UC2832-EP

PRECISION LOW DROPOUT LINEAR CONTROLLER

SGLS147A – JANUARY 2003 – REVISED MARCH 2003

4

POST OFFICE BOX 655303

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNITS

Timer

Inactive leakage current

C/S(+) = C/S(–) = +VIN,

TRC pin = 2 V

0.25

1

µA

Active pull-up current

C/S(+) = +VIN,

C/S(–) = +VIN – 0.4 V,

TRC pin = 0 V

–345

–270

–175

µA

Duty ratio (See Note 1)

ontime/period,

RT = 200 kΩ,

CT = 0.27 µF

4.8

%

Period (See Notes 1 and 2)

ontime + offtime,

RT = 200 kΩ,

CT = 0.27 µF

36

ms

Upper trip threshold (Vu)

1.8

V

Lower trip threshold (Vl)

0.9

V

Trip threshold ratio

Vu / Vl

2.0

V/V

Error Amplifier Section

Input offset voltage

VCM = VCOMP = 2 V

–8

8

mV

Input bias current

VCM = VCOMP = 2 V

–4.5

–1.1

µA

Input offset current

VCM = VCOMP = 2 V

–1.5

1.5

µA

Open loop voltage gain (AVOL)

VCOMP = 1 V to 13 V

50

70

dB

Common mode rejection ratio (CMRR)

VCM = 0 V to +VIN – 3 V

60

80

dB

PSRR

VCM = 2 V, +VIN = 4.5 V to 36 V

90

dB

Transconductance

ICOMP = "10 µA

4.3

ms

High-level output voltage (VOH)

ICOMP = 0,

Volts below +VIN

0.95

1.3

V

Low-level output voltage (VOL)

ICOMP = 0

4.5

0.7

V

Output high current (IOH)

VCOMP = 2 V

–700

–500

–100

µA

Output low current (I

)

V2 V

C/S(–) = +VIN

100

500

700

µA

Output low current (IOL)

VCOMP = 2 V

C/S(–) = +VIN – 0.4 V

2

6

mA

NOTES:

1. These parameters are first-order supply-independent, however, both may vary with supply for +VIN less than about 4 V. This supply

variation will cause a slight change in the timer period and duty cycle, although a high off-time/on-time ratio will be maintained.

2. With recommended RT value of 200 kΩ, TOFF ≈ RT CT * ln(Vu/Vl) "10%.