MAX8596XETA [MAXIM]
High-Efficiency, 36V Step-Up Converters with TA Derating Option for 2 to 9 White LEDs; 高效率， 36V，升压型变换器，提供TA降额可驱动2至9个白光LED
| 型号： | MAX8596XETA |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | High-Efficiency, 36V Step-Up Converters with TA Derating Option for 2 to 9 White LEDs |
| 文件： | 总8页 (文件大小：230K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-3485; Rev 0; 11/04
High-Efficiency, 36V Step-Up Converters
with T Derating Option for 2 to 9 White LEDs
A
General Description
Features
The MAX8595X/MAX8596X drive up to nine white LEDs
with constant current and high efficiency to provide
LCD backlighting in cell phones, PDAs, and other
handheld devices. The series connection allows the
LED currents to be identical for uniform brightness and
minimizes the number of traces to the LEDs. The
MAX8595X regulates constant LED current over the
entire temperature range. The MAX8596X features an
ambient-temperature derating function to avoid over-
driving the white LEDs during high ambient tempera-
tures, enabling higher drive current below +42°C.
♦ Up to Nine LEDs at 25mA
♦ Temperature Derating Function to Allow Fewer
LEDs for Same Light (MAX8596X)
♦ 86% Efficiency (P
/ P )
IN
LEDs
♦ 1.7% Current-Regulation Accuracy
♦ Output Overvoltage Protection
♦ Flexible Dimming Control
Analog
Direct-PWM Internal Filter
A single Dual Mode™ input provides a simple means of
brightness adjustment and on/off control. Fast 1MHz
current-mode PWM operation allows for small input and
output capacitors and a small inductor while minimizing
ripple on the input supply/battery. Soft-start eliminates
inrush current during startup.
♦ 1MHz PWM Switching Frequency
♦ 0.1µF Output Capacitor
♦ 12mV
Low Input Ripple
P-P
♦ Soft-Start Eliminates Inrush Current
♦ 2.6V to 5.5V Input Range
The MAX8595X/MAX8596X are available in a space-
saving, 8-pin, 3mm x 3mm TDFN package.
♦ 0.3µA Shutdown Current
Applications
♦ Pin Compatible with the MAX1561 and MAX1599
Cell Phones and Smart Phones
PDAs, Palmtops, and Wireless Handhelds
e-Books and Subnotebooks
♦ TDFN 3mm x 3mm x 0.8mm Package with
Exposed Paddle
White LED Display Backlighting
Ordering Information
PKG
PART
TEMP RANGE PIN-PACKAGE
CODE
T833-1
T833-1
8 TDFN 3mm x 3mm
8 TDFN 3mm x 3mm
MAX8595XETA -40°C to +85°C
MAX8596XETA* -40°C to +85°C
Dual Mode is a trademark of Maxim Integrated Products, Inc.
*Future product—contact factory for availability.
Pin Configuration
Typical Operating Circuit
OUTPUT
UP TO 38V
INPUT
2.6V TO 5.5V
TOP VIEW
2.2µF
8
7
6
5
IN
LX
OUT
ANALOG OR
MAX8595X
MAX8596X
PWM DIMMING
MAX8595X
MAX8596X
0.1µF
CTRL
PGND
CS
200Hz TO 200kHz
2
3
1
4
COMP
GND
TDFN
3mm x 3mm x 0.8mm
2 TO 9 LEDs
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
High-Efficiency, 36V Step-Up Converters
with T Derating Option for 2 to 9 White LEDs
A
ABSOLUTE MAXIMUM RATINGS
IN to GND.................................................................-0.3V to +6V
PGND to GND .......................................................-0.3V to +0.3V
LX, OUT to GND.....................................................-0.3V to +40V
CTRL to GND...................-0.3V to the lower of +6V or (V + 2V)
COMP, CS to GND ......................................-0.3V to (V + 0.3V)
Continuous Power Dissipation (T = +70°C)
A
