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MIC23099YFT

Description
Single AA/AAA Cell Step-Up/Step-Down Regulators
File Size2MB,26 Pages
ManufacturerMicrochip
Websitehttps://www.microchip.com
Download Datasheet View All

MIC23099YFT Overview

Single AA/AAA Cell Step-Up/Step-Down Regulators

MIC23099
Single AA/AAA Cell Step-Up/Step-Down
Regulators with Battery Monitoring
General Description
The MIC23099 is a high-efficiency, low-noise, dual-output,
integrated power-management solution for single-cell
alkaline or NiMH battery applications. The synchronous
boost output voltage (V
OUT1
) is enabled first and is
powered from the battery. Next the synchronous buck
output (V
OUT2
), which is powered from the boost output
voltage, is enabled. This configuration allows V
OUT2
to be
independent of battery voltage, thereby allowing the buck
output voltage to be higher or lower than the battery
voltage.
To minimize switching artifacts in the audio band, both the
converters are design to operate with a minimum switching
frequency of 80kHz for the buck and 100kHz for the boost.
The high current boost has a maximum switching
frequency of 1MHz, minimizing the solution footprint.
The MIC23099 incorporates both battery-management
functions and fault protection. The low-battery level is
indicated by an external LED connected to the LED pin. In
addition, a supervisory circuit monitors each output and
asserts a power-good (PG) signal when the sequencing is
done or de-asserted when a fault condition occurs.
Datasheets and support documentation are available on
Micrel’s web site at:
www.micrel.com.
Features
V
IN
range from 0.85V to 1.6V
V
OUT1
(step-up) adjustable from 1.8V to 3.3V
V
OUT2
(step-down) adjustable from 1.0V to V
OUT2
V
OUT1
/400mW and V
OUT2
/30mA from a single cell
Minimizes switching noise in the audio band
Step-up regulator with output disconnect in shutdown
V
OUT1
, above 90% efficiency for 5mA to 200mA
Anti-ringing control circuit to minimize EMI
Turn-on inrush current limiting and soft-start
Automatic output discharge
Low-battery indicator
Power Good (PG) output
Low output ripple < 10mV
Short-circuit and thermal protection
14-pin 2.5mm × 2.5mm × 0.55mm thin QFN (TQFN)
package
• −40°C
to +125°C junction temperature range
Applications
Audio headsets
Portable applications
Typical Application
Efficiency (V
IN
= 1.2V)
vs. Output Current
100
BOOST
V
OUT1
= 1.8V
90
EFFICIENCY (%)
80
BUCK
V
OUT2
= 1.0V
70
60
LED Pin = OPEN
L1 = IFSC1515AHER6R8M01M
L2 = SPM4012T-4R7M
50
40
0.001
0.01
0.1
0.2
OUTPUT CURRENT (A)
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 •
http://www.micrel.com
May 27, 2014
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