AL2010

[AL2010]
AL2010
Current-Mode PWM Step-Down DC-DC Convertor
GENERAL DISCRIPTION
AL2010 is the Current-Mode Synchronous Step-Down DC-DC Convertor which offers excellent transient
response. Output voltage is selectable between 0.8V and 5.0V by the external resister. Input voltage range is
between 3.0V and 5.5V, and it is the most suitable to generate 1.0V, 1.2V, and 1.8V. Power MOSFETs are built
in AL2010, which is maximum current is 2.5A. The switching frequency is selectable between 300 kHz and 4
MHz by the external resister. For the protections, AL2010 has Over-Current protection, Low-Input Voltage
protection, and Power-Good function.
FEATURE
 Step Down DCDC Converter
・Input Voltage Range: 3.0V to 5.5V
・Output Voltage Range: 0.8V to 5.0V (by the external resister)
・Maximum Output Load Current: 2.5A
・Operation Temperature: -40°C to 85°C
・Switching Frequency: 300kHz to 4MHz (Selectable by an external resister. And Available External
Synchronous Mode by the external clock)
・Low Input Voltage Protection
・Power-Good Function
・Over-Current Protection (Automatic recovery type)
・Thermal Protection
・Internal Reference Voltage: ±1.5% (Ta = 25 °C)
・Maximum Duty: 100%
・Soft Start Function
・PKG: HTSSOP-16
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BLOCK DIAGRAM
SS
1V
SS_END
+
Iss+
SS
VIN
+
0.6V
-
Iss-
UVLOcomp
Enable
PWON
0.6V× 1.3
OVPcomp
+
-
VS+
VS-
0.6V×SS
+
Reset
Reset
-
FB
+
Set
0.6V
FB
+
-
FBamp
+
Vcnt.
-
0.6V
Reset
+
iRAMP
PWM.comp
Control Logic
CC
OSC
OSC
OCLcomp
FSYN
VIN
VS+
+
A
-
VS-
VIN
0.6V×0.75
-
SW
+
-
0.6V×1.25
+
GND
PWGDcomp
PWGD
Figure 1. AL2010 Block Diagram
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[AL2010]
Pin Location & TYPICAL OPERATION CIRCUIT
1
2
L1
3
Vout
A
C3
5
4
6
A
D1
R2
C1
R1
B
PWGD
VIN
SYNC
FSYN
SW
PWON
PWON
C4
AL2010
PWGD
RT
R3
SGND
C
Title
SS
Size
Number
C5
R5
R4
D
1
2
B
Date:
File:
Vin
B
SW
PGND
PGND
C
SW
CC
SW
FB
VIN
Revision
2010/03/01
Sheet of
C:\Documents and Settings\..\AL2010_100301.SCHDOC
Drawn By:
3
4
5
C2
D
6
Figure 2. Pin Location (Top View)
PIN & FUNCTION
No.
1
2
3
4
5
6
7
8
Pin Name
PWGD
FSYN
PWON
RT
SGND
SS
CC
FB
Function
Power-Good
External Synchronous Clock Input
Power-On
Frequency Setting
Signal Ground
Soft Start
Output of Feedback Amplifier
Feedback Input
No.
9
10
11
12
13
14
15
16
015016277-E-01
Pin Name
VIN
SW
SW
PGND
PGND
SW
SW
VIN
Function
Supply Input
Switching Node Output
Switching Node Output
Power Ground
Power Ground
Switching Node Output
Switching Node Output
Supply Input
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[AL2010]
ABSOLUTE MAXIMUM RATING
(Gnd=0V; Note 1)
Parameter
VIN pin
SW pin
All pins (Except SW pin, VIN pin)
Junction Temperature
Operating Ambient Temperature
Storage Ambient Temperature
Power Dissipation (Ta = 25°C)
Note1. All voltages with respect to ground.
Symbol
VIN
VSW
VIND
TJ
TA
TSTG
Pd
Min
−0.3
−0.3
−0.3
−40
−40
Max
6.0
Vin + 0.3
Vin
125
85
150
2000
Units
V
V
V
°C
°C
°C
mW
WARNING: Operation at or beyond these limits may result in permanent damage to the device.
Normal operation is not guaranteed at these extremes.
