MAX8630ZETD25+ [ROCHESTER]
SWITCHED CAPACITOR REGULATOR, 1000kHz SWITCHING FREQ-MAX, PDSO14, 3 X 3 MM, 0.80 MM HEIGHT, TDFN-14;
| 型号： | MAX8630ZETD25+ |
| 厂家： | 
Rochester Electronics |
| 描述： | SWITCHED CAPACITOR REGULATOR, 1000kHz SWITCHING FREQ-MAX, PDSO14, 3 X 3 MM, 0.80 MM HEIGHT, TDFN-14 开关 光电二极管 |
| 文件： | 总13页 (文件大小：1388K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-3689; Rev 0; 5/05
125mA 1x/1.5x Charge Pumps for 5 White LEDs
in 3mm x 3mm TDFN
General Description
Features
The MAX8630Y/MAX8630Z charge pumps drive up to 5
white LEDs with regulated constant current up to 125mA
total. By utilizing adaptive 1x/1.5x charge-pump modes
and very low-dropout current regulators, they achieve
high efficiency over the full 1-cell Li+ battery input volt-
age range. The 1MHz fixed-frequency switching allows
for tiny external components, and the regulation scheme
is optimized to ensure low EMI and low input ripple. An
integrated derating function protects the LEDs from
overheating during high ambient temperatures.
♦ 93% Max/85% Avg. Efficiency (P
/P
) Over
LED BATT
Li+ Battery Discharge
♦ 1% LED Current Accuracy
♦ 125mA Total Drive Capability
♦ Adaptive 1x/1.5x Mode Switchover
♦ Single-Wire, Serial-Pulse Dimming (MAX8630Z)
Independent On/Off/Dimming for Main and Sub
Linear—Full, 31/32nd, 30/32nd, … 1/32nd
The MAX8630Y/MAX8630Z are factory trimmed for full-
scale LED current options of 15mA, 18mA, 20mA, and
25mA. The MAX8630Z uses two enable inputs (ENM for
3 main LEDs and ENS for 2 sub LEDs) for simple on/off
control and single-wire, serial-pulse dimming in 32 linear
steps. The MAX8630Y uses a single direct PWM input
(PWM) to control all 5 LEDs with DC current proportional
to the PWM duty cycle. If both ENM and ENS (or PWM)
are kept low for more than 2ms, the MAX8630_ enters
shutdown. The MAX8630Y/MAX8630Z are available in a
14-pin, 3mm x 3mm TDFN package (0.8mm max
height).
♦ Direct-PWM Dimming (MAX8630Y)
♦ 15, 18, 20, and 25mA Full-Scale Versions
♦ Low 0.1µA Shutdown Current
♦ Soft-Start Eliminates Inrush Current
♦ Output Overvoltage Protection
♦ Thermal-Derating Function Protects LEDs
♦ 14-Pin, 3mm x 3mm TDFN Package
Ordering Information
Applications
PIN-
PACKAGE
TOP
MARK
PART
TEMP RANGE
Display Backlight (Up to 5 LEDs)
Main (3 LEDs) + Sub (2 LEDs) Displays
Cell Phones and Smartphones
14 TDFN
MAX8630YETD15 -40°C to +85°C 3mm x 3mm
AAS
(T1433-2)
PDAs, Digital Cameras, and Camcorders
Ordering Information continued at end of data sheet.
Pin Configuration
Selector Guide appears at end of data sheet.
