out gnd cont tcm853coa tcm853eoa 1 2 3 4 8 7 6 5 1 2 3 4 8 7 6 5 1 2 3 4 8 7 6 5 1 2 3 4 8 7 6 5 pin description pin no pin no pin no pin no (tcm850) (TCM851) (tcm852) (tcm853) symbol description 11 11c 1 + c1 positive input terminal. 22 22c 1 c1 negative input terminal. 3 3 3 3 negout negative (unregulated) output voltage. 4 4 shdn shutdown input (ttl active low). 4 shdn shutdown input (ttl active high). 4 osc external oscillator input. 5 5 5 fb feedback input. out is preset to ?4.1v when fb is grounded. out may be adjusted to other voltages by connecting a resistor divider as shown in figure 4. 5 cont control input. v out is adjusted with a positive control voltage (0v to 10v) applied to this input through a resistive divider (figure 5). 6 6 6 6 out output voltage terminal. 7 7 7 7 gnd ground. 8 8 8 8 in positive power supply input voltage (4.5v to 10v). 8-pin soic figure 2.
4 5v to 10v voltage converter +b122+b124 regulated gaas fet bias supply tcm850 TCM851 tcm852 tcm853 tc850/1/2/3-3 10/1/96 ?2001 microchip technology inc. ds21489a the relationship between output voltage and control voltage for the tcm853 (figure 5) is given by: v out = v ctrl (?.28) ( r2 r1 ) figure 4. tcm850/851/852 adjustable application negout fb out v in all caps = 1.0 f unless otherwise noted tcm850 TCM851 tcm852 c 1 c 3 c 2 gnd c 1 + c 1 shdn shdn osc v out = 2.56v r2 = 100k r1 = 100k i out c 4 10 f figure 5. tcm853 standard application circuit detailed device description the voltage applied to v in is inverted by a capacitive charge pump (using commutating capacitor c1 and reser- voir capacitor c2). the negative voltage at negout is then regulated by an internal linear regulator, the output of which is connected to the out pin (figure 1). the most negative output voltage possible is the inverted input voltage (i.e. ? in ) plus 1.0v (required by the post regulator). the linear regulator reduces combined output noise (charge pump ripple plus incoming supply noise) to 2mvp-p for the tcm850/ 1/2 and 1mvp-p for the tcm853. applications information setting the output voltage the tcm850/1/2 operate in the fixed output voltage mode (out = ?4.1v) when the fb input is grounded (figure 3). the output voltage can be adjusted by connecting fb to the midpoint of a resistive voltage divider from out to gnd (figure 4). care must be taken to allow a minimum of 1.0v across the linear regulator for proper regulation. the output voltage is calculated using the formula below (r2 should be chosen to be between 100k ? and 400k ? ): v out = (?.28) ( 1+ r2 r1 ) negout fb out v in v out = 4.1v all caps = 1.0 f unless otherwise noted i out tcm850 TCM851 tcm852 c 1 c 3 c 2 c 4 10 f gnd c 1 + c 1 shdn shdn osc figure 3. tcm850/851/852 standard application negout cont out v in v out = 0.5v to 9.0v v ctrl (0 to 10v) all caps = 1.0 f unless otherwise noted r2 = 100k r1 = 100k i out tcm853 c 1 c 3 c 2 c 4 10 f gnd c 1 + c 1 shdn
5 5v to 10v voltage converter +b122+b124 regulated gaas fet bias supply tcm850 TCM851 tcm852 tcm853 tc850/1/2/3-3 10/1/96 ?2001 microchip technology inc. ds21489a shutdown mode shutdown inputs are provided to reduce tcm850/1/3 supply current during idle periods. when the shutdown input is in its active state, supply current over temperature is reduced to 0.5 a (typ) tcm850/2/3 and 2 a (typ) TCM851. all shutdown inputs are ttl level compatible: tcm850 and tcm853 both have active low inputs (shdn) while the TCM851 has an active high input. the tcm852 can be shutdown by setting the osc input to a logic low level. the tcm852 exits the shutdown state when the clock signal is again restored. charge pump frequency control in applications where the charge pump switching fre- quency may cause interference or filtering problems, it is recommended the tcm852 be used. switching frequency is determined by a 50khz to 250khz square wave signal applied to the osc input. the signal applied to osc can have a duty cycle between 40% and 60%. *note: an external oscillator signal must be applied to the tcm852. the tcm852 does not have an on-board oscillator truebase. capacitors capacitors with low effective series resistance (esr) should be used to maintain sufficient headroom across the linear post regulator. recommended values for c1, c2, and c3 are 1 f, 0.8 ? esr. the recommended value for c4 is 10 f, 0.2 ? . all capacitors should be either surface