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PDF MAX15031 Data sheet ( Hoja de datos )
| Número de pieza | MAX15031 | |
| Descripción | 300mW Boost Converter and Current Monitor | |
| Fabricantes | Maxim Integrated Products | |
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19-4299; Rev 2; 6/09
EVAALVUAAILTAIOBNLEKIT
80V, 300mW Boost Converter and Current
Monitor for APD Bias Applications
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
Typical Operating Circuits appear at end of data sheet.
Features
♦ Input Voltage Range
+2.7V to +5.5V (Using Internal Charge Pump) or
+5.5V to +11V
♦ Wide Output-Voltage Range from (VIN + 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
Ordering Information
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.
Pin Configuration
TOP VIEW
12 11 10 9
BIAS 13
SHDN 14
PGND 15
MAX15031
LX 16
+
*EP
8 ILIM
7 CNTRL
6 FB
5 SGND
1234
*EXPOSED PAD
THIN QFN
(4mm × 4mm)
________________________________________________________________ Maxim Integrated Products 1
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.
Datasheet pdf - http://www.DataSheet4U.net/
1 page  
www.DataSheet.co.kr
80V, 300mW Boost Converter and Current
Monitor for APD Bias Applications
Typical Operating Characteristics (continued)
(VPWR = VIN = 3.3V, VOUT = 70V, circuit of Figure 3 (Figure 4 for VIN > 5.5V), unless otherwise noted.)
LIGHT-LOAD SWITCHING
WAVEFORM WITH RC FILTER
MAX15031 toc09
IOUT = 0.1mA, VBIAS = 70V
VBIAS
AC-COUPLED
1mV/div
VLX
50V/div
0V
IL
500mA/div
0mA
HEAVY-LOAD SWITCHING
WAVEFORM WITH RC FILTER
MAX15031 toc10
IOUT = 4mA, VBIAS = 70V
VBIAS
AC-COUPLED
1mV/div
VLX
50V/div
0V
IL
500mA/div
0mA
1μs/div
1μs/div
70.0
69.8
69.6
69.4
69.2
69.0
68.8
68.6
68.4
68.2
68.0
0
LOAD-TRANSIENT RESPONSE
MAX15031 toc11
VOUT
AC-COUPLED
200mV/div
LINE-TRANSIENT RESPONSE
MAX15031 toc12
VIN
2V/div
3.3V
100ms/div
ILOAD
5mA/div
0mA
VOUT = 70V
VIN = 3.3V
100ms/div
VOUT = 70V
IOUT = 1mA
tRISE = 50μs
VOUT
AC-COUPLED
100mV/div
LOAD REGULATION
1234
LOAD CURRENT (mA)
5
110
100
90
80
70
60
50
40
30
20
10
0
3
MAXIMUM LOAD CURRENT
vs. INPUT VOLTAGE
A
B
CD
EF
A: VOUT = 30V, B: VOUT = 35V, C: VOUT = 45V,
D: VOUT = 55V, E: VOUT = 60V, F: VOUT = 72V
4 5 6 7 8 9 10 11
INPUT VOLTAGE (V)
LX LEAKAGE CURRENT
vs. TEMPERATURE
200
180
CURRENT INTO
LX PIN
160
140
120
100
80
60
40
20
0
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
BIAS CURRENT
vs. BIAS VOLTAGE
10
1 IAPD = 2mA
0.1 IAPD = 500nA
0.01
0
10 20 30 40 50 60 70 80
BIAS VOLTAGE (V)
_______________________________________________________________________________________ 5
Datasheet pdf - http://www.DataSheet4U.net/
5 Page 
www.DataSheet.co.kr
80V, 300mW Boost Converter and Current
Monitor for APD Bias Applications
The MAX15031 includes a versatile current monitor
intended for monitoring the APD, PIN, or varactor diode
DC current in fiber and other applications. The
MAX15031 features more than three decades of
dynamic current ranging from 500nA to 4mA and pro-
vides an output current accurately proportional to the
APD current at MOUT.
The MAX15031 also features a shutdown logic input to
disable the device and reduce its standby current to
2μA (max).
Fixed-Frequency PWM Controller
The heart of the MAX15031 current-mode PWM con-
troller is a BiCMOS multiple-input comparator that
simultaneously processes the output-error signal and
switch current signal. The main PWM comparator uses
direct summing, lacking a traditional error amplifier and
its associated phase shift. The direct summing configu-
ration approaches ideal cycle-by-cycle control over the
output voltage since there is no conventional error
amplifier in the feedback path.
The device operates in PWM mode using a fixed-fre-
quency, current-mode operation. The current-mode fre-
quency loop regulates the peak inductor current as a
function of the output error signal.
The current-mode PWM controller is intended for DCM
(discontinuous conduction mode) operation. No internal
slope compensation is added to the current signal.
Charge Pump
At low supply voltages (2.7V to 5.5V), internal charge-
pump circuitry and an external 10nF ceramic capacitor
connected between CP and CN double the available inter-
nal supply voltage to drive the internal switch efficiently.
In the 5.5V to 11V supply voltage range, the charge
pump is not required. In this configuration, disable the
charge pump by connecting CP to IN and leaving CN
unconnected.
Monitor Current Limit (RLIM)
The current limit of the current monitor is programmable
from 1mA to 5mA. Connect a resistor from RLIM to
ground to program the current-limit threshold up to 5mA.
The current monitor mirrors the current out of APD with
a 1:10 ratio, and the MOUT current can be converted to
a voltage signal by connecting a resistor from MOUT to
SGND.
The APD current-monitor range is from 500nA to 4mA,
and the MOUT current-mirror output accuracy is ±10%
from 500nA to 1mA of APD current and ±3.5% from
1mA to 4mA of APD current.
Clamping the Monitor
Output Voltage (CLAMP)
CLAMP provides a means for diode clamping the volt-
age at MOUT; thus VMOUT is limited to (VCLAMP +
0.6V). CLAMP can be connected to either an external
supply or BIAS. CLAMP can be left unconnected if volt-
age clamping is not required.
Adjusting the Boost Converter
Output Voltage (FB/CNTRL)
The boost converter output voltage can be set by con-
necting FB to a resistor-divider from VOUT to ground.
The set-point feedback reference is the 1.245V (typ)
internal reference voltage when VCNTRL > 1.5V and is
equal to the CNTRL voltage when VCNTRL < 1.25V.
To change the converter output on the fly, apply a volt-
age lower than 1.25V (typ) to the CNTRL input and
adjust the CNTRL voltage, which is the reference input
of the error amplifier when VCNTRL < 1.25V (see the
Functional Diagram). This feature can be used to adjust
the APD voltage based on the APD mirror current,
which compensates for the APD avalanche gain varia-
tion with temperature and manufacturing process. As
shown in Figure 4, the voltage signal proportional to the
MOUT current is connected to the ADC (analog to digi-
tal) input of the APD module, which then controls the
reference voltage of the boost converter error amplifier
through a DAC (digital to analog) block connected to
the CNTRL input. The BIAS voltage and, therefore, the
APD current, are controlled based on the MOUT mirror
current, forming a negative feedback loop.
Shutdown (SHDN)
The MAX15031 features an active-low shutdown input
(SHDN). Pull SHDN low to enter shutdown. During shut-
down, the supply current drops to 2μA (30μA from
BIAS) (max). However, the output remains connected to
the input through the inductor and the output diode,
holding the output voltage to one diode drop below
PWR when the MAX15031 shuts down. Connect SHDN
to IN for always-on operation.
______________________________________________________________________________________ 11
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11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet MAX15031.PDF ] | |
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