MAX782CSLASHD datasheet(18/32 Pages) MAXIM

18 / 32 page

Triple-Output Power-Supply

Controller for Notebook Computers

______________________________________________________________________________________

Because this ramp is applied to the current-limit circuit,

the actual time for the output voltage to ramp up

depends on the load current and output capacitor

value. Using Figure 1’s circuit with a 2A load and no

SS capacitor, full output voltage is reached about

600µs after ON_ is driven high.

Boost Capacitors (C4, C5)

Capacitors C4 and C5 store the boost voltage and pro-

vide the supply for the DH3 and DH5 drivers. Use 0.1µF

and place each within 10mm of the BST_ and LX_ pins.

Boost Diodes (D1A, D1B)

Use high-speed signal diodes; e.g., 1N4148 or equivalent.

Bypass Capacitors

Input Filter Capacitors (C1, C13)

Use at least 3µF/W of output power for the input filter

capacitors, C1 and C13. They should have less than

150m

Ω ESR, and should be located no further than

10mm from N1 and N2 to prevent ringing. Connect

the negative terminals directly to PGND. Do not

exceed the surge current ratings of input bypass

capacitors.

VPP and VDD Bypass Capacitors (C10, C11, C12)

Use 2.2µF for VDD, and 1µF for VPPA and VPPB.

Table 3. Surface-Mount Components

(See Figure 1 for schematic diagram and Table 4 for phone numbers.)

EC11FS1

Nihon

Fast-recovery high voltage diode

Sprague

Murata-Erie

1N4148SMTN diodes (fast recovery)

33µF, 35V tantalum capacitors

LR2010-01-R020-F

IRC

0.020

Ω, 1% (SMT) resistor

LR2010-01-R025-F

IRC

0.025

Ω, 1% (SMT) resistor

Si9410DY

Siliconix

N-channel MOSFETs (SO-8)

N1-N4

CDR125-100

Sumida

10µH, 2.65A inductor

EC10QS04

Nihon

1N5819 SMT diodes

D3, D4

BAW56

Philips

D1A, D1B

595DD225X0025B2B

2.2µF, 25V tantalum capacitor

C12

595DD105X0035A2B

1µF, 35V tantalum capacitors

C10, C11

GRM42-6X7R103K50V

Murata-Erie

0.01µF, 16V ceramic capacitors

C8, C9

595D157X0010D2B

Sprague

150µF, 10V tantalum capacitors

C7, C14

595D337X0010R2B

Sprague

330µF, 10V tantalum capacitor

GRM42-6X7R104K50V

0.1µF, 16V ceramic capacitors

C4, C5

595D475X0016A2B

1µF, 20V tantalum capacitor

595D475X0016A2B

4.7µF, 16V tantalum capacitor

595D336X0035R2B

Sprague

C1, C13

PART NO.

MANUFACTURER

SPECIFICATION

COMPONENT

Coiltronics

Transpower Technologies

Transformer (for 5.5V, 200kHz operation)

PC40EEM12.7/13.7-A160

BEM12.7/13.7-118G

FEM12.7/13.7-A

8 turns #24 AWG

18 turns #26 AWG

TDK

Custom Transformer:

Core Set

Bobbin

Clamp

Primary

Secondary

CTX03-12062-1

Coiltronics

CTX03-12067-1

TTI5870

Transformer (these two have different

sizes and pinouts)

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