MIC2875 Datasheet, PDF (2/24 Pages) Microchip Technology – 4.8A ISW, Synchronous Boost Regulator with Bi-Directional Load Disconnect

MIC2875
Typical Application Schematics
MIC2875 (Fixed Output)
2.5V to 5.0V
V_IN
C1
4.7μF
10V
L1 1μH
IN
EN
SW
OUT
R1
1MΩ
/PG
V_IN
OUTS
V_OUT
5.0V
C2*
22μF
10V
PGND AGND
MIC2875 (Adjustable Output)
2.5V to 5.0V
V_IN
C1
4.7μF
10V
L1 1μH
SW
IN
EN
OUT
R1
1MΩ
/PG
V_IN
FB
PGND AGND
R2
910kΩ
R3
200kΩ
V_OUT
5.0V
C2*
22μF
10V
* Two more 22F capacitors should be added in parallel with C2 for V_IN > 5.0V.
Efficiency vs. Load Current
100
90
V_IN = 3.6V
80
V_IN = 3.0V
70
V_IN = 2.5V
60
50
0.001
V_OUT = 5.0V
L = 1μH
C_OUT = 22μF
0.010
0.100
LOAD CURRENT (A)
1.000
Functional Block Diagrams
MIC2875 (Fixed Output)
EN IN
SW
ANTI-
RINGING
REFERENCE
GENERATOR
VIN
BODY
DRIVER
2MHz
OSCILLATOR
PWM LOGIC
CONTROL
+
MINIMUM
SWITCHING
LS
DRIVER
OC
PWM
4.8A
CURRENT
SENSE
+
SLOPE
COMPENSATION
HS
DRIVER
VIN
OUT
OUTS
/PG
VREF
SOFT-
START
PGND
AGND
MIC2875 (Adj. Output)
EN IN
SW
ANTI-
RINGING
REFERENCE
GENERATOR
VIN
BODY
DRIVER
2MHz
OSCILLATOR
PWM LOGIC
CONTROL
+
MINIMUM
SWITCHING
LS
DRIVER
OC
PWM
4.8A
CURRENT
SENSE
+
SLOPE
COMPENSATION
HS
DRIVER
PGL
PGH
VREF
SOFT-
START
OUT
/PG
FB
PGND
AGND
DS20005549A-page 2
 2015 Microchip Technology Inc.