Microsemi Corporation LX1663ACN, LX1663ACD, LX1662CN, LX1662CD, LX1662ACN Datasheet

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LIN DOC #: 1662

TDRV

INV V

CC_CORE

VID0 VID1 VID2 VID3

VID4

BDRV

GND

LX1662

VID3

1µF

12V

OUT

14-pin, Narrow Body SOIC

IRL3102

, 2.5µH

6.3V, 1500µF x 3**

680pF

VID2

VID1

VID0

VID4

0.1µF

2.5m9

Supply Voltage for CPU Core

6.3V 1500µF x3

** Three capacitors for Pentium

Four capacitors for Pentium II

IRL3303

1µH

LX1662/62A, LX1663/63A

INGLE-CHIP PROGRAMMABLE

PWM C

ONTROLLERS WITH

5-BIT DAC

T HE I NFINITE P OWER OF I NNOVATION

DESCRIPTION KEY FEATURES

The LX1662/62A and LX1663/63A are Monolithic Switching Regulator Controller IC’s designed to provide a low cost,

high performance adjustable power supply for advanced microprocessors and other applications requiring a very fast transient response and a high degree of accuracy.

Short-Circuit Current Limiting with-

out Expensive Current Sense Resistors.

Current-sensing mechanism can use PCB trace resistance or the parasitic resistance of the main inductor. The LX1662A and LX1663A have reduced current sense comparator threshold for optimum performance using a PCB trace. For applications requiring a high degree of accuracy, a conventional sense resistor can be used to sense current.

Programmable Synchronous Recti-

fier Driver for CPU Core. The main

output is adjustable from 1.3V to 3.5V using a 5-bit code. The IC can read a VID signal set by a DIP switch on the motherboard, or hardwired into the processor’s package (as in the case of Pentium

Pro and Pentium II processors). The 5-bit code adjusts the output voltage between 1.30 and 2.05V in 50mV increments and between 2.0 and 3.5V in 100mV increments, conforming to the

IMPORTANT: For the most current data, consult LinFinity's web site: http://www.linfinity.com.

Intel Corporation specification. The device can drive dual MOSFET’s resulting in typical efficiencies of 85 - 90% even with loads in excess of 10 amperes. For cost sensitive applications, the bottom MOSFET can be replaced with a Schottky diode (non-synchronous operation).

Smallest Package Size. The LX1662 is

available in a narrow body 14-pin surface mount IC package for space sensitive applications. The LX1663 provides the additional functions of Over Voltage Protection (OVP) and Power Good (PWRGD) output drives for applications requiring output voltage monitoring and protection functions.

Ultra-Fast Transient Response Re-

duces System Cost. The modulated off-

time architecture results in the fastest transient response for a given inductor, reducing output capacitor requirements, and reducing the total regulator system cost.

Over-Voltage Protection and Power

Good Flag. The OVP output in the LX1663

& LX1663A can be used to drive an SCR crowbar circuit to protect the load in the event of a short-circuit of the main MOSFET. The LX1663 & LX1663A also have a logiclevel Power Good Flag to signal when the output voltage is out of specified limits.

P RODUCTION DATA SHEET

■ 5-bit Programmable Output For CPU Core Supply

■ No Sense Resistor Required For ShortCircuit Current Limiting

■ Designed To Drive Either Synchronous Or Non-Synchronous Output Stages

■ Lowest System Cost Possible For PriceSensitive Pentium And Pentium II Class Applications

■ Soft-Start Capability

■ Modulated, Constant Off-Time Architecture

For Fast Transient Response And Simple System Design

■ Available Over-Voltage Protection (OVP) Crowbar Driver And Power Good Flag (LX1663 only)

■ Small, Surface-Mount Packages

APPLICATIONS

■ Socket 7 Microprocessor Supplies (including Intel Pentium Processor, AMD-

And Cyrix® 6x86TM, Gx86TM and M2

Processors)

■ Pentium II and Deschutes Processor & L2Cache Supplies

■ Voltage Regulator Modules

■ General Purpose DC:DC Converter

Applications

LX1662

IN A PENTIUM/PENTIUM II

SINGLE-CHIP POWER

SUPPLY SOLUTION

(°C)

0 to 70

Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. LX1662CDT)

PRODUCT HIGHLIGHT

PACKAGE ORDER INFORMATION

11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570

Plastic DIP 14-pin

LX1662CN LX1663CN LX1662CD LX1663CD

LX1662ACN LX1663ACN LX1662ACD LX1663ACD

L INF INITY MICROELECTRONICS INC.

