ADP1761-EVALZ/adp1762-evalz/adp1763-evalz user guide ug-954 one technology way ? p. o. box 9106 ? norwood, ma 02062-9106, u.s.a. ? tel: 781.329.4700 ? fax: 781.461.3113 ? www.analog.com evaluating the adp1761 / adp1762 / adp1763 low v in , low noise, cmos linear regulators please see the last page for an important warning and legal terms and conditions. rev. 0 | page 1 of 9 features input voltage range: 1.1 v to 1.98 v output current range adp1761 : 0 ma to 1 a adp1762 : 0 ma to 2 a adp1763 : 0 ma to 3 a output voltage accuracy: 1.5% operating temperature range: ?40c to +125c general description the adp1761 , the adp1762 , and the adp1763 evaluation boards demonstrate the functionality of the adp1761 , the adp1762 , and the adp1763 series of linear regulators. simple device measurements, such as line and load regulation, dropout voltage, and ground current, are demonstrated with only a single voltage supply, a voltmeter, an ammeter, and load resistors. for full details on the adp1761 , the adp1762 , and the adp1763 line regulators, see the adp1761 , the adp1762 , and the adp1763 data sheets, which should be consulted in conjunction with this user guide when using this evaluation board. adp1761, adp1762, and adp1763 evaluation boards 14354-001 figure 1. the adp1761 , the adp1762 , and the adp1763 fixed board 14354-002 figure 2. the adp1761 , the adp1762 , and the adp1763 adjustable board
ug-954 ADP1761-EVALZ/adp1762-evalz/adp1763-evalz user guide rev. 0 | page 2 of 9 table of contents features .............................................................................................. 1 ? general description ......................................................................... 1 ? adp1761, adp1762, and adp1763 evaluation boards ............. 1 ? revision history ............................................................................... 2 ? evaluation board hardware ............................................................ 3 ? evaluation board configurations .............................................. 3 ? output voltage measurements ................................................... 4 ? line regulation measurements .................................................. 5 ? load regulation measurements ..................................................5 ? dropout voltage measurements ..................................................5 ? ground current measurements ..................................................6 ? ground current consumption ...................................................6 ? schematics and silkscreens ..............................................................7 ? ordering information .......................................................................9 ? bill of materials ..............................................................................9 ? revision history 4/16revision 0: initial version
ADP1761-EVALZ/adp1762-evalz/adp1763-evalz user guide ug-954 rev. 0 | page 3 of 9 evaluation board hardware evaluation board configurations the adp1761 , the adp1762 , and the adp1763 evaluation boards come supplied with different components, depending on the version ordered. components common to all versions are c1, c2, c3, c4, c5, j1, and r2. use r1 for the adjustable output version of the adp1761 , the adp1762 , and the adp1763 evaluation boards. figure 9 and figure 10 show the schematics of these evaluation board configurations, and table 1 describes the hardware components. the adp1761 , the adp1762 , and the adp1763 adjustable option has an output voltage range of 0.5 v to 1.5 v. the output voltage is set to 1.1 v by the external 7.32 k adjust resistor. calculate the output voltage (v out ) by v out = a d ( r adj i adj ) where: a d is the gain factor with a typical value of 3 between the vadj pin and vout pin. r adj is the resistor connected between the vadj pin and ground. i adj is the 50 a constant current out of the vadj pin. the adp1761 , the adp1762 , and the adp1763 fixed option uses a 1.3 v output model. do not connect r1 for the fixed output option. calculate the start-up time of the regulator by t start-up_fixed = t delay + v ref ( c ss / i ss ) t start-up_adj = t delay + v adj ( c ss / i ss ) where: t delay is a fixed delay of 100 s. v ref is a 0.5 v internal reference for the fixed output model option. c ss is the soft start capacitance from ss to gnd. i ss is the current sourced from ss (10 a). v adj is the voltage at the vadj pin equal to r adj i adj . table 1. evaluation board hardware components component description u1 adp1761, adp1762 , and adp1763 low dropout linear regulators. for the fixed output option, u1 uses the 1.3 v output option of the adp1761, the adp1762, and the adp1763. for the adjustable output option, u1 uses the adjustable option of the adp1761 , the adp1762, and the adp1763 and is set to 1.1 v. c1 input bypass capacitor (c in ), 10 f, 0603 size. c2 output capacitor (c out ), 10 f, 0603 size. c3 soft start capacitor (c ss ), 10 nf, 0603 size. c4 regulator capacitor (c reg ), 1 f, 0603 size. c5 reference capacitor (c reg ), 1 f, 0603 size. j1 jumper (connects en to vin for automatic startup) r1 adjust resistor (r adj ) used to set the output voltage of the adjustable version of the adp1761 , the adp1762 , and the adp1763 . r2 pull-up resistor (r pull-up ) used for the open-drain pgood output pin.
