MAX8630W Datasheet, PDF (1/12 Pages) Maxim Integrated Products – 125mA 1x/1.5x Charge Pumps for 5 White LEDs in 3mm x 3mm TDFN

19-0825; Rev 0; 5/07
EVAALVUAAILTAIOBNLEKIT
125mA 1x/1.5x Charge Pumps for
5 White LEDs in 3mm x 3mm TDFN
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
Typical Operating Circuit
INPUT
2.7V TO 5.5V
1μF
ENABLE MAIN
ON/OFF AND
DIMMING
ENABLE SUB
ON/OFF AND
DIMMING
1μF
C1P C1N
IN
OUT
GND _MAX8630X
LED1
LED2
ENM
LED3
LED4
ENS
LED5
C2P C2N
OUTPUT
1μF
MAIN
SUB
1μF
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
Ordering Information
PART
PIN-
PACKAGE
TOP
MARK
PKG
CODE
MAX8630WETD15+T
14 TDFN-14
(3mm x 3mm)
ADQ
T1433-2
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.
Ordering Information continued at end of data sheet.
Selector Guide appears at end of data sheet.
Pin Configuration
TOP VIEW
14 13 12 11 10 9 8
MAX8630W
MAX8630X
1234567
TDFN
3mm × 3mm
( ) ARE FOR MAX8630W
________________________________________________________________ Maxim Integrated Products 1
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