MAX15059 Datasheet, PDF (9/15 Pages) Maxim Integrated Products – 76V, 300mW Boost Converter and Current Monitor for APD Bias Applications

76V, 300mW Boost Converter and Current
Monitor for APD Bias Applications
Pin Configuration
TOP VIEW
12 11 10 9
BIAS 13
LX 14
LX 15
MAX15059
PGND 16
+
EP
8 SGND
7 ILIM
6 CNTRL
5 FB
1
2
3
4
TQFN
PIN
1, 16
2
3
4, 8
5
6
7
9
10
11
Pin Description
NAME
PGND
IN
SHDN
SGND
FB
CNTRL
ILIM
RLIM
MOUT
CLAMP
FUNCTION
Power Ground. Connect the negative terminals of the input and output capacitors to PGND. Connect
PGND externally to SGND at a single point, typically at the return terminal of the output capacitor.
Input-Supply Voltage. Bypass IN to PGND with a ceramic capacitor of 1FF minimum value.
Active-Low Shutdown Control Input. Apply a logic-low voltage to SHDN to shut down the device.
Connect SHDN to IN for normal operation. Ensure that V_SHDN is not greater than the input voltage, VIN.
SHDN is internally pulled low. The converter is disabled when SHDN is left unconnected.
Signal Ground. Connect directly to the local ground plane. Connect SGND to PGND at a single point,
typically near the return terminal of the output capacitor.
Feedback Regulation Input. Connect FB to the center tap of a resistive voltage-divider from the boost
output to SGND to set the output voltage. The FB voltage regulates to 1.23V (typ) when VCNTRL is
above 1.3V (typ) and to VCNTRL when VCNTRL is below 1.2V (typ).
Control Input for Boost Converter Output-Voltage Programmability. CNTRL allows the feedback set-point
voltage to be set externally by CNTRL when CNTRL is less than 1.2V. Pull CNTRL above 1.3V (typ) to
use the internal 1.23V (typ) feedback set-point voltage.
Open-Drain Current-Limit Indicator. ILIM asserts low when the APD current limit has been exceeded.
Current-Limit Resistor Connection. Connect a resistor from RLIM to SGND to program the APD current-
limit threshold. When RLIM is connected to SGND, the current limit is set to 4.6mA.
Current-Monitor Output. For the MAX15059A, MOUT sources a current equal to IAPD. For the
MAX15059B, MOUT sources a current equal to 1/5 of IAPD.
Clamp Voltage Input. CLAMP is the external potential used for voltage clamping of MOUT.
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