LM2796TL [NSC]

Dual-Display White LED Driver with 3/2x Switched Capacitor Boost; 双显示白光LED驱动器，带有3 / 2次开关电容升压


型号：	LM2796TL
厂家：	National Semiconductor
描述：	Dual-Display White LED Driver with 3/2x Switched Capacitor Boost 双显示白光LED驱动器，带有3 / 2次开关电容升压驱动器开关
文件：	总8页 (文件大小：171K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

February 2004

LM2796

Dual-Display White LED Driver with 3/2x Switched

Capacitor Boost

General Description

Features

n Drives up to 7 LEDs with up to 20mA each

The LM2796 is a charge-pump based white-LED driver that

is ideal for mobile phone display backlighting. It can drive up

to 7 LEDs in parallel with up to 20mA through each LED.

Regulated internal current sources deliver excellent current

and brightness matching in all LEDs. The LED-driver current

sources are split into two independently controlled groups.

The primary group (4 LEDs) can be used to backlight the

main phone display. The second group (3 LEDs) can be

used to backlight a secondary display or to provide other

lighting features (keypad LEDs, for example). Brightness of

the two groups can be adjusted independently with pulse-

width modulated (PWM) digital signals.

n LEDs controlled in 2 Distinct Groups, for Backlighting 2

Displays (main LCD and sub-LCD)

n Excellent Current and Brightness Matching

n High-Efficiency 3/2x Charge Pump

n Extended Li-Ion Input: 2.7V to 5.5V

n PWM Brightness Control: 100Hz - 1kHz

n 18-bump Thin Micro SMD Package:

(2.1mm x 2.4mm x 0.6mm)

Applications

n Mobile Phone Display Lighting

n Mobile Phone Keypad Lighting

n PDAs

The LM2796 works off an extended Li-Ion input voltage

range (2.7V to 5.5V). Voltage boost is achieved with a high-

efficiency 3/2x-gain charge pump.

The LM2796 is available in National’s chip-scale 18-bump

micro SMD package.

n General LED Lighting

Typical Application Circuit

20093801

DS200938

www.national.com

Connection Diagram

18-Bump Thin Micro SMD Package, Large Bump

NS Package Number TLA18

20093802

Pin Description

Pin #s

Pin Names

Pin Descriptions

V_IN

GND

Input voltage. Input range: 2.7V to 5.5V.

Ground

P_OUT

Charge pump output. Approximately 1.5xV_IN

Flying capacitor connections.

A1, B2, A5, E1

C1+, C1-, C2+,

C2-

Enable pin. Logic input. High = normal operation, Low = shutdown (charge

pump and all current sources OFF).

D6, E5, D4, E3

D1A, D2A, D3A,

D4A

LED Outputs - Group A

C5, B4, C3

D1B, D2B, D3B

EN-A

LED Outputs - Group B

Enable for Group-A LEDs (current outputs). Logic input.

High = Group-A LEDs ON. Low = Group A LEDs OFF.

Pulsing this pin with a PWM signal (100Hz-1kHz) can be used to dim LEDs.

Enable for Group-B LEDs (current outputs). Logic input.

High = Group-B LEDs ON. Low = Group B LEDs OFF.

Pulsing this pin with a PWM signal (100Hz-1kHz) can be used to dim LEDs.

Placing a resistor (R_SET) between this pin and GND sets the LED current for

all LEDs. LED Current = 100 x (1.25V ÷ R_SET).

EN-B

I_SET

Ordering Information

Order Information

LM2796TL

Package

Supplied As

TLA18 Micro SMD

250 Units, Tape & Reel

3000 Units, Tape & Reel

LM2796TLX

www.national.com

Absolute Maximum Ratings (Notes 1, 2)

Operating Rating (Notes 1, 2)

Input Voltage Range

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

2.7V to 5.5V

-30˚C to +125˚C

-30˚C to +85˚C

Junction Temperature (T_J) Range

Ambient Temperature (T_A) Range

(Note 5)

V_INpin voltage

-0.3V to 7.1V

-0.3V to (V_IN+0.3V)

w/ 5.6V max

EN, ENA, ENB pin voltages

Thermal Properties

Juntion-to-Ambient Thermal

Continuous Power Dissipation

(Note 3)

Internally Limited

100˚C/W

Junction Temperature (T_J-MAX

Storage Temperature Range

Maximum Lead Temperature

(Soldering, 10 sec.)

