Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - gate drivers PWM High side, Low side, Sychronous uMAX 10

General Description

The MAX8552 highly integrated monolithic MOSFET dri-

ver is capable of driving a pair of power MOSFETs in

single or multiphase synchronous buck-converter appli-

cations that provide up to 30A output current per

phase. The MAX8552 simplifies PC board layout in mul-

tiphase systems, particularly three phases and higher.

High input voltages up to 24V allow the MAX8552 to be

used in desktop, notebook, and server applications.

Each MOSFET driver is capable of driving 3000pF

capacitive loads with only 12ns propagation delay and

11ns (typ) rise and fall times, making the MAX8552

ideal for high-frequency applications.

User-programmable break-before-make circuitry pre-

vents shoot-through currents, maximizing converter effi-

ciency. An enable input allows total driver shutdown

(<1µA typ) for power-sensitive portable applications.

The PWM control input is compatible with TTL and

CMOS logic levels. The MAX8552, along with the

MAX8524 or the MAX8525 multiphase controllers, pro-

vides flexible 2-, 3-, 4-, 6-, or 8-phase CPU core-voltage

supplies.

The MAX8552 is available in space-saving 10-pin TDFN

and µMAX packages and is specified for -40°C to

+85°C operation.

Applications

Multiphase Buck Converters

Voltage Regulator Modules (VRMs)

Processor-Core Voltage Regulators

Desktops, Notebooks, and Servers

Switching Power Supplies

Features

♦ Single-Phase Synchronous Drivers

♦ Up to 24V (max) Input Voltage

♦ 0.1µA (typ) Quiescent Current in Shutdown Over

Temperature

♦ 0.5Ω/1.0Ω/0.7Ω/1.3Ω R

OUT

Drivers

♦ 12ns (typ) Propagation Delay

♦ 11ns (typ) Rise/Fall Times with 3000pF Load

♦ Adaptive Dead Time and User-Programmable

Delay Mode

♦ Up to 2MHz Operation with TDFN Package

♦ Up to 1.2MHz Operation with µMAX Package

♦ Enable Function

♦ TTL- and CMOS-Compatible Logic Inputs

♦ Available in a Space-Saving Thin DFN Package

MAX8552

High-Speed, Wide-Input,

Single-Phase MOSFET Driver

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

GND

OFF

DLY

PWM

BST

PGND

MAX8552

6V TO 24V

OUT

1.45V AT 20A

4.5V TO 6.5V

PWM CONTROL

SIGNAL

Typical Operating Circuit

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.

19-2997; Rev 0; 10/03

PART TEMP RANGE PIN-PACKAGE

MAX8552EUB -40°C to +85°C 10 µMAX

MAX8552ETB -40°C to +85°C

10 TDFN

3mm x 3mm

Pin Configurations appear at end of data sheet.

Summary of content (11 pages)

