Rainbow-electronics MAX781 Manual de usuario descargar pdf (Pagina 9)

VPP LINEAR

REGULATORS

BIAS

GEN

+3.3V LINEAR 

REGULATOR

VCHG

BATT

UVLO

SHDN

AGND

SCLK

DIN

AUXIN

AOUT

TEMP

2.5V

REFERENCE

+3.3V SWITCHING

REGULATOR

SERIAL INTERFACE

AVPP1

IDLE

MODE0

MODE1

50N

AVPP0

BVPP0

BVPP1

BATTSTAT

MUX_

MUXON

GDSEL_

GDON

CHG_

CHGON

BST

CS3

3OUT

REF

DHI

DLO

PGND

SYNC

VHI

VPPA

VPPB

INT

DOUT

FAST

DCHG

COMP

CSBAT

INREG

CHGSTAT

UNDERVOLTAGE

3VSTAT

+5V LINEAR 

REGULATOR

GATE

DRIVERS

BATTERY

CHARGER

ANALOG

MULTIPLEXER

MAX781

PDA/Hand-Held Computer Power Controller

_______________________________________________________________________________________ 9

Figure 2. MAX781 Block Diagram

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 23 24

EVALUATION KIT 1
AVAILABLE 1
ABSOLUTE MAXIMUM RATINGS 2
ELECTRICAL CHARACTERISTICS 2
ANALOG MULTIPLEXER 4
NO LOAD SUPPLY CURRENT 5
CHARGER OUTPUT CURRENT 5
SYNC = AGND, NO 3OUT LOAD 6
T1 TURNS RATIO (SECONDARY 6
TURNS / PRIMARY TURNS) = 3.5 6
VARIABLE SWITCHING FREQUENCY 7
Table 2. Operating Modes 10
• • • 12
Supply and Reference 13
3.3V Output 13
VPP Regulator 14
Analog Multiplexer 15
Gate Drivers 15
Battery Charger 15
Design Example 17
Specifications 18
Table 10. Component Suppliers 19
Interfacing the MAX781 to an 21
IBM Compatible PC 21
TOP VIEW 23
21-0032A 24

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Rainbow-electronics MAX781 Manual de usuario Pagina 9

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