ACTIVE-SEMI ACT6330_08

ACT6330
Rev0, 02-Apr-08
Dual PWM Step-Up DC/DCs in TQFN33
FEATURES
GENERAL DESCRIPTION
• Multiple Patents Pending
• Two Integrated Regulators
The patent-pending ACT6330 integrates two stepup 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 technology but does not require a high level of integration.
− 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
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.
− Only 0.75mm Height
− RoHS Compliant
APPLICATIONS
•
•
•
•
Portable Devices and PDAs
The ACT6330 is available in a tiny 3mm x 3mm 16
pin Thin-QFN package that is just 0.75mm thin.
MP3/MP4 Players
Wireless Handhelds
GPS Receivers
SYSTEM BLOCK DIAGRAM
REG1
Battery
Step-Up
DC/DC
OUT1
WLED Bias
Up to 18 LEDs
ON1
System
Control
ON2
Pb-free
REG2
Step-Up
DC/DC
ACT6330
PMU
Active
Innovative PowerTM
ActivePMUTM is a trademark of Active-Semi.
OUT2
Up to 20V
TM
-1-
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Copyright © 2008 Active-Semi, Inc.
ACT6330
Rev0, 02-Apr-08
FUNCTIONAL BLOCK DIAGRAM
To Battery
ACT6330
IN
SW1
OUT1
UVLO
ON1
REG1
OVP1
ON2
FB1
GP12
SW2
To Battery
OUT2
REG2
OVP2
FB2
GP12
GA
Innovative PowerTM
ActivePMUTM is a trademark of Active-Semi.
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Copyright © 2008 Active-Semi, Inc.
ACT6330
Rev0, 02-Apr-08
ORDERING INFORMATION
PART NUMBER
PACKAGE
PINS
TEMPERATURE RANGE
ACT6330QK-T
TQFN33-16
16
-40°C to +85°C
All Active-Semi product are offered in lead-free RoHS Compliant packaging. The term “Pb-free” means semiconductor products that
are in compliance with current RoHS (Restriction of Hazardous Substances) standards.
PIN CONFIGURATION
TOP VIEW
GA
GA
GA
IN
16
15
14
13
GA
1
12
ON1
GA
2
11
ON2
GA
3
ACT6330
10
FB2
FB1
4
EP
9
OVP2
OVP1
SW1
7
8
SW2
6
GP12
5
Thin - QFN (TQFN 33-16)
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Copyright © 2008 Active-Semi, Inc.
ACT6330
Rev0, 02-Apr-08
PIN DESCRIPTIONS
PIN
NAME
DESCRIPTION
1, 2, 3,
14, 15, 16
GA
Analog Ground. Connect GAs directly to a quiet ground node. Connect GAs and GP12 together at a single point as close to the IC as possible.
4
FB1
Feedback Sense for REG1. Connect this pin to the LED string current sense resistor to sense
the LED current.
5
OVP1
Over-Voltage Protection Input for REG1. Connect this pin directly to the output node to sense
and prevent over-voltage conditions.
6
SW1
Switching Node Output for REG1. Connect this pin to the switching end of the inductor.
7
GP12
Power Ground for REG1, REG2. Connect GP12 directly to a power ground plane. Connect
GAs and GP12 together at a single point as close to the IC as possible.
8
SW2
Switching Node Output for REG2. Connect this pin to the switching end of the inductor.
9
OVP2
Over-Voltage Protection Input for REG2. Connect this pin directly to the output node to sense
and prevent over-voltage conditions.
10
FB2
Feedback Sense for REG2. Connect this pin to the center point of a resistive voltage divider
to sense output voltage.
11
ON2
Enable Control Input for REG2. Drive ON2 to IN or to a logic high for normal operation, drive
to GA or a logic low to disable REG2.
12
ON1
Enable Control Input for REG1. Drive ON1 to IN or to a logic high for normal operation, drive
to GA or a logic low to disable REG1.
13
IN
Power Input for the IC. Bypass IN to GA with a capacitor placed as close as possible to the IC.
EP
EP
Exposed Pad. Must be soldered to ground on the PCB.
Innovative PowerTM
ActivePMUTM is a trademark of Active-Semi.
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Copyright © 2008 Active-Semi, Inc.
