MAX8554EEE+ Maxim Integrated Products, MAX8554EEE+ Datasheet

IC CNTRLR BUCK PWM 16-QSOP

MAX8554EEE+

Manufacturer Part Number
MAX8554EEE+
Description
IC CNTRLR BUCK PWM 16-QSOP
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX8554EEE+

Pwm Type
Controller
Number Of Outputs
1
Frequency - Max
550kHz
Duty Cycle
95%
Voltage - Supply
4.5 V ~ 28 V
Buck
Yes
Boost
No
Flyback
No
Inverting
No
Doubler
No
Divider
Yes
Cuk
No
Isolated
No
Operating Temperature
-40°C ~ 85°C
Package / Case
16-QSOP
Frequency-max
550kHz
Output Voltage
0.6 V to 3.5 V
Output Current
25000 mA
Mounting Style
SMD/SMT
Switching Frequency
550 KHz
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Synchronous Pin
No
Topology
Buck
Dc
0649
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX8553 is a 4.5V to 28V input-voltage, synchro-
nous step-down controller that provides a complete
power-management solution for DDR memory. The
MAX8553 generates 1/2 V
VTTR. The VTT and VTTR tracking voltages are main-
tained within 1% of 1/2 V
28V input voltage, nontracking step-down controller with
a low 0.6V feedback threshold voltage. The MAX8553/
MAX8554 use Maxim’s proprietary Quick-PWM™ archi-
tecture for fast transient response and operate with
selectable pseudo-fixed frequencies. Both controllers
can operate without an external bias supply.
The controllers operate in synchronous-rectification mode
to ensure balanced current sourcing and sinking capabili-
ty of up to 25A. The MAX8553/MAX8554 also provide up
to 95% efficiency, making them ideal for server and point-
of-load applications. Additionally, a low 5µA shutdown
current allows for longer battery life in notebook applica-
tions. Lossless current monitoring is achieved by monitor-
ing the low-side MOSFET’s drain-to-source voltage. The
MAX8553/MAX8554 have an adjustable foldback current
limit to withstand a continuous output overload and short
circuit. Digital soft-start provides control of inrush current
during power-up. Overvoltage protection shuts the con-
verter down and discharges the output capacitor. The
MAX8553/MAX8554 come in space-saving 16-pin QSOP
packages.
19-3017; Rev 1; 5/05
Quick-PWM is a trademark of Maxim Integrated Products, Inc.
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.
4.5V to 28V Input, Synchronous PWM Buck Controllers
MAX8553EEE
MAX8554EEE
Wide-Input Power Supplies
Servers and Storage Applications
ASIC and CPU Core Voltages
Notebook and LCD-PC Power Supplies
DDR I and DDR II Memory Power Supplies
AGTL Bus Termination Supplies
PART
for DDR Termination and Point-of-Load Applications
________________________________________________________________ Maxim Integrated Products
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
Ordering Information
General Description
REFIN
REFIN
. The MAX8554 is a 4.5V to
voltage for VTT and
Applications
PIN-PACKAGE
16 QSOP
16 QSOP
♦ Up to 25A Output-Current Capability
♦ Quick-PWM Control for Fast Loop Response
♦ Up to 95% Efficiency
♦ 4.5V to 28V Input Voltage Range
♦ No External Bias Supply Required
♦ 0 to 3.6V Input REFIN Range (MAX8553)
♦ Automatically Sets VTT and VTTR to within ±1%
♦ Low 0.6V Feedback Threshold (MAX8554)
♦ 200kHz/300kHz/400kHz/550kHz Selectable
♦ Adjustable Foldback Current Limit
♦ Overvoltage Protection
♦ Digital Soft-Start
Pin Configurations appear at end of data sheet.
POK
REFIN
of 1/2 V
Switching Frequencies
VIN
V+
+5V
REFIN
EN/HSD
POK
REFIN
V+
ILIM
FSEL
REF
GND
Typical Operating Circuit
- (MAX8553)
MAX8553
PGND
VTTR
BST
VTT
DH
DL
VL
LX
Features
VOUT
VTTR
1

Related parts for MAX8554EEE+

MAX8554EEE+ Summary of contents

Page 1

... TEMP RANGE MAX8553EEE -40°C to +85°C -40°C to +85°C MAX8554EEE Quick-PWM is a trademark of Maxim Integrated Products, Inc. ________________________________________________________________ Maxim Integrated Products 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. ♦ 25A Output-Current Capability ♦ ...

Page 2

Input, Synchronous PWM Buck Controllers for DDR Termination and Point-of-Load Applications ABSOLUTE MAXIMUM RATINGS V+, EN/HSD, EN, HSD to GND...............................-0.3V to +30V PGND to GND .......................................................-0.3V to +0.3V VTT, REFIN, POK, OUT, FB GND...................-0.3V to ...

Page 3

Input, Synchronous PWM Buck Controllers for DDR Termination and Point-of-Load Applications ELECTRICAL CHARACTERISTICS (continued +12V HSD EN/HSD REFIN PGND = LX = GND, BST = VL 0°C ...

Page 4

Input, Synchronous PWM Buck Controllers for DDR Termination and Point-of-Load Applications ELECTRICAL CHARACTERISTICS (continued +12V HSD EN/HSD REFIN PGND = LX = GND, BST = VL 0°C ...