)

150^oC

-65^oC to +150^oC

265^oC

Resistance (θ_JA), (Note 6)

ESD Rating (Note 4)Human Body

Model:

2.0kV

200V

Machine Model

Electrical Characteristics (Notes 2, 7)

Limits in standard typeface and typical values apply for T_J= 25^oC. Limits in boldface type apply over the full operating junction

temperature range (-30˚C ≤ T_J≤ +85˚C) . Unless otherwise specified: V_IN= 3.6V; V_Dxx= 3.6V; V(EN) = 2.0V; Group A and

Group B LEDs not ON simultaneously (ENA = V_INand ENB = GND, or ENA = GND and ENB = V_IN); R_SET= 8.35kΩ; C_IN, C₁,

C₂, and C_POUT= 1µF. (Note 8)

Symbol

Parameter

Condition

3.0V ≤ V_IN≤ 4.2V, and V_IN= 5.5V

2.5V ≤ V_Dxx≤ 3.8V;

Min

Typ

Max

Units

13.8

(-8%)

16.2

(+8%)

(%)

R_SET= 8.35kΩ

3.0V ≤ V_IN≤ 5.5V;

2.5V ≤ V_Dxx≤ 3.6V;

R_SET= 6.25kΩ

Output Current Regulation

3.0V ≤ V_IN≤ 5.5V;

2.5V ≤ V_Dxx≤ 3.9V;

R_SET= 12.5kΩ

I_Dxx

2.7V ≤ V_IN≤ 3.0V;

2.5V ≤ V_Dxx≤ 3.3V;

R_SET= 8.35kΩ

ENA and ENB ON (all 7 I_DXoutputs active),

V_IN= 3.0V, C_IN= C_OUT= 2.2µF

V_IN= 3.0V (Note 10)

I_Dxx-MATCHCurrent Matching Between Any

Two Group A Outputs or Group

B Outputs

I_Q

Quiescent Supply Current

2.7V ≤ V_IN≤ 4.2V;

3.5

No Load Current,

EN = ON, ENA = ENB = OFF

2.7V ≤ V_IN≤ 5.5V, EN = OFF

2.7V ≤ V_IN≤ 5.5V

I_SD

Shutdown Supply Current

I_SETPin Voltage

4.5

µA

V_SET

1.25

100

_Dxx/I_SETOutput Current to Current Set

Ratio

R_OUT

Charge Pump Output Resistance V_IN= 3.0V

(Note 11)

2.7

Ω

V_HR

Current Source Headroom

I_Dxx= 95% X I_Dxx(nom)

320

Voltage Requirement (Note 12)

R_SET= 8.35kΩ

(I_Dxx(nom) ≈ 15mA)

I_Dxx= 95%X I_Dxx(nom)

R_SET= 12.5kΩ

220

(I_Dxx(nom) ≈ 10mA)

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Electrical Characteristics (Notes 2, 7) (Continued)

Limits in standard typeface and typical values apply for T_J= 25^oC. Limits in boldface type apply over the full operating junction

temperature range (-30˚C ≤ T_J≤ +85˚C) . Unless otherwise specified: V_IN= 3.6V; V_Dxx= 3.6V; V(EN) = 2.0V; Group A and

Group B LEDs not ON simultaneously (ENA = V_INand ENB = GND, or ENA = GND and ENB = V_IN); R_SET= 8.35kΩ; C_IN, C₁,

C₂, and C_POUT= 1µF. (Note 8)

Symbol

f_SW

Parameter

Switching Frequency

Condition

Min

325

Typ

500

100

4.75

Max

675

Units

kHz

µs

3.0V ≤ V_IN≤ 4.2V

t_START

Start-up Time

I_Dx= 90% steady state

1.5x to 1x Threshold

1.5x/1x

Charge pump gain cross-over:

Gain = 1.5 when V_INis below

threshold. Gain = 1 when V_INis

above threshold.

