MAX1858AEEG+ Maxim Integrated Products, MAX1858AEEG+ Datasheet - Page 6

• Manufacturer Part Number: MAX1858AEEG+
• Description: IC CNTRLR BUCK DUAL 24-QSOP
• Manufacturer: Maxim Integrated Products
• Type: Step-Down (Buck)r

Specifications of MAX1858AEEG+

• Internal Switch(s): No
• Synchronous Rectifier: No
• Number Of Outputs: 2
• Voltage - Output: 0 ~ 18 V
• Current - Output: 10A
• Frequency - Switching: 100kHz ~ 600kHz
• Voltage - Input: 4.5 ~ 23 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-QSOP
• Power - Output: 762mW
• Output Voltage: 0 V to 18 V
• Output Current: 10 A
• Input Voltage: 4.5 V to 23 V
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Dual 180° Out-of-Phase Buck Controllers with
Sequencing/Prebias Startup and POR
6
PIN
10
11
12
13
1
2
3
4
5
6
7
8
9
_______________________________________________________________________________________
COMP2
COMP1
NAME
SYNC
ILIM2
ILIM1
OSC
GND
CKO
N.C.
REF
RST
FB2
FB1
V+
Compensation Pin for Regulator 2 (REG2). Compensate REG2’s control loop by connecting a series resistor
(R
shown in Figure 1.
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.
Current-Limit Adjustment for Regulator 2 (REG2). The PGND–LX2 current-limit threshold defaults to 100mV if
ILIM2 is connected to V
threshold (V
Limit section.
Oscillator Frequency Set Input. Connect a resistor from OSC to GND (R
100kHz (R
connected to SYNC. When using an external clock, select R
frequency to twice the desired switching frequency.
Input Supply Voltage. 4.5V to 23V.
2V Reference Output. Bypass to GND with a 0.22µF or greater ceramic capacitor.
Analog Ground
Clock Output. Clock output for external 2- or 4-phase synchronization (see the Clock Synchronization (SYNC,
CKO) section).
Synchronization Input or Clock Output Selection Input. SYNC has three operating modes. Connect SYNC to a
200kHz to 1200kHz clock for external synchronization. Connect SYNC to GND for 2-phase operation as a master
controller. Connect SYNC to V
(SYNC, CKO) section).
Current-Limit Adjustment for Regulator 1 (REG1). The PGND–LX1 current-limit threshold defaults to 100mV if
ILIM1 is connected to V
(V
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.
Compensation Pin for Regulator 1 (REG1). Compensate REG1’s control loop by connecting a series resistor
(R
shown in Figure 1.
Open-Drain Reset Output (MAX1858A/MAX1876A Only). 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 (V
as both outputs maintain regulation. Connect a resistor between RST and the logic supply for logic-level
voltages.
Connect to GND or leave unconnected for the MAX1875A.
ITH1
COMP2
COMP1
) from 50mV (R
) and capacitor (C
) and capacitor (C
FB
OSC
ITH2
_ > 0.9V), RST becomes high impedance after a 140ms delay and remains high impedance as long
= 60kΩ) to 600kHz (R
) from 50mV (R
ILIM1
L
L
. Connect a resistor (R
. Connect a resistor (R
= 100kΩ) to 300mV (R
COMP2A
COMP1A
L
ILIM2
for 4-phase operation as a master controller (see the Clock Synchronization
) to GND in parallel with a second compensation capacitor (C
) to GND in parallel with a second compensation capacitor (C
= 100kΩ) to 300mV (R
OSC
= 10kΩ). The controller still requires R
ILIM2
ILIM1
ILIM1
FUNCTION
) from ILIM2 to GND to adjust the REG2’s current-limit
) from ILIM1 to GND to adjust REG1’s current-limit threshold
= 600kΩ). See the Setting the Valley Current Limit section.
ILIM2
OSC
= 600kΩ). See the Setting the Valley Current
as described above, and set the external clock
OSC
) to set the switching frequency from
OSC
when an external clock is
Pin Description
COMP2B
COMP1B
) as
) as