ACT6330
Rev0, 02-Apr-08
ABSOLUTE MAXIMUM RATINGSc
PARAMETER
VALUE
UNIT
IN, ON1, ON2, FB1, FB2 to GA
-0.3 to +6
V
OVP1, OVP2, SW1, SW2 to GP12
-0.3 to +25
V
GP12 to GA
-0.3 to +0.3
V
33.3
°C/W
-40 to 85
°C
125
°C
-55 to 150
°C
300
°C
Junction to Ambient Thermal Resistance (θJA)
Operating Temperature Range
Junction Temperature
Store Temperature
Lead Temperature (Soldering, 10 sec)
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.
ACT6330
Rev0, 02-Apr-08
WLED BIAS DC/DC CONVERTER (REG1)
ELECTRICAL CHARACTERISTICS
( VIN = 3.6V, TA = 25°C, unless otherwise specified.)
PARAMETER
TEST CONDITIONS
IN Operating Voltage Range
MIN
TYP
3.1
6
V
3.1
V
IN Voltage Rising
UVLO Hysteresis
IN Voltage Falling
100
ON1 = IN, VFB1 = 0.3V
75
150
µA
ON1 = GA, ILOAD = 0mA
0.1
1
µA
0.255
0.275
V
FB1 Feedback Voltage
0.235
FB1 Input Current
3
UNIT
UVLO Voltage Threshold
Supply Current
2.9
MAX
mV
50
Oscillator Frequency
1.35
Minimum On-Time
Maximum Duty Cycle
Switch Current Limit
Duty = 83%, L1 = 22uH, COUT1 = 4.7uF
Switch On-Resistance
ISW1 = 100mA
Switch Leakage Current
VSW1 = 25V, ON1 = GA
Logic High Input Voltage
ON1
Logic Low Input Voltage
ON1
ON1 Leakage Current
VON1 = 0V to 5.5V
1.6
nA
1.85
100
ns
87
92
%
500
750
mA
0.67
1.1
Ω
10
µA
1.4
Over-Voltage Threshold
MHz
21
V
22
0.4
V
1
µA
23
V
Thermal Shutdown Temperature
Temperature rising
160
°C
Thermal Shutdown Hysteresis
Temperature falling
20
°C
Innovative PowerTM
ActivePMUTM is a trademark of Active-Semi.
-6-
www.active-semi.com
Copyright © 2008 Active-Semi, Inc.
ACT6330
Rev0, 02-Apr-08
WLED BIAS DC/DC CONVERTER (REG1)
FUNCTIONAL DESCRIPTION
Inductor Selection
General Description
REG1 has been designed to provide excellent performance across a wide range of applications, allowing a design to be optimized for both a small
footprint as well as for achieving the highest possible efficiency. REG1 was designed for operation
with inductor in the 10µH to 22µH range, in order to
achieve a small footprint , although larger inductor
values of up to 68µH can be used in order to optimize a design to achieve the highest possible efficiency.
REG1 is highly efficient step-up DC/DC converter
that employs a fixed frequency, current-mode,
PWM architecture. This regulator is optimized for
white-LED bias applications consisting of up to six
white-LEDs.
Over-Voltage Protection
REG1 features internal over-voltage protection
(OVP) circuitry which protects the system from LED
open-circuit fault conditions. The ACT6330’s OVP
threshold is set at 22V, and if necessary, regulates
the voltage at the top of the LED string to ensure
that it never exceeds this voltage. REG1 requires a
10kΩ resistor connected from output capacitor to
OVP1 pin.
Optimizing for Smallest Footprint
REG1 is capable of operating with very low inductor
values in order to achieve the smallest possible
footprint . When solution size is of primary concern,
best results are achieved when an inductance value
that ensures discontinuous conduction mode (DCM)
operation over the full load current range is used.
Thermal Shutdown Protection
Optimizing for Highest Efficiency
The ACT6330 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 ACT6330 die temperature exceeds
160°C, and prevents the regulators from being enabled until the IC temperature drops by 20°C (typ).
REG1 achieves excellent efficiency in applications
that demand the longest possible battery life. When
efficiency is the primary design consideration, best
results are achieved when an inductance value that
both results in continuous conduction mode (CCM)
operation and achieves a very small inductor ripple
current is chosen.