Plastic DIP

16-pin

Plastic SOIC

14-pin

Plastic SOIC

16-pin

for

See next page

Selection Guide

PRODUCT DATABOOK 1996/1997

LX1662/62A, LX1663/63A

INGLE-CHIP PROGRAMMABLE

P RODUCTION DATA SHEET

PWM C

ONTROLLERS WITH

5-BIT DAC

DEVICE SELECTION GUIDE

OVP and Current-Sense

DEVICE Packages Power Good Comp. Thresh. (mV) Optimal Load

LX1662 14-pin SOIC LX1662A & DIP 60 Pentium II (> 10A) LX1663 16-pin SOIC LX1663A & DIP 60 Pentium II (> 10A)

Yes

100 Pentium-class (<10A)

ABSOLUTE MAXIMUM RATINGS (Note 1)

Supply Voltage (VC1) .................................................................................................... 25V

Supply Voltage (VCC) .................................................................................................... 15V

Output Drive Peak Current Source (500ns)............................................................... 1.5A

Output Drive Peak Current Sink (500ns) ................................................................... 1.5A

Input Voltage (SS, INV, V Operating Junction Temperature

, CT, VID0-VID4) ........................................... -0.3V to 6V

CC_CORE

Plastic (N & D Packages) ...................................................................................... 150°C

Storage Temperature Range .................................................................... -65°C to +150°C

Lead Temperature (Soldering, 10 Seconds) ............................................................. 300°C

Note 1. Exceeding these ratings could cause damage to the device. All voltages are with respect

to Ground. Currents are positive into, negative out of the specified terminal. Pin numbers refer to DIL packages only.

THERMAL DATA

N PACKAGE:

THERMAL RESISTANCE-JUNCTION TO AMBIENT,

D PACKAGE:

THERMAL RESISTANCE-JUNCTION TO AMBIENT,

Junction Temperature Calculation: TJ = TA + (PD x θJA). The θJA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow

θθ

65°C/W

120°C/W

PACKAGE PIN OUTS

1 14

213

INV

312

CC_CORE

411

VID0

510

VID1

VID2 VID3

N PACKAGE — 14-Pin

LX1662/1662A (Top View)

1 16

215

INV

314

CC_CORE

413

VID0

512

VID1

611

VID2

710

VID3

VID4

N PACKAGE — 16-Pin

LX1663/1663A (Top View)

1 14

213

INV

CC_CORE

VID0 VID1 VID2 VID3

312

411

510

D PACKAGE — 14-Pin

LX1662/1662A (Top View)

1 16

215

INV

CC_CORE

VID0 VID1 VID2 VID3 VID4

314

413

512

611

710

D PACKAGE — 16-Pin

LX1663/1663A (Top View)

TDRV GND BDRV V

VID4

TDRV GND BDRV V

OV PWRGD

TDRV GND BDRV V

VID4

TDRV GND BDRV V

OV PWRGD

Rev. 1.1 11/99

PRODUCT DATABOOK 1996/1997

LX1662/62A, LX1663/63A

INGLE-CHIP PROGRAMMABLE

P RODUCTION DATA SHEET

ELECTRICAL CHARACTERISTICS

(

Unless otherwise specified, 10.8 < VCC < 13.2, 0°C ≤ TA ≤ 70°C. Test conditions: VCC = 12V, T = 25°C. Use Application Circuit.

Parameter

Reference & DAC Section (See Table 1 - Next Page)

Regulation Accuracy (See Table 1) (Less 40mV output adaptive positioning), VCC = 12V, I Regulation Accuracy 1.8V ≤ V

Timing Section

Off Time Initial OT V

Off Time Temp Stability V Discharging Current I Ramp Peak V Ramp Peak-Valley V

Ramp Valley Delay to Output 10% Overdrive

Error Comparator Section

Input Bias Current I Input Offset Voltage V EC Delay to Output 10% Overdrive

Current Sense Section

Input Bias Current (V Pulse By Pulse C

CS Delay to Output 10% Overdrive

Pin) I

CC_CORE

LX1662/1663 V LX1662A/1663A Initial Accuracy

Output Drivers Section

Drive Rise Time TRVC1 = VCC = 12V, CL = 3000pF Drive Fall Time TFVC1 = VCC = 12V, CL = 3000pF Drive High V

Drive Low V

Output Pull Down V

UVLO and S.S. Section

Start-Up Threshold V Hysteresis V SS Sink Current I SS Sat Voltage V

Supply Current Section

Dynamic Operating Current I

Power Good / Over-Voltage Protection Section (LX1663 Only)

Lower Threshold (V Hysteresis Power Good Voltage Low I Over-Voltage Threshold (V OVP Sourcing Current VOV = 5V

Symbol

DISVCC_CORE

RPPVCC_CORE

CLP

DHVCC

DLVCC

PDVCC

HYST

OLVC1

= 1.3V, CT = 390pF

CC_CORE

= 3.5V, CT = 390pF

CC_CORE

= 1.3V to 3.5V

CC_CORE

= 1.3V, VCT = 1.5V

= 1.3V

= 3.5V

CC_CORE

1.3V < VSS = V

1.3V < V Initial Accuracy

= VCC = 12V, I

VCC = VCC = 12V, I

= VCC = 12V, I

VCC = VCC = 12V, I

= VC = 0, I

VC1 = 10.1V

= 9V, ISD = 200µA

VCC = VC1 = 12V, Out Freq = 200kHz, CL = 0

/ DAC

CC_CORE

= 5mA

PWRGD

/ V

CC_CORE

PWM C

Test Conditions

≤ 2.8V

OUT

< 3.5V

INV

= V

INV

CC_CORE

SOURCE

SINK

SOURCE

SINK

PULL UP

)

