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LX1668CDW

PROGRAMMABLE MULTIPLE OUTPUT DC:DC CONTROLLER

Microsemi Corporation 

PRODUCT DATABOOK 1996/1997

P ROGRAMMABLE MULTIPLE OUTPUT DC:DC CONTROLLER

PR O D U C T I O N D ATA S H E E T

LX1668

ELECTRICAL CHARACTERISTICS

(Unless otherwise specified, 4.75V < VCC5 < 5.25V and 10.8V < VCC12 < 13.2V, 0°C ≤ TA ≤ 70°C. Test conditions: VCC3 = VCC5, VCC5 = 5V, VCC12 = 12V,

T = 25°C.)

Parameter

Symbol

Test Conditions

Reference & DAC

Initial Accuracy

Cumulative Regulation Accuracy

Timing

VCORE

(Less 40mV output adaptive positioning), 1.3V ≤ VCORE ≤ 35V, T = 25°C

1.3V ≤ VCORE ≤ 3.5V

Off Time

Swicthing Frequency

Error Comparator / CS-

OT

Freq

VCORE = 2.0V

VCORE = 1.3V to 3.5V

Input Bias Current

EC Delay to Output

Current Sense +

IFB 1.0V < VSS = VFB < 3.5V

Overdrive ≤ 5mV

Input Resistance

Pulse By Pulse Current Limit

Current Sense Delay To Output

RCORE

VCLP

0V < VFB = VCORE < 3.5V

Overdrive ≤ 5mV

Output Drivers

Drive Rise Time, Fall Time

Drive High

Drive Low

UVLO and Soft-Start (SS)

TRF CL = 3000pF

VDH

ISOURCE = 20mA

V DL

ISINK = 20mA

VCC5 Start-Up Threshold

Hysteresis

VST

VCC12 > 3.9V

SS Resistor

SS Output Enable

Hiccup Duty Cycle

Supply Current

RSS

VEN

DCHIC

CSS = 0.1µF, VDAC = 2.00V, FREQ = 100Hz

VCC12 Dynamic Supply Current

ICD Out Freq = 200kHz, CL = 3000pF, Synch., VSS > 0.5V

Static Supply Current

12V

IVCC12 VSS < 0.5V

5V

IVCC5 VSS < 0.5V

3.3V

IVCC3 VSS < 0.5V

Power Good / Over-Voltage Protection (OVP)

Threshold

Hysteresis

(VCORE / VSET) VCORE rising, VOUT2 ≥ 2.0V

(VCORE / VSET) VCORE falling, VOUT2 ≥ 2.0V

Power Good Voltage Low

Over-Voltage Threshold

OVP Sourcing Current

Fixed Linear Regulator (VOUT2)

Voltage Reference Tolerance

Regulation

Current Limit

Linear Regulator Controller

IPWRGD = 4mA

(VCORE / VSET), VCORE rising

VOVP = 2.0V

VOUT2 = 2.5V, COUT = 220µF

-10mA ≤ IOUT2 ≤ -150mA

VOUT2 ≤ 2V

Voltage Reference Tolerance

Source Current

Sink Current

VID Pins

VLFB = 1.5V, COUT = 330µF

ILDRV ILDRV flows from VCC12

ILDRV

Low Input

High Input

VIL Internally pulled up to VCC5 thru 30k

VIH

LX1668

Units

Min. Typ. Max.

-1

+1

%

-1.5

1.5

%

2.4

µs

250

kHz

-0.3

-1

µA

100

ns

12

kΩ

45

60

mV

100

ns

100

ns

10

11

V

0.1

V

3.9 4.2 4.6

V

0.10

V

18

kΩ

0.4 0.5

V

10

%

24

mA

6

9

mA

13

18

mA

0.4

2

mA

108 110 111

%

90

91

92

%

2

%

0.5 0.7

V

110 117 125

%

35

60

mA

-2.3

+2.0

%

-1

+1

%

250

mA

-2.3

+1.5

%

30

mA

0.2

mA

0.8

V

2.0

V

Copyright © 1999

Rev. 1.0 4/99

3

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