RECOMMENDED OPERATING CONDITIONS
(Gnd=0V)
Parameter
Symbol
Min
Typ
Max
Units
VIN pin voltage
Vin
3.0
−
5.5
V
Output Current
Iout
0
−
2.5
A
Operating Ambient Temperature
Ta
−40
−
85
°C
*AKM assumes no responsibility for the usage beyond the conditions in this datasheet.
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ELECTRICAL CHARACTERISTICS
Parameter
Operating Input Voltage Range
Feedback REF Voltage
Operation Current Consumption
Stand-by Current
Load Regulation *1
MOSFET RDS(ON)
Over-Current Detection
Oscillator Frequency
FSYN Input Frequency Range
Oscillator Accuracy
Maximum ON Duty
UVLO
UVLO Return Voltage
UVLO (Hysteresis)
Output Over Voltage Detection
Charge Current (to Capacitor
of Soft Start)
Discharge Current (to Capacitor
of Soft Start)
Thermal Protection Detection *2
Thermal Protection Hysteresis *2
Power Good Detection
Power Good non-Detection
Power Good Hysteresis
Power-ON Threshold
Power-OFF Threshold
Power-ON Hysteresis
gm (CC pin)
(Vin=5.0V, Ta=25°C, unless otherwise specified)
Conditions
Min
Typ
Max
Units
Symbol
Vin
VFB ref
ISUULY
Istandby
∆VLOAD
Rpmos
Rnmos
Ioclpeak
fosc
Fext300
Fext2000
facu
MAXDuty
Vuvlo
Vuv_hys
Vovp
Iss+
Iss-
RT=702kΩ~47kΩ
RT=702kΩ (at 300kHz)
RT=100kΩ (at 2MHz)
RT=100kΩ (at 2MHz)
*2
Voltage at Lock
Voltage at Release
UVLO Hysteresis Width
against VFB ref
Css=0V → 1.0V (at rise)
3.0
591
0.48
10
10
3.15
300
240
1600
-20
2.30
2.36
0.06
+26
18.0
600
0.8
1
65
65
4.5
0
2.50
2.70
0.20
+30
20.0
5.5
609
1.12
10
100
100
4000
360
2400
20
100
2.84
2.90
+34
22.0
V
mV
mA
µA
%
mΩ
mΩ
A
kHz
kHz
kHz
%
%
V
V
V
%
µA
Css=1.0V → 0.40V (at fall)
0.75
1.0
1.25
µA
±16
±21
±3
1.5
50
400
150
15
±20
±25
±5
100
500
±24
±29
±7
0.4
150
600
°C
°C
%
%
%
V
V
mV
µS
No Switching
Power-Off
0~2A
PMOS RDS(ON)
NMOS RDS(ON)
against VFB
against VFB
ref
ref
Vponl
Vponh
*1. For reference value by the recommended circuit
*2. Guaranteed by design and characterization
DC CHARACTERISTICS
Parameter
FSYN(Input pin) Threshold
Voltage
PWGD(Output pin) Voltage
Symbol
VEih
VEil
VPoh
VPol
Condition
Ipoh=-100µA
Ipol=100µA
015016277-E-01
(Ta=25°C, unless otherwise specified)
Min
Typ
Max
Units
0.7*VDD
V
−
−
0.3*VDD
V
−
−
VDD-0.4
V
−
−
0.4
V
−
−
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[AL2010]
RECOMMENDED CIRCUITRY & PCB LAYOUT
IC1
PWGD
1
FSYN
2
PWGD
VIN
FSYN
SW
16
Vin
GND1
C1
15
GND2
3
PWON
4
PWON
SW
RT
PGND
SGND
PGND
14
13
L1
R3
Vout
5
12
D1
C4
6
SS
SW
CC
SW
FB
VIN
R1
C3
11
C5
R2
R4
7
10
R5
8
9
C2
Figure 3. One Example of Recommended Circuitry
Figure 4. PCB LAYOUT
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[AL2010]
PIN DISCRIPTION
1 pin_PWGD:
Power-Good pin. When the output voltage achieved to
±20% of set voltage, this pin becomes “Hi”.
2 pin_FSYN:
External Synchronous Clock Input pin. Internal pull-up
resistor is 300kΩ. The external clock within ±20% of
relative value is available, which is to the internal clock,
and it is set by the resistor at RT pin.
3 pin_PWON:
Power-ON pin. It starts in the voltage which is 1.5V and
more.
4 pin_RT:
The setup pin of operation frequency. It is the setup by a
resistor.
5 pin_SGND:
Signal Ground pin.
