參數(shù)資料
型號(hào)： MAX786
廠商： Maxim Integrated Products, Inc.
英文描述： Dual-Output Power-Supply Controller for Notebook Computers(具有25μA關(guān)斷的,3.3V/5V筆記本型電腦電源)
中文描述： 雙輸出電源控制器，用于筆記本電腦
文件頁(yè)數(shù)： 13/24頁(yè)
文件大小： 301K
代理商： MAX786
M
Dual-Output Power-S upply
Controller for Notebook Computers
______________________________________________________________________________________
13
Table 1. Surface-Mount Components
(See Figure 1 for Standard Application Circuit.)
Internal V L and REF S upplies
An internal linear regulator produces the 5V used by the
internal control circuits. This regulator’s output is avail-
able on pin VL and can source 5mA for external loads.
Bypass VL to GND with 4.7μF. To save power, when the
+5V switch-mode supply is above 4.5V, the internal lin-
ear regulator is turned off and the high-efficiency +5V
switch-mode supply output is connected to VL.
The internal 3.3V bandgap reference (REF) is powered
by the internal 5V VL supply. It can furnish up to 5mA.
Bypass REF to GND with 0.22μF, plus 1μF/mA of load
current. The main switching outputs track the reference
voltage. Loading the reference will reduce the main
outputs slightly, according to the reference load-regula-
tion error.
Both the VL and REF outputs remain active, even when
the switching regulators are turned off, to supply mem-
ory keep-alive power (see Shutdown Mode section).
These linear-regulator outputs can be directly connected
to the corresponding step-down regulator outputs (i.e.,
REF to +3.3V, VL to +5V) to keep the main supplies alive
in standby mode. However, to ensure start-up, standby
load currents must not exceed 5mA on each supply.
Fault Protection
The +3.3V and +5V PWM supplies and the compara-
tors are disabled when either of two faults is present:
VL < +4.0V or REF < +2.8V (85% of its nominal value).
__________________Design Proc edure
Figure 1’s schematic and Table 2’s component list
show values suitable for a 3A, +5V supply and a 3A,
+3.3V supply. This circuit operates with input voltages
from 6.5V to 30V, and maintains high efficiency with
output currents between 5mA and 3A (see the Typical
Operating Characteristics). This circuit’s components
may be changed if the design guidelines described in
this section are used —but before beginning the
design, the following information should be firmly
established:
COMPONENT
SPECIFICATION
MANUFACTURER
PART NO.
C1, C10
33μF, 35V tantalum capacitors
AVX
Sprague
AVX
Sprague
AVX
Sprague
Murata-Erie
Sprague
Sprague
Murata-Erie
Central Semiconductor
Nihon
Sumida
Siliconix
IRC
TPSE226M035R0100
595D336X0035R
TAJ B475M016
595D475X0016A
TAJ A105M025
595D105X0020A2B
GRM42-6X7R104K50V
595D337X0010R
595D157X0010D
GRM42-6X7R103K50V
CMPD2836
EC10QS04
CDR125-100
Si9410DY
LR2010-01-R025-F
C2
4.7μF, 6V tantalum capacitor
C3
1μF, 20V tantalum capacitor
C4, C5
C6
C7, C12
C8, C9
D2A, D2B
D1, D3
L1, L2
N1–N4
R1, R2
0.1μF, 16V ceramic capacitors
330μF, 10V tantalum capacitor
150μF, 10V tantalum capacitors
0.01μF, 16V ceramic capacitors
1N4148-type dual diode
1N5819 SMT diodes
10μH, 2.65A inductor
N-channel MOSFETs (SO-8)
0.025
, 1% (SMT) resistor
COMPANY
FACTORY FAX
[COUNTRY CODE]
[1] (207) 283-1941
USA PHONE
AVX
(207) 282-5111
(800) 282-4975
Central Semiconductor
IRC
Murata-Erie
Nihon
Siliconix
Sprague
Sumida
[1] (516) 435-1824
[1] (213) 992-3377
[1] (404) 736-3030
[81] 3-3494-7414
[1] (408) 727-5414
[1] (508) 339-5063
[81] 3-3607-5428
(516) 435-1110
(512) 992-7900
(404) 736-1300
(805) 867-2555
(408) 988-8000
(508) 339-8900
(708) 956-0666
Table 2. Component Suppliers
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