1x to 1.5x Threshold

4.55

Logic Pin Specifications: EN, ENA, ENB

V_IL

Input Logic Low

2.7V ≤ V_IN≤ 5.5V

V_ENx= 0V

0.5

V_IN

V_IH

Input Logic High

1.1

I_LEAK

Input Leakage Current

0.1

µA

V_ENx= 3V (Note 13)

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the component may occur. Operating Ratings are conditions under which operation of

the device is guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions, see the

Electrical Characteristics tables.

Note 2: All voltages are with respect to the potential at the GND pin.

Note 3: Internal thermal shutdown circuitry protects the device from permanent damage. Thermal shutdown engages at T = 160˚C (typ.) and disengages at T

120˚C (typ.). The thermal shutdown function is guaranteed by design.

Note 4: The Human body model is a 100pF capacitor discharged through a 1.5k resistor into each pin. The machine model is a 200pF capacitor discharged directly

into each pin. MIL-STD-883 3015.7

Note 5: In applications where high power dissipation and/or poor package thermal resistance is present, the maximum ambient temperature may have to be

derated. Maximum ambient temperature (T

) is dependent on the maximum operating junction temperature (T

= 125˚C), the maximum power

A-MAX

J-MAX-OP

dissipation of the device in the application (P

), and the junction-to ambient thermal resistance of the part/package in the application (θ ), as given by the

D-MAX

following equation: T

= T

– (θ x P

A-MAX

J-MAX-OP

D-MAX

Note 6: Junction-to-ambient thermal resistance is highly dependent on application and board layout. In applications where high maximum power dissipation exists,

special care must be paid to thermal dissipation issues in board design.

Note 7: Min and Max limits are guaranteed by design, test, or statistical analysis. Typical numbers are not guaranteed, but do represent the most likely norm.

Note 8:

C , C

, C , and C : Low-ESR Surface-Mount Ceramic Capacitors (MLCCs) used in setting electrical characteristics

OUT 1 2

Note 9: If both LED groups are to be ON simultaneously, the maximum V

voltage may need to be derated, depending on minimum input voltage conditions. Refer

Dxx

to the "MAXIMUM OUTPUT CURRENT, MAXIMUM LED VOLTAGE, MINIMUM INPUT VOLTAGE" section.

Note 10: For the two groups of outputs on a part (Group A and Group B), the following are determined: the maximum output current in the group (MAX), the

minimum output current in the group (MIN), and the average output current of the group (AVG). For each group, two matching numbers are calculated:

(MAX-AVG)/AVG and (AVG-MIN)/AVG. The largest number of the two (worst case) is considered the matching figure for the group. The matching figure for a given

part is considered to be the highest matching figure of the two groups. The typical specification provided is the most likely norm of the matching figure for all parts.

Note 11: Output resistance (R

) models all voltage losses in the charge pump. R

OUT

can be used to estimate the voltage at the charge pump output (P

OUT

= (1.5 x V ) – (R

x I ). In the equation, I

OUT

is the total output current: the sum of all active Dxx output currents and all current drawn from P

. The

OUT

Pout

OUT

equation applies when the charge pump is operating with a gain of 3/2 (V ≤ 4.75V typ.).

Note 12: Headroom voltage: V

= V

– V

. If headroom voltage requirement is not met, LED current regulation will be compromised.

Dxx

Pout

Note 13: There is a 300kΩ(typ.) pull-down resistor connected internally between each enable pin (EN, ENA, ENB) and GND.