Enabling and Disabling REG1
Output Capacitor Selection
REG1 is enabled or disabled using ON1. Drive ON1
to a logic-high to enable REG1. Drive ON1 to a
logic-low to disable REG1, reducing supply current
to less than 1µA. As with all non-synchronous stepup DC/DC converter, REG1’s application circuit procedures a DC current path between the input and
the output in shutdown mode. Although the forward
drop of the WLEDs makes this leakage current very
small in most applications, it is important to consider the effect that this may have in your application particularly when using fewer than three
WLEDs.
REG1 is designed to operate with output capacitors
ranging from 1µF to 10µF, providing design flexibility. A 1µF output capacitor is suitable for most applications, although larger output capacitors may be
used to minimize output voltage ripple, if needed.
Ceramic capacitors are recommended for most applications.
Rectifier Selection
REG1 requires a Shottky diode to rectify the inductor current. Select a low forward voltage drop Shottky diode with a forward current (IF) rating that is
sufficient to support the maximum switch current
and a sufficient peak repetitive reverse voltage
(VRRM) to support the output voltage.
Compensation and Stability
REG1 utilizes current-mode control and an internal
compensation network to optimize transient performance, ease compensation, and improve stability over a wide range of operating conditions. REG1
is a flexible regulator, and with just a simple component, 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.
Innovative PowerTM
ActivePMUTM is a trademark of Active-Semi.
-7-
www.active-semi.com
Copyright © 2008 Active-Semi, Inc.
ACT6330
Rev0, 02-Apr-08
WLED BIAS DC/DC CONVERTER (REG1)
Setting the LED Bias Current
The LED bias current is set by a resistor connected
from FB1 and ground, and regulator is satisfied
when the LED current is sufficient to generate
250mV across this resistor. Once the bias current is
programmed, the LED current can be adjusted using the ACT6330’s Direct-PWM feature. REG1 is
also compatible with a variety of well-know LED
dimming circuit, such as with a DC control voltage
and a filtered PWM signal.
Board Layout
Typical for all switching power supplies, the layout
is an important step in design, especially at high
peak current and switching frequencies, please refer to PCB Layout Consideration for more information.
Innovative PowerTM
ActivePMUTM is a trademark of Active-Semi.
-8-
www.active-semi.com
Copyright © 2008 Active-Semi, Inc.
ACT6330
Rev0, 02-Apr-08
WLED BIAS DC/DC CONVERTER (REG1)
TYPICAL PERFORMANCE CHARACTERISTICS
(ACT6330QK, VIN = 3.6V, L = 22µH, CIN = 2.2µF, COUT= 2.2µF, TA = 25°C, unless otherwise specified.)
REG1 Efficiency vs. Output Current
PWM Output Current Adjustment
Efficiency (%)
90
6 LEDs
Normalized Output Current (%)
4 LEDs
80
70
60
50
1
5
9
13
17
21
25
ON1 PWM Frequency = 1kHz
90
80
70
60
50
40
30
20
10
0
0
31
10
20
30
40
50
60
70
80
Output Current (mA)
ON1 Duty Cycle (%)
REG1 RDSON
REG1 Over-Voltage Protection
800
700
90
100
ACT6330-004
ACT6330-003
900
RDSON (mΩ)
100
ACT6330-002
ACT6330-001
100
CH1
600
500
400
CH2
300
0V
200
2.5
3.0
3.5
4.0
4.5
5.0
5.5
CH1: VOUT1, 10V/div
CH2: VFB1, 200mV/div
TIME: 2ms/div
IN Voltage (V)
REG1 Startup Waveform
ACT6330-005
CH1
0V
CH2
0V
CH1: VOUT1, 10V/div
CH2: VON1, 1V/div
TIME: 100µs/div
Innovative PowerTM
ActivePMUTM is a trademark of Active-Semi.
-9-
www.active-semi.com
Copyright © 2008 Active-Semi, Inc.
ACT6330
Rev0, 02-Apr-08
STEP-UP DC/DC CONVERTER (REG2)
ELECTRICAL CHARACTERISTICS
( VIN = 3.6V, TA = 25°C, unless otherwise specified.)
