CIE Sept P27:new 08/09/2009 12:31 Page 27
Product News l Power Management
Precision op amp from Intersil
delivers best bias current drift
Intersil's ISL28207 op amp features advanced
bias current cancellation techniques that can
achieve extremely low bias current drift over
the operating temperature range, making it
well-suited for high-impedance input signals for
process controls, automated test equipment,
and data acquisition.
The first in a family of operational amplifiers
built using the company's new proprietary
bipolar process technology, the ISL28207 is a
dual 40V low-power bipolar precision
operational amplifier that exhibits outstanding Other advantages include lower power
DC precision and superb temperature drift performance with exceptionally low noise and
performance. high DC precision accuracy over temperature
The device offers a low offset voltage of 75 (low offset drift), which are required for wireless
micro-V max and a typical input bias current of sensor applications, portable data acquisition,
60pA. Temperature drift is only 0.65 micro- instrumentation, and remote power meters.
V/degree C max for input offset voltage and Also a high ESD protection (4kV HBM)
0.2pA/degree C for input bias current, making reduces in-field failures for industrial
it suitable for 16- and 24-bit applications. The applications in data acquisition and process
ISL28207 exhibits a wide operating voltage control.
range of 4.5V to 40V and an operating
temperature range of -40 to 125 degrees C. Intersil | www.intersil.com
Linear announce
over-current conditions. It charges a variety of
battery pack configurations, including 1 to 3
breakthrough 2A
Li-Ion/Polymer cells in series, 1 to 4 LiFePO4
(Lithium Iron Phosphate) cells in series and
solar battery charger
sealed lead acid (SLA) batteries up to 14.4V.
Applications include solar powered systems,
Linear Technology has introduced the 12V to 24V automotive equipment and
LT3652, an innovative, solar power directed battery chargers.
monolithic buck battery charger IC for The LT3652’s charge current is
modern battery chemistries. The LT3652 programmable up to 2A. This stand-alone
features an innovative input voltage battery charger requires no external
regulation loop, which controls charge microcontroller, and features user-selectable
current to hold the input voltage at a termination, including C/10 or an onboard
programmed level. When the LT3652 is timer. The device’s 1MHz fixed switching
connected to a solar panel, the input frequency enables small solution sizes. Float
regulation loop maintains the panel at peak voltage feedback accuracy is specified at
output power. Steve Pietkiewicz, Vice ±0.5%, charge current accuracy is ±5% and
President and General Manager of Power C/10 detection accuracy is ±2.5%. Once
Products, said: “The LT3652’s simple but charging is terminated, the LT3652
unique input voltage regulation loop circuitry automatically enters a low current standby
delivers virtually the same charging efficiency mode, which reduces the input supply
as more complex and expensive Maximum current to 85uA. In shutdown, the input bias
Peak Power Tracking (MPPT) techniques.” current is reduced to 15uA. For autonomous
The LT3652 accepts a wide range of inputs charge control, an auto-recharge feature
from 4.95V to 32V with a 40V absolute starts a new charging cycle if the battery
maximum rating for added system margin. voltage falls 2.5% below the programmed
The input voltage regulation loop also allows float voltage.
optimised charging from poorly regulated
sources where the input can collapse under Linear Technology | www.linear.com
IR 150V and 200V MOSFETs feature
low gate charge
International Rectifier has launched a new series
of 150V and 200V HEXFET power MOSFETs
with ultra low gate charge (Qg) for industrial
applications including Switch Mode Power
Supplies (SMPS), uninterruptable power
supplies (UPS), inverters and DC motor drives.
IR’s 150V MOSFETs offer up to 59 percent
lower total gate charge than competing
devices while the new 200V MOSFETs feature
up to 33 percent lower total gate charge than
competing devices. telecom applications or driving light load
As DC-DC power converter applications efficiency in any advanced DC-DC application.
advance and switching frequencies increase, The new MOSFETs are qualified to industrial
input capacitance and gate charge play a grade and are moisture sensitivity level 1
significant role in overall efficiency. IR’s new (MSL1). The devices are available in TO220,
150V and 200V MOSFETs are optimised for fast D2PAK, TO262, DPAK and IPAK packages,
switching circuits where switching losses are offered lead free and are RoHS compliant.
critical, and, therefore, are suited as a primary
switch for isolated DC-DC converters for International Rectifier | www.ir.com
www.cieonline.co.uk Components in Electronics September 2009 27
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