MAX1858AEEG+ Maxim Integrated Products, MAX1858AEEG+ Datasheet - Page 8

• 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

With dual, synchronized, out-of-phase operation, the
MAX1858A/MAX1875A/MAX1876As’ high-side MOSFETs
turn on 180° out-of-phase. The instantaneous input cur-
rent peaks of both regulators no longer overlap, resulting
in reduced RMS ripple current and input voltage ripple.
This reduces the required input capacitor ripple-current
rating, allowing fewer or less expensive capacitors, and
reduces shielding requirements for EMI. The Out-of-
Phase Waveforms in the Typical Operating Charac-
teristics demonstrate synchronized 180° out-of-phase
operation.
Dual 180° Out-of-Phase Buck Controllers with
Sequencing/Prebias Startup and POR
Figure 1. Standard 600kHz Application Circuit
8
V
OUTPUT1
OUT
4 × 220µF
_______________________________________________________________________________________
= 1.8V
C
OUT1
6V - 23V
2 × 10µF
V
IN
R1A
8.06kΩ
R1B
10kΩ
C
IN1
1.1µH
L1
C
COMP1A
0.01µF
**
CLOCK OUTPUT
RESET OUTPUT
N
N
ON
H1*
L1*
CMSSH-3
R
5.9kΩ
OFF
COMP1
0.22µF
4.7Ω
D2
C
R
V+
V+
C
COMP1B
100pF
C
0.1µF
10kΩ
4.7Ω
BST1
V+
BST1
DH1
LX1
DL1
PGND
FB1
COMP1
OSC
CKO
RST (MAX1858A/
MAX1876A ONLY)
EN
MAX1858A
MAX1875A
MAX1876A
84.5kΩ
All MAX1858A/MAX1875A/MAX1876A functions are
internally powered from an on-chip, low-dropout 5V
regulator. The maximum regulator input voltage (V+) is
23V. Bypass the regulator’s output (V
ceramic capacitor to PGND. The V
typically 500mV, so when V+ is greater than 5.5V, V
typically 5V. The MAX1858A/MAX1875A/MAX1876A
also employs an undervoltage lockout circuit that dis-
ables both regulators when V
should also be bypassed to GND with a 0.1µF capaci-
tor. When V
latched and V
normal operation can resume.
COMP2
SYNC
ILIM1
ILIM2
BST2
DH2
GND
LX2
DL2
FB2
REF
V
L
4.7Ω
CMPSH-3A
96.5kΩ
C
0.1µF
140kΩ
BST2
C
100pF
COMP2B
L
Internal 5V Linear Regulator (V
C
0.22µF
REF
falls and UVLO is tripped, the device is
L
must be discharged below 2.5V before
V
CMSSH-3
L
R
8.2kΩ
COMP2
D3
4.7µF
C
VL
**OPTIONAL
118kΩ
*IRF7811W
N
N
H2*
L2*
0.1µF
C
6800pF
COMP2A
**
L
C
2 × 10µF
falls below 4.2V. V
1.1µH
IN2
L
L2
10kΩ
dropout voltage is
15kΩ
R2B
R2A
L
) with a 4.7µF
OUTPUT2
V
OUT
C
4 × 220µF
OUT2
= 2.5V
L
L
is
L
)