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PDF ACT8798 Data sheet ( Hoja de datos )
| Número de pieza | ACT8798 | |
| 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 ACT8798 (archivo pdf) en la parte inferior de esta página. Total 34 Páginas | ||
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ACT8798
Rev 1, 16-Nov-09
Six Channel Integrated Power Management IC
for Handheld Portable Equipment
FEATURES
• Multiple Patents Pending
• Six Integrated Regulators
− 1.2A PWM Step-Down DC/DC
− 1.2A PWM Step-Down DC/DC
− 750mA 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 ACT8798 is a complete, cost-
effective, highly-efficient ActivePMUTM power
management solution that is ideal for a wide range
of portable handheld equipment. This device
integrates 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,
current-mode PWM step-down DC/DC converters
that are optimized for high efficiency and are
capable of supplying up to 1.2A, 1.2A and 750mA,
respectively. REG4, REG5 and REG6 are low
noise, high PSRR linear regulators that are capable
of supplying up to 250mA each.
The ACT8798 is available in a tiny 4mm × 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 1.2A
System
Control
REG1
Step-Down
DC/DC
ACT8798
ActivePMU 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 1.2A
OUT3
1.1V to 4.4V
Up to 750mA
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 © 2009 Active-Semi, Inc.
Free Datasheet http://www.datasheet4u.com/
1 page  
Active-Semi
ACT8798
Rev 1, 16-Nov-09
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
UNIT
-0.3 to +6
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 © 2009 Active-Semi, Inc.
Free Datasheet http://www.datasheet4u.com/
5 Page 
Active-Semi
ACT8798
Rev 1, 16-Nov-09
SYSTEM MANAGEMENT
FUNCTIONAL DESCRIPTION (CONT’D)
ACT8798'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
sequence.
Enable/Disable Inputs
The ACT8798 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 ACT8798 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
voltage 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 ACT8798’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
enable/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 ACT8798 integrates thermal shutdown
protection circuitry to prevent damage resulting from
excessive thermal stress, as may be encountered
under fault conditions. This circuitry disables all
regulators if the ACT8798 die temperature exceeds
160°C, and prevents the regulators from being
enabled until the IC temperature drops by 20°C
(typ).
Figure 2:
Simple Circuits
VCC OUT2
INL
100k 100k
500k
CPU
nIRQ
PB
ACT8798
nMSTR
ACT8798
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 © 2009 Active-Semi, Inc.
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 34 Páginas | |
| PDF Descargar | [ Datasheet ACT8798.PDF ] | |
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