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PDF ACT8740 Data sheet ( Hoja de datos )
| Número de pieza | ACT8740 | |
| Descripción | Six Channel Integrated Power Management IC | |
| Fabricantes | Active-Semi | |
| Logotipo |  |
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ACT8740
Rev PrB, 25-Feb-08
Advanced Product Information―All Information Subject to Change
Six Channel Integrated Power Management IC
for Handheld Portable Equipment
FEATURES
• Multiple Patents Pending
• Li+ Battery Charger with Integrated MOSFET
− Programmable Charge Current up to 1A
− ON/OFF Control
• Five Integrated Regulators
− 350mA PWM Step-Down DC/DC
− Step-Up DC/DC with OVP for WLED Bias
− 350mA 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 ACT8740 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 integrates
one PWM step-down DC/DC converter, one PWM
step-up DC/DC converter with over-voltage protec-
tion (OVP), three low dropout linear regulators
(LDOs) and a full-featured linear-mode Li+ battery
charger into a single, thin, space-saving package.
An I2C Serial Interface provides programmability for
the DC/DC converters, LDOs and battery charger.
REG1 is a fixed-frequency, current-mode PWM step
-down DC/DC converter that is optimized for high
efficiency and is capable of supplying up to 350mA
output current. REG2 is a fixed-frequency, step-up
DC/DC converter that safely and efficiently biases a
string of up to seven white-LEDs for backlighting.
REG3, REG4, and REG5 are low noise, high PSRR
linear regulators that are capable of supplying up to
350mA, 250mA, and 250mA, respectively. The bat-
tery charger incorporates an internal power MOS-
FET for constant-current/constant-voltage, thermally
regulated charging of a single-cell Li+ battery. All
DC/DC converters and LDOs output voltages are
programmable and controllable via the I2C interface.
The ACT8740 is available in a tiny 4mm x 4mm
24-pin Thin-QFN package that is just 0.75mm thin.
SYSTEM BLOCK DIAGRAM
VIN
CHGLEV
Single-Cell Li+
Battery Charger
nMSTR
nIRQ
SCL
SDA
ON1
System Control
ACT8740
PMUActive
TM
REG1
Step-Down
DC/DC
REG2
Step-Up
DC/DC
REG3
LDO
REG4
LDO
REG5
LDO
Innovative Products. Active Solutions.
ActivePMUTM is a trademark of Active-Semi.
I2CTM is a trademark of Philips Electronics.
-1-
Battery
Programmable
Up to 1A
OUT1
1.1V to 4.4V
Up to 350mA
OUT2
WLED Bias
OUT3
1.4 to 3.7V
Up to 350mA
OUT4
1.4 to 3.7V
Up to 250mA
OUT5
1.4 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  
ACT8740
Rev PrB, 25-Feb-08
PIN DESCRIPTIONS
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14,17
15
16
NAME
VIN
SCL
SDA
nIRQ
nMSTR
OUT3
INL
OUT5
OUT4
GP1
SW1
VP1
OUT1
GA
ON1
VSYS
DESCRIPTION
Power Input for the Battery Charger. The Battery Charger, REG1 and REG3 are automatically
enabled whenever a valid voltage is present on VIN. Bypass to GA with a high quality ceramic
capacitor placed as close as possible to the IC.
Clock Input for I2C Serial Interface. Data is read on the rising edge of the clock.
Data Input for I2C Serial Interface. Data is read on the rising edge of the clock.
Open-Drain Push-Button Status Output. nIRQ is an open-drain output which sinks current when
nMSTR is asserted or when a fault-condition occurs. If interrupts are not masked.
Master Enable Input. Drive nMSTR to GA or to a logic low to enable the IC.
Output voltage for REG3. Capable of delivering up to 350mA of output current. Output has high
impedance when disabled.
Power input for REG3, REG4 and REG5. Bypass to GA with a high quality ceramic capacitor
placed as close as possible to the IC.
Output voltage for REG5. Capable of delivering up to 250mA of output current. Output has high
impedance when disabled.
Output voltage for REG4. Capable of delivering up to 250mA of output current. Output has high
impedance when disabled.
Power Ground for REG1. Connect GA, GP1 and GP2 together at a single point as close to the
IC as possible.
Switching Node Output for REG1. Connect this pin to the switching end of the inductor.
Power Input for REG1. Bypass to GP1 with a high quality ceramic capacitor placed as close as
possible to the IC.
Output Feedback Sense for REG1. Connect this pin directly to the output node to connect the
internal feedback network to the output voltage.
Analog Ground. Connect GA directly to a quiet ground node. Connect GA, GP1 and GP2 to-
gether at a single point as close to the IC as possible.
Enable Control Input for REG1 and REG3. Drive ON1 to VSYS or to a logic high for normal
operation, drive to GA or a logic low to disable REG1 and REG3.
Power Bypass for System Management Circuitry. Bypass to GA with a high quality ceramic
capacitor placed as close as possible to the IC. VSYS is internally connected to the higher volt-
age of either VVIN or VBAT. Do not load VSYS with more than 100µA.
Innovative Products. Active Solutions.
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 
ACT8740
Rev PrB, 25-Feb-08
SYSTEM MANAGEMENT
TYPICAL PERFORMANCE CHARACTERISTICS
(VVSYS = 3.6V, TA = 25°C, unless otherwise specified.)
Oscillator Frequency vs. Temperature
1.71
1.68
1.65
1.62
1.59
1.56
1.53
1.50
-40
-20 0
20 40
Temperature (°C)
60
85
VSYS Current vs. Temperature
3
ON1 = GA
VVSYS = 4.2V
2
VVSYS = 3.6V
1 VVSYS = 3.2V
0
-40 -20 0
20 40 60
Temperature (°C)
85
Startup Sequence
CH1
CH2
CH3
CH4
CH1: VnMSTR, 5V/div
CH2: Power-On Reset
(External Signal), 2V/div
CH3: VON1, 5V/div
CH4: VOUT1, 2V/div
TIME: 100ms/div
Startup Sequence
CH1
CH2
CH3
CH4
CH1: VnMSTR, 5V/div
CH2: Power-On Reset
(External Signal), 2V/div
CH3: VON1, 5V/div
CH4: VOUT1, 2V/div
TIME: 100ms/div
Innovative Products. Active Solutions.
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 40 Páginas | |
| PDF Descargar | [ Datasheet ACT8740.PDF ] | |
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