PARAMETER
TEST CONDITIONS
IN Operating Voltage Range
MIN
TYP
3.1
6
V
3.1
V
IN Voltage Rising
UVLO Hysteresis
IN Voltage Falling
100
ON2 = IN, VFB2 = 0.3V
75
150
µA
ON2 = GA, ILOAD = 0mA
0.1
1
µA
1.25
1.27
V
FB2 Feedback Voltage
1.23
FB2 Input Current
3
UNIT
UVLO Voltage Threshold
Supply Current
2.9
MAX
mV
50
Oscillator Frequency
1.35
Minimum On-Time
Maximum Duty Cycle
Switch Current Limit
Duty = 83%, L2 = 22uH, COUT2 = 4.7uF
Switch On-Resistance
ISW2 = 100mA
Switch Leakage Current
VSW2 = 25V, ON2 = GA
Logic High Input Voltage
ON2
Logic Low Input Voltage
ON2
ON2 Leakage Current
VON2 = 0V to 5.5V
1.6
nA
1.85
100
ns
87
92
%
500
750
mA
0.67
1.1
Ω
10
µA
1.4
Over-Voltage Threshold
MHz
21
V
22
0.4
V
1
µA
23
V
Thermal Shutdown Temperature
Temperature rising
160
°C
Thermal Shutdown Hysteresis
Temperature falling
20
°C
Innovative PowerTM
ActivePMUTM is a trademark of Active-Semi.
- 10 -
www.active-semi.com
Copyright © 2008 Active-Semi, Inc.
ACT6330
Rev0, 02-Apr-08
STEP-UP DC/DC CONVERTER (REG2)
FUNCTIONAL DESCRIPTION
General Description
Figure 1:
REG2 Startup Waveform into no load
CH2
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
CH1
CH1: VON2, 2V/div
CH2: VOUT2, 5V/div
TIME: 250µs/div
Figure 2:
REG2 Startup Waveform into full load
ACT6330-007
The Thermal shutdown protection prevents excessive thermal stress, please refer to Thermal Shutdown Protection for more information.
ACT6330-006
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 generation constant voltage of up to 20V.
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.
CH2
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 stepup DC/DC converter, REG2’s application circuit procedures a DC current path between the input and
the output in shutdown mode. It is important to consider the effect that this may have in your application.
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.
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:
⎛
R ⎞
VOUT 2 = VFB2 ⎜⎜1 + FB1 ⎟⎟
R
FB2 ⎠
⎝
(1)
Where VFB2 is 1.25V.
Figure 3:
Output Voltage Setting
V OUT2
Compensation and Stability
REG2 utilizes current-mode control and an internal
compensation network to optimize transient performance, ease compensation, and improve stability over a wide range of operating conditions. REG2
is a flexible regulator, and with just a simple compoInnovative PowerTM
ActivePMUTM is a trademark of Active-Semi.
ACT6330
R FB1
FB2
R FB2
- 11 -
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Copyright © 2008 Active-Semi, Inc.
ACT6330
Rev0, 02-Apr-08
STEP-UP DC/DC CONVERTER (REG2)
FUNCTIONAL DESCRIPTION CONT’D
Inductor Selection
Rectifier Selection
REG2 has been designed to provide excellent performance across a wide range of applications, allowing a design to be optimized for both a small
footprint as well as for achieving the highest possible efficiency.
REG2 requires a Shottky diode to rectify the inductor current. Select a low forward voltage drop Shottky diode with a forward current (IF) rating that is
sufficient to support the maximum switch current
and a sufficient peak repetitive reverse voltage
(VRRM) to support the output voltage.
Optimizing for Smallest Footprint
REG2 is capable of operating with very low inductor
values in order to achieve the smallest possible
footprint . When solution size is of primary concern,
best results are achieved when an inductance value
that ensures discontinuous conduction mode (DCM)
operation over the full load current range is used.
Optimizing for Highest Efficiency
REG2 achieves excellent efficiency in applications
that demand the longest possible battery life. When
efficiency is the primary design consideration, best
results are achieved when an inductance value that
both results in continuous conduction mode (CCM)
operation and achieves a very small inductor ripple
current is chosen. Table 1 provides recommended
inductance values.
Table 1:
Recommended Inductance Values
Output Voltage (V)
L (µH)
9
10
12
15
18
22
Output Capacitor Selection
REG2 is designed to operate with output capacitor
ranging from 1µF to 10µF. A 2.2µF output capacitor
is suitable for most applications, although lager output capacitor may be used to minimize output ripple, if need. Ceramic capacitors are recommended
for most applications.