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Typical Performance Characteristics Unless otherwise specified: V_IN= 3.6V; V_DXX= 3.6V; V(EN) =

2.0V; V(ENA) = 2.0V; V(ENB) = 0V; R_SET= 8.3 kΩ; C_IN, C₁, C₂, and C_POUT= 1 µF.

LED Current vs. Input Voltage

LED Current vs. R_SETResistance

20093803

20093804

LED Current vs. PWM Duty Cycle,

PWM Applied to ENA and/or ENB

Charge Pump Output Resistance

vs. Ambient Temperature

20093806

20093805

www.national.com

ENA and ENB are used to turn the output currents ON and

OFF. ENA activates/deactivates the four group-A outputs

(D1A-D4A). ENB activates/deactivates the three group-B

outputs (D1B-D3B).

Circuit Description

OVERVIEW

The LM2796 is primarily intended for Lithium-Ion battery

driven white-LED drive applications, and is well suited to

drive white LEDs that are used for backlighting small-format

displays. The part has seven matched constant-current out-

puts, each capable of driving up to 20mA (or more) through

white LEDs. The well-matched current sources ensure the

current through all the LEDs is virtually identical. This keeps

brightness of all LEDs matched to near perfection so that

they can provide a consistent backlight over the entire dis-

play.

SETTING LED CURRENTS

The output currents of the LM2796 can be set to a desired

value simply by connecting an appropriately sized resistor

(R_SET) between the I_SETpin of the LM2796 and GND. The

output currents (LED currents) are proportional to the current

that flows out of the I_SETpin. The output currents are a factor

of 100 greater than the I_SETcurrent. The feedback loop of an

internal amplifier sets the voltage of the I_SETpin to 1.25V

(typ.). Placing a resistor between I_SETand GND programs

the I_SETcurrent, and thus the LED currents. The statements

above are simplified in the equations below:

The core of the LM2796 is a 1.5x/1x dual-mode charge

pump. The input of the charge pump is connected to the V_IN

pin. The recommended input voltage range of the LM2796 is

2.7V to 5.5V. The output of the charge pump is the P_OUTpin

( “Pump OUTput”). The output voltage of the charge pump is

unregulated and varies with input voltage and load current.

I_Dxx= 100 x(V_SET/ R_SET

)

R_SET= 100 x (1.25V / I_Dxx

)

Maximum Output Current, Maximum LED Voltage,

Minimum Input Voltage

The charge pump operates in the 1.5x mode when the input

voltage is below 4.75V (typ.). In this mode, the input-to-

output voltage gain of the charge pump is 1.5, and the

voltage at the output of the charge pump will be approxi-

mately 1.5x the input voltage (V(P_OUT) ≈ 1.5 * V_IN). When in

the 1.5x mode, the charge pump provides the voltage boost

that is required to drive white LEDs from a Li-Ion battery.

(White LEDs typically have a forward voltage in the range of

3.3V to 4.0V. A Li-Ion battery typically is not considered to be

fully discharged until the battery voltage falls to 3.0V (ap-

prox.) )

The LM2796 can drive 7 LEDs at 15mA each from an input

voltage as low as 3.0V, so long as the LEDs have a forward

voltage of 3.6V or less (room temperature).

The statement above is a simple example of the LED drive

capabilities of the LM2796. The statement contains the key

application parameters that are required to validate an LED-

drive design using the LM2796: LED current (I_LED), number

of active LEDs (N), LED forward voltage (V_LED), and mini-

mum input voltage (V_IN-MIN).

The equation below can be used to estimate the total output

current capability of the LM2796:

The charge pump operates in the 1x mode when the input

voltage is above 4.75V (typ.). In these conditions, voltage

boost is not required to drive the LEDs, so the charge pump

merely passes the input voltage to P_OUT(V(P_OUT) ≈ V_IN).

This reduces the input current and the power dissipation of

the LM2796 when the input voltage is high.

