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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX8537 Datasheet

Dual-Synchronous Buck Controllers

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MAX8537 pdf
19-3141; Rev 0; 1/04
EVAALVUAAILTAIOBNLEKIT
Dual-Synchronous Buck Controllers for Point-of-
Load, Tracking, and DDR Memory Power Supplies
General Description
The MAX8537/MAX8539 controllers provide a complete
power-management solution for both double-data-rate
(DDR) and combiner supplies. The MAX8537 and
MAX8539 are configured for out-of-phase and in-phase
DDR power-supply operations, respectively, and gener-
ate three outputs: the main memory voltage (VDDQ), the
tracking sinking/sourcing termination voltage (VTT), and
the termination reference voltage (VTTR). The MAX8538
is configured as a dual out-of-phase controller for point-
of-load supplies. Each buck controller can source or
sink up to 25A of current, while the termination refer-
ence can supply up to 15mA output.
The MAX8537/MAX8538/MAX8539 use constant-
frequency voltage-mode architecture with operating
frequencies of 200kHz to 1.4MHz. An internal high-
bandwidth (25MHz) operational amplifier is used as an
error amplifier to regulate the output voltage. This
allows fast transient response, reducing the number of
output capacitors. An all-N-FET design optimizes effi-
ciency and cost. The MAX8537/MAX8538/MAX8539
have a 1% accurate reference. The second synchro-
nous buck controller in the MAX8537/MAX8539 and the
VTTR amplifier generate 1/2 VDDQ voltage for VTT and
VTTR, and track the VDDQ within ±1%.
This family of controllers uses a high-side current-sense
architecture for current limiting. ILIM pins allow the set-
ting of an adjustable, lossless current limit for different
combinations of load current and RDSON. Alternately,
more accurate overcurrent limit is achieved by using
a sense resistor in series with the high-side FET.
Overvoltage protection is achieved by latching off the
high-side MOSFET and latching on the low-side MOSFET
when the output voltage exceeds 17% of its set output.
Independent enable, power-good, and soft-start features
enhance flexibility.
Applications
DDR Memory Power Supplies
Notebooks and Desknotes
Servers and Storage Systems
Broadband Routers
XDSL Modems and Routers
Power DSP Core Supplies
Power Combiner in Advanced VGA Cards
Networking Systems
RAMBUS Memory Power Supplies
Features
MAX8537/MAX8539: Complete DDR Supplies
MAX8538: Dual Nontracking Controller
Out-of-Phase (MAX8537/MAX8538) or In-Phase
(MAX8539) Operation
4.5V to 23V Wide Input Range (Operate Down to
1.8V Input with External 5V Supply)
Tracking Supply Maintains VTT = VTTR = 1/2 VDDQ
Adjustable Output from 0.8V to 3.6V with 1%
Accuracy
VTTR Reference Sources and Sinks Up to 15mA
200kHz to 1.4MHz Adjustable Switching
Frequency
All-Ceramic Design Achievable
>90% Efficiency
Independent POK_ and EN_
Adjustable Soft-Start and Soft-Stop for Each
Output
Lossless Adjustable-Hiccup Current Limit
Output Overvoltage Protection
28-Pin QSOP Package
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
MAX8537EEI -40°C to +85°C 28 QSOP
MAX8538EEI -40°C to +85°C 28 QSOP
MAX8539EEI -40°C to +85°C 28 QSOP
OPERATION
Out-of-phase
tracking
Out-of-phase
nontracking
In-phase
tracking
Pin Configurations appear at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX8537 Datasheet

Dual-Synchronous Buck Controllers

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MAX8537 pdf
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 = 20k, 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 = 100k, V+ = VL = 5V
RFREQ = 20k, V+ = VL = 5V
RFREQ = 14.3k, V+ = VL = 5V
RFREQ = 100k
RFREQ = 20k
RFREQ = 14.3k
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
4.18 4.3 4.42
V
V
+160
70
mA
°C
180 200 220
µA
-7 -5 -3
357
0.8 or
REFIN
µA
µA
V
160
800
1120
95
80
72
200
1000
1400
240
1200
1680
kHz
kHz
kHz
%
2 _______________________________________________________________________________________


Part Number MAX8537
Description Dual-Synchronous Buck Controllers
Maker Maxim
Total Page 24 Pages
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