Rainbow-electronics MAX781 Manual do Utilizador descarregar pdf (Página 23)

MAX781

PDA/Hand-Held Computer Power Controller

______________________________________________________________________________________ 23

___________________Chip Topography__________________Pin Configuration

AOUT

VPPA

VHI

VPPB

AGND

SYNC

SCLK

DOUT

DIN

INT

GD5 GD3 GD1

AUXIN

GD4

GD2 SHDN

TEMP

FAST

DCHG

DLOCSBAT

COMP

PGND BST

5OUT

0.219"

(5.563mm)

0.152"

(3.861mm)

REF

UVLO

VCHG

BATT

3OUT

DHI

TRANSISTOR COUNT: 2661

SUBSTRATE CONNECTED TO AGND.

GD1

SHDN

AUXIN

TEMP

AOUT

REF

DHI

UVLO

VCHG

BATT

3OUT

INT

DIN

DOUT

SCLK

SYNC

AGND

VPPB

VHI

VPPA

GD5

GD4

GD3

GD2

SSOP

TOP VIEW

MAX781

DCHG

BST

DLO

PGND

5OUT

CSBAT

COMP

FAST

1 2 ... 18 19 20 21 22 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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