The MIC2877 is a compact and highly efficient 2 MHz
synchronous boost regulator with a typically 6.5A
switch. It features a bidirectional true load disconnect
function that prevents any leakage current between the
input and output when the device is disabled
(EN = GND), it protects the input supply and improves
the start-up performance.
The MIC2877 has the input voltage range between
2.5V and 5.5V and provides a 2A output continuous
current for V
IN
= 3.0V and V
OUT
= 5V. Fixed and
adjustable versions are available.
The MIC2877 operates in Bypass mode automatically
when the input voltage is higher or equal to the target
output voltage. At light loads, the boost converter goes
to Pulse Frequency Modulation (PFM) mode to
improve the efficiency. In Shutdown mode (EN = GND),
the regulator typically consumes less than 2 µA.
The MIC2877 also features an integrated anti-ringing
switch to minimize EMI, overvoltage and overcurrent
protection, UVLO and thermal shutdown.
The MIC2877 is available in an 8-pin FTQFN 2 x 2 mm
package.
Package Types
MIC2877
(Fixed Output)
8-pin 2 x 2 mm FTQFN
PG
V
IN
A
GND
V
OUTS
EN
V
IN
A
GND
MIC2877
(Adjustable Output)
8-pin 2 x 2 mm FTQFN
PG
FB
EN
P
GND
SW
V
OUT
P
GND
SW
V
OUT
2017 Microchip Technology Inc.
DS20005873A-page 1
MIC2877
Typical Application Schematics
MIC2877 (Fixed Output)
MIC2877 (Adjustable Output)
MIC2877 Efficiency vs. Load Current
100
90
80
70
60
50
40
30
20
10
0
1
V
IN
= 4.5V
Efficiency (%)
V
IN
= 3.3V
V
IN
= 2.5V
V
OUT
= 5V
L = 1 µH
C
OUT
= 3 x 22 µF
10
100
1000
I
OUT
(mA)
DS20005873A-page 2
2017 Microchip Technology Inc.
MIC2877
Functional Block Diagrams
MIC2877 (Fixed Output)
EN
V
IN
ANTI -
RINGING
REFERENCE
GENERATOR
PWM
LOGIC
CONTROL
+
MINIMUM
SWITCHING
SW
V
IN
BODY
DRIVER
OUT
HS
DRIVER
LS
DRIVER
2 MHz
OSCILLATOR
OUTS
OC
6A
PWM
CURRENT
SENSE
+
SLOPE
COMPENSATION
V
IN
/PG
OV FB
OVP
OV REF
VREF
SOFT
START
P
GND
A
GND
MIC2877 (Adjustable Output)
EN
V
IN
ANTI -
RINGING
SW
V
IN
BODY
DRIVER
OUT
HS
DRIVER
REFERENCE
GENERATOR
PWM
LOGIC
CONTROL
+
MINIMUM
SWITCHING
LS
DRIVER
PGL
PGH
2 MHz
OSCILLATOR
/PG
OC
6.5A
PWM
CURRENT
SENSE
+
SLOPE
COMPENSATION
FB
OV FB
OVP
OV REF
VREF
SOFT
START
P
GND
A
GND
2017 Microchip Technology Inc.
DS20005873A-page 3
MIC2877
1.0
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings †
V
IN
, EN, OUT, FB/V
OUTs
, PG, SW to P
GND
.................................................................................................. –0.3V to +6V
A
GND
to P
GND
............................................................................................................................................ –0.3V to +0.3V
EN to A
GND
.................................................................................................................................................. –0.3V to +6V
Power Dissipation............................................................................................................................... Internally Limited
(1)
Lead Temperature (soldering, 10 seconds)........................................................................................................... +260°C
Junction Temperature (T
J
)...................................................................................................................... –40°C to +150°C
Storage Temperature (T
S
) ...................................................................................................................... –40°C to +150°C
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