MAX8834Y 데이터 시트보기 (PDF) - Maxim Integrated

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MAX8834Y

Adaptive Step-Up Converters with 1.5A Flash Driver

Maxim Integrated 

MAX8834Y/MAX8834Z

Adaptive Step-Up Converters

with 1.5A Flash Driver

PIN

A1, B1

A2, B2

A3, B3

A4

A5

B4

B5

C1

C2, D2

C3

C4

C5

D1

D3

D4

D5

Pin Description

NAME

OUT

LX

PGND

IN

VDD

SCL

AGND

COMP

FGND

LED_EN

GSMB

SDA

FLED2

FLED1

INDLED

NTC

FUNCTION

Regulator Output. Connect OUT to the anodes of the external LEDs. Bypass OUT to PGND with a 10µF

ceramic capacitor. OUT is connected to LX through an internal 10k
resistor during shutdown.

Inductor Connection. Connect LX to the switched side of the inductor. LX is internally connected to

the drains of the internal MOSFETs. LX is connected to OUT through an internal 10k
resistor during

shutdown.

Power Ground. Connect PGND to AGND and to the input capacitor ground. Connect PGND to the PCB

ground plane.

Analog Supply Voltage Input. The input voltage range is 2.5V to 5.5V. Bypass IN to AGND and PGND

with a 10µF ceramic capacitor as close as possible to the IC. IN is high impedance during shutdown.

Logic Input Supply Voltage. Connect VDD to the logic supply driving SCL, SDA, LED_EN, and GSMB.

Bypass VDD to AGND with a 0.1µF ceramic capacitor. When VDD is below the UVLO, the I2C registers

reset and the step-up converter turns off.

I2C Clock Input. Data is read on the rising edge of SCL.

Analog Ground. Connect AGND to PGND and to the input capacitor ground. Connect AGND to the PCB

ground plane.

Compensation Input. See the Compensation Network Selection section for details. COMP is internally

pulled to AGND through a 180
resistor in shutdown.

FLED1/FLED2 and INDLED Power Ground. Connect FGND to PGND.

LED Enable Logic Input. LED_EN controls FLED1, FLED2, and INDLED, depending on control bits

written into the LED_CNTL register. See the LED_EN Control register description for an explanation of

this input function. LED_EN has an internal 800k
pulldown resistor to AGND.

GSM Blank Signal. Assert GSMB to reduce the current regulator settings according to the values

programmed into the GSMB_CUR register. The status of the flash safety timer and the flash/movie

mode values in the current regulator registers are not affected by the GSMB state. Connect GSMB to

the PA module enable signal or other suitable logic signal that indicates a GSM transmit is in

process. Polarity of this signal is set by a bit in the GSMB_CUR register (default is active-high).

GSMB has an internal 800k
pulldown resistor to AGND.

I2C Data Input. Data is read on the rising edge of SCL and data is clocked out on the falling edge of

SCL.

FLED2 Current Regulator. Current flowing into FLED2 is based on the internal I2C registers

FLASH2_CUR and MOVIE_CUR. Connect FLED2 to the cathode of an external flash LED or LED

module. FLED2 is high impedance during shutdown. If unused, connect FLED2 to ground.

FLED1 Current Regulator. Current flowing into FLED1 is based on the internal I2C registers

FLASH1_CUR and MOVIE_CUR. Connect FLED1 to the cathode of an external flash LED or LED

module. FLED1 is high impedance during shutdown. If unused, connect FLED1 to ground.

INDLED Current Regulator. Current flowing into INDLED is based on the internal I2C registers

IND_CUR. Connect INDLED to the cathode of an external indicator LED. INDLED is high impedance

during shutdown. If unused, connect INDLED to ground.

NTC Bias Output. NTC provides 20µA to bias the NTC thermistor. The NTC voltage is compared to the

trip threshold programmed by the NTC_CNTL register. NTC is high impedance during shutdown.

Connect NTC to IN if not used. See the Finger-Burn Protection (NTC) section for details.

Maxim Integrated

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