MAX786CAI+T Maxim Integrated Products, MAX786CAI+T Datasheet - Page 13

• Manufacturer Part Number: MAX786CAI+T
• Description: IC CNTRLR PWR SUP DL 28SSOP
• Manufacturer: Maxim Integrated Products
• Type: Step-Down (Buck)r

Specifications of MAX786CAI+T

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 2
• Voltage - Output: 3.3V, 5V
• Current - Output: 3A
• Frequency - Switching: 200kHz, 300kHz
• Voltage - Input: 5.5 ~ 30 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 28-SSOP
• Power - Output: 762mW
• Output Voltage: 3.3 V, 3.45 V, 3.6 V
• Input Voltage: 5.5 V to 30 V
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 2. Component Suppliers
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
Table 1. Surface-Mount Components
(See Figure 1 for Standard Application Circuit.)
AVX
Central Semiconductor
IRC
Murata-Erie
Nihon
Siliconix
Sprague
Sumida
COMPONENT
D2A, D2B
C1, C10
C7, C12
C4, C5
C8, C9
D1, D3
N1–N4
R1, R2
L1, L2
COMPANY
C2
C3
C6
33µF, 35V tantalum capacitors
4.7µF, 6V tantalum capacitor
1µF, 20V tantalum capacitor
0.1µF, 16V ceramic capacitors
330µF, 10V tantalum capacitor
150µF, 10V tantalum capacitors
0.01µF, 16V ceramic capacitors
1N4148-type dual diodes
1N5819 SMT diodes
10µH, 2.65A inductors
N-channel MOSFETs (SO-8)
0.025Ω, 1% (SMT) resistors
Internal VL and REF Supplies
______________________________________________________________________________________
[COUNTRY CODE]
[1] [phone]
[1] [phone]
[1] [phone]
[1] [phone]
[81] 3-3494-7414
[1] [phone]
[1] [phone]
[81] 3-3607-5144
FACTORY FAX
SPECIFICATION
Controller for Notebook Computers
[phone]
[phone]
[phone]
[phone]
[phone]
[phone]
[phone]
[phone]
[phone]
USA PHONE
Dual-Output Power-Supply
IRC
AVX
Sprague
AVX
Sprague
AVX
Sprague
Murata-Erie
Sprague
Sprague
Murata-Erie
Central Semiconductor
Nihon
Sumida
Siliconix
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.
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).
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:
__________________Design Procedure
MANUFACTURER
TPSE226M035R0100
595D336X0035R
TAJB475M016
595D475X0016A
TAJA105M025
595D105X0020A2B
GRM42-6X7R104K50V
595D337X0010R
595D157X0010D
GRM42-6X7R103K50V
CMPD2836
EC10QS04
CDR125-100
Si9410DY
LR2010-01-R025-F
PART NO.
Fault Protection
13