ACTIVE-SEMI EA4526YH 40v/3.0a cv/cc buck converter featuring qc2.0 certified Datasheet

ACT4526
Rev 2, 06-Jan-2017
40V/3.0A CV/CC Buck Converter Featuring QC2.0 Certified
APPLICATIONS
FEATURES
 Quick Charge™ 2.0 Certified by Qualcomm




®
and UL.
 UL Certificate No. 4787034072-1
 http://www.qualcomm.com/documents/quickc
harge-device-list
 40V Input Voltage Surge
 4.5V-36V Operational Input Voltage
 5.1V/9.1V/12.1V Output with +/-1% Accuracy
 Up to 3.0A Output current
 Constant Current Regulation Limit
 QC2.0 Decoding
 Hiccup Mode Protection at Output Short
 >90% Efficiency at Full Load
 0.5mA Low Standby Input Current
 5.7V/10.1V/13.5V Output Over-voltage
Protection for 5.1V/9.1V/12.1V Outputs
 Cord Voltage Compensation
 Meet EN55022 Class B Radiated EMI Standard
 8kV ESD HBM Protection on DP and DM
 SOP-8EP Package
Car Charger
Cigarette Lighter Adaptor (CLA)
Rechargeable Portable Device
CV/CC regulation DC/DC converter
GENERAL DESCRIPTION
ACT4526 is a wide input voltage, high efficiency
step-down DC/DC converter that operates in either
CV (Constant Output Voltage) mode or CC
(Constant Output Current) mode. ACT4526 has
QC2.0 decoding built in to provide 5.1V/9.1V/12.1V
outputs as requested by attached portable devices.
ACT4526 has accurate output current limits under
constant current regulation to meet MFi
specification. ACT4526 provides up to 3.0A output
current at 125kHz switching frequency. ACT4526
utilizes adaptive drive technique to achieve good
EMI performance while main >90% efficiency at full
load for mini size CLA designs. It also has output
short circuit protection with hiccup mode. The
average output current is reduced to below 6mA
when output is shorted to ground. Other features
include output over voltage protection and thermal
shutdown.
Typical Application Circuit
CSN
4.5V to 40V
C3
22nF
HSB
SW
IN
CSP
C2
10ìF
GND
DP
Vout
C4
C5
22ìF 220ìF
DM
D1
SK54L
V/I Profile
5V/9V/12V
L1
47ìH
ACT4526
C1
47ìF
Rcs
25mÙ
C6
2.2ìF
DD+
GND
Vout
12.1V
9.1V
5.1V
3.2V
2.65A
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-1-
Iout
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Copyright © 2015 Active-Semi, Inc.
ACT4526
Rev 2, 06-Jan-2017
ORDERING INFORMATION
PART NUMBER
OPERATION TEMPERATURE RANGE
PACKAGE
FREQUENCY
PACKING
ACT4526YH-T
-40°C to 85°C
SOP-8EP
125kHz
TAPE & REEL
PIN CONFIGURATION
CSP
1
8
HSB
CSN
2
7
SW
6
IN
5
DM
ACT4526
NC
DP
3
4
GND
EP
SOP-8EP
Top View
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Copyright © 2015-2017 Active-Semi, Inc.
ACT4526
Rev 2, 06-Jan-2017
PIN DESCRIPTIONS
PIN
NAME
DESCRIPTION
1
CSP
Voltage Feedback Input. Connect to node of the inductor and output capacitor. CSP
and CSN Kevin sense is recommended.
2
CSN
Negative input terminal of output current sense. Connect to the negative terminal of
current sense resistor.
3
NC
Not connected.
4
DP
Data Line Positive Input. Connected to D+ of attached portable device data line. This
pin passes 8kV HBM ESD.
5
DM
Data Line Negative Input. Connected to D- of attached portable device data line. This
pin passes 8kV HBM ESD.
6
IN
Power Supply Input. Bypass this pin with a 10ìF ceramic capacitor to GND, placed as
close to the IC as possible.
7
SW
Power Switching Output to External Inductor.
8
HSB
High Side Bias Pin. This provides power to the internal high-side MOSFET gate driver.
Connect a 22nF capacitor from HSB pin to SW pin.
9
GND
Ground and Heat Dissipation Pad. Connect this exposed pad to large ground copper
area with copper and vias.
ABSOLUTE MAXIMUM RATINGS
PARAMETER
VALUE
UNIT
-0.3 to 40
V
SW to GND
-1 to VIN +1
V
HSB to GND
VSW - 0.3 to VSW + 7
V
CSP, CSN to GND
-0.3 to +15
V
All other pins to GND
-0.3 to +6
V
46
°C/W
Operating Junction Temperature
-40 to 150
°C
Storage Junction Temperature
-55 to 150
°C
300
°C
IN to GND
Junction to Ambient Thermal Resistance
Lead Temperature (Soldering 10 sec.)
