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MAX15031ATE+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17
General Description
The MAX15031 consists of a constant-frequency pulse-
width modulating (PWM) step-up DC-DC converter with
an internal switch and a high-side current monitor with
high-speed adjustable current limiting. This device can
generate output voltages up to 76V and provides current
monitoring up to 4mA (up to 300mW). The MAX15031
can be used for a wide variety of applications such as
avalanche photodiode biasing, PIN biasing, or varactor
biasing, and LCD displays. The MAX15031 operates
from 2.7V to 11V.
The constant-frequency (400kHz), current-mode PWM
architecture provides low-noise output voltage that is
easy to filter. A high-voltage, internal power switch
allows this device to boost output voltages up to 76V.
Internal soft-start circuitry limits the input current when
the boost converter starts. The MAX15031 features a
shutdown mode to save power.
The MAX15031 includes a current monitor with more
than three decades of dynamic range and monitors cur-
rent ranging from 500nA to 4mA with high accuracy.
Resistor-adjustable current limiting protects the APD
from optical power transients. A clamp diode protects
the monitor’s output from overvoltage conditions. Other
protection features include cycle-by-cycle current limit-
ing of the boost converter switch, undervoltage lockout,
and thermal shutdown if the die temperature reaches
+160°C.
The MAX15031 is available in a thermally enhanced
4mm x 4mm, 16-pin TQFN package and operates over
the -40°C to +125°C automotive temperature range.
Applications
Avalanche Photodiode Biasing and Monitoring
PIN Diode Bias Supplies
Low-Noise Varactor Diode Bias Supplies
FBON Modules
GPON Modules
LCD Displays
Features
♦ Input Voltage Range
+2.7V to +5.5V (Using Internal Charge Pump) or
+5.5V to +11V
♦ Wide Output-Voltage Range from (V
IN
+ 1V) to 76V
♦ Internal 1Ω (typ) 80V Switch
♦ 300mW Boost Converter Output Power
♦ Accurate ±10% (500nA to 1mA) and ±3.5% (1mA
to 4mA) High-Side Current Monitor
♦ Resistor-Adjustable Ultra-Fast APD Current Limit
(1µs Response Time)
♦ Open-Drain Current-Limit Indicator Flag
♦ 400kHz Fixed Switching Frequency
♦ Constant PWM Frequency Provides Easy Filtering
in Low-Noise Applications
♦ Internal Soft-Start
♦ 2µA (max) Shutdown Current
♦ -40°C to +125°C Temperature Range
♦ Small Thermally Enhanced, 4mm x 4mm, 16-Pin
TQFN Package
MAX15031
80V, 300mW Boost Converter and Current
Monitor for APD Bias Applications
________________________________________________________________
Maxim Integrated Products
1
15
16
14
13
6
5
7
CP
IN
8
PWR
CLAMP
RLIM
APD
12
SHDN
4
12 11 9
PGND
LX
ILIM
CNTRL
FB
SGND
CN MOUT
3
10
BIAS
THIN QFN
(4mm
×
4mm)
TOP VIEW
MAX15031
+
*EP
*EXPOSED PAD
Pin Configuration
Ordering Information
19-4299; Rev 2; 6/09
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
EVALUATION KIT
AVAILABLE
PART TEMP RANGE PIN-PACKAGE
MAX15031ATE+ -40°C to +125°C 16 TQFN-EP*
+
Denotes a lead(Pb)-free/RoHS-compliant package.
*
EP = Exposed pad.
Typical Operating Circuits appear at end of data sheet.
MAX15031
80V, 300mW Boost Converter and Current
Monitor for APD Bias Applications
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(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)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-
layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial
.
PWR, IN to SGND ...................................................-0.3V to +12V
LX to PGND ............................................................-0.3V to +80V
BIAS, APD to SGND ...............................................-0.3V to +80V
SHDN to SGND............................................-0.3V to (V
IN
+ 0.3V)
CLAMP to SGND......................................-0.3V to (V
BIAS
+ 0.3V)
FB, ILIM, RLIM, CP, CN, CNTRL to SGND .............-0.3V to +12V
PGND to SGND .....................................................-0.3V to +0.3V
MOUT to SGND ....................................-0.3V to (V
CLAMP
+ 0.3V)
Continuous Power Dissipation
16-Pin TQFN (derate 25mW/°C above +70°C) ............2000mW
Thermal Resistance (Note 1)
θ
JA
....................................................................................40°C/W
θ
JC
......................................................................................6°C/W
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
2.7 5.5
Supply Voltage Range V
IN
, V
PWR
CP connected to IN, C
CP
= open 5.5 11
V
V
FB
= 1.4V, no switching 1 2
Supply Current I
SUPPLY
V
IN
= 11V, V
FB
= 1.4V (no switching),
C
CP
= open, CP = IN
1.2 3
mA
Undervoltage Lockout Threshold V
UVLO
V
IN
rising 2.375 2.5 2.675 V
Undervoltage Lockout Hysteresis V
UVLO_HYS
100 mV
Shutdown Current I
IN_SHDN
SHDN pulled low 2 μA
BIAS Current During Shutdown I
BIAS_SHDN
V
BIAS
= 3.3V, V
SHDN
= 0
30 μA
BOOST CONVERTER
Output-Voltage Adjustment
Range
V
IN
+
1V
76 V
V
IN
= V
PWR
= 5V 360 400 440
Switching Frequency f
SW
2.9V V
PWR
11V, V
IN
= V
PWR
352 400 448
kHz
Maximum Duty Cycle D
CLK
2.9V V
PWR
11V, V
IN
= V
PWR
86 90 94 %
FB Set-Point Voltage V
FB
1.2201 1.245 1.2699 V
FB Input Bias Current I
FB
100 nA
V
PWR
= V
IN
= 2.9V,
V
CP
= 5.5V
1 2
I
LX
= 100mA
V
PWR
= V
IN
= 5.5V,
V
CP
= 10V
1 2
V
PWR
= V
IN
= V
CP
= 5.5V 1 2
Internal Switch On-Resistance R
ON
I
LX
= 100mA,
V
CP
= V
IN
V
PWR
= V
IN
= V
CP
= 11V 1 2
Peak Switch Current Limit I
LIM_LX
0.8 1.2 1.6 A
LX Leakage Current V
LX
= 36V 1 μA
Line Regulation
2.9V V
PWR
11V, V
PWR
= V
IN
,
I
LOAD
= 4.5mA
0.2 %
Load Regulation 0 I
LOAD
4.5mA 1 %
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 8 ms
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
1 V
I
APD
= 500nA 1 G
Dynamic Output Resistance at
MOUT
R
MOUT
I
APD
= 2.5mA 890 M
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 0.0965 0.1 0.1035
I
APD
= 500nA -1000 +300 +1500
Power-Supply Rejection Ratio
(Note 3)
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
= 3.3k 3.15 3.75 4.35 mA
Current-Limit Adjustment Range 12.45k R
LIM
2.5k 1 5 mA
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)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17

MAX15031ATE+T

Mfr. #:
Buy MAX15031ATE+T
Manufacturer:
Maxim Integrated
Description:
Switching Voltage Regulators 80V 300mW Boost Conv/Current Mtr
Lifecycle:
New from this manufacturer.
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