SYNCHRONOUS PWM CONTROLLER WITH

DUAL LOW DROPOUT REGULATOR

CONTROLLERS

© 2000 SEMTECH CORP.

PRELIMINARY - October 16, 2000

SC1109

2

TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com

Parameter

Symbol

Maximum

Units

VCC to GND

-0.3 to +7

V

STBY to GND

-0.3 to +7

V

BST to GND

-0.3 to +15

V

PHASE to GND

-1 to +8

V

LDOSx

-0.3 to 5

V

Operating Temperature Range

T

A

0 to +70

°C

Junction Temperature Range

T

J

0 to +125

°C

Storage Temperature Range

T

STG

-65 to +150

°C

Lead Temperature (Soldering) 10 seconds

T

L

300

°C

Thermal Impedance Junction to Ambient

θ

JA

130

°C/W

Thermal Impedance Junction to Case

θ

JC

30

°C/W

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

Unless specified: VOSENSE = V

PARAMETER

SYM

CONDITIONS

MIN

TYP

MAX

UNITS

Supply (V

Supply Voltage

V

CC

4.4

5

5.25

V

Supply Quiescent current

I

CCQ

V

6

8

12

mA

Supply Operating current

I

CC

V

20

mA

Switching Section

Output Voltage

(1)

V

TT

I

1.188

1.200

1.212

V

Load Regulation

(1)

LOAD

REG

I

1

%

Line Regulation

(1)

LINE

REG

Vin=4.75V to 5.25V

±0.15

%

Oscillator Frequency

f

OSC

175

200

225

kHz

Oscillator Max Duty Cycle

D

90

95

%

Current Limit trip (Vin-V

Vtrip

Ilimit

180

200

220

mV

Gain (A

(3)

GAIN

VTT

VOSENSE to V

O

35

dB

Under Voltage Lock Out

Threashold

VCC

HIGH

4.2

V

Hysteresis

VCC

HYST

200

mV

Power Good

Power Good Threshold Voltage

PG

th

88

112

%

Soft Start / Enable

SS/EN Source current

(2)

Isource

SS/EN

V

10

µA

SS/EN Sink current

(2)

Isink

SS/EN

V

2

µA

Shutdown Voltage

V

SS/EN

600

mV

Note:

Exceeding the Absolute Maximum Ratings may cause irreversible damage to the device.