8-Pin TDFN 3mm x 3mm
(derate 24.4mW/°C above +70°C)............................ 1950mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
IN
IN
I
LX
...................................................................................1.0A
RMS
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V = 3.0V, L = 22µH, C = 2.2µF, C
= 0.1µF, C
= 0.1µF, R
= 13Ω, V
= 1.5V, T = -40°C to +85°C, unless other-
CTRL A
IN
IN
OUT
COMP
SENSE
wise noted. Typical values are at T = +25°C.) (Note 1)
A
PARAMETER
CONDITIONS
MIN
2.6
TYP
MAX
5.5
UNITS
V
Supply Voltage
UVLO Threshold
UVLO Hysteresis
Quiescent Current
V
rising or falling
2.10
2.38
30
2.55
V
IN
mV
mA
No switching
CTRL = GND,
V
0.5
0.3
1
0.7
2
T
T
= +25°C
= +85°C
A
Shutdown Supply Current
µA
= V
IN
OUT
A
OVLO Threshold
OVLO Hysteresis
V
rising
36
9
38
40
V
V
OUT
2
V
= 32V, V
> 0.24V
CTRL
20
35
1
OUT
OUT Input Bias Current
µA
V
T
T
= +25°C
= +85°C
0.01
0.1
A
OUT = IN, CTRL = GND
(Note 2)
A
V
-
IN
Output Voltage Range
36
V
D
ERROR AMPLIFIER
T
T
T
T
T
= +25°C
0.295
0.292
0.290
0.300
0.300
0.300
0.01
0.03
330
0.305
0.308
0.310
1
A
A
A
A
A
V
V
= 1.50V,
= 2.6V to 5.5V
CTRL
CTRL to CS Regulation
CS Input Bias Current
= 0°C to +85°C
= -40°C to +85°C
= +25°C
V
IN
V
= V
/ 5
CTRL
µA
CS
= +85°C
MAX8595X, V
= 3.0V
310
330
347
360
CTRL
T
A
T
A
T
A
= -40°C to +25°C
= +42°C
345
CS Maximum Brightness Clamp
Voltage
mV
MAX8596X,
V
343
= 3.0V
CTRL
= +85°C
106.5
1.65
1.72
MAX8595Z
MAX8596Z
CTRL Voltage for CS Maximum
Brightness Clamp
V
CS Derating Function Start
Temperature
MAX8596Z, V
= 3.0V
+42
°C
CTRL
2
_______________________________________________________________________________________
High-Efficiency, 36V Step-Up Converters
with T Derating Option for 2 to 9 White LEDs
A
ELECTRICAL CHARACTERISTICS (continued)
(V = 3.0V, L = 22µH, C = 2.2µF, C
= 0.1µF, C
= 0.1µF, R
= 13Ω, V
= 1.5V, T = -40°C to +85°C, unless other-
CTRL A
IN
IN
OUT
COMP
SENSE
wise noted. Typical values are at T = +25°C.) (Note 1)
A
PARAMETER
CONDITIONS
= 3.0V, T = +42°C to +85°C
MIN
TYP
-5.5
500
170
5
MAX
UNITS
mV/°C
kΩ
CS Derating Function Slope
CTRL Input Resistance
MAX8596X, V
CTRL
A
V
< 1.5V
250
100
780
240
CTRL
CTRL Dual-Mode Threshold
CTRL Dual-Mode Hysteresis
CTRL Shutdown Enable Delay
CS to COMP Transconductance
mV
mV
(Note 3)
= 1.5V
6.0
32
8.2
50
10.5
82
ms
V
µS
COMP
COMP Input Resistance to
Ground
In shutdown, UVLO or OVLO
20
kΩ
OSCILLATOR
Operating Frequency
0.75
94
1.0
12
0
1.25
MHz
%
PWM mode
Minimum Duty Cycle
Pulse skipping
Maximum Duty Cycle
n-CHANNEL SWITCH
LX On-Resistance
CTRL = IN, CS = GND
95
%
I
= 190mA
0.8
0.01
1
1.35
5
Ω
LX
T
T
= +25°C
= +85°C
A
LX Leakage Current
LX Current Limit
V
= 36V, CTRL = GND
µA
mA
LX
A
Duty cycle = 90%
500
700
900
Note 1: Parameters are 100% production tested at T = +25°C. Limits over the operating temperature range are regulated by
A
design and characterization.
Note 2: V is the forward-voltage drop of the Schottky diode in Figure 1.
D
Note 3: Time from CTRL going below the Dual-Mode threshold to IC shutdown.
_______________________________________________________________________________________
3
High-Efficiency, 36V Step-Up Converters
with T Derating Option for 2 to 9 White LEDs
A
Typical Operating Characteristics
(Circuit of Figure 1, V = 3.6V, I
IN
unless otherwise noted.)