7 pin_CC:
Output pin of Output Voltage Feedback Amplifier. A
resistor and a capacitor are placed in a parallel
connection, and those are connected between CC pin and
Vref/SS pin. And those compensate a phase of an
amplifier.
8 pin_FB:
Input pin of Output Voltage Feedback Amplifier. The
voltage is controlled so that this pin voltage becomes
0.6V. Two resistors for the feedback should be placed in
a series between the output stage and GND, and the
connected point of two should be connected to FB pin.
9 pin, 16pin_VIN:
Input pin of Main Power Voltage. A capacitor should be
placed between VIN pin and GND, which is 4.7uF and
more.
10 pin, 11 pin, 14 pin, 15 pin_SW:
Output pin of the internal switching MOSFET.
6 pin_SS:
Soft Start pin. It should connect the capacitor of 0.047uF
and more between SS pin and GND. It charges an external
capacitor at the time of startup, and Soft Start works. And,
when the AL2010 is in the protection state of over current,
the external capacitor is discharged and it makes the stop
time in a hiccup operation.
12 pin, 13 pin_PGND:
Power Ground pin.
Protection Feature Description
Thermal Protection (TSD: Thermal Shutdown)
The chip temperature is monitored, and the built-in P-channel MOSFET and the built-in N-channel MOSFET are stopped
when the chip temperature becomes about 150°C. The thermal protection function discharges electrical charge of the SS
pin at this time, therefore a recovery sequence from the thermal protection is always in a soft start operation. This function
has a hysteresis, and the AL2010 is restarted by soft start when the chip temperature decreases 15°C from the thermal
shutdown threshold.
Prevention of Incorrect Operation in Low Voltage (UVLO: Under Voltage Lock Out)
When the V5 pin voltage becomes less than 2.5V by a main power supply voltage decrease, all circuit blocks in the
AL2010 are stopped and the AL2010 becomes UVLO state. The UVLO state has hysteresis, and the AL2010 keeps UVLO
state until the main power supply voltage rises again and exceeds 2.7V. When the UVLO state is released, the AL2010
restarts by a soft start operation.
Output Over-Voltage Protection (OVP)
When the output voltage becomes +30% or more of the setting value, the built-in P-channel MOSFET and the built-in
N-channel MOSFET become OFF state and the AL2010 enters protection mode. This state is maintained until the built-in
P-channel MOSFET is turned on by the FB amplifier. The AL2010 is in normal operation when recovering from the output
over-voltage protection. It does not shift to soft-start mode.
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[AL2010]
TIMING CHART AT START-UP
Vin
PWON/MODE
Vref
50%
Vref/SS
Vout
100%
50%
OCLレベル
OCL
Level
0%
130%
100%
OVP
Level
OVPレベル
0%
OCL&OVP
Control
OCL&OVP制御
PWM
PWM制御
Control
SS_END
Figure 5. Start Up Timing
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[AL2010]
TIMING CHART AT OVER CURRENT PROTECTION
T2
T1
T3
T4
1.0V
0.4V
SS
100%
OCLレベル
OCL
Level
0%
OCL
Counter
OCLカウント
Css Discharge time
Cssディスチャージ時間確保
OCL Timer
OCLタイマー
When Css=0.1uF, T1: Soft Start Time is 5ms, T3: Rest Time is 60ms,
T2: 256us(512 clocks/2MHz)、T4:192us(384 clock/2MHz)
When Css=0.22uF, T1: Soft Start Time is 11ms, T3: Rest Time is132ms
Figure 6. Over Current Protection Timing
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[AL2010]
TIMING CHART BY EXTERNAL SYNCHRONOUS
変化なし
Fixed
変化なし
11 :: 22
変化
Un-Fixed
変化
Internal Clock
内部クロック
(1)
内部クロック優先
Vth > 0.4V
0.4V
FSYN
SW
(2)
外部クロック優先
(1) When the period of “FSYN=Hi” is longer than one cycle of Internal Clock, the operation clock is according to Internal Clock.
(2) When the period of “FSYN=Hi” is shorter than one cycle of Internal Clock, the operation clock is according to External Clock.
VIN
VIN
300kΩ
10kΩ
FSYN
Gate Input
ゲート入力
External
外部同期信号
Synchronous
Clock
オープンコレクタ
It must be less than 0.4V.
