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AP7331
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT LOW DROPOUT LINEAR REGULATOR Description
The AP7331 is a 300mA, adjustable and fixed output voltage, low dropout linear regulator. The device included pass element, error amplifier, band-gap, current limit and thermal shutdown circuitry. The device is turned on when EN pin is set to logic high level. The characteristics of low dropout voltage and low quiescent current make it suitable for low power applications, for example, battery powered devices. The typical quiescent current is approximately 65A. Built-in current-limit and thermal-shutdown functions prevent IC from damage in fault conditions. The AP7331 is available in SOT25 and DFN2020-6 packages.
Pin Assignments
SOT25 (Fixed Output)
(Top View)
IN 1 GND 2 EN 3 4 NC 5 OUT
SOT25 (ADJ Output)
(Top View)
DFN2020-6 (Fixed Output)
(Top View)
EN 1 GND 2 IN 3 6 NC 5 NC 4 OUT
DFN2020-6 (ADJ Output)
(Top View)
EN 1 GND 2 IN 3 6 ADJ 5 NC 4 OUT
Features
* * * * * * * * * * * * * * * *
Applications
* * * *
300mA Low Dropout Regulator with EN Very low IQ over full load: 65A Wide input voltage range: 2V to 6V Wide adjustable output: 0.8V to 5.0V Fixed output options: 1.0V to 3.3V PSRR: 65dB typical at 100Hz Fast start-up time: 80s Stable with low ESR, 1F ceramic output capacitor Excellent Load/Line Transient Response Low dropout: 300mV typical at 300mA Current limit protection Short circuit protection Thermal shutdown protection Ambient temperature range: -40C to 85C SOT25 and DFN2020-6: Available in "Green" Molding Compound (No Br, Sb) Lead Free Finish/RoHS Compliant (Note 1)
XDSL Routers Wireless LAN Cards Desktop and Notebook Computers Battery Powered Equipments
Notes:
1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html
AP7331
Document number: DS31914 Rev. 3 - 2
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AP7331
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT LOW DROPOUT LINEAR REGULATOR Typical Application Circuit
VIN
IN AP7331 1uF Enable 1uF EN GND
1uF Enable EN GND ADJ R2
VOUT
OUT
VIN
IN AP7331 OUT
VOUT
R1 1uF
Fixed Output
Adjustable Output
R VOUT = VREF 1 + 1 R2
Pin Descriptions
Pin Name IN GND EN ADJ NC OUT SOT25 (fixed) 1 2 3 4 5 Pin Number DFN2020-6 SOT25 (fixed) (adj) 3 2 1 5, 6 4 1 2 3 4 5 DFN2020-6 (adj) 3 2 1 6 5 4 Description Voltage input pin. Bypass to ground through at least 1F capacitor Ground Enable input, active high Output feedback pin No connection Voltage output pin. Bypass to ground through 1F ceramic capacitor
Functional Block Diagram
IN
Current Limit and Thermal Shutdown
OUT
IN
Current Limit and Thermal Shutdown
OUT
EN
Gate Driver
R
EN
Gate Driver
ADJ
0.4V
R
0.4V
GND
GND
Fixed Version
Adjustable Version
AP7331
Document number: DS31914 Rev. 3 - 2
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AP7331
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT LOW DROPOUT LINEAR REGULATOR Absolute Maximum Ratings
Symbol ESD HBM Parameter Human Body Model ESD Protection Ratings 6 Units kV
ESD MM VIN
TOP TST PD TJ
Machine Model ESD Protection Input Voltage EN Voltage Continuous Load Current Operating Junction Temperature Range Storage Temperature Range Power Dissipation (Note 2) Maximum Junction Temperature SOT25 DFN2020-6
400 7 VIN + 0.3 Internal Limited -40 ~ 125 -65 ~150 640 740 150
V V V C C mW mW C
Recommended Operating Conditions
Symbol VIN IOUT TA
Notes:
Parameter Input voltage Output Current (Note 3) Operating Ambient Temperature
Min 2 0 -40
Max 6 300 85
Unit V mA C
2. Ratings apply to ambient temperature at 25C 3. The device maintains a stable, regulated output voltage without a load current.