Typical Operating Circuit
TOP VIEW
1µF
INPUT
2.7V TO 5.5V
14 13 12 11 10
9
8
C1P
C1N
OUTPUT
OUT
IN
1µF
1µF
GND
MAX8630Z
MAIN
SUB
LED1
LED2
LED3
LED4
LED5
MAX8630Y
MAX8630Z
ENABLE MAIN
ENM
ENS
ON/OFF AND
DIMMING
ENABLE SUB
ON/OFF AND
DIMMING
1
2
3
4
5
6
7
C2P C2N
TDFN
3mm × 3mm
( ) ARE FOR MAX8630Y
1µF
________________________________________________________________ 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.
125mA 1x/1.5x Charge Pumps for 5 White LEDs
in 3mm x 3mm TDFN
ABSOLUTE MAXIMUM RATINGS
IN, OUT to GND.....................................................-0.3V to +6.0V
C1N, C2N, ENM, CPWM, ENS,
Continuous Power Dissipation (T = +70°C)
A
14-Pin TDFN 3mm x 3mm
PWM to GND ............................................-0.3V to (V + 0.3V)
(derate 18.2mW/°C above +70°C).............................1454mW
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
IN
LED_ to GND............................................-0.3V to (V
+ 0.3V)
OUT
C1P, C2P to GND ...-0.3V to greater of (V
+ 1V) or (V + 1V)
OUT
IN
OUT Short Circuit to GND ..........................................Continuous
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 = 3.6V, V
= 0V, EN_ (PWM) = IN, T = -40°C to +85°C, unless otherwise noted. Typical values are at T = +25°C.) (Note 1)
IN
GND
A
A
PARAMETER
CONDITIONS
MIN
2.7
TYP
MAX
5.5
UNITS
IN Operating Voltage
V
V
Undervoltage-Lockout Threshold
Undervoltage-Lockout Hysteresis
V
V
rising or falling
2.20
2.45
100
2.65
IN
mV
Output Overvoltage Protection
Threshold
rising, any LED_ = GND
5
V
OUT
1/32nd setting, 1.5x mode
1/32nd setting, 1x mode
1.4
0.35
0.01
0.1
2
No-Load Supply Current
Shutdown Supply Current
mA
T
T
= +25°C
= +85°C
2
A
A
ENM = ENS (PWM) = GND
µA
ms
Soft-Start Time (t
)
SOFT-START
MAX8630_ETD15
MAX8630_ETD18
MAX8630_ETD20
MAX8630_ETD25
15
18
Full-Scale LED Current
mA
20
25
T
T
= +25°C
-1
0.3
0.3
+1
A
A
Full-Scale LED Current Accuracy
%
= -40°C to derating function start temperature
-3.5
+3.5
Derating Function Start
Temperature
40
°C
Derating Function Slope
LED_ Dropout Voltage
T
= +40°C to +85°C
-1.67
40
%/°C
mV
A
100% LED setting (Note 2)
75
1x to 1.5x Mode Transition
Threshold
V
falling
88
mV
LED_
Input Voltage Mode Transition
Hysteresis
70
122
5
mV
mV
kΩ
1.5x Mode Regulation Voltage
Minimum of V
LED_
OUT Pulldown Resistance in
Shutdown
ENM = ENS (PWM) = GND
2
_______________________________________________________________________________________
125mA 1x/1.5x Charge Pumps for 5 White LEDs
in 3mm x 3mm TDFN
ELECTRICAL CHARACTERISTICS (continued)
(V = 3.6V, V
= 0V, EN_ (PWM) = IN, T = -40°C to +85°C, unless otherwise noted. Typical values are at T = +25°C.) (Note 1)
A A
IN
GND
PARAMETER
CONDITIONS
) / I
MIN
TYP
MAX
1.5
UNITS
1x mode, (V - V
0.8
3.2
IN
OUT
OUT
Open-Loop OUT Resistance
Ω
1.5x mode, (1.5V - V ) / I
OUT OUT
7.2
IN
Maximum OUT Current
OUT Short-Circuit Current Limit
Switching Frequency
V
V
≥ 3.2V, V
= 3.9V
OUT
125
mA
mA
IN
< 1.25V
57
1
OUT
MHz
Direct-PWM Dimming Filter
Corner Frequency (MAX8630Y)
C
= 0.1µF, (PWM frequency of 900Hz to 100kHz
CPWM
10
Hz
recommended)
EN_ (PWM) High Voltage
EN_ (PWM) Low Voltage
V
V
= 2.7V to 5.5V
= 2.7V to 5.5V
1.4
V
V
IN
IN
0.4
1
EN_ (PWM) Minimum Input
Slew Rate
V
V
= 2.7V to 5.5V (recommended minimum slew rate)
1
V/µs
µA
IN
T
T
= +25°C
= +85°C
0.01
0.1
A
A
EN_ (PWM) Input Current
= 0V or 5.5V
EN_ (PWM)
EN_ (PWM) Low Shutdown Delay
1
2
4
ms
(t
)
SHDN
EN_ t (See Figure 4)
0.5
0.5
50
500.0
µs
µs
µs
°C
°C
LO
EN_ t (See Figure 4)
HI
Initial EN_ t (See Figure 4)
HI
First EN_ (PWM) high pulse
Thermal Shutdown
+160
20
Thermal-Shutdown Hysteresis
Note 1: Limits are 100% production tested at T = +25°C. Limits over the operating temperature range are guaranteed by design.
