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AAT3153

更新时间：2024-09-18 03:15:35

品牌：ANALOGICTECH

描述：High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications

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AAT3153 概述

High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications 高效率1X / 1.5X / 2X电荷泵白光LED应用

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AAT3153

High Efficiency 1X/1.5X/2X Charge Pump

For White LED Applications

™

ChargePump

General Description

Features

The AAT3153 is a low noise, constant frequency

charge pump DC/DC converter that uses a tri-mode

load switch (1X), fractional (1.5X), and doubling (2X)

conversion to maximize efficiency for white LED

applications. The AAT3153 is capable of driving six-

channel LEDs from a 2.7V to 5.5V input. The current

sinks may be operated individually or in parallel for

driving higher-current LEDs. Low external parts

count (two 1µF flying capacitors and two small 1µF

capacitors at V_INand V_OUT) makes this part ideally

suited for small battery-powered applications.

•

V_INRange: 2.7V to 5.5V

Fully Programmable Current with Single Wire

•

Eight-Step Current: 20mA-50µA

Individual Main-Sub Group Control

Low I_Q(40µA) at Light Load

•

Tri-Mode 1X, 1.5X, and 2X Charge Pump for

Maximum Efficiency and V_FCoverage

Drives Up to Six Channels of LEDs

No Inductors, Low Noise Operation

1MHz Constant Switching Frequency

Small Application Circuit

Built-In Thermal Protection

Built-In Auto-Disable for Short-Circuit

Automatic Soft-Start

•

AnalogicTech's S²Cwire™ (Simple Serial Control™)

serial digital input is used to enable, disable, and

set current for each LED with eight settings (20mA

down to 50µA) including main and sub-display

group control. The AAT3153 consumes extremely

low current internally (40µA typical) at light load for

optimized efficiency.

I_Q<1µA in Shutdown

Thermal-Enhanced 4x4mm16-Pin QFN

Package

Each output of the AAT3153 is equipped with built-

in protection for V_OUTshort circuit and auto-disable

for load short-circuit condition. Built-in soft-start cir-

cuitry prevents excessive inrush current during

start-up. A low current shutdown feature discon-

nects the load from V_INand reduces quiescent cur-

rent to less than 1µA.

Applications

•

Color (RGB) Lighting

Programmable Current Sinks

White LED Backlighting

White Photo-Flash for DSCs

TheAAT3153 is available in a space-saving, thermal-

enhanced 16-pin 4x4mm QFN package.

Typical Application

VIN

2.7V to 5.5V

C1+

1µF

C_IN

1µF

C1-

C2+

1µF

AAT3153

C2-

VOUT

C_OUT

1µF

EN/SET

GND

3153.2004.10.0.6

AAT3153

High Efficiency 1X/1.5X/2X Charge Pump

For White LED Applications

Pin Descriptions

Pin #

Symbol

Function

Current sink input #6.

EN/SET

N/C

S²Cwire serial interface control pin.

No connection.

VOUT

Charge pump output to drive load circuit. Requires 1µF capacitor connected

between this pin and ground.

C2+

C1+

C1-

C2-

GND

Flying capacitor 2 + terminal. Connect a 1µF capacitor between C2+ and C2-.

Flying capacitor 1 + terminal. Connect a 1µF capacitor between C1+ and C1-.

Flying capacitor 1 - terminal.

Flying capacitor 2 - terminal.

Ground.

Input power supply. Requires 1µF capacitor connected between this pin and

ground.

GND

Ground.

Current sink input #1.

Current sink input #2.

Current sink input #3.

Current sink input #4.

Current sink input #5.

Exposed paddle (bottom). Connect to ground.

Pin Configuration

QFN44-16

(Top View)

EN/SET

N/C

GND

AAT3153

VOUT

GND

3153.2004.10.0.6

AAT3153

High Efficiency 1X/1.5X/2X Charge Pump

For White LED Applications

Absolute Maximum Ratings¹

Symbol

Description

Value

Units

V_IN

Input Voltage

-0.3 to 6

-0.3 to V_IN+ 0.3

150

V_EN/SET

EN/SET to GND Voltage

I_OUT

Maximum DC Output Current

Operating Junction Temperature Range

Maximum Soldering Temperature (at leads, 10 sec)

°C

T_J

-40 to 150

300

T_LEAD

Notes:

1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at condi-

tions other than the operating conditions specified is not implied. Only one Absolute Maximum Rating should be applied at any one time.

