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MAX1980ETP+-MAX1980ETP-T
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 Converter191817168910
QFN/THIN QFN
5mm x 5mmTOP VIEW
MAX1980CM+
CM-
TON
CS-
CS+
VCC
VDD
PGND
GND
POL
COMP
TRIGILIMLIMITV+BST
Pin Configuration19-2298; Rev 2; 9/02
Ordering Information
PARTTEMP RANGEPIN-PACKAGEMAX1980EGP*-40°C to +100°C20 QFN (5mm x 5mm)
MAX1980ETP-40°C to +100°C20 Thin QFN
(5mm x 5mm)
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 +6Vto 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.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
PWM CONTROLLERBattery voltage, V+4.028Input Voltage RangeVCC, VDD4.55.5V
TON = GND171190209
TON = open320355390On-Time (Note 1)tONV+ = 12V,
VCOMP = 1.2V
TON = VCC464515566
Trigger Delay (Note 2)tTRIG75ns
SUPPLY CURRENTSQuiescent Supply Current (V+)I+Measured at V+; VILIM > 0.35V2540µA
Quiescent Supply Current (VDD)IDDMeasured at VDD; VILIM > 0.35V<15µA
Quiescent Supply Current (VCC)ICCMeasured at VCC; VILIM > 0.35V525800µA
Standby Supply Current (V+)Measured at V+; ILIM = GND<15µA
Standby Supply Current (VDD)Measured at VDD; ILIM = GND<15µA
Standby Supply Current (VCC)Measured at VCC; ILIM = GND2040µAr i ver - D i sab l e S up p l y C ur r ent ( V + ) Measured at V+; DD = GND, VILIM > 0.35V2540µA
Driver-Disable Supply Current
(VDD)Measured at VDD; DD = GND, VILIM > 0.35V<15µA
Driver-Disable Supply Current
(VCC)Measured at VCC; DD = GND, VILIM > 0.35V525800µA
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.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
CURRENT SENSINGOn-Time Adjustment Range0.42V < VCOMP < 2.8V, VOUT ≥ 0.7V-40+40%
COMP Output CurrentICOMPSink and source30µA
Current-Balance Offset(VCM+ - VCM-) - (VCS+ - VCS-), ICOMP = 0,
-100mV ≤ (VCM+ - VCM-) ≤ +100mV-1.25+1.25mV
Current-Balance
Transconductance(VCM+ - VCM-) - (VCS+ - VCS-) = ±25mV1.2mS
Current-Sense, Common-Mode
RangeCM+, CM-, CS+, CS--0.2+2.0V
Current-Sense Input CurrentCM+, CM-, CS+, CS--11µA
VILIM = 0.5V47.55052.5Positive Current-Limit ThresholdVC_LIMVCM+ - VCM- and
VCS+ - VCS-VILIM = 1V97.5100102.5mV
VILIM = 0.5V-80-75-70Negative Current-Limit
ThresholdVCS+ - VCS-VILIM = 1V-160-150-140mV
ILIM Standby Threshold Voltage0.20.3V
ILIM Input Current-100100nA
LIMIT Propagation DelaytLIMITFalling edge, 3mV over trip threshold1.5µs
LIMIT Output Low VoltageVOL(LIMIT)ISINK = 1mA0.1V
LIMIT Leakage CurrentILIMITLIMIT forced to 5.5V< 0.011µA
FAULT PROTECTIONVCC Undervoltage Lockout
Threshold
Rising edge, hysteresis = 20mV, switching
disabled below this level3.453.85V
Thermal-Shutdown ThresholdRising, hysteresis = 15°C (typ)160°C
GATE DRIVERSDH Gate-Driver On-Resistance
(Note 3)RON ( D H ) VBST - VLX forced to 5V1.04.5Ω
High state (pullup)1.04.5DL Gate-Driver On-Resistance
(Note 3)RON(DL)Low state (pulldown)0.42.0Ω
DH Gate-Driver Source/Sink
