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PDF MAX1577Y Data sheet ( Hoja de datos )
| Número de pieza | MAX1577Y | |
| Descripción | 1.2A White LED Regulating Charge Pump | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-3461; Rev 0; 11/04
EVALUATION KIT AVAILABLE
www.DataSheet4U.com
1.2A White LED Regulating Charge Pump for
Camera Flashes and Movie Lights
General Description
The MAX1577Y/MAX1577Z charge pumps drive white
LEDs, including camera strobes, with regulated current
up to 1.2A (guaranteed to 800mA). The very low open-
loop output resistance allows high flash brightness,
even from a low battery input voltage. The adaptive
1x/2x regulating charge-pump operation provides high
efficiency (up to 92%) while in movie mode or back-
lighting. Fast (1MHz) switching allows the use of tiny
external components.
The MAX1577Y/MAX1577Z use an external resistor to
set the full-scale LED current. Two enable inputs (EN1
and EN2) provide simple on/off control and LED current
of 20%, 33%, or 100% full scale. If there is less than
24mV across the external resistor, the output voltage is
regulated. The MAX1577Z has fixed 5.1V output-volt-
age regulation, while the MAX1577Y has logic-con-
trolled output voltage of 3.4V, 4.6V, or 5.1V for
backlighting, keyboard, and RGB applications.
The MAX1577Y/MAX1577Z are available in an 8-pin,
3mm x 3mm TDFN package (0.8mm max height).
Applications
White LED Flashes, Strobes, and Movie Lights
LCD Backlighting
Camera Phones, Cell Phones, and Smart Phones
PDAs, Digital Cameras, and Camcorders
Features
♦ Up to 1.2A Output Drive Capability (800mA
Guaranteed)
♦ Up to 92% PLED / PBATT Efficiency for Movie
Mode
♦ Flexible Brightness Control
Two-Bit Logic for 100%, 33%, 20%, and Off
PWM for 20% to 100%
♦ 3% Current Regulation Over Line and
Temperature
♦ Current or Voltage Regulation for Flash and
Backlighting (MAX1577Y)
♦ Current Regulation for Flash (MAX1577Z)
♦ Low Ripple and EMI
♦ 2.7V to 5.5V Supply Voltage Range
♦ Soft-Start Limits Inrush Current
♦ Output-Voltage Regulation Mode
♦ Thermal-Shutdown Protection
♦ 8-Pin 3mm x 3mm TDFN Package
Ordering Information
PART
MAX1577YETA
TEMP RANGE
-40°C to +85°C
PIN-
PACKAGE
8 TDFN
(T833-2)
TOP
MARK
AMG
MAX1577ZETA
-40°C to +85°C
8 TDFN
(T833-2)
AMQ
Typical Operating Circuit
1µF OR 2.2µF
2.7V TO 5.5V
4.7µF
CP
IN
GND
CN
5.3V OVP
OUT
10µF
UP TO 1.2A
100%,
33%, 20%,
AND
SHUTDOWN
MAX1577Z
EN1 CS
VOUT - (300mV OR
100mV OR 60mV)
EN2
TOP VIEW
Pin Configuration
876 5
MAX1577Y
MAX1577Z
1234
TDFN
________________________________________________________________ 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  
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1.2A White LED Regulating Charge Pump for
Camera Flashes and Movie Lights
Pin Description
PIN NAME
1 EN1 Control Logic Input (see Table 1)
FUNCTION
2 CP Transfer Capacitor Positive Connection. Connect a 1µF capacitor (or 2.2µF for IOUT > 600mA) from
CP to CN.
3 CN Transfer Capacitor Negative Connection. Connect a 1µF capacitor (or 2.2µF for IOUT > 600mA) from
CP to CN.
4 EN2 Control Logic Input (see Table 1)
5
GND
Ground
6 IN Input Supply Voltage. Connect IN to a battery or supply voltage from 2.7V to 5.5V. Connect a 4.7µF
ceramic capacitor from IN to GND.
7
CS
Current-Sense Input. Connect a current-sense resistor from OUT to CS to set the output current.
Connect the anodes of the LEDs to CS and the cathodes to GND.
8
OUT
Output. Connect a 10µF ceramic capacitor from OUT to GND. In shutdown, OUT is pulled to GND
with an internal 5kΩ resistor.
— EP Exposed Pad. Connect the exposed pad to GND directly under the IC.
Table 1. Enable, Dimming, Voltage Mode, and Overvoltage Protection
EN1 EN2 DIMMING LEVEL CS THRESHOLD
VOLTAGE MODE
OVP
(VOUT - VCS)
MAX1577Z MAX1577Y MAX1577Z MAX1577Y
00
Shutdown
—
————
0 1 20% Current
60mV
5.10V
3.40V
5.30V
5.15V
1 0 33% Current
100mV
5.10V
4.60V
5.30V
5.17V
1 1 100% Current
300mV
5.10V
5.10V
5.30V
5.30V
Note: A “0” indicates EN_ is logic low or connected to GND. A “1” indicates EN_ is logic high or connected to IN.
_______________________________________________________________________________________ 5
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1.2A White LED Regulating Charge Pump for
Camera Flashes and Movie Lights
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.)
PIN 1
INDEX
AREA
D
N
E E2
DETAIL A
CL
L
A
e
CL
L
e
NUMBER OF LEADS SHOWN ARE FOR REFERENCE ONLY
PACKAGE OUTLINE, 6, 8, 10 & 14L,
TDFN, EXPOSED PAD, 3x3x0.80 mm
21-0137
F
1
2
COMMON DIMENSIONS
SYMBOL
A
D
E
A1
L
k
A2
MIN. MAX.
0.70 0.80
2.90 3.10
2.90 3.10
0.00 0.05
0.20 0.40
0.25 MIN.
0.20 REF.
PACKAGE VARIATIONS
PKG. CODE
N
D2
T633-1
6 1.50±0.10
T833-1
8 1.50±0.10
T1033-1
10 1.50±0.10
T1433-1
14 1.70±0.10
T1433-2
14 1.70±0.10
E2
2.30±0.10
2.30±0.10
2.30±0.10
2.30±0.10
2.30±0.10
e
0.95 BSC
0.65 BSC
0.50 BSC
0.40 BSC
0.40 BSC
JEDEC SPEC
MO229 / WEEA
MO229 / WEEC
MO229 / WEED-3
----
----
b [(N/2)-1] x e
0.40±0.05 1.90 REF
0.30±0.05 1.95 REF
0.25±0.05 2.00 REF
0.20±0.03 2.40 REF
0.20±0.03 2.40 REF
PACKAGE OUTLINE, 6, 8, 10 & 14L,
TDFN, EXPOSED PAD, 3x3x0.80 mm
21-0137
F
2
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11
© 2004 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet MAX1577Y.PDF ] | |
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