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Description
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The MAX1887/MAX1897 step-down slave controllers are intended for low-voltage, high-current, multiphase DC-to-DC applications. The MAX1887/MAX1897 slave controllers 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 transient 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 circuitry.
The MAX1887/MAX1897 provide the same high efficiency, 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 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 currents and provide precise current-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 master's low-side gate driver, which staggers the on-times of both master and slave, providing out-of-phase operation that can reduce the input ripple current and consequently the number of input capacitors. The MAX1897 features a selectable trigger polarity, allowing out-of-phase or simultaneous in-phase operation.
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| Ordering Information |
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Notes:
- Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
- Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
- Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
- * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
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Devices:
1-8
of
8
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| MAX1887 |
Free
Sample |
Buy |
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Package:
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TYPE PINS FOOTPRINT
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DRAWING CODE/VAR *
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Temp |
RoHS/Lead-Free?
Materials Analysis |
MAX1887EEE
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QSOP;16 pin;31 mm²
Outline Drawing: 21-0055 (PDF)
Land Pattern: 90-0167 (PDF)
Use pkgcode/variation: E16-1*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis
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MAX1887EEE-T
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QSOP;16 pin;31 mm²
Outline Drawing: 21-0055 (PDF)
Land Pattern: 90-0167 (PDF)
Use pkgcode/variation: E16-1*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis
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| MAX1897 |
Free
Sample |
Buy |
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Package:
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TYPE PINS FOOTPRINT
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DRAWING CODE/VAR *
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Temp |
RoHS/Lead-Free?
Materials Analysis |
MAX1897EGP
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QFN;20 pin;26 mm²
Outline Drawing: 21-0091 (PDF)
Land Pattern: Not Available
Use pkgcode/variation: G2055-2*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis
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MAX1897EGP-T
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QFN;20 pin;26 mm²
Outline Drawing: 21-0091 (PDF)
Land Pattern: Not Available
Use pkgcode/variation: G2055-2*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis
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MAX1897ETP
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TQFN;20 pin;26 mm²
Outline Drawing: 21-0140 (PDF)
Land Pattern: 90-0009 (PDF)
Use pkgcode/variation: T2055-4*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis
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MAX1897ETP-T
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TQFN;20 pin;26 mm²
Outline Drawing: 21-0140 (PDF)
Land Pattern: 90-0009 (PDF)
Use pkgcode/variation: T2055-4*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis
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MAX1897ETP+
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TQFN;20 pin;26 mm²
Outline Drawing: 21-0140 (PDF)
Land Pattern: 90-0009 (PDF)
Use pkgcode/variation: T2055+4*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis
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MAX1897ETP+T
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TQFN;20 pin;26 mm²
Outline Drawing: 21-0140 (PDF)
Land Pattern: 90-0009 (PDF)
Use pkgcode/variation: T2055+4*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis
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