MAX16975 查看數據表（PDF） - Maxim Integrated
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MAX16975 Datasheet PDF : 17 Pages
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MAX16975
28V, 1.2A Automotive Step-Down Converter
with Low Operating Current
Pin Configurations
TOP VIEW
+
CRES 1
FOSC 2
FSYNC 3
I.C. 4
MAX16975A
COMP 5
FB 6
OUT 7
EP
GND 8
QSOP
16 RESETI
15 RES
14 EN
13 SUPSW
12 LX
11 SUP
10 BST
9 BIAS
TOP VIEW
+
CRES 1
FOSC 2
FSYNC 3
I.C. 4
MAX16975B
COMP 5
FB 6
OUT 7
GND 8
QSOP
16 RESETI
15 RES
14 EN
13 SUPSW
12 LX
11 SUP
10 BST
9 BIAS
Pin Description
PIN NAME
FUNCTION
Analog Reset Timer. CRES sources 10FA (typ) of current into an external capacitor to set the reset timeout
1
CRES period. Reset timeout period is defined as the time between the start of output regulation and RES switch-
ing to high impedance. Leave CRES unconnected for minimum delay time.
2
FOSC
Resistor-Programmable Switching Frequency Control Input. Connect a resistor from FOSC to GND to set
the switching frequency (see the Internal Oscillator section).
3
FSYNC
Synchronization Input. The device synchronizes to an external signal applied to FSYNC. The external signal
period must be 10% shorter than the internal clock period for proper operation.
4
I.C. Internally Connected. Connect to GND.
5
COMP
Error-Amplifier Output. Connect a compensation network from COMP to GND for stable operation. See the
Compensation Network section.
Feedback Input. Connect an external resistive divider from FB to OUT and GND to set the output voltage
6
FB between 1V and 10V. Connect FB directly to BIAS to set the output voltage to 5V. See the Applications
Information section.
Connect OUT to the output of the converter. OUT provides power to the internal circuitry when the output
7
OUT voltage of the converter is set between 3V and 5.6V. During shutdown, OUT is pulled to GND with a 50I
resistor.
8
GND Ground
9
BIAS
Linear Regulator Output. BIAS powers the internal circuitry. Bypass BIAS with a 1FF capacitor to ground as
close as possible to the device. During shutdown, BIAS is actively discharged through a 32kI resistor.
10
BST High-Side Driver Supply. Connect a 0.1FF capacitor between LX and BST for proper operation.
11
SUP
Voltage Supply Input. SUP powers the internal linear regulator. Connect a 4.7FF capacitor from SUP to
ground. Connect SUP to SUPSW.
12
LX
Inductor Connection. Connect a rectifying Schottky diode between LX and GND. Connect an inductor from
LX to the output.
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