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MAX1980ETP
Quick-PWM Slave Controller with Driver Disable for Multiphase DC-DC Converter
General DescriptionThe MAX1980 step-down slave controller is intended for
low-voltage, high-current, multiphase DC-DC applica-
tions. The MAX1980 slave controller can be combined
with any of Maxim’s Quick-PWM™step-down controllers
to form a multiphase DC-DC converter. Existing Quick-
PWM controllers, such as the MAX1718, function as the
master controller, providing accurate output-voltage regu-
lation, fast transient response, and fault protection fea-
tures. Synchronized to the master’s low-side gate driver,
the MAX1980 includes the Quick-PWM constant on-time
controller, gate drivers for a synchronous rectifier, active
current balancing, and precision current-limit circuitry.
The MAX1980 provides the same high-efficiency, ultra-
low duty factor capability, and excellent transient
response as other Quick-PWM controllers. The MAX1980
differentially senses the inductor currents of both the
master and the slave across current-sense resistors.
These differential inputs and the adjustable current-limit
threshold derived from an external reference allow the
slave controller to accurately balance the inductor cur-
rents and provide precise current-limit protection. The
MAX1980’s dual-purpose current-limit input also allows
the slave controller to automatically enter a low-power
standby mode when the master controller shuts down.
The MAX1980 features a driver-disable mode that forces
both gate drivers (DL and DH) low. While the MAX1980’s
drivers are disabled, the master controller can operate in
low-power skip mode, improving light-load efficiency.
Additionally, the MAX1980 includes selectable trigger
polarity, allowing the slave controller to trigger on the ris-
ing (out-of-phase) or falling (in-phase) edge of the mas-
ter’s low-side gate driver. Out-of-phase operation
staggers the master and slave’s on-times, reducing the
input ripple current and consequently the number of
input capacitors. The MAX1980 also features a selec-
table 200kHz/300kHz/550kHz switching frequency. The
MAX1980 is available in compact 20-pin 5mm ✕5mm
QFN and thin QFN packages.
ApplicationsNotebook Computers
CPU Core Supply
Single-Stage (BATT to VCORE) Converters
Two-Stage (5V to VCORE) Converters
Servers/Desktop Computers
FeaturesQuick-PWM Slave ControllerPrecise, Active Current Balance (±1.25mV )Driver Disable Improves Light Load EfficiencyAccurate, Adjustable Current-Limit ThresholdOptimized for Low-Output Voltages (≤2V)4V to 28V Battery Input RangeSelectable 200kHz/300kHz/550kHz Switching
FrequencyDrive Large Synchronous-Rectifier MOSFETs525µA (typ) ICCSupply Current20µA Standby Supply CurrentCompact 20-Pin 5mm ✕5mm QFN and Thin QFN
Packages
MAX1980
Quick-PWM Slave Controller with
Driver Disable for Multiphase DC-DC Converter
Pin Configuration19-2298; Rev 2; 9/02
Ordering Information
Typical Operating Circuit appears at end of data sheet.Quick-PWM is a trademark of Maxim Integrated Products, Inc.
*Contact factory for availability.
MAX1980
Quick-PWM Slave Controller with
Driver Disable for Multiphase DC-DC Converter
ABSOLUTE MAXIMUM RATINGSStresses 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.
V+ to GND..............................................................-0.3V to +30V
VCC, VDDto GND.....................................................-0.3V to +6V
PGND to GND.....................................................................±0.3V
TRIG, LIMIT to GND.................................................-0.3V to +6VDDto GND...............................................................-0.3V to +6V
ILIM, CM+, CM-, CS+, CS-, COMP
to GND....................................................-0.3V to (VCC+ 0.3V)
TON, POL to GND......................................-0.3V to (VCC+ 0.3V)
DL to PGND................................................-0.3V to (VDD+ 0.3V)
BST to GND............................................................-0.3V to +36V
DH to LX....................................................-0.3V to (VBST+ 0.3V)
LX to BST..................................................................-6V to +0.3V
Continuous Power Dissipation (TA= +70°C)
20-Pin QFN (derate 20.0mW/°C above +70°C).............1.60W
Operating Temperature Range.........................-40°C to +100°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
ELECTRICAL CHARACTERISTICS(Circuit of Figure 1, V+ = 15V, VCC= VDD= 5V, VOUT= VCOMP= 1.2V, VCM+= VCM-= VCS+= VCS-= 1.2V, DD= VCC, TA
= 0°C to
+85°C, unless otherwise noted. Typical values are at TA= +25°C.)
MAX1980
Quick-PWM Slave Controller with
Driver Disable for Multiphase DC-DC Converter
ELECTRICAL CHARACTERISTICS (continued)(Circuit of Figure 1, V+ = 15V, VCC= VDD= 5V, VOUT= VCOMP= 1.2V, VCM+= VCM-= VCS+= VCS-= 1.2V, DD= VCC , TA
= 0°C to
+85°C, unless otherwise noted. Typical values are at TA= +25°C.)
MAX1980
Quick-PWM Slave Controller with
Driver Disable for Multiphase DC-DC Converter
ELECTRICAL CHARACTERISTICS(Circuit of Figure 1, V+ = 15V, VCC= VDD= 5V, VOUT= VCOMP= 1.2V, VCM+= VCM-= VCS+= VCS-= 1.2V, DD= VCC, TA
= -40°C
to +100°C, unless otherwise noted.) (Note 5)
ELECTRICAL CHARACTERISTICS (continued)(Circuit of Figure 1, V+ = 15V, VCC= VDD= 5V, VOUT= VCOMP= 1.2V, VCM+= VCM-= VCS+= VCS-= 1.2V, DD= VCC , TA
= 0°C to
+85°C, unless otherwise noted. Typical values are at TA= +25°C.)
MAX1980
Quick-PWM Slave Controller with
Driver Disable for Multiphase DC-DC Converter
ELECTRICAL CHARACTERISTICS (continued)(Circuit of Figure 1, V+ = 15V, VCC= VDD= 5V, VOUT= VCOMP= 1.2V, VCM+= VCM-= VCS+= VCS-= 1.2V, DD= VCC , TA
= -40°C
to +100°C, unless otherwise noted.) (Note 5)
Note 1:On-time specifications are measured from 50% point to 50% point at the DH pin with LX = PGND, VBST= 5V, and a 500pF
capacitor from DH to LX to simulate external MOSFET gate capacitance. Actual in-circuit times may be different due to
MOSFET switching speeds.
Note 2:The trigger delay time, tTRIG, is measured from the time the TRIG pin transitions to the time when the DL pin goes low.
Note 3:Production testing limitations due to package handling require relaxed maximum on-resistance specifications for the QFN
package.
Note 4:The driver-disable delay time (tDD) is measured from the time the DDpin transitions to the time when the DL or DH pin tran-
sitions.
Note 5:Specifications to -40°C and +100°C are guaranteed by design and not production tested.
