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MAX8630XETD15+T

P1-P3P4-P6P7-P9P10-P12
General Description
The MAX8630W/MAX8630X 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.
The MAX8630W/MAX8630X are factory trimmed for full-
scale LED current options of 15mA, 18mA, 20mA, and
25mA. The MAX8630X 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 MAX8630W 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 4ms, the MAX8630_ enters
shutdown. The MAX8630W/MAX8630X are available in a
14-pin, 3mm x 3mm TDFN package (0.8mm max height).
Applications
Display Backlight (Up to 5 LEDs)
Main (3 LEDs) + Sub (2 LEDs) Displays
Cell Phones and Smartphones
PDAs, Digital Cameras, and Camcorders
Features
♦ 93% Max/85% Avg. Efficiency (P
LED
/P
BATT
) Over
Li+ Battery Discharge
♦ 1% LED Current Accuracy
♦ 125mA Total Drive Capability
♦ Adaptive 1x/1.5x Mode Switchover
♦ Single-Wire, Serial-Pulse Dimming (MAX8630X)
Independent On/Off/Dimming for Main and Sub
Linear—Full, 31/32nd, 30/32nd, … 1/32nd
♦ Direct-PWM Dimming (MAX8630W)
♦ 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
MAX8630W/MAX8630X
125mA 1x/1.5x Charge Pumps for
5 White LEDs in 3mm x 3mm TDFN
________________________________________________________________ Maxim Integrated Products 1
1234567
14
13 12 11 10 9 8
LED2
LED1
LED3
LED5
C2P
C2N
IN
C1N
GND
TDFN
3mm × 3mm
TOP VIEW
( ) ARE FOR MAX8630W
ENM (CPWM)
ENS (PWM)
C1P
OUT
MAX8630W
MAX8630X
LED4
Pin Configuration
Ordering Information
MAX8630X
1μF
1μF
1μF
1μF
IN
GND
ENM
ENS
OUT
C1P C1N
MAIN
OUTPUT
SUB
C2P C2N
ENABLE MAIN
ON/OFF AND
DIMMING
ENABLE SUB
ON/OFF AND
DIMMING
INPUT
2.7V TO 5.5V
LED1
LED2
LED3
LED4
LED5
Typical Operating Circuit
19-0825; Rev 0; 5/07
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.
Ordering Information continued at end of data sheet.
EVALUATION KIT
AVAILABLE
PART
PIN-
PACKAGE
TOP
MARK
PKG
CODE
MAX8630WETD15+T
14 TDFN-14
(3mm x 3mm)
ADQ
T1433-2
Selector Guide appears at end of data sheet.
Note:
All devices are specified to operate over the -40°C to
+85°C operating temperature range.
+Denotes a lead-free package.
T = Tape and reel.
MAX8630W/MAX8630X
125mA 1x/1.5x Charge Pumps for 5 White LEDs
in 3mm x 3mm TDFN
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
IN
= 3.6V, V
GND
= 0V, EN_ (PWM) = IN, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
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.
IN, OUT to GND.....................................................-0.3V to +6.0V
C1N, C2N, ENM, CPWM, ENS,
PWM to GND ............................................-0.3V to (V
IN
+ 0.3V)
LED_ to GND ............................................-0.3V to (V
OUT
+ 0.3V)
C1P, C2P to GND ...-0.3V to greater of (V
OUT
+ 1V) or (V
IN
+ 1V)
OUT Short Circuit to GND ..........................................Continuous
Continuous Power Dissipation (T
A
= +70°C)
14-Pin TDFN 3mm x 3mm
(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
PARAMETER CONDITIONS
MIN
TYP
UNITS
IN Operating Voltage 2.7 5.5 V
Undervoltage-Lockout Threshold
V
IN
rising or falling
2.20 2.45 2.65
V
Undervoltage-Lockout Hysteresis
100
mV
Output Overvoltage Protection
Threshold
V
OUT
rising, any LED_ = GND 5 V
1/32nd setting, 1.5x mode 1.4
No-Load Supply Current