= 25mA, L = 22µH, C = 2.2µF, C
= 0.1µF, C
= 0.1µF, R
= 13Ω, 4 LEDs, T = +25°C,
LED
IN
OUT
COMP
SENSE A
EFFICIENCY
vs. INPUT VOLTAGE
EFFICIENCY
vs. LED CURRENT
100
95
90
85
80
75
70
65
60
55
50
90
85
80
75
70
65
6 LEDs
3 LEDs
3 LEDs
8 LEDs
4 LEDs
6 LEDs
8 LEDs
60
0
2
3
4
5
6
5
10
15
20
25
30
INPUT VOLTAGE (V)
LED CURRENT (mA)
LED CURRENT
LED CURRENT
vs. DIRECT-PWM DIMMING
vs. AMBIENT TEMPERATURE
30
25
20
15
10
5
26
24
22
20
18
16
14
12
10
8
MAX8596,
I
= 25mA AT T = +25°C
LED
A
MAX8595,
I
= 15mA
LED
0
0
20
40
60
80
100
-40 -20
0
20
40
60
80 100
DUTY CYCLE (%)
TEMPERATURE (°C)
SWITCHING WAVEFORMS
SOFT-START AND SHUTDOWN RESPONSE
MAX8595X toc05
MAX8595X toc06
V
20mV/div
IN
AC-COUPLED
V
CTRL
2V/div
0
V
LX
10V/div
I
IN
100mA/div
0
200mV/div
V
OUT
AC-COUPLED
I
LED
40mA/div
0
I
100mA/div
L
V
10V/div
OUT
0
500ns/div
20ms/div
4
_______________________________________________________________________________________
High-Efficiency, 36V Step-Up Converters
with T Derating Option for 2 to 9 White LEDs
A
Typical Operating Characteristics (continued)
(Circuit of Figure 1, V = 3.6V, I
IN
unless otherwise noted.)
= 25mA, L = 22µH, C = 2.2µF, C
= 0.1µF, C
= 0.1µF, R
= 13Ω, 4 LEDs, T = +25°C,
LED
IN
OUT
COMP
SENSE A
DIRECT-PWM DIMMING RESPONSE
CTRL STEP RESPONSE
MAX8595X toc08
MAX8595X toc07
2V/div
32kHz 50%
DUTY CYCLE
V
CTRL
V
CTRL
1V/div
0
0
20mV/div
AC-COUPLED
V
IN
I
100mA/div
IN
0
0
500mV/div
AC-COUPLED
V
OUT
I
LED
40mA/div
0
0
I
LED
V
10mA/div
10V/div
OUT
0
0
10µs/div
20ms/div
Pin Description
PIN
NAME
FUNCTION
Overvoltage Sense. When V
is greater than 38V (typ), the internal n-channel MOSFET turns off
OUT
1
OUT
until V
drops below 36V (typ), then the IC reenters soft-start. Connect a 0.1µF ceramic capacitor
OUT
from OUT to ground. In shutdown, V
is one diode drop below V .
IN
OUT
Input Voltage Supply. The input voltage range is 2.6V to 5.5V. Connect a 2.2µF ceramic capacitor
from IN to GND.
2
3
IN
Brightness Control Input. The voltage applied to CTRL controls LED brightness. Varying the voltage
from 0.24V to 1.65V (1.72V for the MAX8596X) adjusts the brightness from dim to 100% brightness,
respectively. Any voltage above 1.65V (1.72V) does not increase brightness. Hold CTRL below
100mV to shut down the IC after an 8.2ms delay.
CTRL
Current-Sense Feedback Input. Connect a resistor from CS to GND to set the LED bias current. The
4
5
CS
voltage at CS regulates to V
/ 5 or 0.330V (0.343V for the MAX8596X), whichever is lower.
CTRL
Compensation Input. Connect a 0.1µF ceramic capacitor (C
) from COMP to GND. C
COMP COMP
stabilizes the converter, controls soft-start, and lowpass filters direct PWM dimming at CTRL. C
COMP
COMP
discharges to 0V through an internal 20kΩ resistor in shutdown.
6
7
GND
Ground. Connect to PGND and the exposed pad directly under the IC.
Power Ground. Connect to GND and the exposed pad directly under the IC.
PGND
Inductor Connection. Connect LX to the node between the inductor and the Schottky diode. LX is
high impedance in shutdown.
8
LX
EP
Exposed Pad. Connect to a large ground plane for maximum package heat dissipation. Connect
directly to GND and PGND under the IC.
—
_______________________________________________________________________________________
5
High-Efficiency, 36V Step-Up Converters
with T Derating Option for 2 to 9 White LEDs
A
Detailed Description
The high efficiency and small size of the MAX8595X/
2.6V TO 5.5V
MAX8596X make them ideally suited to drive up to nine
2.2µF
series-connected LEDs. These devices operate as a
22µH
boost DC-DC converter that regulates output current
rather than voltage. The MAX8595X/MAX8596X provide
IN
LX
even illumination by sourcing the same output current
through each LED, eliminating the need for expensive
factory calibration. The fast 1MHz internal oscillator
allows for a small inductor and small input and output
capacitors while minimizing input and output ripple.
PWM
CONTROL
PGND
OUT
f
OSC
1MHz
The single analog control input (CTRL) allows easy
adjustment of LED brightness and on/off control. This
allows simple logic-level on/off control, analog voltage
control, or PWM duty-cycle control of both brightness
and shutdown. In shutdown, supply current is reduced
to a low 0.3µA (typ). A soft-start gradually illuminates
the LEDs, eliminating the inrush current during startup.
OVER-
VOLTAGE
PROTECT
0.1µF
0.1µF
COMP
1.25V CLAMP OR
TEMP DERATE CLAMP
g
m
CTRL
The MAX8596X has the additional feature of derating
LED current as ambient temperature rises. Above
+42°C, the CS regulation voltage is reduced at a rate of
5.5mV/°C, thus reducing the LED current.
ANALOG
OR DIRECT
PWM
279kΩ
121kΩ
100kΩ
CS
DIMMING
R
SENSE
13Ω
Soft-Start
8.2ms
SHUTDOWN
The MAX8595X/MAX8596X attain soft-start by charging
COMP
170mV
C
gradually with a current source. When V
COMP
rises above 1.25V, the internal MOSFET begins switch-
ing at a reduced duty cycle. When V rises above
GND
COMP
2.25V, the duty cycle is at its maximum. See the
Typical Operating Characteristics for an example of
soft-start operation.
Figure 1. Functional Diagram and Typical Application Circuit
Shutdown
nal MOSFET from switching and causes V
to
COMP
The MAX8595X/MAX8596X enter shutdown when V
CTRL
decay towards 0V. The device comes out of OVLO and
into soft-start when V falls below 36V (typ).
is less than 100mV for more than 8.2ms. In shutdown,
supply current is reduced to 0.3µA (typ) by powering
down the entire IC except for the CTRL voltage-detec-
OUT
Ambient Temperature Derating Function
(MAX8596X)
The MAX8596X limits the maximum LED current
tion circuitry. C
is discharged during shutdown,
COMP
allowing the device to reinitiate soft-start when it is
enabled. Although the internal n-channel MOSFET does
not switch in shutdown, there is still a DC current path
between the input and the LEDs through the inductor
and Schottky diode. The minimum forward voltage of the
LED array must exceed the maximum input voltage to
ensure that the LEDs remain off in shutdown. However,
with two or more LEDs, the forward voltage is large
enough to keep leakage current low, less than 1µA
(typ). Typical shutdown timing characteristics are shown
in the Typical Operating Characteristics.
depending on the die temperature. V
is limited to
CS
343mV up to +42°C. Once the temperature reaches
+42°C, the maximum V
declines by 5.5mV/°C until
CS
the minimum 106.5mV threshold is reached at +85°C.
Due to the package’s exposed paddle, the die temper-
ature is always very close to the PC board temperature.
The temperature derating function allows the LED cur-
rent to be safely set higher at normal operating temper-
atures, thereby allowing either a brighter display or
fewer LEDs to be used for normal display brightness.
See the Typical Operating Characteristics for LED
Current vs. Ambient Temperature.
Overvoltage Protection
Overvoltage lockout (OVLO) occurs when V
is
OUT
above 38V (typ). The protection circuitry stops the inter-
6
_______________________________________________________________________________________
High-Efficiency, 36V Step-Up Converters
with T Derating Option for 2 to 9 White LEDs
A
more efficient. To prevent core saturation, ensure that
the inductor-saturation current rating exceeds the peak
Design Procedure
Adjusting LED Current
Adjusting the output current of the MAX8595X/
MAX8596X changes the brightness of the LEDs. An
analog input (CTRL) and the sense-resistor value set
the output current. Output current is given by:
inductor current for the application. Calculate the peak
inductor current with the following formula:
V
×I
V
× 0.9µs
OUT(MAX) LED(MAX)
IN(MIN)
I
=
+
PEAK
0.9× V
2×L
IN(MIN)
I
= V
/ (5 x R
)
LED
CTRL
SENSE
The V
voltage range for adjusting output current is
CTRL
Schottky Diode Selection
0.24V to 1.65V (or 1.72V for the MAX8596X). To set the
The high switching frequency of the MAX8595X/
MAX8596X demands a high-speed rectification diode
(D1) for optimum efficiency. A Schottky diode is recom-
mended due to its fast recovery time and low forward-
voltage drop. Ensure that the diode’s average and
peak current rating exceed the average output current
and peak inductor current. In addition, the diode’s
maximum current, calculate R
its maximum as follows:
when V
is at
CTRL
SENSE
For the MAX8595X, R
For the MAX8596X, R
= 1.65 / (5 x I
= 1.72 / (5 x I
)
)
SENSE
SENSE
LED(MAX)
LED(MAX)
Power dissipation in R
allowing the use of a small surface-mount resistor.
