 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
MAX8744A Datasheet(PDF) 15 Page - Maxim Integrated Products |
|
||||||||||||||||||||||||||||||
MAX8744A Datasheet(HTML) 15 Page - Maxim Integrated Products |
|
|
15 / 36 page  High-Efficiency, Quad Output, Main Power- Supply Controllers for Notebook Computers ______________________________________________________________________________________ 15 PIN NAME FUNCTION 32 OUTA Adjustable Auxiliary Linear-Regulator Output. Bypass OUTA to GND with 1µF or greater capacitor (1µF/25mA). When DRVA < OUTA, the secondary feedback control triggers the DL5 for 1µs forcing the controller to recharge the auxiliary storage capacitor. When DRVA exceeds 25V, the MAX8744A/MAX8745A enable a 10mA shunt on OUTA, preventing the storage capacitor from rising to unsafe levels due to the transformer’s leakage inductance. Pulling ONA high enables the linear- regulator driver and the secondary feedback control. EP EP Exposed Pad. Connect the exposed backside pad to analog ground. Pin Description (continued) Table 1. Component Selection for Standard Applications COMPONENT 300kHz 5V AT 5A 3.3V AT 5A 500kHz 5V AT 3A 3.3V AT 5A INPUT VOLTAGE VIN = 7V TO 24V VIN = 7V TO 24V CIN_, Input Capacitor (3) 10µF, 25V Taiyo Yuden TMK432BJ106KM (3) 10µF, 25V Taiyo Yuden TMK432BJ106KM 5V OUTPUT COUT5, Output Capacitor 2x 100µF, 6V, 35m Ω SANYO 6TPE100MAZB 2x 100µF, 6V, 35m Ω SANYO 6TPE100MAZB L5/T5 Inductor/Transformer 6.8µH, 6.4A, 18m Ω (max) 1:2 Sumida 4749-T132 — NH5 High-Side MOSFET Fairchild Semiconductor FDS6612A International Rectifier IRF7807V Fairchild Semiconductor FDS6612A International Rectifier IRF7807V NL5 Low-Side MOSFET Fairchild Semiconductor FDS6670S International Rectifier IRF7807VD1 Fairchild Semiconductor FDS6670S International Rectifier IRF7807VD1 3V OUTPUT COUT3, Output Capacitor 2x 150µF, 4V, 35m Ω SANYO 4TPE150MAZB 2x 100µF, 6V, 35m Ω SANYO 6TPE100MAZB L3, Inductor 5.8µH, 8.6A, 16.2m Ω Sumida CDRH127/LD-5R8NC 3.9µH, 6.5A, 15m Ω Sumida CDRH124-3R9NC NH3 High-Side MOSFET Fairchild Semiconductor FDS6612A International Rectifier IRF7807V Fairchild Semiconductor FDS6612A International Rectifier IRF7807V NL3 Low-Side MOSFET Fairchild Semiconductor FDS6670S International Rectifier IRF7807VD1 Fairchild Semiconductor FDS6670S International Rectifier IRF7807VD1 PIN NAME FUNCTION 15 BST5 Boost Flying Capacitor Connection for the 5V SMPS. The MAX8744A/MAX8745A include an internal boost switch connected between LDO5 and BST5. Connect to an external capacitor as shown in Figure 1. 16 DH5 High-Side Gate-Driver Output for the 5V SMPS. DH5 swings from LX5 to BST5. 17 LX5 Inductor Connection for the 5V SMPS. Connect LX5 to the switched side of the inductor. LX5 serves as the lower supply rail for the DH5 high-side gate driver. 18 DL5 Low-Side Gate-Driver Output for the 5V SMPS. DL5 swings from PGND to LDO5. 19 PGND Power Ground 20 LDO5 5V Internal Linear-Regulator Output. Bypass with 4.7µF minimum (1µF/25mA). Provides at least 100mA for the DL_ low-side gate drivers, the DH_ high-side drivers through the BST switches, the PWM controller, logic, reference, and external loads. If CSL5 is greater than 4.5V and soft-start is complete, the linear regulator shuts down, and LDO5 connects to CSL5 through a 1 Ω switch rated for loads up to 200mA. 21 IN Input of the Startup Circuitry and the LDO5 Internal 5V Linear Regulator. Bypass to PGND with a 0.22µF or greater ceramic capacitor close to the IC. 22 PGOODA Open-Drain, Power-Good Output for the Auxiliary LDO. PGOODA is pulled low if FBA drops more than 10% (typ) below the normal regulation point, and when the auxiliary LDO is shut down. PGOODA becomes high impedance when FBA is in regulation. 23 DL3 Low-Side Gate-Driver Output for the 3.3V SMPS. DL3 swings from PGND to LDO5. 24 LX3 Inductor Connection for the 3.3V SMPS. Connect LX3 to the switched side of the inductor. LX3 serves as the lower supply rail for the DH3 high-side gate driver. 25 DH3 High-Side Gate-Driver Output for the 3.3V SMPS. DH3 swings from LX3 to BST3. 26 BST3 Boost Flying Capacitor Connection for the 3.3V SMPS. The MAX8744A/MAX8745A include an internal boost switch connected between LDO5 and BST3. Connect to an external capacitor as shown in Figure 1. 27 PGOOD3 Open-Drain, Power-Good Output for the 3.3V SMPS. PGOOD3 is pulled low if CSL3 drops more than 10% (typ) below the normal regulation point. PGOOD3 is held low during soft-start and shutdown. PGOOD3 becomes high impedance when CSL3 is in regulation. 28 CSL3 Output Sense and Negative Current Sense for the 3.3V SMPS. When using the internal preset 3.3V feedback divider (FB3 = LDO5), the controller uses CSL3 to sense the output voltage. Connect to the negative terminal of the current-sense element. 29 CSH3 Positive Current-Sense Input for the 3.3V SMPS. Connect to the positive terminal of the current-sense element. Figure 7 describes two different current-sensing options—using accurate sense resistors or lossless inductor DCR sensing. 30 FB3 Feedback Input for the 3.3V SMPS. Connect to LDO5 for fixed 3.3V output. In adjustable mode, FB3 regulates to 2V. 31 FBA Auxiliary LDO Feedback Input. Connect a resistive voltage-divider from OUTA to analog ground to adjust the auxiliary linear-regulator output voltage. FBA regulates at 1V. Pin Description (continued) |
Similar Part No. - MAX8744A |
|
Similar Description - MAX8744A |
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