A
Note 2: Dropout voltage is defined as the LED_ to GND voltage at which current into LED_ drops 10% from the value at V
= 0.2V.
LED_
Typical Operating Characteristics
(V = 3.6V, ENM = ENS = IN, T = +25°C, unless otherwise noted.)
IN
A
INPUT CURRENT vs. INPUT VOLTAGE
DRIVING 5 LEDs
INPUT CURRENT vs. INPUT VOLTAGE
DRIVING 3 MAIN LEDs
EFFICIENCY vs. INPUT VOLTAGE
DRIVING 5 LEDs
100
160
140
120
100
80
160
140
120
100
80
V
IN
FALLING
V
IN
FALLING
90
80
70
60
50
40
30
20
10
0
I
= 20mA
LED
I
= 20mA
LED
I
= 8.125mA
LED
I
= 20mA
LED
I
= 1.875mA
LED
I
= 8.125mA
LED
60
60
I
= 8.125mA
LED
I
= 1.875mA
LED
40
40
I
= 1.875mA
LED
20
20
V
FALLING
3.9
IN
0
0
2.7
3.0
3.3
3.6
4.2
2.7
3.0
3.3
3.6
3.9
4.2
2.7
3.0
3.3
3.6
3.9
4.2
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
_______________________________________________________________________________________
3
125mA 1x/1.5x Charge Pumps for 5 White LEDs
in 3mm x 3mm TDFN
Typical Operating Characteristics (continued)
(V = 3.6V, ENM = ENS = IN, T = +25°C, unless otherwise noted.)
IN
A
INPUT RIPPLE VOLTAGE vs. SUPPLY
VOLTAGE DRIVING 5 WHITE LEDs
INPUT CURRENT vs. INPUT VOLTAGE
DRIVING 2 SUB LEDs
LED CURRENT MATCHING vs. INPUT
VOLTAGE (25mA/LED)
140
120
100
80
28
27
26
25
24
23
22
21
20
160
140
120
100
80
V
IN
FALLING
20mA/LED
15mA/LED
8mA/LED
I
= 20mA
LED
60
60
I
= 8.125mA
LED
40
2mA/LED
40
20
20
I
= 1.875mA
3.0
LED
0
0
2.7
3.2
3.7
4.2
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
INPUT VOLTAGE (V)
2.7
3.3
3.6
3.9
4.2
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
LED CURRENT MATCHING vs. INPUT
VOLTAGE (2.5mA/LED)
OUTPUT CURRENT vs. TEMPERATURE
(5 LEDs AT 25mA EACH)
2.80
2.70
2.60
2.50
2.40
2.30
2.20
2.10
2.00
140
120
100
80
TEMPERATURE
DERATING
60
40
20
0
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
INPUT VOLTAGE (V)
-40
-15
10
35
60
85
TEMPERATURE (°C)
1x MODE OPERATING WAVEFORMS
1.5x MODE OPERATING WAVEFORMS
(V = 4.0V)
IN
(V = 3.6V)
IN
MAX8630Y/Z toc09
MAX8630Y/Z toc10
200mV/div
(AC-COUPLED)
200mV/div
(AC-COUPLED)
V
OUT
V
OUT
200mV/div
(AC-COUPLED)
200mV/div
(AC-COUPLED)
V
IN
V
IN
I
100mA/div
IN
100mA/div
I
IN
1µs/div
1µs/div
4
_______________________________________________________________________________________
125mA 1x/1.5x Charge Pumps for 5 White LEDs
in 3mm x 3mm TDFN
Typical Operating Characteristics (continued)
(V = 3.6V, ENM = ENS = IN, T = +25°C, unless otherwise noted.)
