Datasheet

MAX629
28V, Low-Power, High-Voltage,
Boost or Inverting DC-DC Converter
4 _______________________________________________________________________________________
700
600
0
0 1
SUPPLY CURRENT
vs. INPUT VOLTAGE
500
400
300
100
MAX629-07
INPUT VOLTAGE (V)
SUPPLY CURRENT (µA)
2 3 4 5
200
V
IN
= V
CC
I
CC
I
IN
I
IN
1.255
1.250
1.230
0 20 40
REFERENCE VOLTAGE
vs. REFERENCE LOAD CURRENT
1.245
1.240
MAX629-08
REFERENCE LOAD CURRENT (µA)
REFERENCE VOLTAGE (V)
60 80 100 120 140 160
1.235
V
IN
= V
CC
= 5V
C4 = 0.47µF
OUTPUT VOLTAGE RIPPLE
MAX629-09
V
OUT
= +24V, I
LOAD
= 5mA
A: ISET = V
CC
, 20mV/div
B: ISET = GND, 20mV/div
A
B
10µs/div
SHUTDOWN TRANSIENT
(POSITIVE CONFIGURATION)
MAX629-12
V
CC
= V
IN
= 5V, R
L
= 4kΩ
50ms/div
5V
SHDN
0V
24V
V
OUT
0V
LOAD-TRANSIENT RESPONSE
(I
SET
= V
CC
, I
LIM
= 500mA)
MAX629-10
V
OUT
= +24V, ISET = V
CC
A: LOAD CURRENT, 0mA TO 5mA, 2.5mA/div
B: V
OUT
, AC-COUPLED, 10mV/div
A
5mA
0mA
B
200µs/div
LOAD-TRANSIENT RESPONSE
(I
SET
= GND, I
LIM
= 250mA)
MAX629-11
V
OUT
= +24V, ISET = GND
A: LOAD CURRENT, 0mA TO 5mA, 2.5mA/div
B: V
OUT,
AC-COUPLED, 10mV/div
A
0mA
5mA
B
100µs/div
SHUTDOWN TRANSIENT
(NEGATIVE CONFIGURATION)
MAX629-13
START-UP DELAY, V
CC
= V
IN
= 5V, I
LOAD
= 5mA
20ms/div
V
CC
= V
IN
= 5V, R
L
= 4kΩ
50ms/div
5V
0V
0V
V
OUT
-20V
SHDN
____________________________Typical Operating Characteristics (continued)
(SHDN = V
CC
, C
REF
= 0.1µF, T
A
= +25°C, unless otherwise noted.)