MAX15031
80V, 300mW Boost Converter and Current
Monitor for APD Bias Applications
_______________________________________________________________________________________ 3
Note 2: All minimum/maximum parameters are tested at T
A
= +125°C. Limits over temperature are guaranteed by design.
Note 3: Guaranteed by design and not production tested.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Soft-Start Duration 8ms
Soft-Start Steps (0.25 x I
LIM_LX
) to I
LIM_LX
32 Steps
CONTROL INPUT (CNTRL)
Maximum Control Input Voltage
Range
FB set point is regulated to V
CNTRL
1.25 V
CURRENT MONITOR
Bias Voltage Range V
BIAS
10 76 V
I
APD
= 500nA 100 µA
Bias Quiescent Current I
BIAS
I
APD
= 2mA 3.2 mA
Voltage Drop V
DROP
I
APD
= 2mA, V
DROP
= V
BIAS
- V
APD
1V
I
APD
= 500nA 1 GΩ
Dynamic Output Resistance at
MOUT
R
MOUT
I
APD
= 2.5mA 890 MΩ
MOUT Output Leakage APD is unconnected 1 nA
Output Clamp Voltage
V
MOUT
-
V
CLAMP
Forward diode current = 1mA 0.5 0.73 0.95 V
Output Clamp Leakage Current V
BIAS
= V
CLAMP
= 76V 1 nA
Output-Voltage Range V
MOUT
10V ≤ V
BIAS
≤ 76V, 0 ≤ I
APD
≤ 1mA, CLAMP
is unconnected
V
BIAS
-
1V
V
I
APD
= 500nA 0.095 0.1 0.11
Current Gain I
MOUT
/I
APD
I
APD
= 2mA 0.965 0.1 0.1035
I
APD
= 500nA
(Note 3)
-1000 +300 +1500
Power-Supply Rejection Ratio PSRR
(∆I
MOUT
/I
MOUT
)/∆V
BIAS
,
V
BIAS
= 10V to 76V
I
APD
= 5µA to
1mA
-250 +24 +250
ppm/V
APD Input Current Limit I
LIM_APD
V
APD
= 35V, R
LIM
= 3.3kΩ 3.15 3.75 4.35 mA
Current-Limit Adjustment Range 12.45kΩ ≥ R
LIM
≥ 2.5kΩ 15mA
I
APD
= 500nA 7.5 ms
Power-Up Settling Time t
S
I
MOUT
settles to within
0.1%, 10nF connected
from APD to ground
I
APD
= 2.5mA 90 µs
LOGIC INPUTS/OUTPUTS
SHDN Input-Voltage Low V
IL
0.8 V
SHDN Input-Voltage High V
IH
2.4 V
ILIM Output-Voltage Low V
OL
I
LIM
= 2mA 0.3 V
ILIM Output Leakage Current I
OH
V
ILIM
= 11V 1 µA
THERMAL PROTECTION
Thermal Shutdown Temperature rising +160 °C
Thermal Shutdown Hysteresis 10 °C
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= V
PWR
= 3.3V. V
SHDN
= 3.3V. C
IN
= C
PWR
= 10µF. C
CP
= 10nF, V
CNTRL
= V
IN
. V
RLIM
= 0. V
PGND
= V
SGND
= 0. V
BIAS
= 40V.
APD = unconnected. CLAMP = unconnected. ILIM = unconnected, MOUT = unconnected. T
A
= T
J
= -40°C to +125°C, unless other-
wise noted. Typical values are at T
A
= +25°C.) (Note 2)
(33 páginas)
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