is typically less than 10mW,
SENSE
reverse breakdown voltage must exceed V
. The
OUT
RMS diode current can be approximated from:
PWM Dimming Control
CTRL is also used as a digital input allowing LED
brightness control with a logic-level PWM signal
applied directly to CTRL. The frequency range is from
200Hz to 200kHz, while 0% duty cycle corresponds to
zero current and 100% duty cycle corresponds to full
current. The error amplifier and compensation capaci-
tor form a lowpass filter so PWM dimming results in DC
current to the LEDs without the need for any additional
RC filters; see the Typical Operating Characteristics.
I
= I ×I
DIODE(RMS)
OUT PEAK
Applications Information
PC Board Layout
Due to fast switching waveforms and high-current
paths, careful PC board layout is required. An evalua-
tion kit (MAX8596XEVKIT) is available to speed design.
When laying out a board, minimize trace lengths
between the IC and R
Capacitor Selection
Ceramic capacitors with X5R, X7R, or better dielectric
are recommended for stable operation over the entire
operating temperature range. The exact values of input
and output capacitors are not critical. The typical value
for the input capacitor is 2.2µF, and the typical value for
the output capacitor is 0.1µF. Higher value capacitors
can be used to reduce input and output ripple, but at
, the inductor, the diode,
SENSE
the input capacitor, and the output capacitor. Keep
traces short, direct, and wide. Keep noisy traces, such
as the LX node trace, away from CS. The IN bypass
capacitor (C ) should be placed as close to the IC as
IN
possible. PGND and GND should be connected direct-
ly to the exposed paddle underneath the IC. The
ground connections of C and C
should be as
OUT
IN
the expense of size and higher cost. C
stabilizes
COMP
close together as possible. The traces from IN to the
inductor and from the Schottky diode to the LEDs can
be longer.
the converter and controls soft-start. Connect a 0.1µF
capacitor from COMP to GND. For stable operation,
C
OUT
must not exceed 10 times C
.
COMP
Chip Information
TRANSISTOR COUNT: 2143
Inductor Selection
Inductor values range from 10µH to 47µH. A 22µH
inductor optimizes the efficiency for most applications
PROCESS: BiCMOS
while maintaining low 12mV
input ripple. With input
P-P
voltages near 5V, a larger value of inductance can be
_______________________________________________________________________________________
7
High-Efficiency, 36V Step-Up Converters
with T Derating Option for 2 to 9 White LEDs
A
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
D
N
PIN 1
INDEX
AREA
E
E2
DETAIL A
C
C
L
L
L
L
A
e
e
PACKAGE OUTLINE, 6, 8, 10 & 14L,
TDFN, EXPOSED PAD, 3x3x0.80 mm
1
NUMBER OF LEADS SHOWN ARE FOR REFERENCE ONLY
21-0137
F
2
COMMON DIMENSIONS
SYMBOL
MIN.
0.70
2.90
2.90
0.00
0.20
MAX.
0.80
3.10
3.10
0.05
0.40
A
D
E
A1
L
k
0.25 MIN.
0.20 REF.
A2
PACKAGE VARIATIONS
PKG. CODE
T633-1
N
6
D2
E2
e
JEDEC SPEC
b
[(N/2)-1] x e
1.50 0.10 2.30 0.10 0.95 BSC
1.50 0.10 2.30 0.10 0.65 BSC
MO229 / WEEA
MO229 / WEEC
0.40 0.05
0.30 0.05
1.90 REF
1.95 REF
2.00 REF
2.40 REF
2.40 REF
T833-1
8
T1033-1
T1433-1
T1433-2
10
14
14
1.50 0.10 2.30 0.10 0.50 BSC MO229 / WEED-3 0.25 0.05
1.70 0.10 2.30 0.10 0.40 BSC
1.70 0.10 2.30 0.10 0.40 BSC
- - - -
- - - -
0.20 0.03
0.20 0.03
PACKAGE OUTLINE, 6, 8, 10 & 14L,
TDFN, EXPOSED PAD, 3x3x0.80 mm
2
21-0137
F
2
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2004 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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SI9137DB
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