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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX8834Z Datasheet

Adaptive Step-Up Converters

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MAX8834Z pdf
19-4421; Rev 0; 4/09
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EVAALVUAAILTAIOBNLEKIT
Adaptive Step-Up Converters
with 1.5A Flash Driver
General Description
The MAX8834Y/MAX8834Z flash drivers integrate a
1.5A PWM DC-DC step-up converter and three pro-
grammable low-side, low-dropout LED current regula-
tors. The step-up converter features an internal
switching MOSFET and synchronous rectifier to
improve efficiency and minimize external component
count. An I2C interface provides flexible control of step-
up converter output voltage setting, movie/flash mode
selection, flash timer duration settings, and current reg-
ulator settings. The MAX8834Y/MAX8834Z operate
down to 2.5V, making them future proof for new battery
technologies.
The MAX8834Y/MAX8834Z consist of two current regula-
tors for the flash/movie mode. Each current regulator can
sink 750mA in flash mode and 125mA in movie mode.
The MAX8834Y/MAX8834Z also integrate a 16mA low-
current regulator that can be used to indicate camera
status. The indicator current regulator includes program-
mable ramp and blink timer settings. A programmable
input current limit, invoked using the GSMB control,
reduces the total current drawn from the battery during
PA transmit events. This ensures the flash current is set
to the maximum possible for any given operating condi-
tion. Additionally, the MAX8834Y/MAX8834Z include a
MAXFLASH* function that adaptively reduces flash cur-
rent during low battery conditions to help prevent system
undervoltage lockup.
Other features include an optional NTC input for finger-
burn protection and open/short LED detection. The
MAX8834Y switches at 2MHz, providing best overall
efficiency. The MAX8834Z switches at 4MHz, providing
smallest overall solution size. The MAX8834Y/
MAX8834Z are available in a 20-bump, 0.5mm pitch
WLP package (2.5mm x 2.0mm).
*Patent pending.
Ordering Information
PART
TEMP
PIN-PACKAGE
SWITCHING
FREQUENCY
RANGE
(MHz)
MAX8834YEWP+T -40°C to 20 WLP
+85°C (2.5mm x 2.0mm)
MAX8834ZEWP+T
-40°C to
+85°C
20 WLP
(2.5mm x 2.0mm)
2
4
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Pin Configuration appears at end of data sheet.
Features
2.5V to 5.5V Operation Range
Step-Up DC-DC Converter
1.5A Guaranteed Output Current
Adaptive or I2C Programmable Output Voltage
2MHz and 4MHz Switching Frequency Options
Two Flash/Movie LED Current Regulators
I2C Programmable Flash and Movie Current
Low-Dropout Voltage (110mV max) at 500mA
LED Indicator Current Regulator
I2C Programmable Output Current
Ramp and Blink Timers for Indicator Mode
Low-Dropout Voltage (130mV max) at 16mA
I2C Programmable Safety and Watchdog Timers
GSM Blank Logic Input
MAXFLASH System Lockup Protection
Remote Temperature Sensor Input
Open/Short LED Detection
Thermal Shutdown Protection
< 1µA Shutdown Current
20-Bump, 0.5mm Pitch, 2.5mm x 2.0mm WLP
Applications
Cell Phones and Smart Phones
PDAs, Digital Cameras, and Camcorders
Typical Operating Circuit
INPUT
2.5V TO 5.5V
10μF
1μH OR 2.2μH
LX
IN
AGND
PGND
COMP
MAX8834Y
MAX8834Z
PROGRAMMABLE
OUTPUT
3.7V TO 5.2V
OUT
10μF
FLED1
FLED2
1.5A TOTAL
FLASH
PA_TXON
FLASH ON
I2C
VLOGIC
0.1μF
GSMB
LED_EN
SCL
SDA
VDD
INDLED
FGND
16mA INDICATOR
NTC
FINGER-BURN
PROTECTION
________________________________________________________________ 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

MAX8834Z Datasheet

Adaptive Step-Up Converters

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MAX8834Z pdf
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Adaptive Step-Up Converters
with 1.5A Flash Driver
ABSOLUTE MAXIMUM RATINGS
IN, OUT, NTC to AGND .........................................-0.3V to +6.0V
VDD to AGND.........................................................-0.3V to +4.0V
SCL, SDA, LED_EN, GSMB to AGND ........-0.3V to (VDD + 0.3V)
FLED1, FLED2, INDLED to FGND ............-0.3V to (VOUT + 0.3V)
COMP to AGND ...........................................-0.3V to (VIN + 0.3V)
PGND, FGND to AGND .........................................-0.3V to +0.3V
ILX Current (rms) ......................................................................3A
Continuous Power Dissipation (TA = +70°C)
(derate 17.5mW/°C above +70°C) .............................1410mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Bump Temperature* (soldering) ......................................+260°C
*This device is constructed using a unique set of packaging techniques that impose a limit on the thermal profile the device can be exposed to during board
level solder attach and rework. This limit permits only the use of the solder profiles recommended in the industry-standard specification, JEDEC 020A, para-
graph 7.6, Table 3 for IR/VPR and Convection reflow. Preheating is required. Hand or wave soldering is not allowed.
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 = 3.6V, VAGND = VPGND = VFGND = 0V, VDD = 1.8V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at
TA = +25°C.) (Note 1)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
IN Operating Voltage
VDD Operating Range
2.5 5.5 V
1.62 3.6 V
VDD Undervoltage Lockout
(UVLO) Threshold
VDD falling
1.25 1.4 1.55
V
VDD UVLO Hysteresis
IN UVLO Threshold
IN UVLO Hysteresis
VIN falling
50 mV
2.15 2.3 2.45
V
50 mV
IN Standby Supply Current
VSCL = VSDA = VDD, VIN = 5.5V, I2C ready
1 μA
VDD Standby Supply Current
(All Outputs Off, I2C Enabled)
VSCL = VSDA = VDD = 3.6V, I2C ready
4 7 μA
LOGIC INTERFACE
Logic Input-High Voltage
Logic Input-Low Voltage
VDD = 1.62V to 3.6V
VDD = 1.62V to 3.6V
LED_EN, GSMB
SCL, SDA
LED_EN, GSMB
SCL, SDA
1.4
0.7 x
VDD
0.4
0.3 x
VDD
V
V
LED_EN Minimum High Time
(LED_EN is Internally Sampled
by a 1MHz Clock)
1 μs
LED_EN Propagation Delay
From LED_EN going high to rising edge on current
regulator
3 μs
LED_EN and GSMB Pulldown
Resistor
Logic Input Current (SCL, SDA)
VIL = 0V or VIH = 3.6V
TA = +25°C
TA = +85°C
400 800 1600 k
-1
0.01
+1
0.1
μA
2 _______________________________________________________________________________________


Part Number MAX8834Z
Description Adaptive Step-Up Converters
Maker Maxim Integrated Products
Total Page 30 Pages
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