1/32nd setting, 1x mode
0.35
mA
T
A
= +25°C 0.01
2
Shutdown Supply Current ENM = ENS (PWM) = GND
T
A
= +85°C
0.1
µA
Soft-Start Time (t
SOFT-START
) 2ms
MAX8630_ETD15 15
MAX8630_ETD18 18
MAX8630_ETD20 20
Full-Scale LED Current
MAX8630_ETD25 25
mA
T
A
= +25°C -1
±0.3
+1
Full-Scale LED Current Accuracy
T
A
= -40°C to derating function start temperature
-3.5 ±0.3 +3.5
%
Derating Function Start
Temperature
40 °C
Derating Function Slope T
A
= +40°C to +85°C
-1.67
%/°C
LED_ Dropout Voltage 100% LED setting (Note 2) 40 75 mV
1x to 1.5x Mode Transition
Threshold
V
LED_
falling 88 mV
Input Voltage Mode Transition
Hysteresis
70 mV
1.5x Mode Regulation Voltage Minimum of V
LED_
122
mV
OUT Pulldown Resistance in
Shutdown
ENM = ENS (PWM) = GND 5 kΩ
MAX8630W/MAX8630X
125mA 1x/1.5x Charge Pumps for 5 White LEDs
in 3mm x 3mm TDFN
_______________________________________________________________________________________ 3
Note 1: Limits are 100% production tested at T
A
= +25°C. Limits over the operating temperature range are guaranteed by design.
Note 2: Dropout voltage is defined as the LED_ to GND voltage at which current into LED_ drops 10% from the value at V
LED_
= 0.2V.
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 3.6V, V
GND
= 0V, EN_ (PWM) = IN, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER CONDITIONS
MIN
TYP
UNITS
1x mode, (V
IN
- V
OUT
) / I
OUT
0.8 1.5
Open-Loop OUT Resistance
1.5x mode, (1.5V
IN
- V
OUT
) / I
OUT
3.2 7.2
Ω
Maximum OUT Current V
IN
≥ 3.2V, V
OUT
= 3.9V
125
mA
OUT Short-Circuit Current Limit V
OUT
< 1.25V 57 mA
Switching Frequency 1
MHz
Direct-PWM Dimming Filter
Corner Frequency (MAX8630W)
C
CPWM
= 0.1µF, (PWM frequency of 900Hz to 200kHz
recommended)
10 Hz
EN_ (PWM) High Voltage V
IN
= 2.7V to 5.5V 1.4 V
EN_ (PWM) Low Voltage V
IN
= 2.7V to 5.5V 0.4 V
EN_ (PWM) Minimum Input
Slew Rate
V
IN
= 2.7V to 5.5V (recommended minimum slew rate) 1 V/µs
T
A
= +25°C
0.01
1
EN_ (PWM) Input Current V
EN_ (PWM)
= 0V or 5.5V
T
A
= +85°C 0.1
µA
EN_ (PWM) Low Shutdown Delay
(t
SHDN
)
4ms
EN_ t
LO
(See Figure 4) 0.5
500.0
µs
EN_ t
HI
(See Figure 4) 0.5 µs
Initial EN_ t
HI
(See Figure 4) First EN_ (PWM) high pulse 50 µs
Thermal Shutdown
+160
°C
Thermal-Shutdown Hysteresis 20 °C
Typical Operating Characteristics
(V
IN
= 3.6V, ENM = ENS = IN, T
A
= +25°C, unless otherwise noted.)
EFFICIENCY vs. INPUT VOLTAGE
DRIVING 5 LEDs
MAX8630W/X toc01
INPUT VOLTAGE (V)
EFFICIENCY (%)
3.93.63.33.0
10
20
30
40
50
60
70
80
90
100
0
2.7 4.2
I
LED
= 1.875mA
I
LED
= 8.125mA
I
LED
= 20mA
V
IN
FALLING
INPUT CURRENT vs. INPUT VOLTAGE
DRIVING 5 LEDs
MAX8630W/X toc02
INPUT VOLTAGE (V)
INPUT CURRENT (mA)
3.93.63.0 3.3
20
40
60
80
120
100
140
160
0
2.7 4.2
I
LED
= 8.125mA
I
LED
= 1.875mA
I
LED
= 20mA
V
IN
FALLING
INPUT CURRENT vs. INPUT VOLTAGE
DRIVING 3 MAIN LEDs
MAX8630W/X toc03
INPUT VOLTAGE (V)
INPUT CURRENT (mA)
3.93.63.0 3.3
20
40
60
80
120
100
140
160
0
2.7 4.2
I
LED
= 8.125mA
I
LED
= 1.875mA
I
LED
= 20mA
V
IN
FALLING
P1-P3P4-P6P7-P9P10-P12

MAX8630XETD15+T

Mfr. #:
Buy MAX8630XETD15+T
Manufacturer:
Maxim Integrated
Description:
LED Lighting Drivers 125mA 1x/1.5x Charge Pump for 5 WLEDs
Lifecycle:
New from this manufacturer.
Delivery:
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