AAT3122 datasheet(4/12 Pages) AAT

Part #	AAT3122

Description	High Efficiency 1X/1.5X Fractional Charge Pump for White LED Applications

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Manufacturer	AAT [Advanced Analog Technology, Inc.]

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AAT3122

High Efficiency 1X/1.5X Fractional Charge

Pump for White LED Applications

4

3122.2005.11.1.3

Electrical Characteristics

1

V

IN = 3.5V; CIN = COUT = C1 = C2 = 1.0µF; TA = -40°C to +85°C. Unless otherwise noted, typical values are

T

A = 25°C.

Symbol

Description

Conditions

Min

Typ

Max

Units

Input Power Supply

V

IN

Operation Range

2.7

5.5

V

I

cc

Operating Current

3.0

≤ V

IN ≤ 5.5, Active,

1.8

3.5

mA

No Load Current

I

SHDN

Shutdown Current

EN = 0

1.0

µA

I

D

Maximum Output Current

V

IN = 3.5V; Code = 32

108

120

132

mA

Charge Pump

T

SS

Soft-Start Time

200

µs

F

CLK

Clock Frequency

1000

kHz

η

CP

Charge Pump Efficiency

V

IN = 3.6V, IOUT(Total) = 120mA;

93

%

Measured from IN to OUT

EN/SET

V

EN(L)

Enable Threshold Low

V

IN = 2.7V to 5.5V

0.5

V

EN(H)

Enable Threshold High

V

IN = 2.7V to 5.5V

1.4

V

T

LO

EN/SET Low Time

0.3

75

µs

T

HI

Minimum EN/SET High Time

50

ns

T

OFF

EN/SET Off Timeout

500

µs

Input Current

EN/SET Input Leakage

-1.0

1.0

µA

1. The AAT3122 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured

by design, characterization, and correlation with statistical process controls.

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