Digital Power Management IC 2 MHz, 600 mA DC/DC with Dual
300 mA/300 mA Low V
IN
LDOs
Features
• 2.7V to 5.5V Input Voltage Range
• 2 MHz DC/DC Converter and Two LDOs
• Integrated Power-on Reset (POR)
- Adjustable POR Delay Time
• LOWQ Mode
- 30 µA Total IQ when in LOWQ Mode
• DC/DC Converter
- Up to 600 mA of Output Current in PWM
Mode
- LOWQ Mode: NO RIPPLE Light Load Mode
- 75 µV
RMS
Output Noise in LOWQ Mode
- 2 MHz PWM Mode Operation
- > 90% Efficiency
• LDO1 Input Voltage Directly Connected to DC/DC
Converter Output Voltage for Maximum Efficiency
- Ideal for 1.8V to 1.5V Conversion
- 300 mA Output Current from 1.8V Input
- Output Voltage Down to 0.8V
• LDO2 – 300 mA Output Current Capable
• Thermal Shutdown Protection
• Current Limit Protection
• Simple, Leakage-Free Interfacing to Host MPU in
Applications with Backup Power
• Tiny 16-Pin 3mm x 3mm QFN Package
General Description
The MIC2800 is a high-performance power
management IC, featuring three output voltages with
maximum efficiency. Integrating a 2 MHz DC/DC
converter with an LDO post-regulator, the MIC2800
gives two high-efficiency outputs with a second,
300 mA LDO for maximum flexibility. The MIC2800
features a LOWQ mode, reducing the total current
draw while in this mode to less than 30 µA. In LOWQ
mode, the output noise of the DC/DC converter is
reduced to 75 µV
RMS
, significantly lower than other
converters that use a PFM light load mode that can
interfere with sensitive RF circuitry.
The DC/DC converter uses small values of L and C to
reduce board space but still retains efficiencies over
90% at load currents up to 600 mA.
The MIC2800 operates with very small ceramic output
capacitors and inductors for stability, reducing required
board space and component cost and it is available in
various output voltage options in the 16-pin
3mm x 3mm QFN leadless package.
Package Type
MIC2800
16-PIN 3mm
X
3mm QFN
Pin 14
C
SET
Pin 13
Pin 16
Pin 15
Applications
•
•
•
•
Embedded MPU and MCU Power
Portable and Wearable Applications
Low-Power RF Systems
Backup Power Systems
Pin 1
Pin 2
Pin 3
Pin 4
EN2
C
BYP
EN1
LOWQ
BIAS
SGND
PGND
Pin 5 SW
Pin 6 V
IN
V
IN
LDO2
POR
Pin 12
LDO1 Pin 11
LDO
FB
Pin 10
Pin 9
Pin 7
2017 Microchip Technology Inc.
DS20005839A-page 1
Pin 8
MIC2800
Typical Application Circuit (simplified)
MIC2800-G1JS
VIN
V
IN
=
5V typ
VIN
C1
4.7 µF
EN2
LDO1
SW
LDO
SGND
PGND
L1
2.2 µH
DDR2
VDDIO_DDR
2.2 µF
10 µF
SAMA5D2
MPU
VDD_CORE
10 µF
Enable
C
BIAS
100 nF
C
BYP
100 nF
C
SET
10 nF
BIAS
LDO2
C
BYP
10 µF
RC
delay
VDD_IO
EN1
C
SET
POR
/LOWQ
nRST
GPIO
Functional Diagram
DS20005839A-page 2
2017 Microchip Technology Inc.
MIC2800
1.0
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings †
Supply Voltage (V
IN
) ....................................................................................................................................–0.3 to +6.0V
Enable Input Voltage (V
EN1, EN2
) .....................................................................................................–0.3V to +(V
IN
+0.3V)
LOWQ, POR ............................................................................................................................................. –0.3V to +6.0V
Lead Temperature (soldering, 10 sec.) ................................................................................................................. +260°C
Storage Temperature (T
S
) ...................................................................................................................... –65°C to +150°C
) ................................................................................................................................. +2.7V to +5.5V
Enable Input Voltage (V
EN1, EN2
) ..................................................................................................................... 0V to +V
IN
LOWQ, POR .................................................................................................................................................. 0V to +5.5V
Junction Temperature (T
J
) ..................................................................................................................... –40°C to +125°C
Logic analyzers are widely used tools in digital design verification and debugging. They can verify the proper functioning of digital circuits and help users identify and troubleshoot faults. They ...[详细]
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