AAT2801 datasheet(4/20 Pages) ANALOGICTECH

Part #	AAT2801

Description	Multi-Mode Charge Pump for White LED Backlight and Flash Applications

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Manufacturer	ANALOGICTECH [Advanced Analogic Technologies]

Direct Link	http://www.analogictech.com

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Electrical Characteristics1

CIN = CCP = CF = C1 = C2 = C3 = 1.0µF; TA = -40°C to 85°C, unless otherwise noted.

Symbol

Description

Conditions

Min Typ Max Units

Input Power Supply

VIN

Operation Range

2.7

5.5

V

3.0

≤ VIN ≤ 5.5, No Load Current; VOUT_FLSH

-

3.0

4.5

= 5V, EN/SET = GND, EN_FLSH = VIN

ICC

Operating Current

3.0

≤ VIN ≤ 5.5, EN/SET = VIN, EN_FLSH =

0.55

mA

GND, VD1:VD4 = 2.0V, CP = 1X

3.0

≤ VIN ≤ 5.5, No Load Current; EN/SET =

-

3.0

5.0

VIN, EN_FLSH = GND, CP = 1.5X

ISHDN

Shutdown Current

EN_FLSH = EN/SET = 0

-

1.0

µA

IDX

Output Current Accuracy2

VIN = 3.5, Code = 32, TA = 25°C

-10

10

%

I(D-Match)

Current Matching3

VD1:D4 = 3.6, VIN = 3.5V; LED Charge

-3.0 ±0.5

3.0

%

Pump Only

VOUT

Flash Charge Pump Output

3.0V < VIN < 5V, IOUT = 120mA;

4.3

4.5

4.7

V

Voltage

EN_FLSH = VIN

IOUT

Maximum Continuous IOUT

VIN = 3.6V; VOUT = 4.5V; EN_FLSH = VIN

120

-

mA

Maximum Pulsed IOUT

VIN = 3.6V; VOUT = 4.5V; IPulsed < 500mS

250

-

ηCP

White LED Charge Pump

VIN = 3.5V, IOUT(TOTAL) = 120mA,

93

%

Section Efficiency

Measured from IN to CP

Charge Pump Section

TSS

Soft-Start Time

Backlight Charge Pump

50

µs

Flash Charge Pump

200

FCLK

Clock Frequency

1.0

MHz

EN/SET

VEN(L)

Enable Threshold Low

-

0.4

V

VEN(H)

Enable Threshold High

1.4

-

V

TEN/SET LO

EN/SET Low Time

VEN/SET < 0.6V

0.3

75

µs

TEN/SET HI MIN

Minimum EN/SET High Time VEN/SET > 1.4V

50

µs

TEN/SET HI MAX Maximum EN/SET High Time VEN/SET > 1.4V

-

75

µs

TOFF

EN/SET Off Timeout

VEN/SET < 0.6V

-

500

µs

TLAT

EN/SET Latch Timeout

VEN/SET > 1.4V

-

500

µs

IEN/SET/EN_FLSH Input Leakage

VEN/SET/EN_FLSH = 5V, VIN = 5V

-1.0

1.0

µA

AAT2801

Multi-Mode Charge Pump for

White LED Backlight and Flash Applications

4

2801.2006.04.1.3

1. The AAT2801 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.

2. Codes 2 through 7 are guaranteed to be within ±15% of stated current level.

3. Current matching is defined as I(D-Match) = (ID - IAVE)/IAVE.

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