OUT

)

DAC

< 3.5V

= 20mA

= 200mA

= 20mA

= 200mA

= 2mA

ONTROLLERS WITH

5-BIT DAC

= 6A

LOAD

LX1662/1663 (A)

Min. Typ. Max.

-30 30 mV

-1 1 %

180 210 240 µA

0.9 1 1.1 V

0.37 0.42 0.47 V

36 41 46 mV

85 100 115 mV 50 60 70 mV

9.9 10.1 10.4 V

2 5.5 mA

88 90 92 %

110 117 125 %

30 45 mA

)

Units

2µs 1µs

40 ppm

100 ns

0.8 2 µA

200 ns

27 35 µA

200 ns

70 ns 70 ns 11 V 10 V

0.06 0.1 V

0.8 1.2 V

0.8 1.4 V

0.31 V

0.15 0.6 V

27 mA

0.5 0.7 V

PRODUCT DATABOOK 1996/1997

5A/Div.

Time - 100µs/Div.

2.8V 100mV/Div.

Output Load

0 to 14A

Output Voltage

LX1662/62A, LX1663/63A

INGLE-CHIP PROGRAMMABLE

P RODUCTION DATA SHEET

ELECTRICAL CHARACTERISTICS

Table 1 - Adaptive Transient Voltage Output (Output Voltage Setpoint  Typical)

Processor Pins

0 = Ground, 1 = Open (Floating)

VID4 VID3 VID2 VID1 VID0

01111 1.34V 1.30V 01110 1.39V 1.35V 01101 1.44V 1.40V 01100 1.49V 1.45V 01011 1.54V 1.50V 01010 1.59V 1.55V 01001 1.64V 1.60V 01000 1.69V 1.65V 00111 1.74V 1.70V 00110 1.79V 1.75V 00101 1.84V 1.80V 00100 1.89V 1.85V 00011 1.94V 1.90V 00010 1.99V 1.95V 00001 2.04V 2.00V 00000 2.09V 2.05V 11111 2.04V 2.00V 11110 2.14V 2.10V 11101 2.24V 2.20V 11100 2.34V 2.30V 11011 2.44V 2.40V 11010 2.54V 2.50V 11001 2.64V 2.60V 11000 2.74V 2.70V 10111 2.84V 2.80V 10110 2.94V 2.90V 10101 3.04V 3.00V 10100 3.14V 3.10V 10011 3.24V 3.20V 10010 3.34V 3.30V 10001 3.44V 3.40V 10000 3.54V 3.50V

* Nominal = DAC setpoint voltage with no adaptive output voltage positioning.

PWM C

ONTROLLERS WITH

5-BIT DAC

Output Voltage (V

0.0A Nominal Output*

CC_CORE

)

Note:

Adaptive Transient Voltage Output

In order to improve transient response a 40mV offset is built into the Current Sense comparator. At high currents, the peak output voltage will be lower than the nominal set point , as shown in Figure 1. The actual output voltage will be a function of the sense resistor, output current and output ripple.

FIGURE 1 — Output Transient Response

(Using 5mΩ sense resistor and 5µH output inductor)

Rev. 1.1 11/99

PRODUCT DATABOOK 1996/1997

LX1662/62A, LX1663/63A

INGLE-CHIP PROGRAMMABLE

P RODUCTION DATA SHEET

CHARACTERISTICS CURVES

PWM C

ONTROLLERS WITH

5-BIT DAC

EFFICIENCY (%)__

Output Set Point

EFFICIENCY AT 3.1V

1234567891011121314

EFFICIENCY AT 2.8V EFFICIENCY AT 1.8V

OUT

(A)

FIGURE 2 — Efficiency Test Results:

Non-Synchronous Operation, VIN = 5V

100

EFFICIENCY (%)__

Output Set Point

EFFICIENCY AT 3.1V EFFICIENCY AT 2.8V

EFFICIENCY AT 1.8V

1234567891011121314

(A)

OUT

FIGURE 3 — Efficiency Test Results:

Synchronous Operation, VIN = 5V

Output Se t Point

1.8V EFF ICIENCY

1234567891011121314

2.8V EFF ICIENCY

3.3V EFF ICIENCY

(A)

OUT

FIGURE 4 — Efficiency Test Results: Synchronous Operation, VIN = 12V.

Note: Non-synchronous operation not recommended for 12V operation, due to power loss in Schottky diode.

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