Datasheet
MAX629
28V, Low-Power, High-Voltage,
Boost or Inverting DC-DC Converter
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +5V, C
REF
= 0.1µF, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
Note 1: Specifications to -40°C are guaranteed by design and not production tested.
Note 2: The IC itself requires a supply voltage between +2.7V and +5.5V; however, the voltage that supplies power to the inductor
can vary from 0.8V to 28V, depending on circuit operating conditions.
Note 3: For reference currents less than 10µA, a 0.1µF reference-bypass capacitor is adequate.
Circuit of Figure 2, V
OUT
= 24V, V
CC
= 3V to 5.5V,
I
LOAD
= 5mA
%/V0.2Line Regulation
Die temperature °C150
I
REF
= 0µA to 100µA, C
REF
= 0.47µF (Note 3)
Thermal Shutdown Threshold
Circuit of Figure 2, V
OUT
= 24V, V
CC
= 5V,
I
LOAD
= 0mA to 5mA
%0.15Load Regulation
CONDITIONS
mV10 25REF Load Regulation
UNITSMIN TYP MAXPARAMETER
__________________________________________Typical Operating Characteristics
(SHDN = V
CC
, C
REF
= 0.1µF, T
A
= +25°C, unless otherwise noted.)
100
60
0.1 100
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= +24V)
65
70
95
90
85
MAX629-01
LOAD CURRENT (mA)
EFFICIENCY (%)
1 10
80
75
D
D: V
IN
= 5V, ISET = GND
E: V
IN
= 3V, ISET = V
CC
F: V
IN
= 3V, ISET = GND
V
OUT
= 24V
A: V
IN
= 12V, ISET = V
CC
B: V
IN
= 12V, ISET = GND
C: V
IN
= 5V, ISET = V
CC
E, F
C
B
A
100
60
0.1 100
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= +12V)
70
65
95
85
90
MAX629-02
LOAD CURRENT (mA)
EFFICIENCY (%)
1 10
80
75
C
B
A
V
OUT
= 12V,
ISET = V
CC
or GND
A: V
IN
= 9V
B: V
IN
= 5V
C: V
IN
= 3V
300
0
0 20
MAXIMUM LOAD CURRENT vs.
INPUT VOLTAGE (V
OUT
= +24V, +12V)
50
250
200
MAX629-03
INPUT VOLTAGE (V)
MAXIMUM LOAD CURRENT (mA)
8 124 16
150
100
A
B
C
D
A: V
OUT
= 12V,
ISET = V
CC
B: V
OUT
= 12V,
ISET = GND
C: V
OUT
=24V,
ISET = V
CC
D: V
OUT
= 24V,
ISET = GND
100
50
0.1 100
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= -18V)
65
60
55
95
80
85
90
MAX629-04
LOAD CURRENT (mA)
EFFICIENCY (%)
1 10
75
70
C
A
A: V
IN
= 12V, ISET = V
CC
B: V
IN
= 12V, ISET = GND
C: V
IN
= 5V, ISET = V
CC
or GND
D: V
IN
= 3V, ISET = V
CC
or GND
B
D
100
50
0.1 100
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= -12V)
65
60
55
95
80
85
90
MAX629-05
LOAD CURRENT (mA)
EFFICIENCY (%)
1 10
75
70
A
A = V
IN
= 5V, ISET = V
CC
B = V
IN
= 5V, ISET = GND
C = V
IN
= 3V, ISET = V
CC
D = V
IN
= 3V, ISET = GND
D
B, C
90
0
0 20
MAXIMUM LOAD CURRENT vs. INPUT VOLTAGE
(V
OUT
= -18V, -12V)
30
20
10
80
60
70
MAX629-06
INPUT VOLTAGE (V)
MAXIMUM LOAD CURRENT (mA)
4 8 12 16
50
40
C
A
A: V
OUT
= -12V, ISET = V
CC
B: V
OUT
= -18V, ISET = V
CC
C: V
OUT
= -12V, ISET = GND
D: V
OUT
= -18V, ISET = GND
D
B