: Do not exceed these limits to prevent damage to the device. Exposure to absolute maximum rating conditions for long periods may
affect device reliability.
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Copyright © 2015-2017 Active-Semi, Inc.
ACT4526
Rev 2, 06-Jan-2017
ELECTRICAL CHARACTERISTICS
(VIN = 12V, TA = 25°C, unless otherwise specified.)
Parameter
Input Over Voltage Protection
Symbol
VIN_OVP
Condition
Rising
Min
Typ
Max
Units
40
42
44
V
Input Over Voltage Hysteresis
Input Over Voltage Response Time
Input Under Voltage Lockout (UVLO)
T_VIN_OVP VIN step from 30V to 45V
VIN
Rising
Input UVLO Hysteresis
4
V
250
ns
4.5
V
200
mV
Input Voltage Power Good Deglitch
Time
No OVP
40
ms
Input Voltage Power Good Deglitch
Time
No UVP
10
us
Input Standby Current
Vin=12V, Vout=5.1V, Iload=0
500
uA
Output Voltage Regulation
CSP
5.05
5.1
5.15
9.0
9.1
9.2
11.95
12.1
12.25
V
5.7
Output Over Voltage Protection
(OVP)
Output rising
10.1
V
13.5
Output Over Voltage Deglitch Time
1.0
Output Voltage Cord Compensation
Output current 2.4A
-15%
200
+15%
mV
-10%
3.2
10%
V
Output Under Voltage Protection
(UVP)
VOUT
VOUT falling
UVP Hysteresis
VOUT
VOUT rising
UVP Deglitch Time
VOUT
UVP Blanking Time at Startup
Output Constant Current Limit
us
Rcs=25mÙ
2.50
Hiccup Waiting Time
0.2
V
10
us
3.5
ms
2.65
2.80
A
4.13
S
5.8
A
Top FET Rdson
70
mΩ
Bottom FET Rdson
4.7
Ω
Top FET Cycle by Cycle Current
Limit
4.5
Maximum Duty Cycle
99
Switching Frequency
-10%
Soft-start Time
Innovative PowerTM
%
125
2.0
-4-
+10%
kHz
ms
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Copyright © 2015-2017 Active-Semi, Inc.
ACT4526
Rev 2, 06-Jan-2017
ELECTRICAL CHARACTERISTICS
(VIN = 12V, TA = 25°C, unless otherwise specified.)
Parameter
Symbol
Condition
Min
Typ
Max
Units
Out Voltage Ripples
Cout=470uF/22uF ceramic
80
mV
VOUT Discharge Current
For high to lower voltage transitions
60
mA
Voltage transition time for QC 2.0
transition
12V-5V
100
ms
Voltage transition time for QC 2.0
transition
5V-12V
100
ms
Line Transient Response
Input 12V-40V-12V with 1V/us
slew rate, Vout=5V, Iload=0A
and 2.4A
4.75
5.25
V
Vout=5V
80mA-1.0A-80mA load with
0.1A/us slew rate
4.9
5.15
5.4
V
Vout=9V
80mA-1.0A-80mA load with
8.7
9.1
9.5
V
Vout=12V
80mA-1.0A-80mA load with
11.6
12.1
12.6
V
Load Transient Response
Thermal Shut Down
160
°C
Thermal Shut Down Hysteresis
30
°C
8
kV
ESD of DP, DM
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HBM
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Copyright © 2015-2017 Active-Semi, Inc.
ACT4526
Rev 2, 06-Jan-2017
FUNCTIONAL BLOCK DIAGRAM
HSB
VIN
UVLO
PWM
Controller
70mΩ
QC2.0
Detect
Driver
SW
4.7Ω
DP
OVP
Current Sense
and Control
DM
CSP
CSN
GND
FUNCTIONAL DESCRIPTION
Output Under-Voltage Protection /
Hiccup Mode
Output Current Sensing and Regulation
Sense resistor is connected to CSP and CSN. The
sensed differential voltage is compared with interval
reference to regulate current. CC loop and CV loop
are in parallel. The current loop response is allowed
to have slower response compared to voltage loop.
However, during current transient response, the
inductor current overshoot/undershoot should be
controlled within +/-25% to avoid inductor
saturation.
There is a under voltage protection (UVP)
threshold. If the UVP threshold is hit for 10us, an
over current or short circuit is assumed, and the
converter goes into hiccup mode by disabling the
converter and restarts after hiccup waiting period.
