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MAX8529 数据表(PDF) 6 Page - Maxim Integrated Products

部件名 MAX8529
功能描述  1.5MHz Dual 180째 Out-of-Phase PWM Step-Down Controller with POR
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制造商  MAXIM [Maxim Integrated Products]
网页  https://www.maximintegrated.com/en.html
标志 MAXIM - Maxim Integrated Products

MAX8529 数据表(HTML) 6 Page - Maxim Integrated Products

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1.5MHz Dual 180° Out-of-Phase
PWM Step-Down Controller with POR
6
_______________________________________________________________________________________
Pin Description
PIN
NAME
FUNCTION
1
COMP2
Compensation Pin for Regulator 2 (REG2). Compensate REG2’s control loop as shown in Figure 1.
2
FB2
Feedback Input for Regulator 2 (REG2). Connect FB2 to a resistive-divider between REG2’s output
and GND to adjust the output voltage between 1V and 18V. To set the output voltage below 1V,
connect FB2 to a resistive voltage-divider from REF to REG2’s output (see the Setting the Output
Voltage section).
3
ILIM2
Current-Limit Adjustment for Regulator 2 (REG2). The PGND–LX2 current-limit threshold defaults to
100mV if ILIM2 is connected to VL. Connect a resistor (RILIM2) from ILIM2 to GND to adjust the
REG2’s current-limit threshold (VITH2) from 50mV (RILIM2 = 100k
Ω) to 300mV (RILIM2 = 600kΩ) (see
the Setting the Valley Current Limit section).
4
OSC
Oscillator Frequency Set Input. The controller generates the clock signal by dividing down the
oscillator, so the switching frequency equals half the synchronization frequency (fSW = fOSC / 2).
Connect a resistor from OSC to GND (ROSC) to set the switching frequency from 600kHz (ROSC =
10k
Ω) to 1500kHz (ROSC = 4kΩ). The controller still requires ROSC when an external clock is
connected to SYNC. When using SYNC, set ROSC for one half of the SYNC input.
5
V+
Input Supply Voltage (4.75V to 23V)
6
REF
2V Reference Output. Bypass to GND with a 0.22µF or greater ceramic capacitor.
7
GND
Analog Ground
8
CKO
Clock Output. Clock Output for external 2- or 4-phase synchronization (see the Clock Synchronization
(SYNC, CKO) section).
9
SYNC
Synchronization Input or Clock Output Selection Input. SYNC has three operating modes. Connect
SYNC to a 1200kHz to 2800kHz clock for external synchronization. Connect SYNC to GND for 2-
phase operation as a master controller. Connect SYNC to VL for 4-phase operation as a master
controller (see the Clock Synchronization (SYNC, CKO) section).
10
ILIM1
Current-Limit Adjustment for Regulator 1 (REG1). The PGND–LX1 current-limit threshold defaults to
100mV if ILIM1 is connected to VL. Connect a resistor (RILIM1) from ILIM1 to GND to adjust REG1’s
current-limit threshold (VITH1) from 50mV (RILIM1 = 100k
Ω) to 300mV (RILIM1 = 600kΩ) (see the
Setting the Valley Current Limit section).
11
FB1
Feedback Input for Regulator 1 (REG1). Connect FB1 to a resistive-divider between REG1’s output
and GND to adjust the output voltage between 1V and 18V. To set the output voltage below 1V,
connect FB1 to a resistive voltage-divider from REF and REG1’s output (see the Setting the Output
Voltage section).
12
COMP1
Compensation Pin for Regulator 1 (REG1). Compensate REG1’s control loop as shown in Figure 1.
13
RST
Open-Drain Reset Output.
RST is low when either output voltage is more than 10% below its
regulation point. After soft-start is completed and both outputs exceed 90% of their nominal output
voltage (VFB_ > 0.9V), RST becomes high impedance after a 140ms delay and remains high
impedance as long as both outputs maintain regulation. Connect a resistor between
RST and the
logic supply for logic-level voltages.


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