IC CTRLR PWM STP-DN TRIPL 32WQFN

MAX15048ETJ+

Manufacturer Part NumberMAX15048ETJ+
DescriptionIC CTRLR PWM STP-DN TRIPL 32WQFN
ManufacturerMaxim Integrated Products
MAX15048ETJ+ datasheet
 


Specifications of MAX15048ETJ+

ApplicationsPower Supply Controller, SequencerVoltage - Supply4.7 V ~ 23 V
Current - Supply6mAOperating Temperature-40°C ~ 85°C
Mounting TypeSurface MountPackage / Case32-WQFN Exposed Pad
Number Of Outputs3Output Voltage5 V
Input Voltage4.7 V to 23 VSupply Current6 mA
Switching Frequency200 KHzMounting StyleSMD/SMT
Maximum Operating Temperature+ 85 CMinimum Operating Temperature- 40 C
Lead Free Status / RoHS StatusLead free / RoHS CompliantVoltage - Input-
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Triple-Output Buck Controllers
with Tracking/Sequencing
MAX15049 Output-Voltage
Sequencing (EN_)
In Figure 1c, when sequencing, the enable input must be
above 0.6V for each PWM controller to start. The V
outputs and EN_ inputs can be daisy-chained to gener-
ate power sequencing. See Figure 2 and the Typical
Operating Characteristics (V
OUT_
Alternately, connect a resistive voltage-divider from the
voltage to be sequenced from the enable input to SGND
to set when each controller should start.
The output of the internal transconductance error ampli-
fier (COMP_) is provided for frequency compensation
(see the Compensation Design Guidelines section). FB_
is the inverting input and COMP_ is the output of the error
RATIOMETRIC
TRACKING
V
IN
EN1
EN2
EN3
MAX15048
Figure 2. Ratiometric Tracking, Coincident Tracking (MAX15048), and Sequencing (MAX15049) Configurations
18
_____________________________________________________________________________________
amplifier. The error transamplifier has an 80dB open-
loop gain and a 10MHz GBW product. See the Typical
Operating Characteristics for a plot of gain and phase
vs. frequency.
OUT_
to EN_ Sequencing).
The current-limit circuit employs a valley current-limiting
algorithm that uses the synchronous MOSFET’s on-
resistance as the current-sensing element. The current-
limit threshold is internally set at 69mV (typ). Once the
Error Amplifier
high-side MOSFET turns off, the voltage across the
current-sensing element is monitored. If this voltage
does not exceed the current-limit threshold, the high-
side MOSFET turns on normally at the start of the next
cycle. If the voltage exceeds the current-limit threshold
COINCIDENT
TRACKING
V
IN
EN1
V
OUT1
R
A
EN2
EN3
R
B
V
V
OUT3
OUT2
R
A
FB2
FB3
R
B
MAX15048
Output Short-Circuit
Protection (Hiccup Mode)
SEQUENCING
V
IN
EN1
V
EN2
OUT1
R
C
R
D
V
EN3
OUT2
R
C
R
D
MAX15049