Cord Compensation
The conventional cycle-by-cycle peak current mode
is implemented with high-side FET current sense.
In some applications, the
increased with output current
potential voltage drop across
compensation is based on the
resistance.
Input Over Voltage Protection
The compensation voltage is derived as:
The converter is disabled if the input voltage is
above 42V (+/-2V). Device resumes operation
automatically 40ms after OVP is cleared.
ÄVout = (VCSP-VCSN)*K
Cycle-by-Cycle Current Control
Where K=3.03
This voltage difference could be added on the
reference or turning the (VCSP-VCSN) voltage into a
sink current at FB pin to pull Vout higher than
programmed voltage.
Output Over Voltage Protection
Device stops switching when output over-voltage is
sensed, and resumes operation automatically when
output voltage drops to OVP- hysteresis.
The cord compensation loop should be very slow to
avoid potential disturbance to the voltage loop. The
voltage loop should be sufficiently stable on various
cord compensation setting.
Output Over Voltage Discharge
Discharge circuit starts to discharge output through
CSP pins when output over voltage is detected.
Discharge circuit brings 12V down to 5V in less
than 100ms.
Innovative PowerTM
output voltage is
to compensate the
output cable. The
high side feedback
Thermal Shutdown
If the TJ increases beyond 160°C, ACT4526 goes
into HZ mode and the timer is preserved until TJ
drops by 30°C.
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Copyright © 2015-2017 Active-Semi, Inc.
ACT4526
Rev 2, 06-Jan-2017
APPLICATIONS INFORMATION
recommended to parallel with tantalum or
electrolytic capacitor, which should be placed right
next to the IC.
Inductor Selection
The inductor maintains a continuous current to the
output load. This inductor current has a ripple that is
dependent on the inductance value.
Output Capacitor
Higher inductance reduces the peak-to-peak ripple
current. The trade off for high inductance value is
the increase in inductor core size and series
resistance, and the reduction in current handling
capability. In general, select an inductance value L
based on ripple current requirement:
VOUT × (VIN VOUT )
VIN fSW ILOADMAX K RIPPLE
The output capacitor also needs to have low ESR to
keep low output voltage ripple. The output ripple
voltage is:
VRIPPLE  I OUTMAX K RIPPLE RESR 
_
L=
(1)
With a selected inductor value the peak-to-peak
inductor current is estimated as:
VOUT × (VIN _VOUT )
L × VIN × fSW
The peak inductor current is estimated as:
1
ILPK = ILOADMAX + ILPK PK
2
_
(2)
For ceramic output capacitor, typically choose a
capacitance of about 22µF. For tantalum or
electrolytic capacitors, choose a capacitor with less
than 50mÙ ESR. If an 330µF or 470µF electrolytic
capacitor is used, where ripple is dominantly
caused by ESR, an 2.2uF ceramic in parallel is
recommended.
(3)
The selected inductor should not saturate at ILPK.
The maximum output current is calculated as:
IOUTMAX = ILIM _
1
I _
2 LPK PK
(5)
Where IOUTMAX is the maximum output current,
KRIPPLE is the ripple factor, RESR is the ESR of the
output capacitor, fSW is the switching frequency, L is
the inductor value, and COUT is the output
capacitance. In the case of ceramic output
capacitors, RESR is very small and does not
contribute to the ripple. Therefore, a lower
capacitance value can be used for ceramic type. In
the case of tantalum or electrolytic capacitors, the
ripple is dominated by RESR multiplied by the ripple
current. In that case, the output capacitor is chosen
to have sufficiently low ESR.
Where VIN is the input voltage, VOUT is the output
voltage, fSW is the switching frequency, ILOADMAX is
the maximum load current, and KRIPPLE is the ripple
factor. Typically, choose KRIPPLE = 30% to
correspond to the peak-to-peak ripple current being
30% of the maximum load current.
ILPK _ PK =
(VIN  VOUT )  VOUT
2
8  f SW LCOUT  VIN
Rectifier Schottky Diode
(4)
Use a Schottky diode as the rectifier to conduct
current when the High-Side Power Switch is off.
The Schottky diode must have current rating higher
than the maximum output current and a reverse
voltage rating higher than the maximum input
voltage. Further more, the low forward voltage
Schottky is preferable for high efficiency and
smoothly operation.
LLIM is the internal current limit.
Input Capacitor
The input capacitor needs to be carefully selected
to maintain sufficiently low ripple at the supply input
of the converter. A low ESR capacitor is highly
recommended. Since large current flows in and out
of this capacitor during switching, its ESR also
affects efficiency.
