US3027 datasheet(3/8 Pages) UNISEM

Part #	US3027

Description	5 BIT PROGRAMMABLE SYNCHRONOUS BUCK PLUS TRIPPLE LDO CONTROLLER

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US3027

4-3

Rev. 1.3

12/8/00

Error Comparator Section

Input bias current

2

uA

Input Offset Voltage

-2

+2

mV

Delay to Output

Vdiff=10mV

100

nS

Current Limit Section

C.S Threshold Set Current

200

uA

C.S Comp Offset Voltage

-5

+5

mV

Hiccup Duty Cycle

Css=0.1 uF

10

%

Output Drivers Section

Rise Time

CL=3000pF

70

nS

Fall Time

CL=3000pF

70

nS

Dead band Time Between

High side and Synch Drive

(Vcore Switcher Only)

CL=3000pF

200

nS

Oscillator Section (internal)

Osc Frequency

Rt=Open

217

Khz

1.8V Regulator (Vsen 4)

Vsense Voltage

Vo4

Ta=25, Drive4 = Vsen4

1.800

V

Vsense Voltage

1.800

V

Input bias current

2

uA

Output Drive Current

Vaux-Vdrive>0.6V

50

mA

1.5V Regulator (Vsen 3)

Vsense Voltage

Vo3

Ta=25, Drive3 = Vsen3

1.500

V

Vsense Voltage

1.500

V

Input bias current

2

uA

Output Drive Current

Vaux-Vdrive>0.6V

50

mA

Power Good Section

Vsen1 UV lower trip point

Vsen1 ramping down

0.90Vs

V

Vsen1 UV upper trip point

Vsen1 ramping up

0.92Vs

V

Vsen1 UV Hysterises

.02Vs

V

Vsen1 HV upper trip point

Vsen1 ramping up

1.10Vs

V

Vsen1 HV lower trip point

Vsen1 ramping down

1.08Vs

V

Vsen1 HV Hysterises

.02Vs

V

Vsen2 trip point

Select<0.8V

1.100

V

Select>2V

2.560

V

Vsen4 trip point

Fix=GND

0.920

V

Fix=Open

1.320

V

Vsen3 trip point

Fix=GND

0.920

V

Fix=Open

1.140

V

Power Good Output LO

RL=3mA

0.4

V

Power Good Output HI

RL=5K pull up to 5V

4.8

V

Fault (Overvoltage) Section

Core O.V. upper trip point

Vsen1 ramping up

1.17Vs

V

Core O.V. lower trip point

Vsen1 ramping down

1.15Vs

V

FAULT Output HI

Io=3mA

10

V

Soft Start Section

Soft Start Current

OCset=0V , Phase=5V

20

uA

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