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
SHUTDOWN
COMPARATOR
0.5V
COMP
2.36V
CLAMP
ERROR
AMPLIFIER
FB
REFERENCE
AND
SOFT-START
DIGITAL-TO-ANALOG
CONVERTER
FOLDBACK CURRENT-
During the second half of the cycle, the high-side
MOSFET turns off and the low-side MOSFET turns on. The
inductor releases the stored energy as the current ramps
down, providing current to the output. The output capaci-
tor stores charge when the inductor current exceeds the
required load current and discharges when the inductor
current is lower, smoothing the voltage across the load.
Under overload conditions, when the inductor current
exceeds the current limit (see the Current-Limit Circuit
section), the high-side MOSFET is not turned on at the ris-
ing clock edge and the low-side MOSFET remains on to
let the inductor current ramp down.
8
_______________________________________________________________________________________
THERMAL
UVLO
LIMIT
SLOPE
COMPENSATION
PWM
CONTROL
CIRCUITRY
SHORT-CIRCUIT
CURRENT-LIMIT
CIRCUITRY
CLOCK
LIMIT CIRCUITRY
GND
The MAX1954A operates in a forced-PWM mode; there-
fore, the controller maintains a constant switching fre-
quency, regardless of load, to allow for easier post-
filtering of the switching noise.
The current-sense circuit amplifies the current-sense
voltage (the high-side MOSFET’s on-resistance
(R
) multiplied by the inductor current). This ampli-
DS(ON)
fied current-sense signal and the internal slope-compen-
sation signal are summed (V
the PWM comparator’s inverting input. The PWM com-
parator shuts off the high-side MOSFET when V
exceeds the integrated feedback voltage (V
Functional Diagram
IN
MAX1954A
HSD
BST
DH
CURRENT-
LX
SENSE
IN
CIRCUITRY
DL
CURRENT-LIMIT
COMPARATOR
PGND
Current-Sense Amplifier
) together and fed into
SUM
SUM
).
COMP

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