AP7331
Document number: DS31914 Rev. 3 - 2
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AP7331
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT LOW DROPOUT LINEAR REGULATOR Electrical Characteristics
(TA = 25oC, VIN = VOUT +1V, CIN = 1uF, COUT = 1uF, VEN = 2V, unless otherwise stated) Symbol Parameter Test Conditions VEN = VIN, IOUT = 0mA IQ Input Quiescent Current VEN = VIN, IOUT = 300mA ISHDN Input Shutdown Current VEN = 0V, IOUT = 0mA ILEAK Input Leakage Current VEN = 0V, OUT grounded VDropout Dropout Voltage (Note 4) IOUT = 300mA VREF ADJ Reference Voltage (Adjustable version) IOUT= 0mA IADJ ADJ Leakage (Adjustable version) TA = -40oC to 85oC, VOUT Output Voltage Accuracy IOUT = 30mA VIN = (VOUT +1V) to VIN-Max, VOUT Line Regulation VEN = VIN, IOUT = 1mA /VIN/V VIN = (VOUT +1V) to VIN-Max, VOUT Load Regulation IOUT from 1mA to 300mA /VOUT VEN = 0V to 2.0V, VOUT = 1V, tST Start-up Time IOUT = 300mA VIN = [VOUT +1V]VDC + 0.5VppAC, PSRR PSRR f = 100Hz, IOUT =30mA VIN = VIN-Min to VIN-Max, ISHORT Short-circuit Current VOUT < 0.2V ILIMIT Current Limit VOUT/ROUT = 1A VIL EN Input Logic Low Voltage VIN = VIN-Min to VIN-Max VIH EN Input Logic High Voltage VIN = VIN-Min to VIN-Max IEN EN Input Current VIN = 0V or VIN-Max TSHDN Thermal Shutdown Threshold THYS Thermal Shutdown Hysteresis SOT25 (Note 5) JA Thermal Resistance Junction-to-Ambient DFN2020-6 (Note 6)
Notes:
Min
Typ. 55 65
300 0.4
Max 75 85 1 1 550
Unit
A A A mV V A % %/V % s dB mA
1 2 0.01 0.20 0.6 80 65 100
-2
-0.6
400 1.4 -1
600 0.4 1 140 15 190 167
mA V V A C C o C/W o C/W
4. Dropout voltage is the voltage difference between the input and the output at which the output voltage drops 2% below its nominal value. This parameter only applies to output voltages above 1.8V. 5. Test conditions for SOT25: Device mounted on FR-4 substrate PCB, with minimum recommended pad layout, 2oz copper, single sided 6. Test conditions for DFN2020-6: Device mounted on FR-4 substrate PCB, with minimum recommended pad layout, 2oz copper, double sided, bottom layer is a copper plane.
AP7331
Document number: DS31914 Rev. 3 - 2
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AP7331
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT LOW DROPOUT LINEAR REGULATOR Typical Characteristics
Quiescent Current vs Input Voltage Iload=300mA
62 61
56
Quiescent Current vs Input Voltage Iload=0mA
VOUT = 3.3V 90C
VOUT = 3.3V 90C
Quiescent Current (uA)
54 52 50 48 46 44 42
Quiescent Current (uA)
60 59 58 57 56 55 54 4.3 4.5 4.7 4.9 5.1
-45C 25C C
25C
-45C
5.3
5.5
5.7
5.9
6.1
4.3
4.5
4.7
4.9
5.1
5.3
5.5
5.7
5.9
6.1
Input Voltage (V)
Input Voltage (V)
Reference Voltage vs Input Voltage
0.41
0.1
Line Regulation (% /V)
Output Voltage Variation (%/V)
-45C
Reference Voltage (V)
0.405 0.4 0.395 0.39
0.08
VOUT = 3.3V VIN = VOUT +1V
90C
0.06
0.04
90C 25C
0.385 0.38 4.3 4.5 4.7 4.9 5.1 5.3 5.5 5.7 5.9 6.1
0.02
-45C 25C
4.3 4.5 4.7 4.9 5.1 5.3 5.5 5.7 5.9 6.1
0
Input Voltage (V)
Input Voltage (V)
Load Regulation (% )
0.6
400
Dropout Voltage
VOUT = 3.3V 90C
Output Voltage Variation (%)
0.4 0.2 0 -0.2
VOUT = 3.3V VIN = VOUT + 1V
Dropout Voltage (mV)
350 300 250 200 150 100
25C C
-45C
-0.4 -0.6 0 50 100
25C 90C
-45C
50
150
200
250
300
0 0 50 100 150 200 250 300
Output Current (mA)
Output Current (mA)
AP7331
Document number: DS31914 Rev. 3 - 2
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AP7331
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT LOW DROPOUT LINEAR REGULATOR Typical Characteristics (Continued)
Short Circuit vs Input Voltage
115 110
Current Limit vs Input Voltage
600
VOUT=3.3V
-45C
Current Limit (mA)
550
TA = 25C VOUT = 1.8V
Output Current (mA)
105 100 95 90 85 80 3.5
500
450
25C C
4 4.5
90C
400
5 5.5 6
2.8
3.2
3.6
4
4.4
4.8
5.2
5.6
6
Input Voltage (V)
Input Voltage (V)
PSRR
70 65 60 70
PSRR
VOUT = 1.8V VIN = 2.8V CIN = COUT = 1uF TA = 25C VOUT = 3.3V VIN = 4.3V CIN = COUT = 1uF TA = 25C
65 60
PSRR (dB)
55 50 45 40 35 0.1 1 10 100
PSRR (dB)
55 50 45 40 35 0.1 1 10 100
Frequency (kHz)
Frequency (kHz)
AP7331
Document number: DS31914 Rev. 3 - 2
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AP7331
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT LOW DROPOUT LINEAR REGULATOR Typical Characteristics (Continued)
Start-Up Time (No Load) Start-Up Time (300mA Load)
VEN = 0 to 2V (1V/div) VIN = 4.3V CIN = COUT =1uF