ug-954 ADP1761-EVALZ/adp1762-evalz/adp1763-evalz user guide rev. 0 | page 4 of 9 output voltage measurements 1.29999 +? voltmeter +? voltage source load 14354-004 figure 3. output voltage measurement setup figure 3 shows how the evaluation boards can be connected to a voltage source and a voltmeter for basic output voltage accuracy measurements. a resistor can be used as the load for the regulator. ensure that the resistor has a power rating that is adequate to handle the power expected to dissipate across it. an electronic load can also be used as an alternative. ensure that the voltage source can supply enough current for the expected load levels. follow these steps to connect the evaluation board to a voltage source and voltmeter: 1. connect the negative terminal (?) of the voltage source to one of the gnd pads on the evaluation board. 2. connect the positive terminal (+) of the voltage source to the vin pad on the evaluation board. 3. connect a load between the vout pad and one of the gnd pads on the evaluation board. 4. connect the negative terminal (?) of the voltmeter to one of the gnd pads on the evaluation board. 5. connect the positive terminal (+) of the voltmeter to the vout pad on the evaluation board. when these steps are completed, the voltage source can be turned on. if j1 is inserted (connecting en to vin for automatic startup), the regulator powers up. if the load current is large, the user must connect the voltmeter as close as possible to the output capacitor to reduce the effects of ir voltage drops.
ADP1761-EVALZ/adp1762-evalz/adp1763-evalz user guide ug-954 rev. 0 | page 5 of 9 line regulation measurements for line regulation measurements, the output of the regulator is monitored while its input is varied. for good line regulation, the output must change as little as possible with varying input levels. to ensure that the device is not in dropout mode during line regulation measurement, v in must be varied between v out + 0.2 v (or 1.1 v, whichever is greater) and 1.98 v. for example, for an adp1761 , an adp1762 , or an adp1763 device with a fixed 1.3 v output, vin must be varied between 1.5 v and 1.98 v. this measurement can be repeated under different load conditions. figure 4 shows the typical line regulation performance of an adp1761 , an adp1762 , and an adp1763 with a fixed 1.3 v output. 1.298 1.300 1.302 1.304 1.306 1.308 1.310 1.5 1.6 1.7 1.8 1.9 2.0 output voltage (v) input voltage (v) i load = 100ma i load = 1a i load = 2a i load = 3a 14354-005 figure 4. output voltage vs. input voltage at v out = 1.3 v, t a = 25c load regulation measurements for load regulation measurements, the output of the regulator is monitored while the load is varied. for good load regulation, the output must change as little as possible with varying load. the input voltage must be held constant during load regulation measurement. the load current can be varied from 0 ma to 1 a for the adp1761 , 0 ma to 2 a for the adp1762 , and 0 ma to 3 a for the adp1763 . figure 5 shows the typical load regulation performance of an adp1761 , an adp1762 , and an adp1763 with a fixed 1.3 v output for an input voltage of 1.5 v. 1.301 1.302 1.302 1.303 1.303 0.01 0.1 1 10 output voltage (v) load current (a) 14354-006 figure 5. output voltage vs. load current at v in = 1.5 v, v out = 1.3 v, t a = 25c dropout voltage measurements the dropout voltage can be measured using the configuration shown in figure 3. dropout voltage is defined as the input to output voltage differential when the input voltage is set to the nominal output voltage. the adp1761 , the adp1762 , and the adp1763 only enter dropout mode for output voltages of at least 1.2 v. for lower voltage outputs, the adp1761 , the adp1762 , and the adp1763 enter undervoltage lockout and shut down. the dropout voltage increases with larger loads. for accurate measurements, use a second voltmeter to monitor the input voltage across the input capacitor. the input supply voltage may need adjusting to account for ir drops, especially when using large load currents. figure 6 shows the typical curve of dropout voltage measurements with different load currents. 0 10 20 30 40 50 60 70 80 90 100 0.1 1 10 dropout v o ltage (mv) load current (a) 14354-007 figure 6. dropout voltage vs. load current, v out = 1.3 v, t a = 25c
