MAX8833_09 MAXIM [Maxim Integrated Products], MAX8833_09 Datasheet

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MAX8833_09

Manufacturer Part Number
MAX8833_09
Description
Dual, 3A, 2MHz Step-Down Regulator
Manufacturer
MAXIM [Maxim Integrated Products]
Datasheet
1.MAX8833_09.pdf (20 pages)
The MAX8833 high-efficiency, dual step-down regulator
is capable of delivering up to 3A at each output. The
device operates from a 2.35V to 3.6V supply, and pro-
vides output voltages from 0.6V to 0.9 x V
ideal for on-board point-of-load applications. Total output
error is less than ±1% over load, line, and temperature.
The MAX8833 operates in PWM mode with a switching
frequency ranging from 0.5MHz to 2MHz, set by an
external resistor. It can also be synchronized to an
external clock in the same frequency range. Two inter-
nal switching regulators operate 180° out-of-phase to
reduce the input ripple current, and consequently
reduce the required input capacitance. The high
operating frequency minimizes the size of external
components. High efficiency, internal dual-nMOS
design keeps the board cool under heavy loads. The
voltage-mode control architecture and the high-band-
width (> 15MHz typ) voltage-error amplifier allow a type
III compensation scheme to be utilized to achieve fast
response under both line and load transients, and also
allow for ceramic output capacitors.
Programmable soft-start reduces input inrush current.
Two enable inputs allow the turning on/off of each out-
put individually, resulting in great flexibility for system-
level designs. A reference input is provided to facilitate
output-voltage tracking applications. The MAX8833 is
available in a 32-pin thin QFN (5mm x 5mm) package
with 0.8mm max height.
19-0725; Rev 2; 4/09
Pin Configuration appears at end of data sheet.
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
ASIC/CPU/DSP Power Supplies
DDR Power Supplies
Set-Top Box Power Supplies
Printer Power Supplies
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________________________________________________________________ Maxim Integrated Products
General Description
Dual, 3A, 2MHz Step-Down Regulator
Applications
IN
, making it
o 35mΩ On-Resistance Internal MOSFETs
o Dual, 3A, PWM Step-Down Regulators
o Fully Protected Against Overcurrent,
o ±1% Output Accuracy over Load, Line,
o Operates from 2.35V to 3.6V Supply
o REFIN on One Channel for Tracking or
o Integrated Boost Diodes
o Adjustable Output from 0.6V to 0.9 x V
o Soft-Start Reduces Inrush Supply Current
o 0.5MHz to 2MHz Adjustable Switching,
o All-Ceramic-Capacitor Design
o 180° Out-of-Phase Operation Reduces Input
o Individual Enable Inputs and PWRGD Outputs
o Safe-Start into Prebiased Output
o Available in 5mm x 5mm Thin QFN Package
o Sink/Source Current in DDR Applications
+ Denotes a lead(Pb)-free/RoHS-compliant package.
MAX8833ETJ+
OUTPUT1
Short Circuit, and Overtemperature
and Temperature
External Reference
or FSYNC Input
Ripple Current
1.2V / 3A
PART
OFF
TYPE III
COMPENSATION
ON
2.35V TO 3.6V
INPUT1
Typical Operating Circuit
-40°C to +85°C 32 Thin QFN (5mm x 5mm)
TEMP RANGE
Ordering Information
LX1
PGND1
FB1
PWRGD1 PWRGD2
EN1
BST1
COMP1
MAX8833
IN1 IN2
GND
COMP2
PGND2
BST2
EN2
LX2
FB2
TYPE III
COMPENSATION
INPUT2
2.35V TO 3.6V
PIN-PACKAGE
OFF
Features
ON
IN
OUTPUT2
1.5V / 3A
1

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MAX8833_09 Summary of contents

Page 1

Rev 2; 4/09 Dual, 3A, 2MHz Step-Down Regulator General Description The MAX8833 high-efficiency, dual step-down regulator is capable of delivering each output. The device operates from a 2.35V to 3.6V supply, and pro- vides output ...

Page 2

Dual, 3A, 2MHz Step-Down Regulator ABSOLUTE MAXIMUM RATINGS IN_, LX_ VDL, PWRGD_ to GND..................-0.3V to +4. VDL to IN_.....................................................-0.3V to +4.5V DD EN_, SS_, COMP_, FB_, REFIN, FSYNC to GND ......-0.3V to the lower of ...

Page 3

Dual, 3A, 2MHz Step-Down Regulator ELECTRICAL CHARACTERISTICS (continued 3.3V 0.5V VDD VDL FB 0.022µF, PWRGD not connected -40°C to +85°C, typical values are PARAMETER REFIN, ...

Page 4

Dual, 3A, 2MHz Step-Down Regulator ELECTRICAL CHARACTERISTICS (continued 3.3V 0.5V VDD VDL FB 0.022µF, PWRGD not connected -40°C to +85°C, typical values are PARAMETER FSYNC ...