Innovative PowerTM
ActivePMUTM is a trademark of Active-Semi.
PCB Layout Considerations
High switching frequencies and large peak currents
make PC board layout a very important part of the
design. Good design minimizes excessive EMI on
the feedback paths and voltage gradients in the
ground plane, both of which can result in instability
or regulation errors.
Step-up DC/DCs exhibit continuous input current,
so there is some amount of flexibility in placing vias
in the input capacitor circuit. The input capacitor
should be placed as close as possible to the input
pin for good input voltage filtering.
The inductor, input filter capacitor, rectifier, and output filter capacitor should be connected as close
together as possible, with short, direct, and wide
traces. Avoid using vias in the high-current path. If
vias are unavoidable , use many vias in parallel to
reduce resistance and inductance.
Place all feedback voltage-divider resistor as close
as possible to their respective feedback pins. Connect the ground nodes together in a star configuration, with a direct connection to the exposed pad.
Route high-speed switching nodes away from the
sensitive analog areas. Finally, the exposed pad
should be directly connected to the backside
ground plane using multiple vias to achieve low
electrical and thermal resistance. Note that since
the LED string is a low, DC-current path, it does not
generally require special layout consideration.
- 12 -
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Copyright © 2008 Active-Semi, Inc.
ACT6330
Rev0, 02-Apr-08
STEP-UP DC/DC CONVERTER (REG2)
TYPICAL PERFORMANCE CHARACTERISTICS
(ACT6330QK, VIN = 3.6V, L = 22µH, CIN = 2.2µF, COUT = 2.2µF, TA = 25°C, unless otherwise specified.)
REG2 Efficiency vs. Output Current
VOUT2 = 12V
ACT6330-008
100
4.2V
Efficiency (%)
90
80
3.6V
70
60
50
40
30
0
50
100
200
150
Output Current (mA)
REG2 RDSON
ACT6330-009
900
800
RDSON (mΩ)
700
600
500
400
300
3.0
3.5
4.0
4.5
5.0
4.5
5.0
200
2.5
3.0
3.5
4.0
5.5
IN Voltage (V)
REG2 Over-Voltage Protection
ACT6330-010
CH1
CH2
0V
CH1: VOUT2, 10V/div
CH2: VFB2, 200mV/div
TIME: 2ms/div
Innovative PowerTM
ActivePMUTM is a trademark of Active-Semi.
- 13 -
www.active-semi.com
Copyright © 2008 Active-Semi, Inc.
ACT6330
Rev0, 02-Apr-08
PACKAGE INFORMATION
PACKAGE OUTLINE
TQFN33-16 PACKAGE OUTLINE AND DIMENSIONS
D
SYMBOL
E
DIMENSION IN
INCHES
MIN
MAX
MIN
MAX
A
0.700
0.800
0.028
0.031
A1
0.000
0.050
0.000
0.002
A3
0.153
0.253
0.006
0.010
D
2.900
3.100
0.114
0.122
E
2.900
3.100
0.114
0.122
D2
1.600
1.800
0.063
0.071
E2
1.600
1.800
0.063
0.071
b
0.180
0.300
0.007
0.012
e
e
DIMENSION IN
MILLIMETERS
0.500 TYP
0.020 TYP
L
0.300
0.500
0.012
0.020
K
0.200
0.400
0.008
0.016
E2
Active-Semi, Inc. reserves the right to modify the circuitry or specifications without notice. Users should evaluate each product to make
sure that it is suitable for their applications. Active-Semi products are not intended or authorized for use as critical components in lifesupport devices or systems. Active-Semi, Inc. does not assume any liability arising out of the use of any product or circuit described in
this datasheet, nor does it convey any patent license.
Active-Semi and its logo are trademarks of Active-Semi, Inc. For more information on this and other products, contact [email protected] or visit http://www.active-semi.com. For other inquiries, please send to:
1270 Oakmead Parkway, Suite 310, Sunnyvale, California 94085-4044, USA
Innovative PowerTM
ActivePMUTM is a trademark of Active-Semi.
- 14 -
www.active-semi.com
Copyright © 2008 Active-Semi, Inc.