ug-954 ADP1761-EVALZ/adp1762-evalz/adp1763-evalz user guide rev. 0 | page 6 of 9 ground current measurements figure 8 shows how the adp1761 , the adp1762 , or the adp1763 evaluation board can be connected to a voltage source and an ammeter for ground current measurements. a resistor can be used as the load for the regulator. ensure that the resistor has a power rating that is adequate to handle the power expected to be dissipated across it. an electronic load can be used as an alternative. ensure that the voltage source can supply enough current for the expected load levels. follow these steps to connect the evaluation board to a voltage source and ammeter: 1. connect the positive terminal (+) of the voltage source to the vin pad on the evaluation board. 2. connect the positive terminal (+) of the ammeter to one of the gnd pads on the evaluation board. 3. connect the negative terminal (?) of the ammeter to the negative (?) terminal of the voltage source. 4. connect a load between the vout pad on the evaluation board and the negative (?) terminal of the voltage source. when these connection steps are completed, the voltage source can be turned on. if j1 is inserted (connecting en to vin for automatic startup), the regulator powers up. ground current consumption ground current measurements can determine how much current the internal circuits of the regulator consume while the circuits perform the regulation function. to be efficient, the regulator must consume as little current as possible. typically, the regulator uses the maximum current when supplying its largest load level (1 a for the adp1761 , 2 a for the adp1762 , and 3 a for the adp1763 ). figure 7 shows the typical ground current consumption for various load levels at v out = 1.3 v and t a = 25c. when the device is disabled (en = gnd), the ground current drops to less than 2 a. 0 2 4 6 8 10 12 14 1.5 1.6 1.7 1.8 1.9 2.0 ground current (ma) input voltage (v) no load i load = 10ma i load = 100ma i load = 500ma i load = 1a i load = 2a i load = 3a 14354-009 figure 7. ground current vs. input voltage, v out = 1.3 v, t a = 25c 0.012345 + ammeter + load voltage source 14354-008 figure 8. ground current measurement setup
ADP1761-EVALZ/adp1762-evalz/adp1763-evalz user guide ug-954 rev. 0 | page 7 of 9 schematics and silkscreens 14354-109 figure 9. fixed output schematic
ug-954 ADP1761-EVALZ/adp1762-evalz/adp1763-evalz user guide rev. 0 | page 8 of 9 14354-109 figure 10. adjustable output schematic 14354-011 figure 11. top layer 14354-010 figure 12. bottom layer
ADP1761-EVALZ/adp1762-evalz/adp1763-evalz user guide ug-954 rev. 0 | page 9 of 9 ordering information bill of materials table 2. reference designator description manufacturer part number c1, c2 capacitors, mlcc, 10 f, 6.3 v, 0603, x5r murata (or equivalent) grm188r60j106me47d c3 capacitor, mlcc, 10 nf, 25 v, 0603, x7r murata (or equivalent) grm188r71e103ka0 c4, c5 capacitors, mlcc, 1 f, 10 v, 0603, x7r murata (or equivalent) grm188r71a105ka61d j1 header/jumper, single, str, two pins fci 69157-102hlf r1 resistor, 0603, 7.32 k, 1% tolerance (do not install on th e fixed model) any manufacturer depends on manufacturer r2 resistor, 0603, 100 k, 1% tolerance any manufacturer depends on manufacturer u1 ic, low input, low dropout regulators, including the following devices: analog devices, inc. adp1761-1.3-evalz adp1761acpz-1.3-r7 adp1762-1.3-evalz adp1762acpz-1.3-r7 adp1763-1.3-evalz adp1763acpz-1.3-r7 adp1761-adj-evalz adp1761acpz-r7 adp1762-adj-evalz adp1762acpz-r7 adp1763-adj-evalz adp1763acpz-r7 esd caution esd (electrostatic discharge) sensitive device . charged devices and circuit boards can discharge without detectio n. although this product features patented or proprietary pr otection circuitry, damage may occur on devices subjected to high energy esd. therefore, proper esd precautions should be taken to avoid performance degradation or loss of functionality. legal terms and conditions by using the evaluation board discussed herein (together with any tools, components documentation or support materials, the ev aluation board), you are agreeing to be bound by the terms and conditions set forth below (agreement) unless you have purchased the evaluation board, in