IC CNTRLR PWM BUCK 10-UMAX

 

MAX1954AEUB+

Manufacturer Part NumberMAX1954AEUB+
DescriptionIC CNTRLR PWM BUCK 10-UMAX
ManufacturerMaxim Integrated Products
TypeStep-Down (Buck)
MAX1954AEUB+ datasheets

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Specifications of MAX1954AEUB+

Internal Switch(s)NoSynchronous RectifierYes
Number Of Outputs1Voltage - Output0.8 ~ 11.35 V
Current - Output25AFrequency - Switching300kHz
Voltage - Input3 ~ 13.2 VOperating Temperature-40°C ~ 85°C
Mounting TypeSurface MountPackage / Case10-MSOP, Micro10™, 10-uMAX, 10-uSOP
Power - Output444mWDuty Cycle (max)93 %
Output Voltage0.8 V to 4.95 VOutput Current25000 mA
Mounting StyleSMD/SMTSwitching Frequency360 KHz
Maximum Operating Temperature+ 85 CMinimum Operating Temperature- 40 C
Synchronous PinNoTopologyBoost, Buck
Lead Free Status / RoHS StatusLead free / RoHS Compliant  
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Download datasheet (350Kb)Embed
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Low-Cost, Current-Mode PWM Buck
Controller with Foldback Current Limit
V
IN
3V TO 5.5V
V
HSD
5.5V TO 13.2V
R
C
C
C
C
Figure 1. MAX1954A Typical Application Circuit
V
IN
3V TO 5.5V
HSD
C1
IN
0.22 F
C15
MAX1954A
R
C
270k
COMP
C
C
C
F
560pF
15pF
PGND
GND
Figure 2. MAX1954A Circuit Capable of 20A Output
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.
Current-Limit Circuit
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
_______________________________________________________________________________________
C1
C2
C3
D1
IN
N1
HSD
BST
DH
C4
MAX1954A
LX
COMP
DL
F
PGND
GND
FB
D1
BST
N1
N2
DH
C7
0.1 F
LX
N3
N4
R3
DL
C14
FB
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.
Typical Application Circuits
L1
V
OUT
1.8V
C5
R1
R3
C6
R2
V
HSD
10.8V TO 13.2V
C2–C6
10 F
L1
0.8 H
R1
10k
C8–C13
270 F
R2
8.06k
x I
DS(ON)
INDUCTOR
V
OUT
+1.8V AT 20A
) does not
9

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