Page 5

Input, Synchronous PWM Buck Controllers for DDR Termination and Point-of-Load Applications ELECTRICAL CHARACTERISTICS (continued +12V HSD EN/HSD REFIN PGND = LX = GND, BST = VL 0°C ...

Page 6

Input, Synchronous PWM Buck Controllers for DDR Termination and Point-of-Load Applications ELECTRICAL CHARACTERISTICS (continued +12V HSD EN/HSD REFIN = LX = POK = GND, BST = VL ...

Page 7

Input, Synchronous PWM Buck Controllers for DDR Termination and Point-of-Load Applications ELECTRICAL CHARACTERISTICS (continued +12V HSD EN/HSD REFIN = LX = POK = GND, BST = VL ...

Page 8

Input, Synchronous PWM Buck Controllers for DDR Termination and Point-of-Load Applications (V = 12V 1.8V, circuit of Figure OUT EFFICIENCY vs. LOAD CURRENT (CIRCUIT OF FIGURE 2) 100 ...

Page 9

Input, Synchronous PWM Buck Controllers for DDR Termination and Point-of-Load Applications (V = 12V 1.8V, circuit of Figure OUT LOAD TRANSIENT 0A TO 20A TO 0A (CIRCUIT OF FIGURE 1) I OUT ...

Page 10

Input, Synchronous PWM Buck Controllers for DDR Termination and Point-of-Load Applications (V = 12V 1.8V, circuit of Figure V+ OUT POWER-UP WAVEFORMS WITH 20A LOAD (CIRCUIT OF FIGURE OUT V POK ...

Page 11

Input, Synchronous PWM Buck Controllers for DDR Termination and Point-of-Load Applications PIN MAX8553 MAX8554 Enable/High-Side Drain. Connect to the high-side N-channel MOSFET drain through a 5.1kΩ EN/HSD — resistor for normal operation. Connect to GND for low-power ...

Page 12

Input, Synchronous PWM Buck Controllers for DDR Termination and Point-of-Load Applications FSEL ON-TIME COMPUTE TON TRIG Q ONE-SHOT POK VTTR VTT POK REFIN EN/HSD 60% 56% 50% 44% MAX8553 12 ______________________________________________________________________________________ VTT Q TRIG ONE-SHOT S Q ...

Page 13

Input, Synchronous PWM Buck Controllers for DDR Termination and Point-of-Load Applications FSEL ON-TIME COMPUTE TON TRIG Q ONE-SHOT HSD POK FB POK EN MAX8554 ______________________________________________________________________________________ Functional Diagrams (continued) OUT Q TRIG ONE-SHOT LATCH Q ...

Page 14

Input, Synchronous PWM Buck Controllers for DDR Termination and Point-of-Load Applications R1 20kΩ POK POK FSEL OFF HSD C7 0.22µF 10V MAX8554 REF R4 25.5kΩ ILIM PGND R5 110kΩ GND Figure 1. Typical Application ...

Page 15

Input, Synchronous PWM Buck Controllers for DDR Termination and Point-of-Load Applications R1 20kΩ POK POK FSEL OFF HSD C7 0.22µF 10V MAX8554 REF R4 61.9kΩ ILIM R5 80.6kΩ GND Figure 3. Typical Application Circuit ...

Page 16

Input, Synchronous PWM Buck Controllers for DDR Termination and Point-of-Load Applications Table 1. Configuration of FSEL (MAX8553) FSEL CONNECTED TO N Ground 1.07 REF 1.33 Floating 2.00 VL 3.00 Table 2. Configuration of FSEL (MAX8554) FSEL CONNECTED ...

Page 17

Input, Synchronous PWM Buck Controllers for DDR Termination and Point-of-Load Applications Predischarge Mode The MAX8553/MAX8554 discharge the output to GND before the digital soft-start begins. When EN/HSD (EN) is pulled high, the MAX8553 (MAX8554) starts an inter- ...

Page 18

Input, Synchronous PWM Buck Controllers for DDR Termination and Point-of-Load Applications TIME Figure 4. Inductor-Current Waveform Carefully observe the PC board layout guidelines to ensure that noise and DC errors do not corrupt the cur- rent-sense signals ...

Page 19

Input, Synchronous PWM Buck Controllers for DDR Termination and Point-of-Load Applications peak inductor current at the maximum-defined load current (I ): LOAD(MAX)  LIR = +  PEAK LOAD MAX ( )  2 Output-Capacitor ...

Page 20

Input, Synchronous PWM Buck Controllers for DDR Termination and Point-of-Load Applications Setting the Current Limit Constant Current Limit The adjustable current limit accommodates MOSFETs with a wide range of on-resistance values. The current- limit threshold is adjusted ...

Page 21

Input, Synchronous PWM Buck Controllers for DDR Termination and Point-of-Load Applications Setting Voltage Positioning The droop resistor, R (R4) in Figure DRP the output inductor before the output capacitor, sets the droop voltage Choose R ...

Page 22

Input, Synchronous PWM Buck Controllers for DDR Termination and Point-of-Load Applications OUT = × HSCC LOAD V IN Use DS(ON) J(MAX × × × P ...

Page 23

Input, Synchronous PWM Buck Controllers for DDR Termination and Point-of-Load Applications outside using the top copper layer, while tying in PGND and LX inside (underneath) the 8-pin SO package. 5) When trade-offs in trace lengths must be ...

Page 24

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 24 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc ...

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