which case the analog devices standard terms a nd conditions of sale shall govern. do not use the evaluation board until you have read and agreed to the agreement. your use of the evaluation board shall signify your acceptance of the agreement. this a greement is made by and between you (customer) and analog devices, inc. (adi), with its principal place of business at one technology way, norwood, ma 02062, usa. subject to the terms and condition s of the agreement, adi hereby grants to customer a free, limited, personal, temporary, non-exclusive, non-sublicensable, non-transferable li cense to use the evaluation board for evaluation purposes only. customer understands and agrees that the evaluation board is provided for the sole and exclusive purpose referenced above, and agrees not to use the evaluation board for any other purpose. furthermore, the license granted is expressly made subject to the following additional limitations: customer shall not (i) rent, lease, display, sell, transfer, assign, sublicense, or distribute the evaluation boar d; and (ii) permit any third party to access the evaluation board. as used herein, the term third party includes any entity other than adi, customer, their employees, affiliates and in-house consultants. the evaluatio n board is not sold to customer; all righ ts not expressly granted herein, including ownership of the evaluation board, are reserved by adi. confiden tiality. this agreement and the evaluation board shall all be c onsidered the confidential and propriet ary information of adi. customer may not disclose or transfer any portion of the evaluation board to any other party for any reason. upon discontinuation of use of the evaluation board or termination of this agreement, customer agrees to promptly return the evaluation board to adi. additional restri ctions. customer may not disassemble, decompile or reverse engine er chips on the evaluation board. customer shall inform adi of any occurred damages or any modifications or alterations it makes to the evaluation board, including but not limited to soldering o r any other activity that affects the material content of the evaluation board. modifications to the evaluation board must comply with applicable law, including but not limited to the rohs directive. termina tion. adi may terminate this agreement at any time upon giving written notice to customer. customer agrees to return to adi the evaluation board at that time. limitation of liability. the evaluation board provided hereunder is provided as is and adi makes no warranties or representations of any kind with respect to it. adi specifically disclaims any re presentations, endorsements, gua rantees, or warranties, express or implied, related to the evaluation board including, but not limited to, the implied warranty of merchantability, title, fitness for a particular purpose or noninfringement of intellectual property rights. in no event will adi and its licensors be liable for any incidental, special, indirect, or consequential damag es resulting from customers possession or use of the evaluation board, including but not limited to lost profits, delay costs, labor costs or loss of goodwill. adis total liab ility from any and all causes shall be limited to the amount of one hundred us dollars ($100.00). export. customer agrees that it will not directly or indirectly export the evaluati on board to another country, and that it will comply with all applicable united states federal laws and regulations relating to exports. governing law. this agreement shall be governed by and constru ed in accordance with the substantive laws of the commonwealth of massachusetts (excluding conflict of law rules). any legal action regarding this agreement will be heard in the state or federa l courts having jurisdiction in suffolk county, massachusetts, and customer hereby submits to the personal jurisdiction and venue of such courts. the united nations convention on contracts for the international sale of goods shall not apply to this agreement and is expressly disclaimed. ?2016 analog devices, inc. all rights reserved. trademarks and registered trademarks are the prop erty of their respective owners. ug14354-0-4/16(0)
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