MAX1577ZETA-T Maxim Integrated Products, MAX1577ZETA-T Datasheet

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MAX1577ZETA-T

Manufacturer Part Number
MAX1577ZETA-T
Description
Charge Pumps
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX1577ZETA-T

Function
Step Up, Step Down
Output Voltage
5.1 V
Output Current
1200 mA
Maximum Operating Temperature
+ 85 C
Package / Case
TDFN-8 EP
Minimum Operating Temperature
- 40 C
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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).
19-3461; Rev 0; 11/04
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.
SHUTDOWN
33%, 20%,
White LED Flashes, Strobes, and Movie Lights
LCD Backlighting
Camera Phones, Cell Phones, and Smart Phones
PDAs, Digital Cameras, and Camcorders
2.7V TO 5.5V
100%,
4.7µF
AND
1.2A White LED Regulating Charge Pump for
Typical Operating Circuit
IN
GND
EN1
EN2
CP
________________________________________________________________ Maxim Integrated Products
1µF OR 2.2µF
MAX1577Z
General Description
CN
OUT
CS
5.3V OVP
V
100mV OR 60mV)
OUT
Camera Flashes and Movie Lights
Applications
- (300mV OR
10µF
UP TO 1.2A
♦ Up to 1.2A Output Drive Capability (800mA
♦ Up to 92% P
♦ Flexible Brightness Control
♦ 3% Current Regulation Over Line and
♦ Current or Voltage Regulation for Flash and
♦ 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
MAX1577YETA
MAX1577ZETA
TOP VIEW
Guaranteed)
Mode
Temperature
Backlighting (MAX1577Y)
Two-Bit Logic for 100%, 33%, 20%, and Off
PWM for 20% to 100%
PART
LED
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
/ P
1
8
Ordering Information
BATT
MAX1577Y
MAX1577Z
2
7
TDFN
Pin Configuration
Efficiency for Movie
3
6
PIN-
PACKAGE
8 TDFN
(T833-2)
8 TDFN
(T833-2)
4
5
Features
MARK
AMG
AMQ
TOP
1

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MAX1577ZETA-T Summary of contents

Page 1

... 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 Applications PART MAX1577YETA MAX1577ZETA TOP VIEW UP TO 1.2A 10µF - (300mV OR Features / P Efficiency for Movie LED ...

Page 2

White LED Regulating Charge Pump for Camera Flashes and Movie Lights ABSOLUTE MAXIMUM RATINGS IN, OUT, EN1, EN2 to GND ...................................-0.3V to +6.0V OUT to GND During Shutdown....................-0. OUT to CS .............................................................-0.6V to +0. GND................................................-0.3V ...

Page 3

White LED Regulating Charge Pump for ELECTRICAL CHARACTERISTICS (continued 3.6V, circuit of Figure 2, EN1 = EN2 = IN otherwise noted. Typical values are at T PARAMETER V IN EN_ Logic-High Voltage V IN EN_ ...

Page 4

White LED Regulating Charge Pump for Camera Flashes and Movie Lights (V = 3.6V, circuit of Figure 0.27Ω, Luxeon LXCL-PWF1 LED LED CURRENT vs. TEMPERATURE 225 220 215 210 205 R = 0.27Ω ...

Page 5

White LED Regulating Charge Pump for PIN NAME 1 EN1 Control Logic Input (see Table 1) Transfer Capacitor Positive Connection. Connect a 1µF capacitor (or 2.2µF for CN. Transfer Capacitor Negative Connection. Connect a ...

Page 6

White LED Regulating Charge Pump for Camera Flashes and Movie Lights CP IN 2.7V TO 5.5V LDO/CHARGE PUMP C IN 4.7µF GND V OUT EN1 CONTROL EN2 *2.2µF FOR MORE THAN 600mA OUTPUT. Figure 1. Functional Diagram 6 _______________________________________________________________________________________ ...

Page 7

White LED Regulating Charge Pump for 2. 4.7µF 100%, 33%, 20%, AND SHUTDOWN *1µF FOR LESS THAN 600mA OUTPUT. Figure 2. Current Regulation with the MAX1577Z 2. 4.7µF 5.1V, 4.6V, 3.4V ...

Page 8

White LED Regulating Charge Pump for Camera Flashes and Movie Lights C1 2.2µF* CP 2. 4.7µF GND MAX1577Y 5.1V OR 100% CURRENT, EN1 4.6V OR 33% CURRENT, 3.4V OR 20% CURRENT, EN2 AND SHUTDOWN ...

Page 9

White LED Regulating Charge Pump for Overvoltage Protection Output overvoltage protection (OVP) protects the IC and other components in case the output is open cir- cuit. The MAX1577Z always limits the output voltage to 5.3V. With the MAX1577Y, the ...

Page 10

White LED Regulating Charge Pump for Camera Flashes and Movie Lights (Figure 2), the ballast resistors must be small enough to prevent triggering the overvoltage protection: R < (5. BALLAST F where I is the current through ...

Page 11

... 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 ...

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