MAX8858 [MAXIM]

Highly Efficient, All-Internal MOSFET, 6-Channel PMIC for 2AA Digital Camera Systems; 高效，内置MOSFET ， 6通道PMIC为2AA数码相机系统


型号：	MAX8858
厂家：	MAXIM INTEGRATED PRODUCTS
描述：	Highly Efficient, All-Internal MOSFET, 6-Channel PMIC for 2AA Digital Camera Systems 高效，内置MOSFET ， 6通道PMIC为2AA数码相机系统集成电源管理电路数码相机
文件：	总2页 (文件大小：118K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

19-4102; Rev 0; 5/08

ABRIDGED

Highly Efficient, All-Internal MOSFET, 6-Channel

PMIC for 2AA Digital Camera Systems

MAX58

General Description

Features

The MAX8858 PMIC provides a complete power-supply

solution for digital still cameras (DSCs) and digital video

cameras (DVCs). The MAX8858 improves performance,

component count, and board space utilization compared

to currently available solutions for two AA cell and dual-

battery designs. On-chip power MOSFETs provide up to

95% efficiency for critical power supplies. The CCD

inverter can operate directly from two AA/NiMH batteries

without the use of any additional external components.

♦ 95% Efficient Synchronous-Rectified DC-DC

Converters

♦ Up to 90% Efficient Boost-Buck Operation

♦ Up to 85% Efficient, High-Voltage DC-DC

Converters

♦ Transformerless Inverting Converter with Active

Discharge for CCD

♦ Preset Power-Up Sequencing for MAIN, SDZ, and

•

Step-up synchronous-rectified DC-DC converter

(SU). The MAX8858 is bootstrapped from V

SD Converters

VSU

♦ Inverter Operates Directly from Two AA Batteries

♦ Internal Compensation on All Channels

♦ True Shutdown™ on All Step-Up Converters

♦ Overload Protection

MAIN synchronous-rectified step-up DC-DC converter

(M) with active discharge for DSP I/O supply voltage.

SDZ synchronous-rectified step-down DC-DC con-

verter (SDZ) with active discharge for DSP DDR

supply voltage.

♦ Startup into Short Protection

•

Low-voltage (down to 1V) synchronous-rectified

step-down DC-DC converter (SD) with active dis-

charge for DSP core supply voltage.

♦ Soft-Start for Controlled Inrush Current

♦ 100% Duty Cycle on Step-Down Converters

♦ 2MHz 5% Switching ꢀrequency

•

High-voltage step-up DC-DC converter (CCDBST)

for CCD imagers or positive LCD bias supplies.

♦ 0.1µA Shutdown Supply Current

♦ All Internal Power MOSꢀETs

Transformerless inverting DC-DC converter (CCDINV)

with active discharge for CCD imagers or negative

LCD bias supplies. This converter can connect

directly to two AA batteries.

Ordering Information

PART

TEMP RANGE

PIN-PACKAGE

Individual ON_ inputs provide independent on/off control

for the SU, CCDBST, and CCDINV converters, while dual-

function inputs allow independent on/off control or power-

up sequencing of the MAIN, SDZ, and SD converters.

MAX8858ETJ+

-40°C to +85°C

32 Thin QFN-EP*

+Denotes a lead-free package.

*EP = Exposed pad.

The MAX8858 is available in a 5mm x 5mm x 0.8mm,

32-pin thin QFN package and operates over the -40°C

to +85°C extended temperature range.

Pin Configuration

Applications

TOP VIEW

DSCs and DVCs

24 23 22 21 20 19 18 17

PDAs and Portable Media Players

LXSU 25

LXSU 26

LXBST

SWBST

Typical Operating Circuit

14 PVBST

PVSU

PVSD

LXSD

PVM

LXM

PVINV

INPUT

MAX8858

0.9V TO 5.5V

OUTINV

SU STEP-UP

PVBST

11 LXINV

10 PVZ

MAIN STEP-UP

3.3V

MAIN

ONSU

EP = EXPOSED PAD

SD STEP-DOWN

SDZ STEP-DOWN

1.8V

ONM/SEQ

LXZ

LXM

2.5V

SDZ

ONSD/EN1

ONZ/EN2

MAX8858

THIN QꢀN-EP

5mm x 5mm

+15V

-7.5V

CCDBST

CCDINV

CCDBST

ONBST

ONINV

CCDINV

True Shutdown is a trademark of Maxim Integrated Products, Inc.

________________________________________________________________ Maxim Integrated Products

ꢀor pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

ABRIDGED

Highly Efficient, All-Internal MOSFET, 6-Channel

PMIC for 2AA Digital Camera Systems

BATT

R13

100Ω

C16

1μF

REF

PVINV

REF

C18

0.22μF

CCDINV

OUTINV

(-7.5V, 100mA)

LXINV

MAX58

4.7μH

2μH

C17

4.7μF

BATT

R11

604kΩ

(1.8V TO 5.5V)

25, 26

LXSU

22μF

FBINV

SWBST

R12

100kΩ

(5V, 500mA)

PVSU

22μF

2.2μH

REF

MAX8858

CCDBST

(15V, 30mA)

LXBST

FBBST

402kΩ

C15

2.2μF

1.4MΩ

FBSU

R10

100kΩ

C14

1μF

BATT

1μF

PVBST

31, 32

LXM

PVM

C11

1μF

1μH

MAIN

PVZ

LXZ

(3.3V, 300mA)

4.7μH

SDZ

22μF

(2.5V, 200mA)

23.2kΩ

C12

C13

10μF

150kΩ

10μF

FBM

10kΩ

4, 20

GND

BATT

10μF

FBZ

PVSD

LXSD

100kΩ

4.7μH

(1.8V, 250mA)

ONSU

ONM/SEQ

ONSD/EN1

ONZ/EN2

10μF

C10

10μF

80kΩ

FBSD

100kΩ

ONBST

ONINV

Figure 1. MAX8858 Typical Application Circuit

16 ______________________________________________________________________________________

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