PAGE 1
N TDF -PI m m 3.0 m N 8 19-2997; Rev 0; 10/03 m x 3.0 High-Speed, Wide-Input, Single-Phase MOSFET Driver Features The MAX8552 highly integrated monolithic MOSFET driver is capable of driving a pair of power MOSFETs in single or multiphase synchronous buck-converter applications that provide up to 30A output current per phase. The MAX8552 simplifies PC board layout in multiphase systems, particularly three phases and higher.
PAGE 2
MAX8552 High-Speed, Wide-Input, Single-Phase MOSFET Driver ABSOLUTE MAXIMUM RATINGS VCC to GND ..............................................................-0.3V to +7V PWM, EN, DL, DLY to GND ........................-0.3V to (VCC + 0.3V) BST to PGND..........................................................-0.3V to +35V LX to PGND ...............................................................-1V to +28V DH to PGND ..............................................-0.3V to (VBST + 0.3V) DH, BST to LX.........
PAGE 3
High-Speed, Wide-Input, Single-Phase MOSFET Driver (VCC = VBST = VDLY = VEN = 5V, VGND = VPGND = VLX = 0V; TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER CONDITIONS PWM = GND, sourcing current DL Driver Resistance TYP MAX VCC = 4.5V MIN 1.0 1.6 VCC = 5V 0.9 PWM = VCC, sinking current VCC = 4.5V 0.5 VCC = 5V 0.
PAGE 4
Typical Operating Characteristics (VCC = VDLY = 5V, CHS_LOAD = CLS_LOAD = 3000pF, 50% duty ratio.) PACKAGE-POWER DISSIPATION vs. CAPACITIVE LOAD ON DH AND DL A 300 C 250 B 250 200 150 150 100 100 50 50 A 200 400 600 800 1000 RISE TIME 16 14 12 10 8 FALL TIME 6 4 2 VCC = 6.5V 0 1000 1000 1500 2000 2500 3000 3500 4000 4500 5000 1200 2000 3000 4000 PWM FREQUENCY (kHz) CAPACITANCE (pF) CAPACITANCE (pF) DH RISE AND FALL TIMES vs. CAPACITIVE LOAD DH AND DL RISE AND FALL TIMES vs.
PAGE 5
High-Speed, Wide-Input, Single-Phase MOSFET Driver PIN NAME FUNCTION 1 VCC Input Supply Voltage. Connect to a supply voltage in the 4.5V to 6.5V range. Bypass to PGND with a 2.2µF or larger capacitor, and bypass to GND with a 0.47µF or larger capacitor. 2 DL External Synchronous-Rectifier N-MOSFET Gate-Driver Output. Swings between VCC and PGND. Anticrowbar feature prevents DL from turning on until DH is off and (LX - PGND) < 2V. DL is pulled to GND in shutdown.
PAGE 6
High-Speed, Wide-Input, Single-Phase MOSFET Driver MAX8552 Timing Diagram tpDHf tpDLf PWM tfDL DL tpDHr tpDLr trDL (tDLY)* LX trDH tfDH DH *WHEN RDLY IS USED, tpDHr BECOMES THE LONGER OF THE USER-PROGRAMMABLE TIME DELAY, tDLY, OR THE ADAPTIVE DEAD TIME, tpDHr. DRAWING IS NOT TO SCALE.
PAGE 7
High-Speed, Wide-Input, Single-Phase MOSFET Driver The MAX8552 single-phase gate driver, along with the MAX8524/MAX8525 multiphase controllers, provide flexible one- to eight-phase CPU core-voltage supplies. The 1.0Ω/1.3Ω driver resistance allows up to 30A output current per phase. Each MOSFET driver in the MAX8552 is capable of driving 3000pF capacitive loads with only 12ns propagation delay and 11ns (typ) rise and fall times, allowing operation up to 1.2MHz per phase.
PAGE 8
MAX8552 High-Speed, Wide-Input, Single-Phase MOSFET Driver VCC 4.5V TO 6.5V D1 1 C5 4.7µF C4 0.47µF 4 7 ON 5 OFF VCC BST GND DH EN MAX8552 LX C1 10µF 10 9 8 N1 C2 10µF C3 10µF VIN 6V TO 24V N2 C6 0.47µF VOUT 1.45V AT 25A L1 DLY DL 2 N3 N4 R1 C7–C10 390µF 6 PWM CONTROL SIGNAL PWM PGND 3 Figure 1. Typical Application Circuit Table 1.
PAGE 9
High-Speed, Wide-Input, Single-Phase MOSFET Driver 4) Connect PGND of the MAX8552 as close as possible to the source of the low-side MOSFETs. 5) Keep LX away from sensitive analog components and nodes. Place the IC and the analog components on the opposite side of the board from the power-switching node if possible. A sample layout is available in the MAX8552 evaluation kit.
PAGE 10
Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) e 10LUMAX.EPS MAX8552 High-Speed, Wide-Input, Single-Phase MOSFET Driver 4X S 10 10 INCHES H Ø0.50±0.1 0.6±0.1 1 1 0.6±0.1 BOTTOM VIEW TOP VIEW D2 MILLIMETERS MAX DIM MIN 0.043 A 0.006 A1 0.002 A2 0.030 0.037 0.120 D1 0.116 0.118 D2 0.114 0.120 E1 0.116 0.118 E2 0.114 0.199 H 0.187 L 0.0157 0.0275 L1 0.
PAGE 11
High-Speed, Wide-Input, Single-Phase MOSFET Driver 6, 8, &10L, DFN THIN.EPS PACKAGE OUTLINE, 6,8,10 & 14L, TDFN, EXPOSED PAD, 3x3x0.80 mm 21-0137 COMMON DIMENSIONS MIN. MAX. PKG. CODE N D2 E2 e JEDEC SPEC b A 0.70 0.80 T633-1 6 1.50±0.10 2.30±0.10 0.95 BSC MO229 / WEEA 0.40±0.05 1.90 REF D 2.90 3.10 T633-2 6 1.50±0.10 2.30±0.10 0.95 BSC MO229 / WEEA 0.40±0.05 1.90 REF 2 [(N/2)-1] x e E 2.90 3.10 T833-1 8 1.50±0.10 2.30±0.10 0.65 BSC MO229 / WEEC 0.30±0.05 1.