MAX8631XETI Maxim Integrated Products, MAX8631XETI Datasheet

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MAX8631XETI

Manufacturer Part Number
MAX8631XETI
Description
LED Drivers 1x/1.5x/2x White LED Charge Pump
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX8631XETI

Number Of Segments
8
Low Level Output Current
400 mA
Operating Supply Voltage
2.7 V to 5.5 V
Maximum Supply Current
4 mA
Maximum Power Dissipation
1666 mW
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Package / Case
TQFN-28
Minimum Operating Temperature
- 40 C
Lead Free Status / Rohs Status
No

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Manufacturer
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Price
Part Number:
MAX8631XETI+
Manufacturer:
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Quantity:
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The MAX8631X/Y charge pump drives up to eight white
LEDs with regulated constant current for uniform inten-
sity. The main group of LEDs (M1–M4) can be driven
up to 30mA per LED for backlighting. The flash group
of LEDs (F1–F4) is independently controlled and can be
driven up to 100mA per LED (or 400mA total). Two
200mA LDOs are on-board to provide power for cam-
era functions. The LDOs’ output voltages are pin-pro-
grammable to meet different camera-module
requirements. By utilizing adaptive 1x/1.5x/2x charge-
pump modes and very-low-dropout current regulators,
the MAX8631X/Y achieves high efficiency over the full
1-cell lithium-battery voltage range. The 1MHz fixed-fre-
quency switching allows for tiny external components,
and the regulation scheme is optimized to ensure low
EMI and low input ripple.
The MAX8631X/Y is available in a 28-pin thin QFN,
4mm x 4mm lead-free package (0.8mm max height).
19-3688; Rev 3; 6/08
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.
DUAL-LDO ON/OFF
AND DIMMING
MAIN ON/OFF
FLASH ON/OFF
SELECTION
DUAL-LDO
INPUT
2.7V TO 5.5V
VOLTAGE
10μF
Camera Phones and Smartphones
Backlighting and Flash
PDAs, Digital Cameras, and Camcorders
PIN
IN
GND
PGND
ENM1
ENM2
ENF
ENLDO
P1
P2
C1P
SETM
Typical Operating Circuit
1μF
C1N
________________________________________________________________ Maxim Integrated Products
MAX8631X/Y
SETF
1x/1.5x/2x White LED Charge Pump with
C2P
General Description
1μF
REF
C2N
LDO1
LDO2
OUT
M1
M2
M3
M4
0.01μF
F1
F2
F3
F4
UP TO 480mA
Two LDOs in 4mm x 4mm Thin QFN
OUTPUT
10μF
1μF
Applications
1μF
MAIN
MODULE
CAMERA
FLASH
♦ Powers Up to 8 LEDs
♦ Two Internal Low-Noise 200mA LDOs
♦ 94% Max/85% Avg Efficiency (P
♦ 0.2% Typical LED Current Matching
♦ Adaptive 1x/1.5x/2x Mode Switchover
♦ Single-Wire Serial Pulse Interface for Brightness
♦ Thermal T
♦ Low Input Ripple and EMI
♦ 2.7V to 5.5V Supply Voltage Range
♦ Soft-Start, Overvoltage, and Thermal-Shutdown
♦ 28-Pin Thin QFN, 4mm x 4mm Package
* EP = Exposed pad.
+ Denotes a lead-free package.
Pin Configuration appears at end of data sheet.
MAX8631XETI+
MAX8631YETI+
Battery Discharge
Control (32 Steps)
Protection
Up to 30mA/LED Drive for Backlight
Up to 400mA Total Drive for Flash
PART
A
Derating Function
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
Ordering Information
LED
PIN-PACKAGE
28 Thin QFN-EP*
4mm x 4mm (T2844-1)
28 Thin QFN-EP*
4mm x 4mm (T2844-1)
/P
BATT
Features
) over Li+
1

Related parts for MAX8631XETI

MAX8631XETI Summary of contents

Page 1

... Thermal T ♦ Low Input Ripple and EMI ♦ 2.7V to 5.5V Supply Voltage Range Applications ♦ Soft-Start, Overvoltage, and Thermal-Shutdown Protection ♦ 28-Pin Thin QFN, 4mm x 4mm Package PART MAX8631XETI+ MAIN FLASH MAX8631YETI Exposed pad. + Denotes a lead-free package. CAMERA MODULE 1μF Pin Configuration appears at end of data sheet ...