I_{LED_MAX}= ((1.5 x V_IN) - V_LED) / ((N x R_OUT) + k_HR) (eq. 1)

I_{LED_MAX}= ((1.5 x V_IN) - V_LED) / ((N x 2.7Ω) + 22mV/mA)

R_OUT– Output resistance. This parameter models the inter-

nal losses of the charge pump that result in voltage droop at

the pump output P_OUT. Since the magnitude of the voltage

droop is proportional to the total output current of the charge

pump, the loss parameter is modeled as a resistance. The

output resistance of the LM2796 is typically 2.7Ω (V_IN= 3.0V,

T_A= 25˚C). In equation form:

The matched current outputs are generated with a precision

current mirror that is biased off the charge pump output.

Matched currents are ensured with the use of tightly

matched internal devices and internal mismatch cancellation

circuitry. Top-side current drive allows LEDs to be connected

between each current output and GND, simplifying PWB

routing and connectivity.

V_POUT= 1.5xV_IN– NxI_LEDxR_OUT

(eq. 2)

k_HR– Headroom constant. This parameter models the mini-

mum voltage required to be present across the current

sources for them to regulate properly. This minimum voltage

is proportional to the programmed LED current, so the con-

stant has units of mV/mA. The typical k_HRof the LM2796 is

22mV/mA. In equation form:

There are seven regulated current outputs. These seven

outputs are split into two groups, a group of 4 outputs and a

group of 3 outputs. There is an ON/OFF control pin for each

group.

The DC current through the LEDs is programmed with an

external resistor. Changing currents on-the-fly can be

achieved with the use of digital pulse (PWM) signals.

(V_POUT– V_LED

)

k_HRxI_LED

(eq. 3)

The "I_LED-MAX" equation (eq. 1) is obtained from combining

the R_OUTequation (eq. 2) with the k_HRequation (eq. 3) and

solving for I_LED. Maximum LED current is highly dependent

on minimum input voltage and LED forward voltage. Output

current capability can be increased by raising the minimum

input voltage of the application, or by selecting an LED with

a lower forward voltage. Excessive power dissipation may

also limit output current capability of an application.

ENABLE PINS: EN, ENA, ENB

The LM2796 has 3 enable pins. All three are active-high

logic (HIGH = ON). There are internal pull-down resistors

(300kΩ typ.) that are connected internally between each of

the enable pins and GND.

The EN pin is the master enable pin for the part. When

voltage on this pin is low ( 0.5V), the part is in shutdown

mode. All internal circuitry is OFF and the part consumes

very little supply current when the LM2796 is shutdown.

Soft Start

The LM2796 contains internal soft-start circuitry to limit input

inrush currents when the part is enabled. Soft start is imple-

mented internally with a controlled turn-on of the internal

voltage reference. During soft start, the current through the

When the voltage on the EN pin is high ( 1.1V), the part is

active. The charge pump is ON, and it is possible to turn on

the output currents to drive the LEDs.

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In cases where a PWM signal must be connected to the EN

pin, measures can be taken to reduce the magnitude of the

charge-pump turn-on voltage spikes. More input capaci-

tance, series resistors and/or ferrite beads may provide ben-

efits.

Circuit Description (Continued)

LED outputs rise at the rate of the reference voltage ramp.

Due to the soft-start circuitry, turn-on time of the LM2796 is

approximately 100µs (typ.).

If the current and voltage spikes can be tolerated, connect-

ing the PWM signal to the EN pin does provide a benefit:

lower supply current when the PWM signal is active. When

the PWM signal is low, the LM2796 will be shutdown and

input current will only be a few micro-amps. This results in a

lower time-averaged input current than the prior suggestion,

where EN is kept on continuously.

Thermal Protection

Internal thermal protection circuitry disables the LM2796

when the junction temperature exceeds 160˚C (typ.). This

feature protects the device from being damaged by high die

temperatures that might otherwise result from excessive

power dissipation. The device will recover and operate nor-

mally when the junction temperature falls below 120˚C (typ.).

It is important that the board layout provides good thermal

conduction. This will help to keep the junction temperature

within specified operating ratings.

