MAX761ESA Maxim Integrated Products, MAX761ESA Datasheet - Page 11

• Manufacturer Part Number: MAX761ESA
• Description: IC DC/DC CONV STEP-UP 12V 8-SOIC
• Manufacturer: Maxim Integrated Products
• Type: Step-Up (Boost)r

Specifications of MAX761ESA

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 12V, 5 ~ 16.5 V
• Current - Output: 150mA
• Frequency - Switching: 300kHz
• Voltage - Input: 2 ~ 16.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Power - Output: 471mW
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Bypass REF with a 0.1µF capacitor. REF can source up
to 100µA.
To set the low-battery detector’s falling trip voltage
(V
and 3), and calculate R4 as follows:
where V
The rising trip voltage is higher because of the compara-
tor’s hysteresis of approximately 20mV, and can be cal-
culated by:
Connect a high-value resistor (larger than R3 + R4)
between LBI and LBO if additional hysteresis is required.
Table 1. Component Suppliers
TRIP
Setting the Low-Battery Detector Voltage
PRODUCTION METHOD
Surface Mount
Miniature Through-Hole
Low-Cost Through-Hole
Coiltronics
Matsuo
Matsuo
Nichicon
Nihon
Renco
Sanyo
Sanyo
Sumida
Sumida
United Chem-Con
), select R3 between 10kΩ and 500kΩ (Figures 2
REF
R4 = R3 [
V
TRIP
= 1.5V.
(rising) = (V
______________________________________________________________________________________
(V
12V/15V or Adjustable, High-Efficiency,
TRIP
(USA)
(USA)
(Japan)
(USA)
(USA)
(USA)
(USA)
(Japan)
(USA)
(Japan)
(USA)
V
REF
- V
REF
REF
+ 20mV)(1 + R4/R3).
Sumida
Coiltronics
Sumida
RCH855-180M
Renco
)
CD54-180 (22µH)
CTX 100-series
RL 1284-18
INDUCTORS
Reference Capacitor
]
[phone]
[phone]
81-6-337-6450
[phone]
[phone]
[phone]
[phone]
(0720) 70-1005
[phone]
81-3-607-5111
[phone]
Low I
Q
, Step-Up DC-DC Converters
Matsuo
Sanyo
Nichicon
United Chemi-Con
PL series
Low-ESR electrolytics
LXF series
267 series
OS-CON series
Low-ESR organic
semiconductor
FAX [phone]
FAX [phone]
FAX [phone]
FAX [phone]
FAX [phone]
FAX [phone]
FAX [phone]
FAX [phone]
FAX [phone]
FAX [phone]
CAPACITORS
Connect a pull-up resistor (e.g., 100kΩ) between LBO
and V
if the low-battery detector is not used.
Proper PC board layout is essential because of high cur-
rent levels and fast switching waveforms that radiate
noise. Minimize ground noise by connecting GND, the
input bypass-capacitor ground lead, and the output filter-
capacitor ground lead to a single point (star ground con-
figuration). Also minimize lead lengths to reduce stray
capacitance, trace resistance, and radiated noise. The
traces connected to FB and LX, in particular, must be
short. Place bypass capacitor C2 as close as possible to
V+ and GND.
___________Applications Information
OUT
. Tie LBI to GND or V+ and leave LBO floating
Nihon
Motorola
EC10 series
1N5817,
MUR105
DIODES
Layout Considerations
11