Buck converter delivers high efficiency
in a small package
Analog Devices Inc. (ADI) introduced the Power by Linear
LTC3310S, a 5-V, 10-A low-EMI monolithic synchronous buck
converter that uses the company’s Silent Switcher 2 architecture
with integrated hot loop bypass capacitors. The result: a highly
efficient and small buck converter at frequencies up to 5 MHz
with excellent EMI performance.
The fixed-frequency peak-current mode architecture of the
device is well-suited for high-stepdown-ratio applications that
require fast transient response, according to ADI. Another key
feature is the multiphase operation that enables direct parallel-
ing of multiple devices for higher current.
Thanks to a wide voltage input range of 2.25 V to 5.5 V, the
LTC3310S can be used in a variety of applications, including
most intermediate bus voltages. Integrated low on-resistance
MOSFETs provide continuous load currents as high as 10 A
with minimal thermal derating, and output voltages ranging
from 0.5 V to VIN make the devices suited for point-of-load
applications such as high-current/low-voltage DSP/FPGA/
GPU/ASIC reference designs. Other key applications include
optical networking, telecom/datacom and automotive sys-
tems, distributed power architectures, and general medium- to
high-power-density systems.
The device’s low 35-ns minimum on-time enables ahigh-stepdown-ratio power supply at high frequency, and
100% duty cycle operation delivers low dropout performance.
The operating frequency can be synchronized to an external
clock, said ADI. The total reference voltage accuracy is ±1%
over the –40°C to 125°C operating junction temperature range.
Key specs:- High efficiency: 4.5-mΩ NMOS and 16-mΩ PMOS
- VIN range: 2.25 V to 5.5 V
- VOUT range: 0.5 V to VIN
- VOUT accuracy: ±1%
- 35-ns minimum on-time
- Programmable frequency to 5 MHz
- Shutdown current: 1 μA
- Precision 400-mV enable threshold
Other features include a power good signal when the
output is in regulation, precision enable threshold, output
overvoltage protection, thermal shutdown, die temperature
monitor, clock synchronization, mode selection, and output
short-circuit protection.
The LTC3310S is available in a thermally enhanced 18-lead
3 × 3 × 0.94-mm LQFN package. The E- and I- grades are
specified from –40°C to 125°C operating junction tempera-
ture range. Available from stock, pricing for the LTC3310S
starts at $2.60.
Analog Devices: http://www.analog.com
Lithium-ion battery targets
wearable devices
Panasonic Industrial Devices Sales Company of Amer-
ica recently expanded its family of pin-type lithium-ion
batteries with the introduction of the CG-425A small
cylindrically shaped battery. Delivering high reliability
and rapid charging, the new lithium-ion battery weighs
approximately 1 g (without tabs) with a diameter of 4.7
mm and a height of 25 mm maximum, making it suit-
able for slim pen-shaped or spherical-shaped products.
The next generation of wearable devices will require
smaller, lighter, and longer-lasting batteries that can
be recharged quickly. The CG-425A meets all of those criteria
while providing a nominal voltage of 3.8 V, a charge voltage
of 4.35 A, and a typical capacity of 32.0 mAh. Target applica-
tions include wireless devices such as hearing aids, smart drug
delivery systems (i.e., insulin pens, inhalers), wireless earbuds,
and specialty eyewear.
The CG-425A features a stainless-steel exterior for stability
and reliability and a metallic can to protect against battery
swelling. The batteries are available with tabs or lead wires.
Key features include:- A high-strength stainless exterior case provides safety and
reliability - Rapid charging makes portable devices more user-friendly
- Metallic can prevents battery swelling
- Pin-shaped, 4.7-mm diameter
Panasonic Industrial Devices: na.industrial.panasonic.com
30 NEW PRODUCTS Power
JANUARY 2019 • electronicproducts.com • ELECTRONIC PRODUCTS