2. Based on long-term current density limitation.

Thermal Information

Symbol

Description

Value

Units

P_D

Maximum Power Dissipation^{1, 2}

Maximum Thermal Resistance¹

TBD

θ_JA

°C/W

Notes:

1. Mounted on an FR4 board.

2. Derate 6.25 mW/ C above 25°C.

3153.2004.10.0.6

AAT3153

High Efficiency 1X/1.5X/2X Charge Pump

For White LED Applications

Electrical Characteristics¹

C_IN= C_OUT= C1 = C2 = 1.0µF; T_A= -40°C - 85 C, unless otherwise noted.

Typical values are at T_A= 25°C, V_IN= 3.6V.

Symbol

Description

Conditions

Min Typ Max Units

Input Power Supply

V_INOperation Range

2.7

5.5

1X Mode, 3.0 ≤ V_IN≤ 5.5, Active,

No Load Current

0.3

1.5X Mode, 3.0 ≤ V_IN≤ 5.5, Active,

No Load Current

I_CC

Operating Current

2X Mode, 3.0 ≤ V_IN≤ 5.5, Active,

No Load Current

TBD TBD

50µA Setting, 1X Mode

EN/SET=0

µA

I_SHDN

I_DX

I_(D-Match)

V_TH

Shutdown Current

I_SINKAverage Current Accuracy

Current Matching (Note 2)

1X to 1.5X or 1.5X to 2X Transition

Threshold at Any I_SINKPin

I_SET= 30mA, T_A= 25°C

V_F:D1:D6 = 3.6V

0.5

150

Charge Pump Section

T_SS

F_CLK

Soft-Start Time

100

µs

Clock Frequency

1000

kHz

EN/SET

V_EN(L)

Enable Threshold Low

Enable Threshold High

EN/SET Low Time

0.4

V_EN(H)

1.4

0.3

T_{EN/SET LO}

T_{EN/SET HI}

T_OFF

V_EN/SET< 0.6V

V_EN/SET> 1.4V

V_EN/SET< 0.6V

V_EN/SET> 1.4V

µs

µA

Minimum EN/SET High Time

EN/SET Off Timeout

500

T_LAT

EN/SET Latch Timeout

EN/SET Input Leakage

I_EN/SET

-1

Notes:

1. The AAT3153 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. Current matching is defined as the deviation of any sink current from the average of all active channels.

3153.2004.10.0.6

AAT3153

High Efficiency 1X/1.5X/2X Charge Pump

For White LED Applications

Typical Characteristics

Efficiency vs. Supply Voltage

Turn On to 1X Mode

V_IN= 4.2V, D_X= 20mA

100

4.1mA

10.2mA

20mA

(2V/div)

V_SINK

(500mV/div)

I_IN

(100mA/div)

2.8

3.0

3.2

3.4

3.6

3.8

4.0

4.2

Supply Voltage (V)

100µs/div

Turn On to 1.5X Mode

V_IN= 3.5V, D_X= 20mA

Turn On to 2X Mode

V_IN= 2.8V, D_X= 20mA

(2V/div)

V_SINK

(500mV/div)

V_SINK

(500mV/div)

I_IN

(100mA/div)

I_IN

(100mA/div)

100µµs/div

100µs/div

Turn Off from 1.5X Mode

V_IN= 3.5V, D_X= 20mA

(2V/div)

V_F

(1V/div)

I_IN

(200mA/div)

200µµs/div

3153.2004.10.0.6

AAT3153

High Efficiency 1X/1.5X/2X Charge Pump

For White LED Applications

Functional Block Diagram

C1+ C1- C2+ C2-

1X, 1.5X and 2X

Charge Pump

VIN

VOUT

Soft-Start

Control

1MHz

Oscillator

Voltage

Reference

D/A

6 x 16 bit

ROM

S²C

Interface

EN/SET

6 x 16 bit

ROM

GND

automatically transition to 2X mode. The AAT3153

requires only four external components: two 1µF

ceramic capacitors for the charge pump flying

capacitors (C1 and C2), one 1µF ceramic input

capacitor (C_IN), and one 0.33µF to 1µF ceramic

charge pump output capacitor (C_OUT).

Functional Description

The AAT3153 is a tri-mode load switch (1X) and

high efficiency (1.5X or 2X) charge pump device

intended for white LED backlight applications. To

maximize power conversion efficiency, an internal

sensing circuit monitors the voltage required on

each constant current sink input and sets the load

switch and charge pump modes based on the input

battery voltage and the current sink input voltage.

