MAX863 Maxim, MAX863 Datasheet - Page 8

• Manufacturer Part Number: MAX863
• Description: Dual / High-Efficiency / PFM / Step-Up DC-DC Controller
• Manufacturer: Maxim

Dual, High-Efficiency, PFM, Step-Up
DC-DC Controller
Figures 3a–3f. MAX863 Switching Waveforms During Transition into Continuous Conduction
Figure 4a. Non-Bootstrapped Typical Operating Circuit
8
_______________________________________________________________________________________
A
B
C
V
IN
= 2.7V TO THE LOWER OF V
a) I
220 F
0.1
OUT1
V
20 s/div
10V
C1
OUT1
V
PLOTS a-d: INTERNAL FEEDBACK
PLOTS e-f: UNCOMPENSATED,
A: MOSFET DRAIN, 2V/div
B: V
C: INDUCTOR CURRENT, 1A/div
= 287mA
OUT1
= 5V
OUT
R5
R6
= 3.3V
1, 100mV/div, 3.3V DC OFFSET
EXTERNAL FEEDBACK
OUT1
100k
R7
LOW-BATTERY
DETECTOR OUTPUT
OR V
MBRS340T3
OUT2
D1
b) I
OUT1
N1.A
20 s/div
= 608mA
L1
10 H
2A
R1
50m
100 F
0.1
10V
C3
SENSE1
CS1
LBI
FB1
EXT1
LBO
C
A
B
BOOT
MAX863
PGND
C2
0.1 F
c) I
e) I
SHDN1
SHDN2
OUT1
EXT2
OUT1
V
20 s/div
GND
20 s/div
CS2
REF
DD
FB2
100 F
= 767mA
0.1
= 757mA
10V
C4
50m
R2
ON/OFF
N1.B
IRF7301
C7
0.1 F
L2
10 H
2A
MBRS340T3
1M
D2
1%
1M
R3
f) I
d) I
OUT1
R4
115k
1%
20 s/div
OUT1
20 s/div
= 881mA
= 1.01A
V
C6
10pF
OUT2
C8
82pF
= 12V
C5
100 F
20V
0.1
OV
3.3V
0A
OV
3.3V
0A