The input capacitance needs to be higher than
10µF. The best choice is the ceramic type.
However, low ESR tantalum or electrolytic types
may also be used provided that the RMS ripple
current rating is higher than 50% of the output
current. The input capacitor should be placed close
to the IN and GND pins of the IC, with the shortest
traces possible. In the case of tantalum or
electrolytic types, a ceramic capacitor is
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Copyright © 2015-2017 Active-Semi, Inc.
ACT4526
Rev 2, 06-Jan-2017
APPLICATIONS INFORMATION
Current Sense Resistor
The traces leading to and from the sense resistor
can be significant error sources. With small value
sense resistors, trace resistance shared with the
load can cause significant errors. It is
recommended to connect the sense resistor pads
directly to the CSP and CSN pins using “Kelvin” or
“4-wire” connection techniques as shown below.
PCB Load
Trace
Kevin Sense
Traces
Sense
Resistor
Current Limit Setting
If output current hits current limit, output voltage
drops to keep the current to a constant value.
The following equation calculates the constant
current limit.
ILimit ( A ) 
66 mV
Rcs ( m  )
(6)
Where Rcs is current sense resistor.
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ACT4526
Rev 2, 06-Jan-2017
APPLICATIONS INFORMATION
4) Schottky anode pad and IC exposed pad
should be placed close to ground clips in CLA
applications
PCB Layout Guidance
When laying out the printed circuit board, the
following checklist should be used to ensure proper
operation of the IC.
5) Use “Kelvin” or “4-wire” connection techniques
from the sense resistor pads directly to the CSP
and CSN pins. The CSP and CSN traces
should be in parallel to avoid interference.
1) Arrange the power components to reduce the
AC loop size consisting of CIN, VIN pin, SW pin
and the Schottky diode.
6) Place multiple vias between top and bottom
GND planes for best heat dissipation and noise
immunity.
2) The high power loss components, e.g. the
controller, Schottky diode, and the inductor
should be placed carefully to make the thermal
spread evenly on the board.
7) Use short traces connecting HSB-CHSB-SW
loop.
3) Place input decoupling ceramic capacitor CIN as
close to VIN pin as possible. CIN should be
connected to power GND with several vias or
short and wide copper trace.
8) SW pad is noise node switching from VIN to
GND. It should be isolated away from the rest
of circuit for good EMI and low noise operation.
Example PCB Layout
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Copyright © 2015-2017 Active-Semi, Inc.
ACT4526
Rev 2, 06-Jan-2017
Typical Application Circuit
CSN
4.5V to 40V
IN
C1
47ìF
C2
10ìF
GND
C3
22nF
HSB
U1
ACT4526
DP
Rcs
25mÙ
SW
5V/9V/12V
L1
47ìH
CSP
Vout
DM
D1
SK54L
C4
C5
22ìF 220ìF
C6
2.2ìF
DD+
GND
BOM List for 2.4A QC Car Charger
ITEM REFERENCE
DESCRIPTION
MANUFACTURER
QTY
1
U1
IC, ACT4526, SOP-8EP
Active-Semi
1
2
C1
Capacitor, Electrolytic, 47µF/35V
Murata, TDK
1
3
C2
Capacitor, Ceramic, 10µF/25V, 1206, SMD
Murata, TDK
1
4
C3
Capacitor, Ceramic, 22nF/25V, 0603, SMD
Murata, TDK
1
5
C4
Capacitor, Ceramic, 22µF/16V, 1206, SMD
Murata, TDK
1
6
C5
Capacitor, Electrolytic, 220µF/16V
Murata, TDK
1
7
C6
Capacitor, Ceramic, 2.2µF/16V, 0805, SMD
Murata, TDK
1
8
L1
Inductor, 47µH, 3.5A, 20%
9
D1
Diode, Schottky, 40V/5A, SK54L
Panjit
1
10
Rcs
Chip Resistor, 25mΩ, 1206, 1/2W, 1%
SART
1
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1
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Copyright © 2015-2017 Active-Semi, Inc.