IN
A
MAIN STARTUP AND SHUTDOWN
WITH SUB ENABLED
STARTUP AND SHUTDOWN
MAX8630Y/Z toc12
MAX8630Y/Z toc11
5V/div
2V/div
5V/div
2V/div
V
ENM
V
AND
ENM
V
ENS
V
OUT
V
0
OUT
0
100mA/div
0
100mA/div
I
IN
I
IN
0
100mA/div
0
I
OUT
100mA/div
0
I
OUT
1ms/div
1ms/div
LINE-TRANSIENT RESPONSE WITH MODE CHANGE
(V = 3.8V TO 3.2V TO 3.8V)
STARTUP AND DIMMING
IN
MAX8630Y/Z toc13
MAX8630Y/Z toc14
V
IN
1V/div
5V/div
1V/div
V
AND
ENM
V
ENS
500mV/div
3V
V
OUT
V
OUT
50mA/div
0
I
OUT
I
20mA/div
OUT
20ms/div
200µs/div
Pin Description
PIN
NAME
FUNCTION
MAX8630Z
MAX8630Y
Ground. Connect GND to system ground and the input bypass capacitor as
close to the IC as possible. Connect GND to the exposed pad directly under
the IC.
1
1
GND
Transfer Capacitor 1 Negative Connection. Connect a 1µF ceramic capacitor
from C1P to C1N.
2
3
4
2
3
4
C1N
IN
Supply Voltage Input. Connect a 1µF ceramic capacitor from IN to GND. The
input voltage range is 2.7V to 5.5V.
Transfer Capacitor 2 Negative Connection. Connect a 1µF ceramic capacitor
from C2P to C2N.
C2N
_______________________________________________________________________________________
5
125mA 1x/1.5x Charge Pumps for 5 White LEDs
in 3mm x 3mm TDFN
Pin Description (continued)
PIN
NAME
C2P
FUNCTION
MAX8630Z
MAX8630Y
Transfer Capacitor 2 Positive Connection. Connect a 1µF ceramic capacitor
from C2P to C2N.
5
5
Transfer Capacitor 1 Positive Connection. Connect a 1µF ceramic capacitor
from C1P to C1N.
6
7
6
7
C1P
Output. Connect a 1µF ceramic capacitor from OUT to GND. Connect OUT to
the anodes of all the LEDs. In shutdown, OUT is pulled down by an internal
5kΩ resistor.
OUT
ENS
Enable and Dimming Control for Sub LEDs (LED4 and LED5). Drive ENS logic-
low for greater than 2ms (typ) to disable the sub LEDs. Drive both ENM and
ENS logic-low for greater than 2ms (typ) to shut down the IC. Drive ENS logic-
high to begin soft-start and enable maximum (100%) sub LED current.
Subsequent pulses on ENS cause the sub LED current to decrease in 32 linear
steps. Because of the soft-start delay, it is possible to turn on the IC and
quickly set a dim level so the sub LED current never transitions through the
maximum setting. See the ENM/ENS Dimming Control section.
8
—
Enable and Dimming Control for Main LEDs (LED1, LED2, and LED3). Drive
ENM logic-low for greater than 2ms (typ) to disable the main LEDs. Drive both
ENM and ENS logic-low for greater than 2ms (typ) to shut down the IC. Drive
ENM logic-high to begin soft-start and enable maximum (100%) main LED
current. Subsequent pulses on ENM cause the main LED current to decrease
in 32 linear steps. Because of the soft-start delay, it is possible to turn on the IC
and quickly set a dim level so the main LED current never transitions through
the maximum setting. See the ENM/ENS Dimming Control section.
9
—
ENM
Direct PWM input. PWM controls output current as a percentage of full-scale
current in proportion to PWM signal duty cycle. The frequency range is 900Hz
to 100kHz.
—
—
8
9
PWM
PWM Filter Capacitor Connection. Connect a capacitor from CPWM to GND to
form a filter with the internal 150kΩ resistor. The recommended capacitor for
10Hz corner is 0.1µF.
CPWM
Sub LED Cathode Connections and Charge-Pump Feedback. Current flowing
into LED_ is based on the ENS (or PWM) description above. The charge pump
regulates the lowest LED_ voltage to 0.12V. Connect LED_ to OUT if the
corresponding LED is not populated.
10
11
10
11
LED5
LED4
12
13
12
13
LED3
LED2
Main LED Cathode Connections and Charge-Pump Feedback. Current flowing
into LED_ is based on the ENM (or PWM) description above. The charge pump
regulates the lowest LED_ voltage to 0.12V. Connect LED_ to OUT if the
corresponding LED is not populated.
14
—
14
—
LED1
EP
Exposed Paddle. Connect to GND directly under the IC.
