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PDF MAX8607 Data sheet ( Hoja de datos )
| Número de pieza | MAX8607 | |
| Descripción | 1MHz PWM Boost Converter | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-3783; Rev 1; 2/07
EVAALVUAAILTAIOBNLEKIT
1MHz PWM Boost Converter for 1.5A
White LED Camera Flash
General Description
The MAX8607 white LED boost converter is optimized
for camera flash/strobe applications using high-current
white LEDs. The MAX8607 integrates a 1MHz PWM
boost converter, 1.5A low-dropout (LDO) current regu-
lator, and logic control circuitry for a space-saving LED
flash design. Two logic inputs control four modes of
operation: shutdown mode reduces the quiescent cur-
rent to 0.1µA (typ), movie mode supplies up to 360mA
of LED current for continuous lighting, flash mode sup-
plies up to 1.5A of LED current for short-duration light-
ing during an exposure, and disco mode supplies +5V
(at up to 1A) to external circuits while driving the LED
with a fixed 80mA current.
The internal 1MHz boost converter features an adaptive
control scheme with an internal switching MOSFET and
synchronous rectifier to improve efficiency and mini-
mize external component count. The MAX8607 is avail-
able in a 14-pin, 3mm x 3mm TDFN package (0.8mm
max height).
www.DataSheet4U.com
Applications
Camera Flashes/Strobes
Cell Phones/Smartphones
PDAs and Digital Cameras
Pin Configuration
Features
♦ Supports Lumileds and Other High-Power
White LEDs
♦ Independently Set Flash/Movie Currents
Flash-Mode Current Up to 1.5A
Movie-Mode Current Up to 360mA
♦ Disco Mode with Fixed 5V (Up to 1A) and 80mA
LED Current
♦ 84% Efficiency (PLED / PBATT) at 1.1A
♦ TA Derating Function for LED Thermal Protection
♦ Output Overvoltage Protection (OVP)
♦ Soft-Start Eliminates Inrush Current
♦ 1MHz PWM Operation at All Loads
♦ Small External Components
♦ 2.7V to 5.5V Input Voltage Range
♦ 0.1µA Shutdown Mode
♦ 14-Pin, 3mm x 3mm TDFN Package
Ordering Information
PART*
PIN-PACKAGE
TOP MARK
MAX8607ETD+
14 TDFN 3mm x 3mm
(T1433-1)
ABA
+Indicates lead-free package.
*The MAX8607ETD is characterized over the -40°C to +85°C
temperature range.
Typical Operating Circuit
TOP VIEW
14 13 12 11 10 9 8
MAX8607
+
1234567
TDFN
3mm x 3mm
INPUT
2.7V TO 5.5V 2.2µH
10µF
MODE-
SELECT
INPUTS
LX MAX8607 OUT
PGND
OUTS
LGND
COMP
GND
OUTPUT
10µF
UP TO 1.5A FLASH
UP TO 360mA MOVIE
EN1
EN2
FLSH
LED
MOV
________________________________________________________________ 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  
1MHz PWM Boost Converter for 1.5A
White LED Camera Flash
Typical Operating Characteristics (continued)
(Circuit of Figure 2, VIN = VEN1 = 3.6V, VEN2 = 0V, TA = +25°C, unless otherwise noted.)
400
350
300
250
200
150
100
50
0
1
MOVIE-MODE LED CURRENT
vs. MOV RESISTANCE
10
RMOV (kΩ)
100
1600
1400
1200
1000
800
600
400
200
0
1
FLASH-MODE LED CURRENT
vs. FLSH RESISTANCE
10
RFLSH (kΩ)
100
PIN
1
2
3
4
5
6
7
8
9, 10
11, 12
13
14
—
Pin Description
NAME
COMP
EN1
EN2
MOV
FLSH
GND
LGND
LED
PGND
LX
OUT
OUTS
EP
FUNCTION
Compensation Input. Connect a 0.1µF ceramic capacitor from COMP to GND for regulator stability.
Enable Input 1. EN1 and EN2 set the operating mode (see Table 1).
Enable Input 2. EN1 and EN2 set the operating mode (see Table 1).
Movie Current Program Input. Connect a resistor from MOV to GND to set the LED current in movie mode.
RMOV must be greater than 2kΩ.
Flash Current Program Input. Connect a resistor from FLSH to GND to set the LED current in flash mode.
RFLSH must be greater than 2kΩ.
Analog Ground. Connect GND to the exposed paddle directly under the IC.
LED Current Regulator Ground. Connect LGND to the ground plane on the PC board.
LED Current Regulator. Connect LED to the cathode of the external LED. LED is high impedance during shutdown.
Power Ground. Connect PGND to the input capacitor ground. Also, connect PGND to the PC board ground plane.
Inductor Connection. Connect LX to the switched side of the inductor. LX is internally connected to the
drains of the internal MOSFETs. Both MOSFETs are off during shutdown.
Regulator Output. Connect OUT to the anode of the external LED. Bypass OUT to PGND with a 10µF or
larger ceramic capacitor. During shutdown, OUT is one body-diode drop below the input voltage.
Output Sense and IC Supply Input. Connect OUTS to OUT at the output bypass capacitor. The IC’s operating
power is supplied from OUTS.
Exposed Paddle. Connect the exposed paddle to GND directly under the IC and to a large PC board
ground plane for increased thermal performance.
_______________________________________________________________________________________ 5
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| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet MAX8607.PDF ] | |
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