As the battery discharges over time, the AAT3153

charge pump is enabled when any of the four cur-

rent sink inputs near dropout. The charge pump ini-

tially starts in 1.5X mode. If the charge pump out-

put drops enough for any current source output to

become close to dropout, the charge pump will

The six constant current sink inputs (D1 to D6) can

drive six individual LEDs with a maximum current

of 20mA each. The unused sink inputs must be

connected to V_OUT, otherwise the part will operate

only in 2X charge pump mode. The S²Cwire serial

interface enables the AAT3153 and sets the cur-

rent sink magnitudes. S²Cwire addressing allows

independent control of two groups of current sink

input: D1-D4 and D5-D6.

3153.2004.10.0.6

AAT3153

High Efficiency 1X/1.5X/2X Charge Pump

For White LED Applications

Constant Current Output Level Settings

AAT3153 Current Setting

The constant current sink levels for D1 to D6 are

set via the serial interface. No PWM (pulse width

modulation) or additional control circuitry is needed

to control LED brightness. This feature greatly

reduces the burden on a microcontroller or system

IC to manage LED or display brightness, allowing

the user to "set it and forget it." With its high-speed

serial interface (up to 1MHz data rate), the input

sink current of the AAT3153 can be changed suc-

cessively to brighten or dim LEDs, giving the users

real-time control of LED brightness. Because the

inputs D1 to D6 are true independent constant cur-

rent sinks, the voltage observed on any single

given input will be determined by the actual forward

voltage (V_F) for the LED being driven.

Data

Main Group

(D1-D4)

Sub Group

(D5-D6)

I_OUT(mA)

S²Cwire Serial Interface

0.05

0.5

0.05

0.5

The current sink input magnitude on the AAT3153

is controlled by AnalogicTech's S²Cwire serial digi-

tal input. It relies on the number of rising edges of

the EN/SET pin to address and load the registers.

S²Cwire latches data or address after the EN/SET

pin has been held high for time T_LAT. The interface

records rising edges of the EN/SET pin and

decodes them into 16 different states, as indicated

in the Current Setting table. There are four bright-

ness levels for the main or sub-display group with

the possibility of individually turning ON or OFF

each group. To further optimize power efficiency,

the AAT3153 also offers four low-current levels for

dim LED operation (data 13-16). During this low-

current mode, the internal supply current reduces

to only 40µA typical.

The EN/SET timing is designed to accommodate a

wide range of data rates. After the first rising edge

of EN/SET, the charge pump is enabled and reach-

es full capacity after the soft-start time (T_SS). During

the soft-start time, multiple clock pulses may be

entered on the EN/SET pin to set the final output

current level with a single burst of clocks.

Alternatively, the EN/SET clock pulses may be

entered one at a time to gradually increase the

LED brightness over any desired time period. The

current outputs remain constant as long as

EN/SET remains in a logic high state. The current

outputs are switched off after EN/SET has

remained in a low state for at least the T_OFFtimeout

period; then, the AAT3153 enters shutdown mode

and draws less than 1µA from V_IN. Data are reset

to 0 during shutdown.

The counter can be clocked at speeds up to 1MHz,

such that intermediate states are not visible. The

first rising edge of EN/SET enables the IC and ini-

tially sets the output LED current to 20mA. Once

the final clock cycle is input for the desired bright-

ness level, the EN/SET pin is held high to maintain

the device output current at the programmed level.

The device is disabled 500µs (T_OFF) after the

EN/SET pin transitions to a logic low state.

3153.2004.10.0.6

AAT3153

High Efficiency 1X/1.5X/2X Charge Pump

For White LED Applications

S²Cwire Serial Interface Timing

t_HI

t_OFF

t_LO

EN/SET

OFF

Code

instances (e.g., in high-luminous-output applica-

tions such as photo-flash), it may be necessary to

drive high-V_Ftype LEDs. The low-dropout current-

sinks in the AAT3153 make it capable of driving

LEDs with forward voltages as high as 4.7V at full

current from an input supply as low as 3.0V.

Outputs can be paralleled to drive high-current

LEDs without complication.

Auto-Disable Feature

The AAT3153 is equipped with an "auto-disable"

feature for each LED channel. After the IC is

enabled and started up, a test current of 10µA (typ-

ical) is forced through each sink channel. The

channel will be disabled if the voltage of that par-

ticular SINK pin does not drop to certain threshold.

This feature is very convenient for disabling an

unused channel or during an LED fail short event.

Device Switching Noise Performance

The AAT3153 operates at a fixed frequency of

approximately 1MHz to control noise and limit har-

monics that can interfere with the RF operation of

cellular telephone handsets or other communica-

tion devices. Back-injected noise appearing on the

input pin of the charge pump is 20mV peak-to-

peak, typically ten times less than inductor-based

DC/DC boost converter white LED backlight solu-

tions. The AAT3153 soft-start feature prevents

noise transient effects associated with in-rush cur-

rents during start up of the charge pump circuit.