ACT4526
Rev 2, 06-Jan-2017
TYPICAL PERFORMANCE CHARACTERISTICS
(Schematic as show in typical application circuit, Ta = 25°C, unless otherwise specified)
Efficiency vs. Load current ( 9V Vout)
Efficiency vs. Load current ( 5V Vout)
90
Efficiency (%)
Efficiency (%)
90
95
85
VIN =24V
80
75
85
80
75
70
70
65
65
60
60
0
500
1500
1000
2000
0
2500
500
2000
2500
Output CC/CV Curve (5V Vout)
Efficiency vs. Load current ( 12V Vout)
VIN =12V
VIN =24V
5.0
Output Voltage (V)
90
ACT4526-003
95
ACT4526-004
6.0
100
Efficiency (%)
1500
1000
Load Current (mA)
Load Current (mA)
85
80
75
70
VIN =24V
4.0
VIN =12V
3.0
2.0
1.0
65
60
0
0
500
1500
1000
2000
0
2500
500
Output CC/CV Curve (9V Vout)
2000
2500
3000
ACT4526-006
14.0
ACT4526-005
12.0
Output Voltage (V)
8.0
6.0
4.0
VIN =24V
1500
Output CC/CV Curve (12V Vout)
10.0
2.0
1000
Output Current (mA)
Load Current (mA)
Output Voltage (V)
VIN =12V
VIN =24V
ACT4526-002
VIN =12V
95
100
ACT4526-001
100
VIN =12V
10.0
8.0
6.0
4.0
2.0
VIN =12V
VIN =24V
0
0
0
500
1000
1500
2000
2500
3000
0
Output Current (mA)
Innovative PowerTM
500
1000
1500
2000
2500
3000
Output Current (mA)
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Copyright © 2015-2017 Active-Semi, Inc.
ACT4526
Rev 2, 06-Jan-2017
TYPICAL PERFORMANCE CHARACTERISTICS
(Schematic as show in typical application circuit, Ta = 25°C, unless otherwise specified)
Output Over Voltage (5V Vout)
Start up into CC Mode
ACT4526-008
ACT4526-007
CH1
CH1
VOUT = 5.1V
RLORD = 1.5Ù
IOUT = 2.65A
VIN = 12V
CH2
CH2
CH3
CH1: VIN, 10V/div
CH2: VOUT, 2V/div
CH3: IOUT, 2A/div
TIME: 400µs/div
CH1: VOUT, 1V/div
CH2: SW, 10V/div
TIME: 1ms/div
Load Transient (80mA-1A-80mA)
Vin=12V, Vout=5V
Load Transient (1A-2.4A-1A)
Vin=12V, Vout=5V
ACT4526-010
ACT4526-009
CH1
CH1
CH2
CH2
CH1: VOUT, 100mV/div
CH2: IOUT, 1A/div
TIME: 400us//div
CH1: VOUT, 200mV/div
CH2: IOUT, 1A/div
TIME: 400us//div
Load Transient (80mA-1A-80mA)
Vin=12.6V, Vout=12V
Load Transient (1A-2.4A-1A)
Vin=12.6V, Vout=12V
ACT4526-012
ACT4526-011
CH1
CH1
CH2
CH2
CH1: VOUT, 200mV/div
CH2: IOUT, 1A/div
TIME: 400us//div
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CH1: VOUT, 200mV/div
CH2: IOUT, 1A/div
TIME: 400us//div
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Copyright © 2015-2017 Active-Semi, Inc.
ACT4526
Rev 2, 06-Jan-2017
TYPICAL PERFORMANCE CHARACTERISTICS
(Schematic as show in typical application circuit, Ta = 25°C, unless otherwise specified)
Voltage Transient (5V-9V)
Voltage Transient (9V-5V)
ACT4526-014
ACT4526-013
CH1
CH1
CH1: VOUT, 2V/div
TIME: 10ms//div
CH1: VOUT, 2V/div
TIME: 10ms//div
Voltage Transient (5V-12V)
Voltage Transient (12V-5V)
ACT4526-016
ACT4526-015
CH1
CH1
CH1: VOUT, 2V/div
TIME: 10ms//div
Innovative PowerTM
CH1: VOUT, 2V/div
TIME: 10ms//div
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Copyright © 2015-2017 Active-Semi, Inc.
ACT4526
Rev 2, 06-Jan-2017
PACKAGE OUTLINE
SOP-8EP PACKAGE OUTLINE AND DIMENSIONS
SYMBOL
DIMENSION IN
MILLIMETERS
DIMENSION IN
INCHES
MIN
MAX
MIN
MAX
A
1.350
1.727
0.053
0.068
A1
0.000
0.152
0.000
0.006
A2
1.245
1.550
0.049
0.061
b
0.330
0.510
0.013
0.020
c
0.170
0.250
0.007
0.010
D
4.700
5.100
0.185
0.200
D1
3.202
3.402
0.126
0.134
E
3.734
4.000
0.147
0.157
E1
5.800
6.200
0.228
0.244
E2
2.313
2.513
0.091
0.099
e
1.270 TYP
0.050 TYP
L
0.400
1.270
0.016
0.050
è
0°
8°
0°
8°
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 life-support 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.
is a registered trademark of Active-Semi.
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