Page 5

Dual, 3A, 2MHz Step-Down Regulator ( 3.3V. MAX8833, circuit of Figure 6, T IN1 IN2 SWITCHING FREQUENCY vs. TEMPERATURE 1100 1080 1060 1040 1020 1000 980 960 940 920 900 -40 -15 10 AMBIENT TEMPERATURE (°C) SHUTDOWN ...

Page 6

Dual, 3A, 2MHz Step-Down Regulator ( 3.3V. MAX8833, circuit of Figure 6, T IN1 IN2 OUTPUT PEAK CURRENT LIMIT vs. OUTPUT VOLTAGE 0.8 1.1 1.4 1.7 OUTPUT VOLTAGE ...

Page 7

Dual, 3A, 2MHz Step-Down Regulator PIN NAME Power-Good Open-Drain Output for Regulator 1. PWRGD1 is high impedance when V ≥ 0 PWRGD1 V FB1 REFIN thermal shutdown is activated, or when V External Reference Input for Regulator ...

Page 8

Dual, 3A, 2MHz Step-Down Regulator PIN NAME Power-Supply Input for Regulator 1. The voltage range is 2.35V to 3.6V. Connect two 10µF and one 0.1µF 27, 28 IN1 ceramic capacitors from IN1 to PGND1. Enable Input for Regulator 1. Drive ...

Page 9

Dual, 3A, 2MHz Step-Down Regulator V DD SHUTDOWN CONTROL BIAS GENERATOR EN1 EN2 VOLTAGE REFERENCE SS1 SOFT-START 1 SS2 SOFT-START 2 + REFIN - FB1 ERROR AMPLIFIER COMP1 COMP LOW DETECTOR FROM SS2 (0.6V FB2 ERROR AMPLIFIER COMP2 ...

Page 10

Dual, 3A, 2MHz Step-Down Regulator The power-good, open-drain output for regulator 2 (PWRGD2) is high impedance when V ≥ 0 PWRGD2 is low when V FB2 SS2 EN2 is low below V ...

Page 11

Dual, 3A, 2MHz Step-Down Regulator For ratiometric tracking applications, connect REFIN to the center of a voltage-divider from the output of regula- tor 2 to GND (see Figure 3b). In this application, the EN_ inputs are connected to each other ...

Page 12

Dual, 3A, 2MHz Step-Down Regulator Figure 3d. Startup and Sequencing Options—Matching Startup Slopes of Output Voltages with Internal Reference In Figure 3d, EN1 and EN2 are connected together and driven as a single input. Although both outputs begin ramping up ...

Page 13

Dual, 3A, 2MHz Step-Down Regulator In DDR tracking applications such as Figure 7, the FB1 regulation voltage tracks the voltage at REFIN. In Figure 7, the output of regulator 1 tracks V of the output voltages is set as follows: ...

Page 14

Dual, 3A, 2MHz Step-Down Regulator Output-Capacitor Selection The key selection parameters for the output capacitor are capacitance, ESR, ESL, and voltage-rating require- ments. These affect the overall stability, output ripple voltage, and transient response of the DC-DC convert- er. The ...

Page 15

Dual, 3A, 2MHz Step-Down Regulator π × × π × × π × ...

Page 16

Dual, 3A, 2MHz Step-Down Regulator Set the second compensation pole at 1/2 the switching frequency. Calculate C10 as follows π × × The recommended range for R4 is 2kΩ to 10kΩ. Note ...

Page 17

Dual, 3A, 2MHz Step-Down Regulator INPUT 2.35V TO 3. 10µF 0.1µF C4 C18 L1 0.1µF 47µF OUT1 0.56µH 0.1µF 1.2V/ 200Ω C9 10kΩ R7 C11 330pF 10kΩ 1000pF R6 10kΩ C10 OPEN 0.022µF ...

Page 18

Dual, 3A, 2MHz Step-Down Regulator INPUT 2. 10µF 0.1µF C4 C18 L1 0.1µF 47µF OUT1 1µH 0.1µF 0.9V/ 200Ω C9 10kΩ R7 C11 330pF 10kΩ 1000pF OUT2 C10 R1 OPEN 1kΩ R19 ...

Page 19

Dual, 3A, 2MHz Step-Down Regulator Pin Configuration TOP VIEW PGND1 25 PGND1 26 27 IN1 28 IN1 MAX8833 EN1 29 COMP1 30 31 FB1 + 32 SS1 THIN ...

Page 20

Dual, 3A, 2MHz Step-Down Regulator REVISION REVISION NUMBER DATE 0 8/07 Initial release 1 6/08 Revised Features section and corrected Figure 6. Revised Features, Typical Operating Characteristics, and Output-Capacitor 2 4/09 Selection sections. Added the Safe-Starting into a Prebiased Output ...

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