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| MAX1536 Datasheet, PDF (11/19 Pages) Maxim Integrated Products – 3.6A, 1.4MHz, Low-Voltage, Internal-Switch Step-Down Regulator with Dynamic Output Voltage Control | |||
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3.6A, 1.4MHz, Low-Voltage, Internal-Switch Step-
Down Regulator with Dynamic Output Voltage Control
Table 2. Component Manufacturers
SUPPLIER
Coilcraft
Coiltronics
Kemet
Sanyo
Sumida
COMPONENT
Inductors
Inductors
Capacitors
Capacitors
Inductors
Taiyo Yuden
Capacitors
TDK
TOKO
Capacitors
Inductors
PHONE
800-322-2645 (USA)
561-752-5000 (USA)
408-986-0424 (USA)
818-998-7322 (USA)
408-982-9660 (USA)
03-3667-3408 (Japan),
408-573-4150 (USA)
847-803-6100 (USA),
81-3-5201-7241 (Japan)
858-675-8013 (USA)
WEBSITE
www.coilcraft.com
www.coiltronics.com
www.kemet.com
www.sanyo.com
www.sumida.com
www.t-yuden.com
www.component.tdk.com
www.toko.com
PGOOD
REF
PGOOD
COMPARATOR
REFIN
OD
VCC
COMP
MAX1536
SHDN
Gm
SUMMING
COMPARATOR
CURRENT
SENSE
PWM LOGIC
FB
AND
OD
DRIVERS
FBLANK
DECODE AND
TIMER
TIMER
CURRENT
2.0V
SENSE
REF
GATE
FBLANK
REF
AGND
TOFF
SKIP
VCC
*FB
IN
VIN
CIN
VIN
+3.0V TO +5.5V
L
LX
PGND
VOUT
+0.7V TO VIN
COUT
*FOR VOUT > 2.0V, USE AN FB RESISTIVE DIVIDER
*FROM VOUT TO AGND.
Figure 2. MAX1536 Functional Diagram
extended off-time to control the current. Operation dur-
ing a short-circuit or overload is similar to forced-PWM
mode except the off-time is 4 Ã tOFF. At the end of each
off-time, the PMOS switch turns on and remains on until
the output is in regulation or the current through the
switch increases to the 4.8A current limit. When the
PMOS switch turns off, it remains off for four times the
programmed off-time (tOFF), and the NMOS synchro-
nous switch turns on. Since either the NMOS or the
PMOS switch is always on, the inductor current is con-
tinuous. The RMS inductor current during a short circuit
remains below the 4.8A current-limit threshold. The
MAX1536 operates using the extended off-time until the
short-circuit or overload is removed and VFB > 0.3 Ã
VREFIN. Prolonged short circuit or overload can result in
thermal shutdown.
______________________________________________________________________________________ 11
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