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Analog Devices ADP1148 manual

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Table of contents for the manual

  • Page 1

    REV. A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analo[...]

  • Page 2

    –2– REV. A ADP1148, ADP1148-3.3, ADP1148-5–SPECIFICA TIONS ELECTRICAL CHARACTERISTICS Parameter Symbol Conditions 2 Min Typ Max Units FEEDBACK VOLTAGE ADP1148 Only V 10 V IN = 9 V 1.21 1.25 1.29 V FEEDBACK CURRENT ADP1148 Only I 10 0.2 1.0 µ A REGULATED OUTPUT VOLTAGE V OUT V IN = 9 V ADP1148-3.3 I LOAD = 700 mA 3.23 3.33 3.43 V ADP1148-5 I [...]

  • Page 3

    –3– REV. A ADP1148, ADP1148-3.3, ADP1148-5 ELECTRICAL CHARACTERISTICS Parameter Symbol Conditions 2 Min Typ Max Units FEEDBACK VOLTAGE ADP1148 Only V 10 V IN = 9 V 1.20 1.25 1.30 V REGULATED OUTPUT VOLTAGE V OUT V IN = 9 V ADP1148-3.3 I LOAD = 700 mA 3.17 3.33 3.4 V ADP1148-5 I LOAD = 700 mA 4.85 5.05 5.2 V INPUT DC SUPPLY CURRENT 3 I Q Normal [...]

  • Page 4

    ADP1148, ADP1148-3.3, ADP1148-5 –4– REV. A CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the ADP1148, ADP1148-3.3, ADP1148-5 feature proprietary ESD protection circuitry, permanent damage may oc[...]

  • Page 5

    T ypical Per formance Characteristics–ADP1148, ADP1148-3.3, ADP1148-5 –5– REV. A MAXIMUM OUTPUT CURRENT – A 200 0 0 5 123 4 150 100 50 R SENSE – m V Figure 3. Selecting R SENSE vs. Maxi- mum Output Current OUTPUT CURRENT – A EFFICIENCY/LOSS – % 100 95 80 0.01 0.03 3.0 0.1 0.3 1.0 90 85 I Q GATE CHARGE I 2 R Figure 6. Typical Efficienc[...]

  • Page 6

    (V IN –V OUT ) – V 12 NORMALIZED FREQUENCY 12 468 1 0 1.8 1.6 0.0 0.8 0.6 0.4 0.2 1.4 1.0 1.2 0 8 C 25 8 C 70 8 C Figure 12. Operating Frequency vs. (V IN –V OUT ) TEMPERATURE – 8 C 155 120 0 100 25 70 85 150 145 140 135 SENSE VOLTAGE – mV 130 125 MAXIMUM THRESHOLD Figure 15. Current Sense Threshold Voltage OPERATING FREQUENCY – kHz GAT[...]

  • Page 7

    ADP1148, ADP1148-3.3, ADP1148-5 –7– REV. A APPLICATIONS The ADP1148 uses a current-mode, constant off-time structure to switch a pair of external complementary N- and P-channel MOSFETs. The operating frequency of the device is deter- mined by the value of the external capacitor connected to the C T pin. The output voltage is sensed by an intern[...]

  • Page 8

    ADP1148, ADP1148-3.3, ADP1148-5 –8– REV. A As the operating frequency is increased, the gate charge losses will cause reduced efficiency (see Efficiency section). The full formula for operating frequency is given by: f = ( 1 – V OUT /V IN )/ t OFF where t OFF = 1.3 × 10 4 × C T × V REG /V OUT. V REG is the desired output voltage (i.e., 5 V[...]

  • Page 9

    ADP1148, ADP1148-3.3, ADP1148-5 –9– REV. A An additional 0.1 µ F – 1 µ F ceramic bypass capacitor is advised on V IN Pin 3 parallel with C IN . The selection of C OUT is driven by the required effective series resistance (ESR). The ESR of C OUT must be less than twice the value of R SENSE for proper operation of the ADP1148: C OUT required [...]

  • Page 10

    ADP1148, ADP1148-3.3, ADP1148-5 –10– REV. A Design Example As a design example, assume V IN = 12 V (nominal), V OUT = 5 V, I MAX = 2 A, and f = 200 kHz, R SENSE . C T , and L can immedi- ately be calculated: R SENSE = 100 mV /2 = 50 m Ω t OFF = (1/200 kHz ) × [1 – (5/12)] = 2.92 µ s C T = 2.92 µ s /(1.3 × 10 4 ) = 220 pF L min = 5.1 × [...]

  • Page 11

    ADP1148, ADP1148-3.3, ADP1148-5 –11– REV. A Board Layout When laying out the printed circuit board, the following check list should be used to ensure proper operation of the ADP1148. These items are also illustrated graphically in the layout diagram of Figure 18. Check the following in your layout: 1) Are the signal and power grounds segregated[...]

  • Page 12

    ADP1148, ADP1148-3.3, ADP1148-5 –12– REV. A P-DRIVE NC V IN C T INT V CC I TH SENSE(–) N-DRIVE NC POWER GND SIGNAL GND SHUTDOWN V FB SENSE(+) ADP1148-3.3 C C 3300pF R C 1k V IRF7403 D1 10BQ040 V IN 4V TO 18V IRF7204 C IN 100 m F 20V *L 50 m H C OUT 220 m F 10V 3 2 AVX 1000pF **R SENSE 0.1 V 10nF C T 300pF 1 m F 1 2 3 4 5 6 7 14 13 12 11 10 9 [...]

  • Page 13

    ADP1148, ADP1148-3.3, ADP1148-5 –13– REV. A P-DRIVE NC V IN C T INT V CC I TH SENSE(–) N-DRIVE NC POWER GND SIGNAL GND SHUTDOWN V FB SENSE(+) ADP1148 C C 3300pF R C 1k V IRF7403 D1 10BQ040 V IN 5.2V TO 14V IRF7204 C IN 100 m F 20V *L 50 m H R1B 43k V 1% R2 56k V 1% C OUT 220 m F 10V 3 2 OS-CON 100pF 1000pF **R SENSE 0.05 V 10nF C T 390pF 1 m [...]

  • Page 14

    ADP1148, ADP1148-3.3, ADP1148-5 –14– REV. A OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 14-Lead Plastic DIP (N-14) 14 17 8 0.795 (20.19) 0.725 (18.42) 0.280 (7.11) 0.240 (6.10) PIN 1 0.325 (8.25) 0.300 (7.62) 0.015 (0.381) 0.008 (0.204) 0.195 (4.95) 0.115 (2.93) SEATING PLANE 0.022 (0.558) 0.014 (0.356) 0.060 (1.52) 0.015 (0.38) 0.2[...]

  • Page 15

    –15–[...]

  • Page 16

    –16– C2219a–2–12/97 PRINTED IN U.S.A.[...]