Rainbow Electronics MAX15031 - Manual

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 2mA 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
1 2
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 1; 3/09
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.