6
_______________________________________________________________________________________
125mA 1x/1.5x Charge Pumps for 5 White LEDs
in 3mm x 3mm TDFN
1µF
1µF
C1P
C1N
C1P
C1N
2.7V TO 5.5V
2.7V TO 5.5V
OUT
OUT
IN
IN
1µF
1µF
MAIN
1µF
1µF
GND
GND
MAX8630Y
MAX8630Z
LED1
LED2
LED3
LED4
LED5
LED1
LED2
LED3
LED4
LED5
CPWM
PWM
ENABLE MAIN
ON/OFF AND
SERIAL DIMMING
ENM
ENS
0.1µF
SUB
ENABLE SUB
ON/OFF AND
SERIAL DIMMING
DIRECT PWM
SIGNAL
C2P C2N
C2P C2N
1µF
1µF
Figure 1. Typical Applications Circuit with the MAX8630Z
Figure 2. Typical Applications Circuit with the MAX8630Y
C1
C2
1µF
1µF
C1P C1N
C2P C2N
INPUT
2.7V TO 5.5V
OUT
IN
1x/1.5x REGULATING
CHARGE PUMP
C
OUT
1µF
C
IN
1µF
GND
MAX8630Y
MAX8630Z
ERROR
AMP 1
OVD
1.25V
ENS
(PWM)
CONTROL AND
REFERENCE
MIN
SELECT
0.12V
ENM
(CPWM)
SUB CONTROL
MAIN CONTROL
0.6V
LED1
LED2
LED3
LED4
LED5
D1
D2
D3
D4
D5
MAX8630Y
ONLY
ERROR
AMP 2
+
+
+
+
+
0.6V
–
–
–
–
–
RSET
( ) ARE FOR MAX8630Y
Figure 3. Functional Diagram
_______________________________________________________________________________________
7
125mA 1x/1.5x Charge Pumps for 5 White LEDs
in 3mm x 3mm TDFN
and the LED output current is then ramped up in 32 lin-
Detailed Description
ear steps. If the current regulators are in dropout at the
The MAX8630_ charge pump drives up to 5 white LEDs
end of this time, the charge pump switches to 1.5x
(3 main LEDs and 2 sub LEDs) with regulated constant
current for uniform intensity. By utilizing adaptive 1x/1.5x
mode and the current regulators are ramped again. If
the output is shorted to ground (V
< 1.25V), the part
OUT
charge-pump modes and very low-dropout current regu-
lators, it achieves 125mA guaranteed output-drive capa-
bility and high efficiency over the 1-cell Li+ battery input
voltage range. 1MHz fixed-frequency switching allows
for tiny external components and the regulation scheme
is optimized to ensure low EMI and low input ripple. The
MAX8630Z provides independent on/off/dimming control
for main and sub displays (see Figure 1). The MAX8630Y
allows direct-PWM dimming of all five LEDs together
(see Figure 2). A functional diagram for the
MAX8630Z/MAX8630Y is shown in Figure 3.
stays in the initial soft-start stage and output current is
limited by the ramped current source. Additionally,
when the main or sub LED current rolls over from 1/32
to full, the LED current regulators soft-start again to
eliminate input current spikes.
ENM/ENS Dimming Control (MAX8630Z)
When the LEDs are enabled (by driving EN_ high), the
MAX8630Z goes through soft-start and brings the LED
current up in 32 linear steps. Dim the MAX8630Z by puls-
ing EN_ low (500ns to 500µs pulse width). Each pulse
reduces the LED current by 1/32nd. After 31 pulses, the
current reaches 1/32, and the next pulse restores the cur-
rent to 100%. Figure 4 shows a timing diagram for EN_.
1x to 1.5x Switchover
When V is higher than V
, the MAX8630_ operates
IN
OUT
in 1x mode and V
is pulled up to V . The internal
If dimming control is not required, ENM and ENS work
as simple on/off controls. Drive ENM/ENS high to
enable the LEDs, or drive ENM/ENS low for shutdown.
The LEDs operate at 100% brightness under these sim-
ple on/off conditions.
