MAX863 Maxim, MAX863 Datasheet - Page 4

• 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
4
(T
____________________________Typical Operating Characteristics (continued)
A
_______________________________________________________________________________________
A
B
= +25°C, unless otherwise noted.)
V
A: V
B: I
OUT1
OUT1
OUT1
LOAD-TRANSIENT RESPONSE
= 3.3V, I
, 200mA/div
, 100mV/div, 3.3V DC OFFSET
OUT1
100 s/div
= 100mA TO 600mA
100
60
50
40
30
20
10
90
80
70
60
50
40
30
20
10
0
0
0.01
0
Cond: Single +5V
(V
EFFICIENCY vs. OUTPUT CURRENT
OUT1
2
0.1
= 12V, NON-BOOTSTRAPPED)
OUTPUT CURRENT (mA)
vs. V
V
CONVERTER 1 ON
CONVERTER 2 ON
4
V
DD
DD
A
1
DD
VOLTAGE (V)
BOTH ON
CURRENT
B
VOLTAGE
6
C
10
D
8
C
A
B
V
A: V
B: V
C: V
D: V
E: V
OUT1
100
IN
IN
IN
V
A: SHDN1, 5V/div
B: INDUCTOR CURRENT, 2A/div
C: V
IN
IN
EXITING SHUTDOWN (BOOTSTRAPPED)
E
10
OUT1
= 6.0V
= 5.0V
= 2.7V
= 3.3V
= 3.6V
= 4.0V
OUT1
= 3.3V, I
, 3.3V OFFSET, 500mV/div
1000
12
RESPONSE ENTERING/
OUT1
200 s/div
= 100mA, V
IN
= 2.4V
140
120
100
3.5
3.0
2.5
2.0
1.5
1.0
0.5
80
60
40
20
0
1
SUPPLY VOLTAGE AND MOSFET CAPACITANCE
0
1
Cond: Single 5V
3.3V
C,2
B,1
BOOTSTRAPPED-MODE MINIMUM
EXT RISE AND FALL TIMES vs.
2
START-UP INPUT VOLTAGE
B,2
A,1
A,2
vs. OUTPUT CURRENT
C,1
A
B
C
OUTPUT CURRENT (mA)
SUPPLY VOLTAGE (V)
10
4
V
A: V
B: V
C: INDUCTOR CURRENT, 2A/div
OUT1
IN
OUT1
6
= 5V, I
= 2.7V TO 3.7V, 500mV/div
LINE-TRANSIENT RESPONSE
, AC COUPLED, 50mV/div
OUT1
100
8
V
V
OUT1
= 800mA
A: 470pF
B: 1.0nF
C: 2.2nF
1: RISE
2: FALL
500 s/div
OUT1
10
= 3.3V
= 5V
1000
12
0A