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PDF MAX1707 Data sheet ( Hoja de datos )
| Número de pieza | MAX1707 | |
| Descripción | Light-Management IC | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX1707 (archivo pdf) en la parte inferior de esta página. Total 15 Páginas | ||
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19-3744; Rev 0; 7/05
www.DataSheet4U.com
EVALUATION KIT
AVAILABLE
Light-Management IC with Efficient 1x/1.5x/2x
Charge Pump for Backlight/Flash/RGB LEDs
General Description
The MAX1707 provides complete light management for
main display backlight, subdisplay backlight (or RGB
indicator), and white LED camera flash with regulated
constant current up to 610mA total. By utilizing adap-
tive 1x/1.5x/2x charge-pump modes and very-low-
dropout current regulators, it achieves high efficiency
over the full 1-cell Li+ battery input voltage range. The
1MHz fixed-frequency switching allows for tiny external
components while 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 MAX1707 features an internally trimmed reference
to set the maximum LED current. An I2C† serial port is
used for on/off control and setting the LED currents in
32 linear steps. When using the RGB indicator, the I2C
port provides 32k colors and programmable ramp-
up/down rates. The camera flash may be turned on/off
by the I2C port or a separate digital logic input.
Applications
Cell Phones and Smartphones
PDAs, Digital Cameras, Camcorders
Displays with Up to 11 LEDs
†Purchase of I2C components from Maxim Integrated Products,
Inc., or one of its sublicensed Associated Companies, conveys
a license under the Philips I2C Patent Rights to use these com-
ponents in an I2C system, provided that the system conforms to
the I2C Standard Specification as defined by Philips.
Features
♦ Guaranteed 610mA Continuous Drive Capability
4 LEDs at 30mA Each for Main Display
3 LEDs at 30mA Each for Sub or RGB
400mA Total for Flash
♦ 2-Wire I2C Serial Port
5-Bit (32-Step) Linear Dimming
32k Colors
Ramp-Up/Down Rates
♦ 92% Peak/83% Avg Efficiency (PLED/PBATT)
♦ Adaptive 1x/1.5x/2x Mode Switchover
♦ 0.3% (typ) LED Current Accuracy and Matching
♦ Low Input Ripple and EMI
♦ Low 0.1µA Shutdown Current
♦ Output Overvoltage Protection
♦ Thermal Derating Function Protects LEDs
♦ 24-Pin 4mm x 4mm Thin QFN Package
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
MAX1707ETG
-40°C to +85°C
24 Thin QFN
4mm x 4mm
PKG
CODE
T2444-4
Pin Configuration appears at end of data sheet.
