MAX782 MAXIM [Maxim Integrated Products], MAX782 Datasheet - Page 18

• Manufacturer Part Number: MAX782
• Description: Triple-Output Power-Supply Controller for Notebook Computers
• Manufacturer: MAXIM [Maxim Integrated Products]

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.
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.
Use high-speed signal diodes; e.g., 1N4148 or equivalent.
Table 3. Surface-Mount Components
(See Figure 1 for schematic diagram and Table 4 for phone numbers.)
18
COMPONENT
D1A, D1B
C10, C11
C1, C13
C7, C14
C4, C5
C8, C9
D3, D4
______________________________________________________________________________________
N1-N4
C12
C2
C3
C6
D2
R1
R2
L1
L2
33µF, 35V tantalum capacitors
4.7µF, 16V tantalum capacitor
1µF, 20V tantalum capacitor
0.1µF, 16V ceramic capacitors
330µF, 10V tantalum capacitor
150µF, 10V tantalum capacitors
0.01µF, 16V ceramic capacitors
1µF, 35V tantalum capacitors
2.2µF, 25V tantalum capacitor
1N4148SMTN diodes (fast recovery)
Fast-recovery high voltage diode
1N5819 SMT diodes
10µH, 2.65A inductor
N-channel MOSFETs (SO-8)
0.025Ω, 1% (SMT) resistor
0.020Ω, 1% (SMT) resistor
Transformer (these two have different
sizes and pinouts)
Transformer (for 5.5V, 200kHz operation)
Custom Transformer:
Core Set
Bobbin
Clamp
Primary
Secondary
Boost Capacitors (C4, C5)
Boost Diodes (D1A, D1B)
SPECIFICATION
Sprague
Sprague
Sprague
Murata-Erie
Sprague
Sprague
Murata-Erie
Sprague
Sprague
Philips
Nihon
Nihon
Sumida
Siliconix
IRC
IRC
Coiltronics
Transpower Technologies
Coiltronics
TDK
TDK
TDK
Use at least 3µF/W of output power for the input filter
capacitors, C1 and C13. They should have less than
150mΩ 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.
Use 2.2µF for VDD, and 1µF for VPPA and VPPB.
MANUFACTURER
VPP and VDD Bypass Capacitors (C10, C11, C12)
Input Filter Capacitors (C1, C13)
595D336X0035R2B
595D475X0016A2B
595D475X0016A2B
GRM42-6X7R104K50V
595D337X0010R2B
595D157X0010D2B
GRM42-6X7R103K50V
595DD105X0035A2B
595DD225X0025B2B
BAW56
EC11FS1
EC10QS04
CDR125-100
Si9410DY
LR2010-01-R025-F
LR2010-01-R020-F
CTX03-12067-1
TTI5870
CTX03-12062-1
PC40EEM12.7/13.7-A160
BEM12.7/13.7-118G
FEM12.7/13.7-A
8 turns #24 AWG
18 turns #26 AWG
Bypass Capacitors
PART NO.