AL2010内部
または
オープンドレイン
The external clock which is as the relative value within ±20%
0.4V以下必須
of the internal clock frequency which depends on the resistor
of RT pin can be inputted to AL2010.
Figure 7. External Synchronous Timing
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[AL2010]
CHARACTERISTIC EXAMPLE
100
100
90
90
80
80
70
Efficiency[%]
Efficiency[%]
70
60
50
40
30
60
50
40
30
20
20
10
0
0.0
0
0.0
0.5
1.0
1.5
2.0
Vin=4.5[V]
Vin=5.0[V]
Vin=5.5[V]
10
Vin=4.5[V]
Vin=5.0[V]
Vin=5.5[V]
0.5
1.0
1.5
2.0
2.5
Outpur Current[A]
2.5
Output Current[A]
Vin=5V Vout=1.8V f=2.2MHz
Vin=5V Vout=1.5V f=2.0MHz
Figure 8. Characteristic Example
MARKING
AL2010
XXXXU
1)
2)
3)
Pin #1 indication
Date Code : XXXXU (5 digits)
XXXX : Date Code
U
: System Code
Marketing Code : AL2010
Figure 9. Package Marking (Top View)
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[AL2010]
PACKAGE INFORMATION
16pin HTSSOP(Unit:mm)
Figure 10. Package Dimensions
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[AL2010]
Revision History
Date (YY/MM/DD)
15/12/1
Revision
01
Page
-
Contents
First Edition
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[AL2010]
IMPORTANT NOTICE
0. Asahi Kasei Microdevices Corporation (“AKM”) reserves the right to make changes to the information contained in
this document without notice. When you consider any use or application of AKM product stipulated in this document
(“Product”), please make inquiries the sales office of AKM or authorized distributors as to current status of the
Products.
1. All information included in this document are provided only to illustrate the operation and application examples of
AKM Products. AKM neither makes warranties or representations with respect to the accuracy or completeness of the
information contained in this document nor grants any license to any intellectual property rights or any other rights of
AKM or any third party with respect to the information in this document. You are fully responsible for use of such
information contained in this document in your product design or applications. AKM ASSUMES NO LIABILITY
FOR ANY LOSSES INCURRED BY YOU OR THIRD PARTIES ARISING FROM THE USE OF SUCH
INFORMATION IN YOUR PRODUCT DESIGN OR APPLICATIONS.
2. The Product is neither intended nor warranted for use in equipment or systems that require extraordinarily high levels
of quality and/or reliability and/or a malfunction or failure of which may cause loss of human life, bodily injury, serious
property damage or serious public impact, including but not limited to, equipment used in nuclear facilities, equipment
used in the aerospace industry, medical equipment, equipment used for automobiles, trains, ships and other
transportation, traffic signaling equipment, equipment used to control combustions or explosions, safety devices,
elevators and escalators, devices related to electric power, and equipment used in finance-related fields. Do not use
Product for the above use unless specifically agreed by AKM in writing.
3. Though AKM works continually to improve the Product’s quality and reliability, you are responsible for complying
with safety standards and for providing adequate designs and safeguards for your hardware, software and systems
which minimize risk and avoid situations in which a malfunction or failure of the Product could cause loss of human
life, bodily injury or damage to property, including data loss or corruption.
4. Do not use or otherwise make available the Product or related technology or any information contained in this
document for any military purposes, including without limitation, for the design, development, use, stockpiling or
manufacturing of nuclear, chemical, or biological weapons or missile technology products (mass destruction weapons).
When exporting the Products or related technology or any information contained in this document, you should comply
with the applicable export control laws and regulations and follow the procedures required by such laws and
regulations. The Products and related technology may not be used for or incorporated into any products or systems
whose manufacture, use, or sale is prohibited under any applicable domestic or foreign laws or regulations.
5. Please contact AKM sales representative for details as to environmental matters such as the RoHS compatibility of the
Product. Please use the Product in compliance with all applicable laws and regulations that regulate the inclusion or use
of controlled substances, including without limitation, the EU RoHS Directive. AKM assumes no liability for damages
or losses occurring as a result of noncompliance with applicable laws and regulations.
6. Resale of the Product with provisions different from the statement and/or technical features set forth in this document
shall immediately void any warranty granted by AKM for the Product and shall not create or extend in any manner
whatsoever, any liability of AKM.
7. This document may not be reproduced or duplicated, in any form, in whole or in part, without prior written consent of
AKM.
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