Page 2

White LED Charge Pump with Two LDOs in 4mm x 4mm Thin QFN ABSOLUTE MAXIMUM RATINGS PIN, IN, OUT, REFBP to GND................................-0.3V to +6.0V SETF, SETM, ENLDO, ENM1, ENM2, ENF, P1, P2, LDO1, LDO2 to GND....................-0. M1, ...

Page 3

White LED Charge Pump with Two ELECTRICAL CHARACTERISTICS (continued 3.6V 0V, ENM1 = ENM2 = ENF = IN GND PGND T = -40°C to +85°C, unless otherwise noted. Typical values are ...

Page 4

White LED Charge Pump with Two LDOs in 4mm x 4mm Thin QFN ELECTRICAL CHARACTERISTICS (continued 3.6V 0V, ENM1 = ENM2 = ENF = IN GND PGND T = -40°C to ...

Page 5

White LED Charge Pump with Two LDOs in 4mm x 4mm Thin QFN ( 3.6V, circuit of Figure EN_ BATTERY CURRENT vs. SUPPLY VOLTAGE DRIVING FLASH 900 800 700 I = 400mA FLASH ...

Page 6

White LED Charge Pump with Two LDOs in 4mm x 4mm Thin QFN ( 3.6V, Circuit of Figure EN_ INDIVIDUAL FLASH LED CURRENT vs. R 1000 100 SETF ...

Page 7

White LED Charge Pump with Two ( 3.6V, circuit of Figure EN_ SINGLE-WIRE DIMMING RESPONSE V ENM1, V ENM2 I OUT V OUT 10ms/div LDO OUTPUT VOLTAGE ACCURACY vs. OUTPUT CURRENT 1.0 0.8 ...

Page 8

White LED Charge Pump with Two LDOs in 4mm x 4mm Thin QFN INPUT C1P 2.7V TO 5.5V PIN IN C1 10μF GND PGND REFBP C8 0.01μF CONTROL AND ENM1 REFERENCE ENM2 0.15V ENF FLASH CONTROL MAIN CONTROL ENLDO ...

Page 9

White LED Charge Pump with Two PIN NAME Supply Voltage Input. Bypass to PGND with a 10µF ceramic capacitor. The input voltage range is 1 PIN 2.7V to 5.5V. PIN is high impedance during shutdown. Chip Supply Voltage Input. ...

Page 10

... MAX8631X/Y starts switching in 2x mode. When the input voltage rises above two-thirds V by approximately 50mV, OUT the MAX8631X/Y switches back to 1.5x mode. True Shutdown is a trademark of Maxim Integrated Products, Inc. 10 ______________________________________________________________________________________ Pin Description (continued) FUNCTION The MAX8631X/Y includes soft-start circuitry to limit inrush current at turn-on ...

Page 11

White LED Charge Pump with Two INITIAL t HI ≥ 200μ ENM1 AND ENM2 OR t SOFT-START ENF 32/32 31/ SHUTDOWN Figure 2. ENM_ and ENF Timing Diagram Thermal Shutdown The MAX8631X/Y ...

Page 12

White LED Charge Pump with Two LDOs in 4mm x 4mm Thin QFN INPUT 2.7V TO 5.5V 10μF MAIN ON/OFF AND DIMMING FLASH ON/OFF AND DIMMING ON/OFF VOLTAGE SELECTION Figure 3. Dimming Using Single-Wire, Serial-Pulse Interface INPUT 2.7V TO ...

Page 13

White LED Charge Pump with Two INPUT 2.7V TO 5.5V 10μF ON/OFF AND VOLTAGE SELECTION Figure 5. Schematic for When Fewer than 8 LEDs Is Acceptable Typical operating waveforms shown in the Typical Operating Characteristics show input ripple current ...

Page 14

... X7R ceramic capacitor (0402) Nichia NSCW215T White LEDs Nichia NBCW011T White LEDs, 4 LEDs in one package — 1% resistor Vishay TOP VIEW C1P PGND DOCUMENT NO. 21-0139 P1 DESCRIPTION Pin Configuration MAX8631XETI MAX8631YETI THIN QFN 4mm x 4mm, 0.4mm LEAD PITCH SETM ...

Page 15

... 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 15 © 2008 Maxim Integrated Products ...

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