Thermal Protection

The AAT3153 has a built-in thermal protection cir-

cuit that will shut down the charge pump if the die

temperature rises above the thermal limit, as is the

case during a short circuit of the V_OUTpin.

Applications Information

LED Selection

Although the AAT3153 is specifically intended for

driving white LEDs, the device can also be used to

drive most types of LEDs with forward voltage

specifications ranging from 2.0V to 4.7V. LED

applications may include main and sub-LCD dis-

play backlighting, camera photo-flash applications,

color (RGB) LEDs, infrared (IR) diodes for remotes,

and other loads benefiting from a controlled output

current generated from a varying input voltage.

Since the D1 to D6 input current sinks are matched

with negligible voltage dependence, the LED

brightness will be matched regardless of the spe-

cific LED forward voltage (V_F) levels. In some

Capacitor Selection

Careful selection of the four external capacitors

C_IN, C1, C2, and C_OUTis important because they

will affect turn-on time, output ripple, and transient

performance. Optimum performance will be

obtained when low Equivalent Series Resistance

(ESR) (<100mΩ) ceramic capacitors are used. In

general, low ESR may be defined as less than

100mΩ. A capacitor value of 1µF for all four capac-

itors is a good starting point when choosing capac-

itors. If the LED current sources are only pro-

grammed for light current levels, then the capacitor

size may be decreased.

3153.2004.10.0.6

AAT3153

High Efficiency 1X/1.5X/2X Charge Pump

For White LED Applications

Capacitor Characteristics

Ceramic Capacitor Materials

Ceramic composition capacitors are highly recom-

mended over all other types of capacitors for use

with the AAT3153. Ceramic capacitors offer many

advantages over their tantalum and aluminum elec-

trolytic counterparts. A ceramic capacitor typically

has very low ESR, is lowest cost, has a smaller

PCB footprint, and is non-polarized. Low ESR

ceramic capacitors help to maximize charge pump

transient response. Since ceramic capacitors are

non-polarized, they are not prone to incorrect con-

nection damage.

Ceramic capacitors less than 0.1µF are typically

made from NPO or COG materials. NPO and COG

materials typically have tight tolerance and are sta-

ble over temperature. Larger capacitor values are

typically composed of X7R, X5R, Z5U, or Y5V

dielectric materials. Large ceramic capacitors, typ-

ically greater than 2.2µF, are often available in low-

cost Y5V and Z5U dielectrics, but capacitors

greater than 1µF are typically not required for

AAT3153 applications. Capacitor area is another

contributor to ESR. Capacitors that are physically

large will have a lower ESR when compared to an

equivalent material smaller capacitor. These larger

devices can improve circuit transient response

when compared to an equal value capacitor in a

smaller package size.

Equivalent Series Resistance

ESR is an important characteristic to consider

when selecting a capacitor. ESR is a resistance

internal to a capacitor which is caused by the leads,

internal connections, size or area, material compo-

sition, and ambient temperature. Capacitor ESR is

typically measured in milliohms for ceramic capac-

itors and can range to more than several ohms for

tantalum or aluminum electrolytic capacitors.

Thermal Protection

The AAT3153 has a built-in thermal protection cir-

cuit that will shut down the charge pump if the die

temperature rises above the thermal limit, as is the

case during a short circuit of the V_OUTpin.

3153.2004.10.0.6

AAT3153

High Efficiency 1X/1.5X/2X Charge Pump

For White LED Applications

Ordering Information

Package

Marking¹

Part Number (Tape and Reel)

QFN44-16

Package Information

Pin 1 Identification

0.330 0.050

Pin 1 Dot By Marking

R0.030Max

4.000 0.050

2.280 REF

Top View

Bottom View

0.203 0.025

Side View

All dimensions in millimeters.

AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech product. No circuit patent licenses, copyrights, mask work

rights, or other intellectual property rights are implied.

AnalogicTech reserves the right to make changes to their products or specifications or to discontinue any product or service without notice, and advise customers to obtain the latest

version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale

supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability.

AnalogicTech warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with AnalogicTech’s standard warranty. Testing and

other quality control techniques are utilized to the extent AnalogicTech deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily

performed.

Advanced Analogic Technologies, Inc.

830 E. Arques Avenue, Sunnyvale, CA 94085

Phone (408) 737-4600

Fax (408) 737-4611

3153.2004.10.0.6

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