OUT
IN
current regulators regulate the LED current. As V
IN
drops, V
eventually falls below the switchover
LEDMIN_
threshold of 88mV, and the MAX8630_ starts switching
in 1.5x mode, and V is regulated to 122mV by
LEDMIN
the charge pump. To switch back to 1x mode, the
MAX8630_ determines if V - V is sufficient to keep
PWM Dimming Control (MAX8630Y)
Dim the MAX8630Y by applying a direct-PWM logic-
level signal to PWM. An internal resistor combined with
the capacitor at CPWM forms a lowpass filter that con-
verts the PWM signal to DC LED current that is propor-
tional to the PWM signal’s duty cycle. All five LEDS are
controlled together on the MAX8630Y. The PWM fre-
quency range is 900Hz to 100kHz.
IN
OUT
V
greater than 88mV. The comparator that
LEDMIN
makes this judgment is adaptive and matches the
switchover for the conditions.
Soft-Start
The MAX8630_ includes soft-start circuitry to eliminate
inrush current at turn-on. When starting up, the output
capacitor is charged directly from the input with a
ramped current source (with no charge-pump action)
until the output voltage approaches the input voltage.
Once this occurs, the charge pump enters 1x mode,
If dimming control is not required, PWM works as a sim-
ple on/off control. Drive PWM high to enable the LEDs,
or drive PWM low for shutdown.
1
2
3
4
5
27
28
29
30
31
32
0
INITIAL t
HI
EN_
> 50µs
t
SHDN
t
SOFT-START
FULL
t
t
HI
LO
FULL
2ms (typ)
31/32
31/32
500ns TO 500µs
>500ns
30/32
29/32
28/32
27/32
I
6/32
LED_
5/32
4/32
3/32
2/32
1/32
SHUTDOWN
SHUTDOWN
Figure 4. MAX8630Z EN_ Timing Diagram
8
_______________________________________________________________________________________
125mA 1x/1.5x Charge Pumps for 5 White LEDs
in 3mm x 3mm TDFN
Shutdown Mode
When both ENM and ENS (or PWM) are held low for
Applications Information
Driving Fewer than 5 LEDs
To avoid overvoltage protection mode when using
fewer than five LEDs, connect any unused LED_ to
OUT. The MAX8630_ contains special circuitry to
detect this condition and disables the corresponding
current regulator to avoid wasting battery current.
2ms (typ) or longer, the MAX8630_ is shut down and
put in a low-current mode. OUT is internally pulled to
GND with 5kΩ during shutdown.
Overvoltage Protection
If any LED fails as an open circuit, the corresponding
V
LED_
goes to 0V, and the output voltage is limited to
Input Ripple
For LED drivers, input ripple is more important than out-
put ripple. Input ripple depends on the source supply’s
output impedance. Adding a lowpass filter to the input
of the MAX8630_ further reduces input ripple.
about 5V by gating on/off the charge pump. In case
any LED_ is floating or grounded, the MAX8630_ oper-
ates in the same overvoltage protection mode. To avoid
overvoltage protection mode when using fewer than
five LEDs, connect any unused LED_ to OUT. The
MAX8630_ contains special circuitry to detect this con-
dition and disables the corresponding current regulator
to avoid wasting battery current.
Alternatively, increasing C to 2.2µF (or 4.7µF) cuts
IN
input ripple in half (or in fourth) with only a small
increase in footprint. The 1x mode always has very low
input ripple.
Thermal Shutdown
The MAX8630_ includes a thermal-protection circuit
that shuts down the IC when the die temperature reach-
es about +160°C. The part turns on after the IC cools
by approximately 20°C.
Component Selection
Ceramic capacitors are recommended due to their
small size, low cost, and low ESR. Select ceramic
capacitors that maintain their capacitance over temper-
ature and DC bias. Capacitors with X5R or X7R temper-
ature characteristics generally perform well. See Table
1 for a list of recommended components. Using a larg-
er value input capacitor helps to reduce input ripple
(see the Input Ripple section).
Temperature Derating Function
The MAX8630 contains a derating function that auto-
matically limits the LED current at high temperatures in
accordance with the recommended derating curve of
popular white LEDs. The derating function enables the
safe usage of higher LED currents at room tempera-
ture, thus reducing the number of LEDs required to
backlight the display. The derating circuit protects the
LEDs from overheating at high PC board temperatures.
The derating circuit limits the LED current by reducing
the internal 600mV reference voltage above +40°C at
approximately -1.67%/°C. The typical derating function
characteristic is shown in the Typical Operating
Characteristics.
