MAX1887 Maxim Integrated Products, MAX1887 Datasheet
MAX1887
Manufacturer Part Number
MAX1887
Description
(MAX1887 / MAX1897) Quick-PWM Slave Controllers
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX1887.pdf
(33 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MAX1887EEE
Manufacturer:
MAXIM
Quantity:
6 237
Part Number:
MAX1887EEE
Manufacturer:
MAXIM/美信
Quantity:
20 000
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.
19-2188; Rev 1; 9/02
Typical Operating Circuit appears at end of data sheet.
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.
Quick-PWM is a registered trademark of Maxim Integrated
Products, Inc.
Notebook Computers
CPU Core Supply
Single-Stage (BATT to V
Two-Stage (5V to V
Servers/Desktop Computers
Telecom
________________________________________________________________ Maxim Integrated Products
General Description
CORE
CORE
) Converters
Applications
) Converters
Quick-PWM Slave Controllers for
Multiphase, Step-Down Supplies
o Quick-PWM Slave Controller
o Precise, Active Current Balance (±1.25mV )
o Accurate, Adjustable Current-Limit Threshold
o Optimized for Low-Output Voltages (≤2V)
o 4V to 28V Battery Input Range
o Fixed 300kHz (MAX1887) or Selectable
o Drive Large Synchronous-Rectifier MOSFETs
o 525µA (typ) I
o 20µA Standby Supply Current
o <1µA Shutdown (MAX1897) Supply Current
o Small 16-Pin QSOP (MAX1887), Compact
*Contact factory for availability.
MAX1887EEE
M A X1 8 9 7E GP*
MAX1897ETP
Pin Configurations continued at end of data sheet.
200kHz/300kHz/550kHz (MAX1897) Switching
Frequency
20-Pin 5mm x 5mm QFN (MAX1897), or
20-Pin 5mm x 5mm Thin QFN (MAX1897)
PART
TOP VIEW
CM+
CM-
TON
CS+
CS-
CC
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
1
2
3
4
5
TEMP RANGE
THIN QFN 5mm x 5mm
Supply Current
20
6
Ordering Information
19
7
MAX1897
Pin Configuration
18
8
16 QSOP
20 QFN 5mm
20 Thin QFN 5mm
PIN-PACKAGE
17
9
16
10
Features
15
14
13
12
11
✕
LX
DH
SHDN
V
V
5mm
CC
DD
✕
5mm
1
Related parts for MAX1887
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
MAX7528KCWPMaxim Integrated Products [CMOS Dual 8-Bit Buffered Multiplying DACs]
Manufacturer:
Maxim Integrated Products
Datasheet:
Part Number:
Description:
Single +5V, fully integrated, 1.25Gbps laser diode driver.
Manufacturer:
Maxim Integrated Products
Datasheet:
Part Number:
Description:
Single +5V, fully integrated, 155Mbps laser diode driver.
Manufacturer:
Maxim Integrated Products
Datasheet:
Part Number:
Description:
VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers
Manufacturer:
Maxim Integrated Products
Datasheet:
Part Number:
Description:
Highly Integrated Level 2 SMBus Battery Chargers
Manufacturer:
Maxim Integrated Products
Datasheet:
Part Number:
Description:
Current Monitor and Accumulator with Integrated Sense Resistor; ; Temperature Range: -40°C to +85°C
Manufacturer:
Maxim Integrated Products
Part Number:
Description:
TSSOP 14/A°/RS-485 Transceivers with Integrated 100O/120O Termination Resis
Manufacturer:
Maxim Integrated Products
Part Number:
Description:
TSSOP 14/A°/RS-485 Transceivers with Integrated 100O/120O Termination Resis
Manufacturer:
Maxim Integrated Products
Part Number:
Description:
QFN 16/A°/AC-DC and DC-DC Peak-Current-Mode Converters with Integrated Step
Manufacturer:
Maxim Integrated Products
Part Number:
Description:
TDFN/A/65V, 1A, 600KHZ, SYNCHRONOUS STEP-DOWN REGULATOR WITH INTEGRATED SWI
Manufacturer:
Maxim Integrated Products
Part Number:
Description:
Integrated Temperature Controller f
Manufacturer:
Maxim Integrated Products
Part Number:
Description:
SOT23-6/I°/45MHz to 650MHz, Integrated IF VCOs with Differential Output
Manufacturer:
Maxim Integrated Products
Part Number:
Description:
SOT23-6/I°/45MHz to 650MHz, Integrated IF VCOs with Differential Output
Manufacturer:
Maxim Integrated Products
Part Number:
Description:
EVALUATION KIT/2.4GHZ TO 2.5GHZ 802.11G/B RF TRANSCEIVER WITH INTEGRATED PA
Manufacturer:
Maxim Integrated Products
Part Number:
Description:
QFN/E/DUAL PCIE/SATA HIGH SPEED SWITCH WITH INTEGRATED BIAS RESISTOR
Manufacturer:
Maxim Integrated Products
Datasheet: