MAX8537 View Datasheet(PDF) - Maxim Integrated
Part Name
Description
Manufacturer
MAX8537
Maxim Integrated
MAX8537 Datasheet PDF : 23 Pages
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Dual-Synchronous Buck Controllers for Point-of-
Load, Tracking, and DDR Memory Power Supplies
ABSOLUTE MAXIMUM RATINGS
V+ to GND ..............................................................-0.3V to +25V
AVL, VL to GND........................................................-0.3V to +6V
PGND to GND .......................................................-0.3V to +0.3V
FB_, EN_, POK_ to GND...........................................-0.3V to +6V
REFIN, VTTR, FREQ, SS_, COMP_ to GND....-0.3V to (AVL + 0.3V)
BST_, ILIM_ to GND ...............................................-0.3V to +30V
DH1 to LX1 ...............................................-0.3V to (BST1 + 0.3V)
DH2 to LX2 ...............................................-0.3V to (BST2 + 0.3V)
LX_ to BST_ ..............................................................-6V to +0.3V
LX_ to GND................................................................-2V to +25V
DL_ to PGND ................................................-0.3V to (VL + 0.3V)
Continuous Power Dissipation (TA = +70°C)
28-Pin QSOP (derate 10.8mW/°C above +70°C)........860mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) ..........................……+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V+ = 12V, EN_ = VL, BST_ = 6V, LX_ = 1V, VL load = 0mA, CVL = 10µF (ceramic), REFIN = 1.25V, PGND = AGND = FB_ = ILIM_ =
0V, CSS = 10nF, CVTTR = 1µF, RFREQ = 20kΩ, DH_ = open, DL_ = open, POK_ = open, circuit of Figure 1, TA = 0°C to +85°C, unless
otherwise noted.)
PARAMETER
GENERAL
V+ Operating Range
V+/ VL Operating Range
V+ Operating Supply Current
V+ Standby Supply Current
VL REGULATOR
Output Voltage
VL Undervoltage-Lockout Trip
Level
CONDITIONS
VL regulator drops out below 5.5V (Note 1)
VL is externally generated (Note 1)
IL(VL) = 0, FB_ forced 50mV above threshold
IL(VL) = 0, BST_ = VL, EN = LX_ = FB_ = 0V
5.5V < V+ < 23V, 1mA < ILOAD < 70mA
Rising edge, hysteresis = 550mV (typ) (trip level is
typically 85% of VL)
Output Current
This is for gate current of DL_ /DH_ drivers, C(VL) =
1µF/10mA ceramic capacitor
Thermal Shutdown
Rising temperature, typical hysteresis = 10°C
CURRENT-LIMIT THRESHOLD (all current limits are tested at V+ = VL = 4.5V and 5.5V)
ILIM Sink Current
ILIM_ = LX - 200mV, 1.8V < LX < 23V, BST = LX +5V
SOFT-START
Soft-Start Source Current
SS_ = 100mV
Soft-Start Sink Current
SS_ = 0.8 or REFIN
Soft-Start Full-Scale Voltage
FREQUENCY
Low End of Range
Intermediate Range
High End of Range
Maximum Duty Cycle
RFREQ = 100kΩ, V+ = VL = 5V
RFREQ = 20kΩ, V+ = VL = 5V
RFREQ = 14.3kΩ, V+ = VL = 5V
RFREQ = 100kΩ
RFREQ = 20kΩ
RFREQ = 14.3kΩ
MIN TYP MAX UNITS
4.5
23.0
V
4.5
5.5
V
3.5
7
mA
350
700
µA
4.75
5
5.25
V
4.18
4.3
4.42
V
70
mA
+160
°C
180
200
220
µA
-7
-5
-3
µA
3
5
7
µA
0.8 or
V
REFIN
160
200
240
kHz
800 1000 1200 kHz
1120 1400 1680 kHz
95
80
%
72
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