http://www.datasheet4u.com

900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf




Maxim Integrated Semiconductor Electronic Components Datasheet

MAX8901A Datasheet

Highest Efficiency Supply

No Preview Available !

MAX8901A pdf
19-0865; Rev 0; 8/07
EVAALVUAAILTAIOBNLEKIT
Highest Efficiency Supply for 2 to 6
Series WLEDs in a 2mm x 2mm TDFN Package
www.datasheet4u.com
General Description
The MAX8901A/MAX8901B step-up converters drive from
two to six series-connected white LEDs (WLEDs) with
constant current to provide uniform WLED intensity for
LCD backlighting in cell phones, PDAs, and other hand-
held devices. The MAX8901_ operate at a fixed 750kHz
(typ) switching frequency, allowing for tiny external com-
ponents, and are optimized for the highest possible effi-
ciency over the full 1-cell Li+/Li-Poly battery range.
These converters use a single input (ON) to enable the
IC and to control WLED intensity. The MAX8901A
requires a direct PWM input to regulate WLED intensity
with the WLED current proportional to the PWM duty
cycle. The MAX8901B uses single-wire, serial-pulse
dimming that reduces the WLED intensity in 32 linear
steps. Full-scale WLED current for serial-pulse
dimming is 24.75mA (MAX8901B, 0.75mA/step).
The MAX8901_ features an internal soft-start to eliminate
inrush currents during startup, input overvoltage
protection, WLED overvoltage protection, and a shut-
down mode with 0.01µA (typ) shutdown current. No
WLED current is present in shutdown provided the
WLED forward voltage is greater than the input supply
voltage. Additional features include undervoltage lock-
out (UVLO) and thermal shutdown.
The MAX8901_ are available in tiny 8-pin, 2mm x 2mm
TDFN-EP packages (0.8mm max height).
Applications
Display Backlight (from 2 to 6 WLEDs)
Cellular Phones
PDAs and Smartphones
MP3 and Portable Media Players
Portable Navigation Devices
Digital Cameras
INPUT
2.6V TO 5.5V
PWM DIMMING
CONTROL
3
IN
LX 4
7 MAX8901A
COMP
1
OVP
6
GND
5
PGND
2 ON
8
EP CS
OUTPUT
UP TO 25V
Features
High Efficiency, Up to 91%
2.6V to 5.5V Input Voltage Range
Fixed-Frequency Operation
Supplies from 2 to 6 WLEDs with 1% LED Current
Accuracy
Flexible Dimming Control
Direct PWM Dimming (MAX8901A)
32-Step, 1-Wire Serial Dimming
(MAX8901B)
Input Undervoltage Lockout
Input Overvoltage Lockout
WLED Overvoltage Protection (25V typ)
0.01µA (typ) Shutdown Current
No WLED Current in Shutdown
Internal Soft-Start and Thermal Shutdown
Ordering Information
PART
PIN-PACKAGE PKG
CODE
TOP
MARK
MAX8901AETA+T
8 TDFN-EP*
2mm x 2mm
T822-1 +ABA
MAX8901BETA+T
8 TDFN-EP*
2mm x 2mm
T822-1 +ABB
Note: All devices are specified over the -40°C to +85°C operating
temperature range.
+Denotes a lead-free package.
*EP = Exposed paddle.
T = Tape and reel.
Pin Configuration appears at end of data sheet.
Typical Operating Circuits
INPUT
2.6V TO 5.5V
SERIAL-PULSE
DIMMING
CONTROL
3
IN
LX 4
MAX8901B
7
COMP
1
OVP
6
GND
5
PGND
2 ON
EP CS 8
OUTPUT
UP TO 25V
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim's website at www.maxim-ic.com.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX8901A Datasheet

Highest Efficiency Supply

No Preview Available !

MAX8901A pdf
Highest Efficiency Supply for 2 to 6
Series WLEDs in a 2mm x 2mm TDFN Package
www.daAtasBheSeOt4uL.cUomTE MAXIMUM RATINGS
IN to GND .................................................................-0.3V to +7V
CS, COMP, ON to GND ...............................-0.3V to (VIN + 0.3V)
OVP, LX to GND .....................................................-0.3V to +28V
PGND to GND .......................................................-0.3V to +0.3V
LX Current ..................................................................770mARMS
Continuous Power Dissipation (multilayer board at +70°C)
8-pin, 2mm x 2mm TDFN
(derate above +70°C by 11.9mW/°C) ..........................953mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VIN = VON = VOVP = 3.6V, VPGND = VGND = 0V, COMP, CS, and LX are unconnected, TA = -40°C to +85°C, unless otherwise noted.
Typical values are at TA = +25°C.) (Note 1)
PARAMETER
Input Voltage
SYMBOL
VIN
CONDITIONS
MIN TYP MAX UNITS
2.6 5.5 V
Input Undervoltage Lockout
Threshold
Input Overvoltage Lockout
Threshold
Shutdown Input Current
Quiescent Current
Output Voltage Range
OVP Overvoltage Protection
Threshold
OVP Input Current
CS Regulation Voltage
ON Shutdown Delay
ON High Voltage
ON Low Voltage
ON Input Current
Initial ON High Pulse Width
ON High Pulse Width
ON Low Pulse Width
VIN_UVLO
VIN_OVLO
VIN rising
VIN falling
VIN rising
VIN falling
ISHDN VON = 0V
VCS = 0.55V, no
IQ load (not
switching)
TA = +25°C
TA = +85°C
MAX8901A
MAX8901B
2.25
2.20
6.2
6.0
VOUT
VDIODE = external boost diode voltage drop
VIN -
VDIODE
VOV 6 LEDs with 25V OVP option
24
IOV
VCS
tSHDN
VON_HI
VON_LO
ION
tHI_INIT
tHI
tLO
VOVP = 20V
No dimming
Time VON is below low threshold until
shutdown (Figure 1)
2.6V < VIN < 5.5V
2.6V < VIN < 5.5V
ON = IN
TA = +25°C
TA = +85°C
First ON high pulse to enable IC
(MAX8901B) (Figure 1)
MAX8901B (Figure 1)
MAX8901B (Figure 1)
0.475
1.18
1.3
40
0.5
0.5
0.01
0.1
70
115
25
20
0.50
1.33
0.01
0.1
2.50
2.53
6.3
6.3
1
135
185
VOV
26
0.525
1.50
0.4
1
500.0
V
V
µA
µA
V
V
µA
V
ms
V
V
µA
µs
µs
µs
2 _______________________________________________________________________________________


Part Number MAX8901A
Description Highest Efficiency Supply
Maker Maxim Integrated Products
Total Page 15 Pages
PDF Download
MAX8901A pdf
MAX8901A Datasheet PDF
[partsNo] view html
View PDF for Mobile








Similar Datasheet

1 MAX8901A Highest Efficiency Supply Maxim Integrated Products
Maxim Integrated Products
MAX8901A pdf
2 MAX8901B Highest Efficiency Supply Maxim Integrated Products
Maxim Integrated Products
MAX8901B pdf





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z

Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy