Diodes AP6015 High efficiency step-down low power dc-dc converter Datasheet

AP6015
High Efficiency Step-Down Low Power DC-DC Converter
General Description
Features
•
•
•
•
•
•
•
•
•
•
•
•
High efficiency synchronous step-down converter with
greater than 94%
Current Mode Operation for faster transient response
and better loop stabilization
2.5V to 5.5V operating input voltage range
Adjustable output voltage range from 0.8V to VIN
Fixed output voltage options: 1.8V, 2.5V and 3.3V
Up to 800mA output current
High efficiency over a wide range of load currents
PWM operation mode
Internal soft-start function
Typical quiescent current of 150μA
MSOP-10L: Available in “Green” Molding Compound
(No Br, Sb)
Lead Free Finish/ RoHS Compliant (Note 1)
The AP6015 is the first device in a family of low-noise current
mode synchronous step-down DC-DC converters. It is ideally
suited for systems powered by either a 1-cell Li-ion battery or a 2to 3-cell NiCd/ NiMH/ Alkaline battery.
The AP6015 is a synchronous PWM converter with integrated
N- and P-channel power MOSFET switches. Compared to the
asynchronous topology, synchronous rectification offers the
benefits of higher efficiency and reduced component count. The
high operating frequency of 1MHz allows small inductor and
capacitor to be used. This results in small pcb area. During
shut-down, the standby current drops to 1μA or less. The
AP6015 is available in the 10-pin MSOP package. It operates
o
o
over a free-air temperature range of -40 C to 85 C.
Applications
•
•
•
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Mobile Handsets
PDAs, Ultra Mobile PCs
Portable Media Players, Digital Still/Video Cameras
USB-based DSL Modems
LAN/WLAN/WPAN/WWAN Modules
Ordering Information
AP 6015 - XX M10 G - 13
Voltage
Package
Green
Packing
Blank : Adj
18 : 1.8V
25 : 2.5V
33 : 3.3V
M10 : MSOP-10L
G : Green
13 : Tape & Reel
Device
AP6015-XXM10G-13
Notes:
Package
Code
M10
Packaging
(Note 2)
MSOP-10L
13” Tape and Reel
Quantity
Part Number Suffix
2500/Tape & Reel
-13
1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied, see EU Directive 2002/95/EC Annex Notes.
2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at
http://www.diodes.com/datasheets/ap02001.pdf.
AP6015 Rev. 3
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AP6015
High Efficiency Step-Down Low Power DC-DC Converter
Pin Assignment
( Top View )
PVCC 1
10 PGND
LX
VCC 2
9
GND 3
8 EN
PG 4
7
FB/Vout 5
NC
6 CC
MSOP-10L
Pin Descriptions
Pin Name
Pin NO.
I/O
PVCC
1
I
Description
Supply voltage input
Supply bypass pin. A 1μF coupling capacitor should be connected as close
as possible to this pin.
VCC
2
GND
3
Ground
PG
4
O
Power good comparator output. A pull-up resistor should be connected
between PG and VO.
FB
5
I
Feedback pin for the fixed output voltage option.
CC
6
I
Compensation pin
NC
7
NC
EN
8
I
LX
9
I/O
PGND
10
AP6015 Rev. 3
No connect
Enable.Pin, H: Enable. L:shutdown
Connect the inductor to this pin.
Power ground
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AP6015
High Efficiency Step-Down Low Power DC-DC Converter
Block Diagram
CC
CC
VCC
UVLO
TS
SS
EN
CE
PG
PG
Bias
Open drain
Vref=0.8V
ER-AMP
+
FB
FB
PG_COM
Current
Protection
+
PVCC
PVCC
+
PWM-COM
-
BANDGAP
Osc
Vramp
LX
Buffer
-
GND
PGND
PGND
Notes:
3. The adjustable output voltage version does not use the internal feedback resistor divider.
The FB pin is directly connected to the error amplifier.
Absolute Maximum Ratings
Symbol
ESD HBM
ESD MM
PVCC, VCC
TJ(MAX)
TST
TOP
Parameter
Human Body Model ESD Protection
Machine Model ESD Protection
Supply Voltage
Voltages on pins EN, CC, PG, FB, LX
Maximum Junction Temperature Range
Storage temperature range
Operating Junction Temperature Range
Rating
2.5
300
-0.3 to +5.5
-0.3 to VIN +0.3
+150
-65 to +150
-40 to +125
Unit
KV
V
V
V
o
C
o
C
o
C
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only and functional
operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to
absolute-maximum-rated conditions for extended periods ma affect device reliability.
AP6015 Rev. 3
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AP6015
High Efficiency Step-Down Low Power DC-DC Converter
Recommended Operating Conditions
Symbol
TA
VIN
VO
L
Ci
Co
Notes:
(TA :-40~85°C)
Parameter
Operating Ambient Temperature Range
Supply Voltage
Output voltage range for adjustable output voltage version
Inductor (see Note 4)
Input capacitor (see Note 4)
Output capacitor (see Note 4) VO ≥ 1.8V
Rating
-40 to +85
2.0 to 5.5
0.8 to VI
3.3
10
10
Unit
o
C
V
V
μH
μF
μF
4. Refer to application section for further information.
Electrical Characteristics
(TA =25°C)
Over recommended operating free-air temperature range, VI=3.6V, VO=2.5V, IO=300mA, EN=VIN. (unless otherwise noted)
Symbol
Parameter
Conditions
Min
Typ.
Max
IO= 0mA to 800mA
2.5
-
5.5
IO= 0mA to 500mA
2
-
5.5
IO= 0mA to 600mA
2.5
IO= 0mA to 400mA
2
-
-
Unit
Supply current
o
-20 to 85 C
VIN
Input Voltage range
o
-40 to 85 C
5.5
V
Iccq
Operating quiescent current
IO= 0mA
-
150
-
μA
ISTBY
Standby current
EN= GND
-
0.1
1
μA
VIN≤ 3V
1.5
-
-
VIN> 3V
2.5
-
-
-
-
0.7
V
-
0.01
0.1
μA
1.2
1.6
1.95
V
Enable
VIH
EN high-level input voltage
VIL
EN low-level input voltage
IL
EN input leakage current
V(UVLO)
EN= GND or VIN
Under-voltage-lockout-threshold
AP6015 Rev. 3
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AP6015
High Efficiency Step-Down Low Power DC-DC Converter
Electrical Characteristics
(Continued)
Over recommended operating free-air temperature range, VI=3.6V, VO=2.5V, IO=300 mA, EN=VIN. (unless otherwise noted)
Symbol
Parameter
Power switch and current limit
Conditions
VI=VGS=3.6V; I=200mA
VI=VGS=2V; I=200mA
P-channel leakage current
VDS=5.5V
RDS(on)
VI=VGS=3.6V; IO=200mA
N-channel MOSFET on-resistance
VI=VGS=2V; IO=200mA
N-channel leakage current
VDS=5.5V
I(LIM)
P-channel current limit
2.5V≤VI≤5.5V
Power good output (see Note 5)
P-channel MOSFET on-resistance
V(PG)
Power good threshold
Feedback voltage falling
Min
Typ.
Max
200
200
1200
280
480
280
500
-
410
1
410
1
1600
88%
VO
Power good hysteresis
VOL
PG output low voltage
ILKG
PG output leakage current
Minimum supply voltage for valid
power good signal
Oscillator
FS
Oscillator frequency
Output
VO
Adjustable output voltage range
VREF
Reference voltage
AP6015-Adj
AP6015-1.8V
VO
Fixed output
voltage
(see Note 6)
AP6015-2.5V
AP6015-3.3V
Line regulation
Load regulation
η
Efficiency
Start-up time
θJA
θJC
Notes:
Thermal Resistance
Junction-to-Ambient
Thermal Resistance
Junction-to-Case
V(FB)=0.8×VO nominal;
I(sink)=10μA
V(FB)=VO nominal
-
Unit
mΩ
μA
mΩ
μA
mA
92% 94%
VO
VO
2.5% VO
V
-
0.3
V
0.01
1
μA
1.2
-
-
V
800
1000
1200
KHz
0.8
0.784
0.8
5.5
0.816
V
V
VI=2.5V to 5.5V;
0mA ≤ IO ≤ 800mA
－3%
-
4%
10mA ≤ IO ≤ 800mA
VI=2.7V to 5.5V;
0mA ≤ IO ≤ 800mA
10mA ≤ IO ≤ 800mA
VI=3.6V to 5.5V;
0mA ≤ IO ≤ 800mA
10mA ≤ IO ≤ 800mA
VI= VO ＋0.5V (min.2V)
to 6.0V; IO=10mA
VI=5.0V;
IO=10mA to 800mA
VI=5V; VO=3.3V; IO=300mA
VI=3.6V; VO=2.5V; IO=200mA
IO=0mA, time from
active EN to VO
－3%
-
3%
－3%
-
4%
－3%
-
3%
－3%
-
4%
－3%
-
3%
0.4
V
0.3
%/V
0.8
%
94
%
1
4
ms
MSOP-10L (Note 7)
161
o
C/W
MSOP-10L (Note 7)
39
o
C/W
5. Power good is not valid for the first 100μs after EN goes high. Please refer to the application section for more information.
6. The output voltage accuracy includes line and load regulation over the full temperature range.
7. Test condition for MSOP-10L: Device mounted on 2oz copper, minimum recommended pad layout on top & bottom layer with thermal vias,
double sided FR-4 PCB
AP6015 Rev. 3
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AP6015
High Efficiency Step-Down Low Power DC-DC Converter
Typical Application Circuit
For best transient response we suggest that RCC, CCC and L1 values as below.
RCC
CCC
L1-WURTH
VIN < 3.0V, VOUT < 2.5V
200KΩ
33PF
1.8µH
68KΩ
100PF
1.8µH
VIN ≥ 3.0V, VOUT < 2.5V
82KΩ
100PF
3.3µH
VIN ≥ 3.0V, VOUT ≥ 2.5V
C1, C2 (MLCC)
10µF
10µF
10µF
(1) ADJ Output
VI 3.0 V to 5.5 V 1
PVCC
LX
9
VCC
FB
5
PG
4
L1
VO 2.5 V/800 mA
100 Ohm
2
8
AP6015
EN
C1
10µF
C3
1µF
R3
680K
R1
Power Good
PGND 10
CC
6
Rcc
GND
3
C2
10µF
R2
C CC
100pF
R2: Suggest to be 39K~100K because of stability reasons.
VO = VREF × (1 +
R1
)
R2
Typical Application Circuit for Adjustable Output Voltage Option
(2) FIXED Output
Typical Application
1 PVCC
VI 5 V
LX
9
L1
VO 1.8/ 2.5/ 3.3V/ 800mA
100 Ohm
2
C1
10uF
8
VCC
FB
AP6015
EN
C3
1uF
GND
3
PG
5
4
R3
680K
Power Good
C2
10uF
PGND 10
CC
6
Rcc
CCC
100pF
Standard 5 V to 1.8/ 2.5/ 3.3V/ 800mA Conversion; High Efficiency
AP6015 Rev. 3
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AP6015
High Efficiency Step-Down Low Power DC-DC Converter
Typical Operating Characteristics
Supply Current vs. Tem perature
(Vcc=3.6V Vout=2.5V)
250
250
200
200
Supply Current (uA)
Supply Current (uA)
Input Voltage vs. Supply Current
150
100
50
150
100
50
Vout=0.8V
Vout=1.8V
0
2
2.5
3
3.6
4
4.5
5
0
-40
5.5
-25
Input Voltage (V)
50
Figure 1
Figure 2
Stand-by Current vs. Input Voltage
Stand-by Current vs. Tem perature
(Vcc=3.6V)
85
1.2
0.1
1
0.08
Stand-by Current (uA)
Stand-by Current (uA)
0
25
Tem perature (℃ )
0.06
0.04
0.02
0.8
0.6
0.4
0.2
0
0
2
2.5
3
3.6
4
4.5
5
5.5
Input Voltage (V)
-25
0
25
50
85
Tem perature (℃)
Figure 3
AP6015 Rev. 3
-40
Figure 4
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AP6015
High Efficiency Step-Down Low Power DC-DC Converter
Typical Operating Characteristics
(Continued)
Load Regulation
(Vcc=5.0V Vout=2.5V)
2.55
2.55
2.54
2.54
2.53
2.53
Output Voltage (V)
Output Voltage (V)
Line Regulation
(Vout=2.5V Iout=10m A)
2.52
2.51
2.5
2.49
2.48
2.52
2.51
2.5
2.49
2.48
2.47
2.47
2.46
2.46
2.45
3.0V
2.45
3.6
4
4.5
5
10
5.5
100
Input Voltage (V)
Figure 5
800
Figure 6
Frequency vs. Tem perature
(Vcc=3.6V Vout=2.5V)
UVLO vs. Tem perature
1050
1.8
1000
1.72
950
1.64
UVLO (V)
Frequency (KHz)
200
400
600
Output Current (m A)
900
1.56
850
1.48
800
750
-40
-25
0
25
50
85
1.4
-40
Temperature (℃)
0
25
50
85
Tem perature ( ℃ )
Figure 7
AP6015 Rev. 3
-25
Figure 8
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AP6015
High Efficiency Step-Down Low Power DC-DC Converter
Typical Operating Characteristics
(Continued)
Efficiency vs. Load Current
(Vcc=3.6V Vout=2.5V)
100
100
90
90
80
80
70
70
Efficiency (%)
Efficiency (%)
Efficiency vs. Load Current
(Vcc=3.6V Vout=1.8V)
60
50
40
30
60
50
40
30
20
20
10
10
0
0
0
100 200 300 400 500 600 700 800
Load Current (mA)
100 200 300 400 500 600 700 800
Load Current (m A)
Figure 9
Figure 10
Efficiency vs. Load Current
(Vcc=5.0V Vout=2.5V)
Efficiency vs. Load Current
(Vcc=5.0V Vout=3.3V)
100
100
90
90
80
80
70
70
Efficiency (%)
Efficiency (%)
0
60
50
40
30
60
50
40
30
20
20
10
10
0
0
0
100 200 300 400 500 600 700 800
Figure 11
AP6015 Rev. 3
0
100 200 300 400 500 600 700 800
Load Current (mA)
Load Current (m A)
Figure 12
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AP6015
High Efficiency Step-Down Low Power DC-DC Converter
Typical Operating Characteristics
(Continued)
Dropout Voltage vs. Load Current
(Vout=3.3V)
400
400
350
350
Dropout Voltage (mV)
Dropout Voltage (mV)
Dropout Voltage vs. Load Current
(Vout=2.5V)
300
250
200
150
100
50
300
250
200
150
100
50
0
0
0
100 200 300 400 500 600 700 800
Load Current (mA)
AP6015 Rev. 3
0
100 200 300 400 500 600 700 800
Load Current (mA)
Figure 13
Figure 14
Output Ripple
Output Ripple
Figure 15
Figure 16
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AP6015
High Efficiency Step-Down Low Power DC-DC Converter
Typical Operating Characteristics
(Continued)
Load Transient Response
Load Transient Response
Figure 17
Figure 18
Load Transient Response
Load Transient Response
Figure 19
Figure 20
AP6015 Rev. 3
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AP6015
High Efficiency Step-Down Low Power DC-DC Converter
Application Information
„
Enable (EN)
When EN is on logic low, the AP6015 goes into shutdown mode. In shutdown, all other functions are turned
off. The supply current is reduced to 1uA (Typ.).
„
Soft Start
As the enable pin goes high, the soft-start function generates an internal voltage ramp. This causes the
start-up current to slowly raise preventing output voltage overshoot and high inrush currents. The soft-start
duration is typical 1mSec.
AP6015 START-UP
TIME
„
Under Voltage Lock Out (UVLO)
The UVLO prevents the converter from turning on when the voltage on VCC is less than typically 1.6V.
3.6V Vcc
1.6V UVLO
0V
2.5V Vout
0V
AP6015 Rev. 3
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AP6015
High Efficiency Step-Down Low Power DC-DC Converter
Application Information
„
Power Good
(Continued)
(PG)
The PG comparator has an open drain output capable of sinking typically 10mA. The PG is only active when
the AP6015 is enable (EN=high). When the AP6015 is disable (EN=low), the PG pin is high impedance.
If the PG pin is connected to the output of the AP6015 with a pull-up resistor, no initial spike occurs and
precautions have to be taken during start-up.
The PG pin becomes active high when the output voltage exceeds typically 92% of its nominal value. Leave
the PG pin unconnected when not used.
PG Sink Current vs. ExteranI Voltage
PG Sink Current (mA)
25
20
15
10
5
0
2
2.5
3
3.6
4
4.5
5
5.5
External Voltage (V)
AP6015 Rev. 3
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High Efficiency Step-Down Low Power DC-DC Converter
Application Information
(Continued)
„
Inductor Selection
In order to avoid saturation of the inductor, the inductor should be rated at least for the maximum output
current plus the inductor ripple current which is calculated as:
VO
)
VCC
ΔI L = VO ×
L× f
1− (
I L ( MAX ) = I O ( MAX ) +
ΔI L
2
Where:
f= Switching frequency (1MHz typical)
L = Inductor value
△IL = Peak-to-peak inductor ripple current
IL(max) = Maximum inductor current
Vcc=3.6V Vout=2.5V f=1MHz
Î△IL≒230mA
AP6015 Rev. 3
L=3.3uH
Vcc=3.6V Vout=2.5V
f=1MHz
L=1.8uH
Î△IL≒360mA
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AP6015
High Efficiency Step-Down Low Power DC-DC Converter
Application Information
(Continued)
„
Input Capacitor Selection
Though there is no special requirement for the ESR (Equivalent Series Resistance) of the input capacitor, due
attention should be paid to the tolerance and temperature coefficient of the capacitor used. A 10uF or larger
capacitance is required between the PVCC and the GND pins. The input capacitor should be placed as
close as possible to the PVCC pin in order to achieve good overall system performance.
„
Output Capacitor Selection
Ripple at the voltage output pin is caused by the charge-and-discharge of the output capacitor. For the best
performance, a low ESR output capacitor should be used. The equation below demonstrates how the size of
the ripple can be calculated.
VO
)
VCC
1
1
×(
+ ESR) = ΔI L × (
+ ESR)
ΔVO = VO ×
L× f
8 × CO × f
8 × CO × f
1− (
Where:
△Vo= Output voltage ripple
L = Inductor value
f = Switching frequency (1MHz typical)
△IL = Peak-to-peak inductor ripple current
AP6015 Rev. 3
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AP6015
High Efficiency Step-Down Low Power DC-DC Converter
Application Information
(Continued)
„
Layout Considerations
A good board layout practice can significantly improve the stability of the application circuit and reduce the
system noise. The feedback path must be as short as possible. The input capacitor and bypass capacitor
must be placed close to the PVCC and the VCC pins for optimal performance. It is recommended that the
ground planes for System Ground / Power Ground / Analog Ground are isolated from each others, while they
should all be joined together at a common point. An example drawing of a circuit with good ground noise
performance is shown below.
1
VI
LX
PVCC
9
L1
VO
100 Ohm
2
C1
10µF
C3
1µF
8 EN
10
FB 5
VCC
AP6015
R3
680K
R1
PG 4
PGND
GND CC
3
6
Power Good
C2
10 uF
R2
Rcc
C CC
100 pF
The external inductor must be placed as close as possible to the switching node, i.e. the LX pin. The copper
traces on the pcb, where high peak switching current may flow through, should be kept ‘wide’ and ‘short’.
This results in low inductance and capacitance in the current path, hence ground shift problem is avoided and
system stability stay within bound.
AP6015 Rev. 3
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High Efficiency Step-Down Low Power DC-DC Converter
Marking Information
( Top View )
9
10
8
Logo
7
6
A~Z : Green
Y : Year : 0~9
W : Week : A~Z : 1~26 week;
a~z : 27~52 week; z represents
52 and 53 week
YWX
6015XX
Part Number
XX : 18 for 1.8V
25 for 2.5V
33 for 3.3V
Blank for ADJ
2
1
3
4
5
MSOP-10L
Package Information
(All Dimensions in mm)
(1) Package type: MSOP-10L
10x-0.30
4.4
4.8/5.0
2.95/3.05
1
1
0.75/0.95
1.10Max.
0.5Typ.
Seting plane
C
Gauge plane
0.4/0.7
AP6015 Rev. 3
"A"
0.25
C
1
Land Pattern Recommendation
(Unit:mm)
0° / 8
°
0.10
2.95/3.05
0.05/0.15
0.1/0.2
0.17/0.27
10x-1.4
8x-0.50
DETAIL "A"
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AP6015
High Efficiency Step-Down Low Power DC-DC Converter
IMPORTANT NOTICE
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further
notice to any product herein. Diodes Incorporated does not assume any liability arising out of the application or use of any product described herein; neither
does it convey any license under its patent rights, nor the rights of others. The user of products in such applications shall assume all risks of such use and will
agree to hold Diodes Incorporated and all the companies whose products are represented on our website, harmless against all damages.
LIFE SUPPORT
Diodes Incorporated products are not authorized for use as critical components in life support devices or systems without the expressed written approval of the
President of Diodes Incorporated.
AP6015 Rev. 3
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