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PDF ACT6330 Data sheet ( Hoja de datos )
| Número de pieza | ACT6330 | |
| Descripción | Dual PWM Step-Up DC/DCs | |
| Fabricantes | Active-Semi | |
| Logotipo |  |
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ACT6330www.DataSheet4U.com
Rev0, 02-Apr-08
Dual PWM Step-Up DC/DCs in TQFN33
FEATURES
• Multiple Patents Pending
• Two Integrated Regulators
− PWM Step-Up DC/DC with OVP for WLED
Bias
− PWM Step-Up DC/DC Converter with OVP
• Independent Enable/Disable Control
• Minimal External Components
• 3×3mm, Thin-QFN (TQFN33-16) Package
− Only 0.75mm Height
− RoHS Compliant
APPLICATIONS
• Portable Devices and PDAs
• MP3/MP4 Players
• Wireless Handhelds
• GPS Receivers
GENERAL DESCRIPTION
The patent-pending ACT6330 integrates two step-
up DC/DC into a single, thin, space-saving package
to provide a cost-effective, highly-efficient ActivePMUTM
power management solution. This device is ideal for
a wide range of portable handheld equipment that
can benefit from the advantages of ActivePMU tech-
nology but does not require a high level of integra-
tion.
REG1 and REG2 are fixed-frequency, current mode
PWM step-up DC/DC converter. REG1 is optimized
for high-efficiency WLED bias applications. REG2 is
optimized for voltage regulation applications, while
together these output can provide a complete TFT
bias and backlighting solution for portable handheld
equipment.
The ACT6330 is available in a tiny 3mm x 3mm 16
pin Thin-QFN package that is just 0.75mm thin.
SYSTEM BLOCK DIAGRAM
Battery
ON1
ON2
System
Control
ACT6330
PMUActive
TM
REG1
Step-Up
DC/DC
REG2
Step-Up
DC/DC
OUT1
WLED Bias
Up to 18 LEDs
OUT2
Up to 20V
Pb-free
Innovative PowerTM
ActivePMUTM is a trademark of Active-Semi.
-1-
www.active-semi.com
Copyright © 2008 Active-Semi, Inc.
1 page  
ACT6330www.DataSheet4U.com
Rev0, 02-Apr-08
ABSOLUTE MAXIMUM RATINGSc
PARAMETER
IN, ON1, ON2, FB1, FB2 to GA
OVP1, OVP2, SW1, SW2 to GP12
GP12 to GA
Junction to Ambient Thermal Resistance (θJA)
Operating Temperature Range
Junction Temperature
Store Temperature
Lead Temperature (Soldering, 10 sec)
VALUE
-0.3 to +6
-0.3 to +25
-0.3 to +0.3
33.3
-40 to 85
125
-55 to 150
300
UNIT
V
V
V
°C/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.
-5-
www.active-semi.com
Copyright © 2008 Active-Semi, Inc.
5 Page 
ACT6330www.DataSheet4U.com
Rev0, 02-Apr-08
STEP-UP DC/DC CONVERTER (REG2)
FUNCTIONAL DESCRIPTION
General Description
REG2 is a highly efficient step-up DC/DC converter
that employs a fixed frequency, current-mode,
PWM architecture. This regulator is optimized for
use in a wide range of applications including gen-
eration constant voltage of up to 20V.
Over-Voltage Protection
REG2 features internal over-voltage protection
(OVP) circuitry which protects the system from fault
conditions. The ACT6330’s OVP threshold is set at
22V, and if necessary, regulates the output voltage
to ensure that it never exceeds this voltage.
ACT6330 requires a 10kΩ resistor connected from
output capacitor to OVP2 pin.
Thermal Protection
The Thermal shutdown protection prevents exces-
sive thermal stress, please refer to Thermal Shut-
down Protection for more information.
Enabling and Disabling REG2
REG2 is enabled or disabled using ON2. Drive ON2
to a logic-high to enable REG2. Drive ON2 to a
logic-low to disable REG2, reducing supply current
to less than 1µA. As with all non-synchronous step-
up DC/DC converter, REG2’s application circuit pro-
cedures a DC current path between the input and
the output in shutdown mode. It is important to con-
sider the effect that this may have in your applica-
tion.
Soft-start
REG2 includes soft-start circuitry. When enabled,
the output voltage of REG2 tracks an internal 80µs
soft-start ramp.
As seen in Figure 1 and Figure 2, the output tracks
the internal soft-start ramp and powers up in a
monotonic maner that is independent of loading.
This circuitry ensures that the output powers up in a
controlled maner, greatly simplifying power turn-on
design considerations.
Compensation and Stability
REG2 utilizes current-mode control and an internal
compensation network to optimize transient per-
formance, ease compensation, and improve stabil-
ity over a wide range of operating conditions. REG2
is a flexible regulator, and with just a simple compo-
nent, choice can be optimized to achieve minimum
total solution size in applications that require the
smallest possible footprint, or can be optimized to
achieve the highest possible efficiency.
Figure 1:
REG2 Startup Waveform into no load
CH2
CH1
CH1: VON2, 2V/div
CH2: VOUT2, 5V/div
TIME: 250µs/div
Figure 2:
REG2 Startup Waveform into full load
CH2
CH1
CH1: VON2, 2V/div
CH2: VOUT2, 5V/div
TIME: 250µs/div
Output Voltage Selection
Figure 3 shows the feedback network necessary to
set the output voltage when using the adjustable
voltage option. Select components as follows: Set
RFB2 = 51kΩ, then caculate RFB1 using the following
equation:
VOUT 2
= VFB2 ⎜⎜⎝⎛1 +
RFB1
RFB2
⎟⎟⎠⎞
Where VFB2 is 1.25V.
(1)
Figure 3:
Output Voltage Setting
VOUT2
ACT6330
FB2
RFB1
RFB2
Innovative PowerTM
ActivePMUTM is a trademark of Active-Semi.
- 11 -
www.active-semi.com
Copyright © 2008 Active-Semi, Inc.
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet ACT6330.PDF ] | |
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