TDA7278 Datasheet, PDF (1/15 Pages) STMicroelectronics – HIGH-EFFICIENCY CD ACTUATOR DRIVER

TDA7278
HIGH-EFFICIENCY CD ACTUATOR DRIVER
WIDE OPERATIVE SUPPLY RANGE (1.6 to
5V) LOW VOLTAGE OPERATION CAPABIL-
ITY
4 LOAD DRIVING VOLTAGES PWM REGU-
LATED (STEP DOWN FROM BATTERY)
LOW ON RESISTANCE H BRIDGES
(2 x 1.6Ω MAX + 2 x 2.5Ω MAX) FOR:
– FOCUS AND TRACKING ACTUATORS
– SLEDGE AND SPINDLE MOTORS
SYNCHRONIZABLE SAWTOOTH OSCILLATOR
CONFIGURABLE DC/DC CONVERTER FOR
ADJUSTABLE MAIN POWER SUPPLY, WITH
LOW ON RESISTANCE (0.4Ω MAX) SWITCH
GENERAL ENABLE INPUT
ADJUSTABLE WATCH DOG AND DELAYED
POWER ON RESET FUNCTIONS
PIN CONNECTION
PQFP44
ADJUSTABLE COMPARATORS FOR BAT-
TERY LOW AND BATTERY EMPTY DETEC-
TION
44 43 42 41 40 39 38 37 36 35 34
H IN 2
1
H OUT 2A
2
FLIN 2
3
VBAT
4
FLIN 1
5
GND
6
H OUT 1A
7
H IN 1
8
H OUT 1B
9
OUT
10
VHIGH
11
33
H IN 4
32
H OUT 4A
31
FLIN 4
30
VBAT
29
FLIN 3
28
GND
27
H OUT 3A
26
H IN 3
25
H OUT 3B
24
ENABLE
23
SYNC
12 13 14 15 16 17 18 19 20 21 22
March 1997
D94AU112A
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