mount chip tantalum, or chip ceramic types. board layout the tcm850/1/2/3 typically finds use in applications where low output noise is important. to ensure good noise performance, please observe the following basic layout suggestions: (1) mount all components in the circuit as close together as possible. (2) keep trace lengths short; especially those to control inputs such as fb and cont. this will reduce the effect of parasitic capacitance and inductance. (3) minimize ground impedance by employing a ground plane. noise and ripple measurement the tcm850/1/2/3 charge pump switching action causes small ground voltage differences between the tcm850/1/2 /3 circuit and the oscilloscope. these voltage differences cause ground currents in the probe wires inducing voltage spikes and result in erroneous readings. as a result, noise and ripple measurements should be made directly across output capacitor c4. do not use the ground lead of the oscilloscope probe. instead, remove the plastic cover from the probe tip and touch the probe ground ring directly to the negative side of c4. tektronix chassis mount test jack (part number 131-0258) or a nail-type probe tip connect to the probe and minimize noise and ripple measurement error. evaluation kit microchip technology inc. offers evaluation kit (tcm850ev) for the tcm850-853. a second evaluation kit (tc7660ev) evaluates several microchip charge pumps including the tc7660, tc7660s, tc7662b, tc962, tc682. this kit also supports the tcm850 (but not the TCM851- 853).
6 5v to 10v voltage converter +b122+b124 regulated gaas fet bias supply tcm850 TCM851 tcm852 tcm853 tc850/1/2/3-3 10/1/96 ?2001 microchip technology inc. ds21489a typical characteristics input voltage (v) 56 7 8 910 output voltage vs. input voltage over temperature output current (ma) 4.06 4.07 4.08 4.09 4.11 4.10 02 14 36 58 710 9 supply voltage 4.06 4.07 4.08 4.09 4.11 4.10 output voltage output voltage vs. output current v in = 6v i out = 3ma t a = 40 c t a = 85 c t a = 25 c input voltage (v) 2.0 1.5 1.0 0.5 5 6 8 9 7 10 supply current (ma) no-load supply current vs. input voltage input voltage (v) 80 70 60 50 30 20 10 0 40 5.0 6.0 5.5 7.0 6.5 8.0 7.5 9.0 8.5 10.0 9.5 maximum output current (ma) maximum output current vs. input voltage load current (ma) 80 70 60 50 30 20 10 0 40 13 25 47 6910 8 efficiency (%) efficiency vs. load current temperature ( c) 50 -25 0 25 50 75 100 supply current vs. temperature 1.86 1.84 1.82 1.80 1.76 1.78 supply current (ma) v in = 10v v in = 5v v in = 6v v in = 10v
7 5v to 10v voltage converter +b122+b124 regulated gaas fet bias supply tcm850 TCM851 tcm852 tcm853 tc850/1/2/3-3 10/1/96 ?2001 microchip technology inc. ds21489a typical characteristics (cont.) 2.00 1.50 0.50 1.00 .00 5678910 start-up time (msec) start-up time vs. input voltage i out = 5ma input voltage (v) package dimensions 8-pin soic .050 (1.27) typ. 8 max. .244 (6.20) .228 (5.79) .157 (3.99) .150 (3.81) .197 (5.00) .189 (4.80) .020 (0.51) .013 (0.33) .010 (0.25) .004 (0.10) .069 (1.75) .053 (1.35) .010 (0.25) .007 (0.18) .050 (1.27) .016 (0.40) dimensions: inches (mm)
8 5v to 10v voltage converter +b122+b124 regulated gaas fet bias supply tcm850 TCM851 tcm852 tcm853 tc850/1/2/3-3 10/1/96 ?2001 microchip technology inc. ds21489a information contained in this publication regarding device applications and the like is intended through suggestion only and ma y be superseded by updates. it is your responsibility to ensure that your application meets with your specifications. no representation or warrant y is given and no liability is assumed by microchip technology incorporated with respect to the accuracy or use of such information, or infringement of patent s or other intellectual property rights arising from such use or otherwise. use of microchip?s products as critical components in life support systems is not authori zed except with express written approval by microchip. no licenses are conveyed, implicitly or otherwise, except as maybe explicitly expressed herein, under any intellec- tual property rights. the microchip logo and name are registered trademarks of microchip technology inc. in the u.s.a. and othe r countries. all rights reserved. all other trademarks mentioned herein are the property of their respective companies. all rights reserved. ? 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