The MIC2876 is a compact and highly efficient 2 MHz
synchronous boost regulator with a 4.8A switch. It
features a bi-directional load disconnect function that
prevents any leakage current between the input and
output when the device is disabled. The MIC2876
operates in bypass mode automatically when the input
voltage is greater than the target output voltage. At light
loads, the boost converter goes to the PFM mode to
improve the efficiency.
The MIC2876 also features an integrated anti-ringing
switch to minimize EMI.
The MIC2876 is available in a 8-pin 2 mm × 2 mm
UDFN package, with a junction temperature range of
–40°C to +125°C.
Applications
•
•
•
•
•
Tablets and Smartphones
USB OTG and HDMI Hosts
Portable Power Reserve Supplies
High-Current Parallel Lithium Cell Applications
Portable Equipment
Package Types
MIC2876 (F
IXED
O
UTPUT
)
8-Pin 2x2 UDFN* (MT)
(Top View)
MIC2876 (A
DJ
. O
UTPUT
)
8-Pin 2x2 UDFN* (MT)
(Top View)
SW 1
PGND 2
IN 3
AGND 4
EP
8 OUT
7 /PG
6 EN
5 OUTS
SW 1
PGND 2
IN 3
AGND 4
EP
8 OUT
7 /PG
6 EN
5 FB
* Includes Exposed Thermal Pad (EP), see
Table 3-1.
2016 Microchip Technology Inc.
DS20005572A-page 1
MIC2876
Typical Application Schematics
MIC2876 (Fixed Output)
2x2 UDFN
L1
1μH
MIC2876 (Adj. Output)
2x2 UDFN
L1
1μH
2.5V to 5.0V
V
IN
C1
4.7μF
10V
SW
IN
EN
OUT
R1
/PG
OUTS
V
IN
V
OUT
5.0V
C2*
22μF
10V
2.5V to 5.0V
V
IN
C1
4.7μF
10V
SW
IN
EN
OUT
R1
/PG
FB
R3
V
IN
R2
V
OUT
5.0V
C2*
22μF
10V
PGND
AGND
PGND
AGND
*
Two more 22 µF capacitors should be added in parallel with C2 for V
IN
> 5.0V.
Efficiency vs. Load Current
Functional Block Diagrams
MIC2876 (Fixed Output)
EN
IN
ANTI-
RINGING
REFERENCE
GENERATOR
SW
VIN
BODY
DRIVER
OUT
HS
DRIVER
PWM
LOGIC
CONTROL
LS
DRIVER
OUTS
VIN
OC
4.8A
CURRENT
SENSE
+
SLOPE
COMPENSATION
/PG
2MHz
OSCILLATOR
PWM
LOGIC
CONTROL
LS
DRIVER
PGL
PGH
OC
4.8A
CURRENT
SENSE
+
SLOPE
COMPENSATION
MIC2876 (Adj. Output)
EN
IN
ANTI-
RINGING
REFERENCE
GENERATOR
SW
VIN
BODY
DRIVER
OUT
HS
DRIVER
2MHz
OSCILLATOR
/PG
PWM
PWM
FB
VREF
SOFT-
START
VREF
SOFT-
START
PGND
AGND
PGND
AGND
DS20005572A-page 2
2016 Microchip Technology Inc.
MIC2876
1.0
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings †
IN, EN, OUT, FB, /PG to PGND ................................................................................................................... –0.3V to +6V
AGND to PGND ........................................................................................................................................ –0.3V to +0.3V
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