CAPACITOR SELECTION

The LM2796 requires 4 external capacitors for proper opera-

tion. Surface-mount multi-layer ceramic capacitors are rec-

ommended. These capacitors are small, inexpensive and

have very low equivalent series resistance (ESR 20mW

Applications Information

typ.). Tantalum capacitors, OS-CON capacitors, and alumi-

num electrolytic capacitors are not recommended for use

with the LM2796 due to their high ESR, as compared to

ceramic capacitors.

ADJUSTING LED BRIGHTNESS (PWM control)

Perceived LED brightness can be adjusted using a PWM

control signal to turn the LM2796 current sources ON and

OFF at a rate faster than perceptible by the eye. When this

is done, the total brightness perceived is proportional to the

duty cycle (D) of the PWM signal (D = the percentage of time

that the LED is on in every PWM cycle). A simple example: if

the LEDs are driven at 15mA each with a PWM signal that

has a 50% duty cycle, perceived LED brightness will be

about half as bright as compared to when the LEDs are

driven continuously with 15mA. A PWM signal thus provides

brightness (dimming) control for the solution.

For most applications, ceramic capacitors with X7R or X5R

temperature characteristic are preferred for use with the

LM2796. These capacitors have tight capacitance tolerance

(as good as 10%) and hold their value over temperature

(X7R: 15% over -55˚C to 125˚C; X5R: 15% over -55˚C to

85˚C).

Capacitors with Y5V or Z5U temperature characteristic are

generally not recommended for use with the LM2796. Ca-

pacitors with these temperature characteristics typically

have wide capacitance tolerance (+80%, -20%) and vary

significantly over temperature (Y5V: +22%, -82% over -30˚C

to +85˚C range; Z5U: +22%, -56% over +10˚C to +85˚C

range). Under some conditions, a nominal 1µF Y5V or Z5U

capacitor could have a capacitance of only 0.1µF. Such

detrimental deviation is likely to cause Y5V and Z5U capaci-

tors to fail to meet the minimum capacitance requirements of

the LM2796.

The minimum recommended PWM frequency is 100Hz. Fre-

quencies below this may be visibly noticeable as flicker or

blinking. The maximum recommended PWM frequency is

1kHz. Frequencies above this may cause interference with

internal current driver circuitry.

The preferred method for applying a PWM signal to adjust

brightness is to keep the master EN voltage ON continuously

and to apply the PWM signal(s) to the current source enable

pin(s): ENA and/or ENB. The benefit of this type of connec-

tion can be best understood with a contrary example. When

a PWM signal is connected to the master enable (EN) pin,

the charge pump repeatedly turns on and off. Every time the

charge pump turns on, there is an inrush of current as

capacitances, both internal and external, are recharged. This

inrush current results in a current and voltage spike at the

input of the part. By only applying the PWM signal to ENA/

ENB, the charge pump stays on continuously and much

lower input noise results.

The minimum recommended voltage rating for these capaci-

tors is 10V.

MICRO SMD MOUNTING

The LM2796 is an 18-bump micro SMD with a bump size of

approximately 300 micron diameter. The micro SMD pack-

age requires specific mounting techniques detailed in Na-

tional Semiconductor Application Note 1112 (AN-1112).

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Physical Dimensions inches (millimeters) unless otherwise noted

TLA18EHA: 18-Bump Thin Micro SMD, Large Bump

X1 = 2.098 0.030mm

X2 = 2.403mm 0.030

X3 = 0.600mm 0.075mm

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DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL

COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:

1. Life support devices or systems are devices or

systems which, (a) are intended for surgical implant

into the body, or (b) support or sustain life, and

whose failure to perform when properly used in

accordance with instructions for use provided in the

labeling, can be reasonably expected to result in a

significant injury to the user.

2. A critical component is any component of a life

support device or system whose failure to perform

can be reasonably expected to cause the failure of

the life support device or system, or to affect its

safety or effectiveness.

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National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products

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National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.

LM2796TL [NSC]

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