Typical Operating Circuit
INPUT
2.7V TO 5.5V
4.7µF
VLOGIC
0.1µF
I2C PORT
ON/OFF AND
BRIGHTNESS
STROBE
ON/OFF
1µF 1µF
C1P
IN
PIN
C1N
C2P C2N
OUT
OUTPUT
UP TO 610mA
10µF
GND
MAX1707
VDD
SCK
SDA
STB
PGND
M1
M2
M3
M4
S1
S2
S3
F1
F2
F3
F4
MAIN
SUB OR RGB
FLASH
________________________________________________________________ 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.
1 page  
www.DataSheet4U.com
Light-Management IC with Efficient 1x/1.5x/2x
Charge Pump for Backlight/Flash/RGB LEDs
(TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
OPERATING WAVEFORMS 1X MODE
MAX1707 toc09
OPERATING WAVEFORMS 1.5X MODE
MAX1707 toc10
VOUT
50mV/div
VOUT
50mV/div
(AC-COUPLED)
(AC-COUPLED)
VIN
50mV/div
VIN
50mV/div
(AC-COUPLED)
(AC-COUPLED)
IIN
100mA/div
IIN
100mA/div
00
1µs/div
1µs/div
OPERATING WAVEFORMS 2X MODE
MAX1707 toc11
MAIN BACKLIGHT STARTUP WAVEFORM
MAX1707 toc12
VSDA 5V/div
VOUT
50mV/div
(AC-COUPLED)
1V/div
VOUT
VIN
50mV/div
(AC-COUPLED)
IIN 100mA/div
0
IIN
0
200mA/div
0
1µs/div
1ms/div
MAIN STARTUP WITH RGB ALREADY ON
MAX1707 toc13
VSDA 5V/div
VOUT 1V/div
FLASH STARTUP WAVEFORM
MAX1707 toc14
VSDA 5V/div
1V/div
VOUT
00
IIN
200mA/div
IIN
200mA/div
00
1ms/div
1ms/div
_______________________________________________________________________________________ 5
5 Page 
www.DataSheet4U.com
Light-Management IC with Efficient 1x/1.5x/2x
Charge Pump for Backlight/Flash/RGB LEDs
Table 3. Control Data Byte (Hexadecimal)
CONTROL BYTE (HEXADECIMAL)
MAIN SUB1 SUB2 SUB3 FLASH
20 40 60 80 A0
21 41 61 81 A1
22 42 62 82 A2
23 43 63 83 A3
24 44 64 84 A4
25 45 65 85 A5
26 46 66 86 A6
27 47 67 87 A7
28 48 68 88 A8
29 49 69 89 A9
2A 4A 6A 8A AA
2B 4B 6B 8B AB
2C 4C 6C 8C AC
2D 4D 6D 8D AD
2E 4E 6E 8E AE
2F 4F 6F 8F AF
30 50 70 90 B0
31 51 71 91 B1
32 52 72 92 B2
33 53 73 93 B3
34 54 74 94 B4
35 55 75 95 B5
36 56 76 96 B6
37 57 77 97 B7
38 58 78 98 B8
39 59 79 99 B9
3A 5A 7A 9A BA
3B 5B 7B 9B BB
3C 5C 7C 9C BC
3D 5D 7D 9D BD
3E 5E 7E 9E BE
3F 5F 7F 9F BF
Note: Defaults in bold.
STROBE
C0
C1
C2
C3
C4
C5
C6
C7
C8
C9
CA
CB
CC
CD
CE
CF
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
DA
DB
DC
DD
DE
DF
MAIN
0.9
1.9
2.8
3.8
4.7
5.6
6.6
7.5
8.4
9.4
10.3
11.3
12.2
13.1
14.1
15.0
15.9
16.9
17.8
18.8
19.7
20.6
21.6
22.5
23.4
24.4
25.3
26.3
27.2
28.1
29.1
30.0
SUB1
0.9
1.9
2.8
3.8
4.7
5.6
6.6
7.5
8.4
9.4
10.3
11.3
12.2
13.1
14.1
15.0
15.9
16.9
17.8
18.8
19.7
20.6
21.6
22.5
23.4
24.4
25.3
26.3
27.2
28.1
29.1
30.0
LED CURRENT (mA)
SUB2 SUB3 FLASH
0.9 0.9 3.3
1.9 1.9 6.5
2.8 2.8 9.7
3.8 3.8 12.9
4.7 4.7 16.2
5.6 5.6 19.4
6.6 6.6 22.6
7.5 7.5 25.8
8.4 8.4 28.9
9.4 9.4 32.1
10.3 10.3 35.4
11.3 11.3 38.6
12.2 12.2 41.6
13.1 13.1 44.7
14.1 14.1 47.9
15.0 15.0 51.0
15.9 15.9 54.1
16.9 16.9 57.2
17.8 17.8 60.3
18.8 18.8 63.4
19.7 19.7 66.3
20.6 20.6 69.6
21.6 21.6 72.7
22.5 22.5 75.8
23.4 23.4 78.8
24.4 24.4 81.9
25.3 25.3 84.9
26.3 26.3 87.9
27.2 27.2 91.0
28.1 28.1 94.0
29.1 29.1 97.0
30.0 30.0 100.0
STROBE
3.3
6.5
9.7
12.9
16.2
19.4
22.6
25.8
28.9
32.1
35.4
38.6
41.6
44.7
47.9
51.0
54.1
57.2
60.3
63.4
66.3
69.6
72.7
75.8
78.8
81.9
84.9
87.9
91.0
94.0
97.0
100.0
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet MAX1707.PDF ] | |
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