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MAX1887EEEMAXINN/a160avai4.0-28 V, quick-PWM slave controller for multiphase, step-down supplie
MAX1897EGPMAXIMN/a600avai4.0-28 V, quick-PWM slave controller for multiphase, step-down supplie
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MAX1897ETPMAXIMN/a198avai4.0-28 V, quick-PWM slave controller for multiphase, step-down supplie


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MAX1897ETP ,4.0-28 V, quick-PWM slave controller for multiphase, step-down suppliefeatures.200kHz/300kHz/550kHz (MAX1897) SwitchingSynchronized to the master’s low-side gate driver, ..
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MAX1887EEE-MAX1897EGP-MAX1897ETP
4.0-28 V, quick-PWM slave controller for multiphase, step-down supplie
General Description
The MAX1887/MAX1897 step-down slave controllers are
intended for low-voltage, high-current, multiphase DC-to-
DC applications. The MAX1887/MAX1897 slave con-
trollers can be combined with any of Maxim’s
Quick-PWM™ step-down controllers to form a multiphase
DC-to-DC converter. Existing Quick-PWM controllers,
such as the MAX1718, function as the master controller,
providing accurate output voltage regulation, fast tran-
sient response, and fault protection features.
Synchronized to the master’s low-side gate driver, the
MAX1887/MAX1897 include the Quick-PWM constant on-
time controller, gate drivers for a synchronous rectifier,
active current balancing, and precision current-limit cir-
cuitry.
The MAX1887/MAX1897 provide the same high effi-
ciency, ultra-low duty factor capability, and excellent
transient response as other Quick-PWM controllers. The
MAX1887/MAX1897 differentially sense the inductor
currents of both the master and the slave across cur-
rent-sense resistors. These differential inputs and the
adjustable current-limit threshold derived from an exter-
nal reference allow the slave controller to accurately
balance the inductor currents and provide precise cur-
rent-limit protection. The MAX1887/MAX1897’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 MAX1887 triggers on the rising edge of the mas-
ter’s low-side gate driver, which staggers the on-times
of both master and slave, providing out-of-phase oper-
ation that can reduce the input ripple current and con-
sequently the number of input capacitors. The
MAX1897 features a selectable trigger polarity, allowing
out-of-phase or simultaneous in-phase operation.
Applications

Notebook Computers
CPU Core Supply
Single-Stage (BATT to VCORE) Converters
Two-Stage (5V to VCORE) Converters
Servers/Desktop Computers
Telecom
Features
Quick-PWM Slave ControllerPrecise, Active Current Balance (±1.25mV )Accurate, Adjustable Current-Limit ThresholdOptimized for Low-Output Voltages (≤2V)4V to 28V Battery Input RangeFixed 300kHz (MAX1887) or Selectable
200kHz/300kHz/550kHz (MAX1897) Switching
Frequency
Drive Large Synchronous-Rectifier MOSFETs525µA (typ) ICCSupply Current20µA Standby Supply Current<1µA Shutdown (MAX1897) Supply CurrentSmall 16-Pin QSOP (MAX1887), Compact
20-Pin 5mm x 5mm QFN (MAX1897), or
20-Pin 5mm x 5mm Thin QFN (MAX1897)
MAX1887/MAX1897
Quick-PWM Slave Controllers for
Multiphase, Step-Down Supplies
Pin Configuration

19-2188; Rev 1; 9/02
Ordering Information
Typical Operating Circuit appears at end of data sheet.

Quick-PWM is a registered trademark of Maxim Integrated
Products, Inc.
*Contact factory for availability.
MAX1887/MAX1897
Quick-PWM Slave Controllers for
Multiphase, Step-Down Supplies
ABSOLUTE MAXIMUM RATINGS

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.
V+ to GND..............................................................-0.3V to +30V
VCC, VDDto GND (Note 3).......................................-0.3V to +6V
PGND to GND.....................................................................±0.3V
TRIG, LIMIT to GND.................................................-0.3V to +6VSHDNto GND (MAX1897)........................................-0.3V to +6V
ILIM, CM+, CM-, CS+, CS-, COMP
to GND....................................................-0.3V to (VCC+ 0.3V)
TON, POL to GND (MAX1897)...................-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)
16-Pin QSOP (derate 8.3mW/°C above +70°C)...........667mW
20-Pin 5mm x 5mm QFN (derate 20.0mW/°C
above +70°C)..............................................................1.60W
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
ELECTRICAL CHARACTERISTICS

(Circuit of Figure 1, V+ = 15V, VCC= VDD= 5V, VOUT= VCOMP= 1.2V, VCM+= VCM-= VCS+= VCS-= 1.2V, SHDN= VCC
(MAX1897), TA= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
MAX1887/MAX1897
Quick-PWM Slave Controllers for
Multiphase, Step-Down Supplies
ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1, V+ = 15V, VCC= VDD= 5V, VOUT= VCOMP= 1.2V, VCM+= VCM-= VCS+= VCS-= 1.2V, SHDN= VCC
MAX1887/MAX1897
Quick-PWM Slave Controllers for
Multiphase, Step-Down Supplies
ELECTRICAL CHARACTERISTICS

(Circuit of Figure 1, V+ = 15V, VCC= VDD= 5V, VOUT= VCOMP= 1.2V, VCM+= VCM-= VCS+= VCS-= 1.2V, SHDN= VCC
ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1, V+ = 15V, VCC= VDD= 5V, VOUT= VCOMP= 1.2V, VCM+= VCM-= VCS+= VCS-= 1.2V, SHDN= VCC
MAX1887/MAX1897
Quick-PWM Slave Controllers for
Multiphase, Step-Down Supplies
ELECTRICAL CHARACTERISTICS (continued)

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 time when the DL pin goes low.
Note 3:
The 20-pin MAX1897 has a separate analog PWM supply voltage input (VCC) and gate-driver supply input (VDD). For the 16-pin
MAX1887 device, the analog PWM supply voltage input and the gate-driver supply voltage input are internally connected and
named VDD.
Note 4:
Production testing limitations due to package handling require relaxed maximum on-resistance specifications for the MAX1897’s
QFN package. The MAX1887 and MAX1897 contain the same die, and the QFN package imposes no additional resistance in-
circuit.
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