MAX1954AEUB-T Maxim Integrated Products, MAX1954AEUB-T Datasheet - Page 9

• Manufacturer Part Number: MAX1954AEUB-T
• Description: Current Mode PWM Controllers
• Manufacturer: Maxim Integrated Products

Specifications of MAX1954AEUB-T

• Number Of Outputs: 1
• Duty Cycle (max): 93 %
• Output Voltage: 0.8 V to 4.95 V
• Output Current: 25000 mA
• Mounting Style: SMD/SMT
• Package / Case: uSOP-10
• Switching Frequency: 360 KHz
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Synchronous Pin: No
• Topology: Boost, Buck
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Place the high-side MOSFET as close as possible to
the controller and connect HSD and LX to the MOSFET
using Kelvin-sense connections to guarantee current-
sense accuracy and improve stability.
The current-limit circuit employs a lossless, foldback,
valley current-limiting algorithm that uses the low-side
MOSFET’s on-resistance as the sensing element. Once
Figure 1. MAX1954A Typical Application Circuit
Figure 2. MAX1954A Circuit Capable of 20A Output
3V TO 5.5V
0.22 F
560pF
V
C1
C
IN
C
270k
R
15pF
C
C15
C
_______________________________________________________________________________________
F
5.5V TO 13.2V
3V TO 5.5V
Controller with Foldback Current Limit
C
V
IN
COMP
GND
C
HSD
V
MAX1954A
IN
Current-Limit Circuit
HSD
Low-Cost, Current-Mode PWM Buck
R
C
C
PGND
F
BST
DH
DL
LX
FB
C1
HSD
COMP
GND
MAX1954A
C2
D1
C7
0.1 F
IN
N1
N3
PGND
BST
DH
LX
DL
FB
N2
N4
D1
C4
the high-side MOSFET turns off, the voltage across the
low-side MOSFET is monitored. If the voltage across the
low-side MOSFET (R
exceed the current limit, the high-side MOSFET turns on
normally. In this condition, the output drops smoothly out
of regulation. If the voltage across the low-side MOSFET
exceeds the current-limit threshold at the beginning of a
new oscillator cycle, the low-side MOSFET remains on
and the high-side MOSFET remains off.
C3
N1
R3
C14
0.8 H
R3
L1
C6
C2–C6
8.06k
10 F
10k
Typical Application Circuits
L1
R2
R1
R1
R2
DS(ON)
V
10.8V TO 13.2V
C5
HSD
C8–C13
270 F
x I
V
1.8V
OUT
INDUCTOR
V
+1.8V AT 20A
) does not
OUT
9