CurrentIDHDH forced to 2.5V, VBST - VLX forced to 5V1.3A
DL Gate-Driver Sink CurrentIDLDL forced to 2.5V4.0A
DL Gate-Driver Source CurrentIDLDL forced to 2.5V1.3A
DL rising35Dead TimeDH rising26ns
DD falling (Note 4)2251000Driver Disable DelaytDDDD rising (Note 4)651000ns
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)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
PWM CONTROLLERTON = GND (550kHz)171209
TON = open (300kHz)320390On Time (Note 1)tONV+ = 12V,
VCOMP = 1.2V
TON = VCC (200kHz)464566
SUPPLY CURRENTSQuiescent Supply Current (V+)I+Measured at V+; VILIM > 0.35V40µA
Quiescent Supply Current (VDD)IDDMeasured at VDD; VILIM > 0.35V,
TA = -40°C to +85°C5µA
Quiescent Supply Current (VCC)ICCMeasured at VCC; VILIM > 0.35V800µA
Standby Supply Current (V+)Measured at V+; ILIM = GND,
TA = -40°C to +85°C5µA
Standby Supply Current (VDD)Measured at VDD; ILIM = GND,
TA = -40°C to +85°C5µA
Standby Supply Current (VCC)Measured at VCC; ILIM = GND40µA
Driver-Disable Supply Current
(V+)Measured at V+; DD = GND, VILIM > 0.35V40µA
Driver-Disable Supply Current
(VDD)
Measured at VDD; DD = GND, VILIM >
0.35V, TA = -40°C to +85°C5µA
Driver-Disable Supply Current
(VCC)Measured at VCC; DD = GND, VILIM > 0.35V800µA
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.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
LOGICHigh2.4POL Logic LevelsVPOLVCC = 4.5V to 5.5VLow0.8V
High2.4DD Logic LevelsVDDVCC = 4.5V to 5.5V
265mV hysteresisLow0.6V
High3.0TRIG Logic LevelsVTRIG350mV hysteresisLow1.2V
Logic high (VCC; 200kHz operation)VCC - 0.4
Open (300kHz operation)1.63.1TON Logic LevelsVTON
Logic low (GND; 550kHz operation)0.5
TRIG-1+1-1+1
POL-2+1Logic Input Current
TON = GND or VDD-2+3
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)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
CURRENT SENSINGOn-Time Adjustment Range0.42V < VCOMP < 2.8V, VOUT ≥ 0.7V-40+40%
COMP Output CurrentICOMPSink and source30µA
Current-Balance Offset(VCM+ - VCM-) - (VCS+ - VCS-), ICOMP = 0,
-100mV ≤ (VCM+ - VCM-) ≤ +100mV-2.0+2.0mV
Current-Sense, Common-Mode
RangeCM+, CM-, CS+, CS--0.2+2.0V
VILIM = 0.5V47.552.5Positive Current-Limit ThresholdVC_LIMVCM+ - VCM- and
VCS+ - VCS-VILIM = 1V97103mV
VILIM = 0.5V-80-70Negative Current-Limit
ThresholdVCS+ - VCS-VILIM = 1V-160-140mV
ILIM Standby Threshold Voltage0.20.3V
FAULT PROTECTIONVCC Undervoltage Lockout
Threshold
Rising edge, hysteresis = 20mV, switching
disabled below this level3.453.90V
GATE DRIVERSDH Gate-Driver On-Resistance
(Note 3)RON ( D H ) VBST - VLX forced to 5V4.5Ω
High state (pullup)4.5DL Gate-Driver On-Resistance
(Note 3)RON(DL)Low state (pulldown)2.0Ω
LOGICHigh3.0TRIG Logic LevelsVTRIG350mV hysteresisLow1.2V
Logic high (VCC; 200kHz operation)VCC - 0.4
Open (300kHz operation)1.63.1TON Logic LevelsVTON
Logic low (GND; 550kHz operation)0.5
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.