PC Board Layout and Routing
The MAX8630_ is a high-frequency, switched-capacitor
voltage regulator. For best circuit performance, use a
solid ground plane and place C , C
, C1, and C2
OUT
IN
as close to the MAX8630_ as possible. See the
MAX8630Z evaluation kit for an example layout.
Chip Information
PROCESS: BiCMOS
Table 1. Recommended Components
DESIGNATION
VALUE
MANUFACTURER
Taiyo Yuden
TDK
PART NUMBER
DESCRIPTION
1µF 20%, 6.3V X5R ceramic capacitors (0402)
1µF 20%, 6.3V X5R ceramic capacitors (0402)
White LEDs
JMK105 BJ105MV
C1005X5R0J105M
NSCW215T
C
, C , C1, C2
IN OUT
1µF
D1–D5
—
Nichia
_______________________________________________________________________________________
9
125mA 1x/1.5x Charge Pumps for 5 White LEDs
in 3mm x 3mm TDFN
Ordering Information (continued)
Selector Guide
FULL-SCALE
CURRENT (mA)
DIMMING
INTERFACE
PIN-
PACKAGE
TOP
MARK
PART
PART
TEMP RANGE
MAX8630YETD15
MAX8630YETD18
MAX8630YETD20
MAX8630YETD25
MAX8630ZETD15
MAX8630ZETD18
MAX8630ZETD20
MAX8630ZETD25
15
18
20
25
15
18
20
25
Direct PWM
Direct PWM
Direct PWM
Direct PWM
Serial Pulse
Serial Pulse
Serial Pulse
Serial Pulse
14 TDFN
MAX8630YETD18 -40°C to +85°C 3mm x 3mm
(T1433-2)
AAT
AAU
AAV
AAW
AAX
AAY
AAZ
14 TDFN
3mm x 3mm
(T1433-2)
MAX8630YETD20 -40°C to +85°C
14 TDFN
MAX8630YETD25 -40°C to +85°C 3mm x 3mm
(T1433-2)
14 TDFN
MAX8630ZETD15 -40°C to +85°C 3mm x 3mm
(T1433-2)
14 TDFN
3mm x 3mm
(T1433-2)
MAX8630ZETD18 -40°C to +85°C
14 TDFN
MAX8630ZETD20 -40°C to +85°C 3mm x 3mm
(T1433-2)
14 TDFN
3mm x 3mm
(T1433-2)
MAX8630ZETD25 -40°C to +85°C
10 ______________________________________________________________________________________
125mA 1x/1.5x Charge Pumps for 5 White LEDs
in 3mm x 3mm TDFN
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.)
D2
D
A2
PIN 1 ID
N
0.35x0.35
b
[(N/2)-1] x e
REF.
PIN 1
INDEX
AREA
E
E2
DETAIL A
e
A1
k
C
C
L
L
A
L
L
e
e
PACKAGE OUTLINE, 6,8,10 & 14L,
TDFN, EXPOSED PAD, 3x3x0.80 mm
1
-DRAWING NOT TO SCALE-
21-0137
G
2
______________________________________________________________________________________ 11
125mA 1x/1.5x Charge Pumps for 5 White LEDs
in 3mm x 3mm TDFN
Package Information (continued)
(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.)
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
DOWNBONDS
ALLOWED
PKG. CODE
T633-1
N
6
D2
E2
e
JEDEC SPEC
MO229 / WEEA
MO229 / WEEA
MO229 / WEEC
MO229 / WEEC
MO229 / WEEC
b
[(N/2)-1] x e
1.90 REF
1.90 REF
1.95 REF
1.95 REF
1.95 REF
2.00 REF
2.40 REF
2.40 REF
1.50±0.10 2.30±0.10 0.95 BSC
1.50±0.10 2.30±0.10 0.95 BSC
1.50±0.10 2.30±0.10 0.65 BSC
1.50±0.10 2.30±0.10 0.65 BSC
1.50±0.10 2.30±0.10 0.65 BSC
0.40±0.05
0.40±0.05
0.30±0.05
0.30±0.05
0.30±0.05
NO
NO
T633-2
6
T833-1
8
NO
T833-2
8
NO
T833-3
8
YES
NO
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±0.05
0.20±0.05
YES
NO
PACKAGE OUTLINE, 6,8,10 & 14L,
TDFN, EXPOSED PAD, 3x3x0.80 mm
2
-DRAWING NOT TO SCALE-
21-0137
G
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.
12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2005 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products, Inc.
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