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PDF ACT8796 Data sheet ( Hoja de datos )
| Número de pieza | ACT8796 | |
| Descripción | Six Channel Integrated Power Management IC | |
| Fabricantes | Active-Semi | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ACT8796 (archivo pdf) en la parte inferior de esta página. Total 34 Páginas | ||
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ACT8796
Rev1, 10-Oct-08
Six Channel Integrated Power Management IC
for Handheld Portable Equipment
FEATURES
• Multiple Patents Pending
• Six Integrated Regulators
− 750mA PWM Step-Down DC/DC
− 750mA PWM Step-Down DC/DC
− 550mA PWM Step-Down DC/DC
− 250mA Low Noise LDO
− 250mA Low Noise LDO
− 250mA Low Noise LDO
• I2CTM Compatible Serial Interface
− Programmable Output Voltages
− Configurable Operating Modes
• Minimal External Components
• 4x4mm, Thin-QFN (TQFN44-24) Package
− Only 0.75mm Height
− RoHS Compliant
APPLICATIONS
• Portable Devices and PDAs
• Wireless Handhelds
• DMB Enabled Devices
• GPS Receivers, etc.
GENERAL DESCRIPTION
The patent-pending ACT8796 is a complete, cost-
effective, highly-efficient ActivePMUTM power man-
agement solution that is ideal for a wide range of
portable handheld equipment. This device inte-
grates three step-down DC/DC converters and
three low dropout linear regulators (LDOs) into a
single, thin, space-saving package. An I2C Serial
Interface provides programmability for the DC/DC
converters and LDOs.
REG1, REG2 and REG3 are fixed-frequency, cur-
rent-mode PWM step-down DC/DC converters that
are optimized for high efficiency and are capable of
supplying up to 750mA, 750mA and 550mA, re-
spectively. REG4, REG5 and REG6 are low noise,
high PSRR linear regulators that are capable of
supplying up to 250mA each.
The ACT8796 is available in a tiny 4mm x 4mm 24-
pin Thin-QFN package that is just 0.75mm thin.
SYSTEM BLOCK DIAGRAM
Battery
nMSTR
nRSTO
PWRHLD
ON3
SCL
SDA
OUT1
1.1V to 4.4V
Up to 750mA
System
Control
REG1
Step-Down
DC/DC
ACT8796
PMUActive
TM
REG2
Step-Down
DC/DC
REG3
Step-Down
DC/DC
REG4
LDO
REG5
LDO
REG6
LDO
Innovative PowerTM
ActivePMUTM is a trademark of Active-Semi.
I2CTM is a trademark of Philips Electronics.
-1-
OUT2
1.1V to 4.4V
Up to 750mA
OUT3
1.1V to 4.4V
Up to 550mA
OUT4
0.645V to 3.7V
Up to 250mA
OUT5
1.4V to 3.7V
Up to 250mA
OUT6
1.4V to 3.7V
Up to 250mA
Pb-free
www.active-semi.com
Copyright © 2008 Active-Semi, Inc.
Free Datasheet http://www.datasheet4u.com/
1 page  
ACT8796
Rev1, 10-Oct-08
ABSOLUTE MAXIMUM RATINGSc
PARAMETER
VP1, VP2, SW1, SW2 to GP12
VP3, SW3 to GP3
SCL, SDA, INL, OUT1, OUT2, OUT3, OUT4, OUT5, OUT6, ON3, REFBP, nRSTO,
PWRHLD, nMSTR to GA
SW1 to VP1
SW2 to VP2
SW3 to VP3
GP12, GP3 to GA
Junction to Ambient Thermal Resistance (θJA)
RMS Power Dissipation (TA = 70°C)
Operating Temperature Range
Junction Temperature
Storage Temperature
Lead Temperature (Soldering, 10 sec)
VALUE
-0.3 to +6
UNIT
V
-6 to +0.3
-0.3 to +0.3
30
1.8
-40 to 85
125
-55 to 150
300
V
V
°C/W
W
°C
°C
°C
°C
c: Do not exceed these limits to prevent damage to the device. Exposure to absolute maximum rating conditions for long periods may
affect device reliability.
Innovative PowerTM
ActivePMUTM is a trademark of Active-Semi.
I2CTM is a trademark of Philips Electronics.
-5-
www.active-semi.com
Copyright © 2008 Active-Semi, Inc.
Free Datasheet http://www.datasheet4u.com/
5 Page 
ACT8796
Rev1, 10-Oct-08
SYSTEM MANAGEMENT
FUNCTIONAL DESCRIPTION (CONT’D)
nMSTR Enable Input
In most applications, connect nMSTR to an active
low, momentary push-button switch to utilize the
ACT8796's closed-loop enable/disable functionality.
If a momentary-on switch is not used, drive nMSTR
to GA or to a logic low to initiate a startup se-
quence.
Enable/Disable Inputs
The ACT8796 provides two manual enable/disable
inputs, PWRHLD and ON3. PWRHLD is the master
enable input. When driven high, PWRHLD enables
REG1, REG2, and REG4, and also activates the
enable/disable control logic for the other regulators.
ON3 is the enable input for REG3, and is active
when either of the following conditions exists:
1) nMSTR is asserted low, or
2) PWRHLD is asserted high.
Power-On Reset Output
The ACT8796 integrates a 260ms power-on reset
generator, reducing system size and cost. nRSTO
is an open-drain output. Connect a 10kΩ or greater
pull-up resistor from nRSTO to an appropriate volt-
age supply. nRSTO asserts low upon startup and
remains low until the reset-timeout period expires,
at which point nRSTO goes high-Z.
nIRQ Output
Figure 2 shows two simple circuits that can be used
to generate nIRQ, a processor interrupt signal,
which can be used as part of the ACT8796’s push-
button control logic. This signal is typically used to
drive the interrupt input of the system processor,
and is useful in a variety of software-controlled en-
able/disable control routines. Figure 2A provides an
active-low, open-collector push-button status output
that sinks current when nMSTR is driven to a logic-
low. Figure 2B provides an active-high, open-
collector push-button status output that sources
current when nMSTR is driven to a logic-low.
Thermal Shutdown
The ACT8796 integrates thermal shutdown protec-
tion circuitry to prevent damage resulting from ex-
cessive thermal stress, as may be encountered un-
der fault conditions. This circuitry disables all regu-
lators if the ACT8796 die temperature exceeds
160°C, and prevents the regulators from being en-
abled until the IC temperature drops by 20°C (typ).
Figure 2:
Simple Circuits
VCC OUT2
INL
100k 100k
500k
CPU
nIRQ
PB
ACT8796
nMSTR
ACT8796
PB OUT2
100k
VCC
nIRQ
100k
(A) (B)
Innovative PowerTM
ActivePMUTM is a trademark of Active-Semi.
I2CTM is a trademark of Philips Electronics.
- 11 -
www.active-semi.com
Copyright © 2008 Active-Semi, Inc.
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 34 Páginas | |
| PDF Descargar | [ Datasheet ACT8796.PDF ] | |
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