VEN = 0 to 2V (1V/div) VIN = 4.3V CIN = COUT =1uF
VOUT = 3.3V (1V/div)
VOUT = 3.3V (1V/div)
IOUT = 300mA (300mA/div)
Time (50us/div)
Line Transient Response
Time (50us/div)
Line Transient Response
VIN = 5.3V to 4.3V (1V/div) Tf =1 0us
VIN =4.3V to 5.3V (1V/div) Tr = 10us
VOUT = 3.3V (50mV/div)
VOUT = 3.3V (50mV/div)
IOUT = 300mA (300mA/div)
IOUT = 300mA (300mA/div)
Time (50us/div) Load Transient Response
VOUT = 3.3V (100mV/div)
Time (50us/div) Load Transient Response
VOUT = 0.8V (100mV/div)
IOUT = 1mA to 300mA (100mA/div) Tr = Tf = 10us VIN =4.3V
IOUT = 1mA to 300mA (100mA/div) Tr = Tf = 10us VIN = 2V
Time (100us/div) AP7331
Document number: DS31914 Rev. 3 - 2
Time (100us/div)
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AP7331
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT LOW DROPOUT LINEAR REGULATOR Application Note
Input Capacitor
A 1F ceramic capacitor is recommended to connect between VIN and GND pins to decouple input power supply glitch and noise. The amount of the capacitance may be increased without limit. This input capacitor must be located as close as possible to the device to assure input stability and less noise. For PCB layout, a wide copper trace is required for both VIN and GND. A lower ESR capacitor allows the use of less capacitance, while higher ESR type requires more capacitance.
ON/OFF Input Operation
The AP7331 is turned on by setting the EN pin high, and is turned off by pulling it low. If this feature is not used, the EN pin should be tied to IN pin to keep the regulator output on at all time. To ensure proper operation, the signal source used to drive the EN pin must be able to swing above and below the specified turn-on/off voltage thresholds listed in the Electrical Characteristics section under VIL and VIH.
Output Capacitor
The output capacitor is required to stabilize and help transient response for LDO. The AP7331 is stable with very small ceramic output capacitors. The recommended capacitance is from 1F to 4.7F, Equivalent Series Resistance (ESR) is from 10m to 200m, and temperature characteristic is X7R or X5R. Higher capacitance values help to improve load/line transient response. The output capacitance may be increased to keep low undershoot/overshoot. Place output capacitor as close as possible to OUT and GND pins, and keep the leads as short as possible.
Current Limit Protection
When output current at OUT pin is higher than current limit threshold, the current limit protection will be triggered and clamp the output current to approximately 600mA to prevent over-current and to protect the regulator from damage due to overheating.
Short Circuit Protection
When OUT pin is short-circuit to GND or OUT pin voltage is less than 200mV, short circuit protection will be triggered and clamp the output current to approximately 100mA. This feature protects the regulator from overcurrent and damage due to overheating.
Adjustable Operation
The AP7331 provides output voltage from 0.8V to 5.0V through external resistor divider as shown below.
V IN
IN A P 73 3 1 1uF E n a ble EN GND ADJ R2 OUT
Thermal Shutdown Protection
Thermal protection disables the output when the junction temperature rises to approximately +140C, allowing the device to cool down. When the junction temperature reduces to approximately +125C the output circuitry is enabled again. Depending on power dissipation, thermal resistance, and ambient temperature, the thermal protection circuit may cycle on and off. This cycling limits the heat dissipation of the regulator, protecting it from damage due to overheating.
V OUT
R1 1uF
Ultra Fast Start-up
The output voltage is calculated by:
R VOUT = VREF 1 + 1 R 2
Where VREF=0.4V (the internal reference voltage) Rearranging the equation will give the following that is used for adjusting the output to a particular voltage:
V R1 = R 2 OUT - 1 V REF
After enabled, the AP7331 is able to provide full power in as little as tens of microseconds, typically 80s, without sacrificing low ground current. This feature will help load circuitry move in and out of standby mode in real time, eventually extend battery life for mobile phones and other portable devices.
Fast Transient Response
Fast transient response LDOs can extend battery life. TDMA-based cell phone protocols such as Global System for Mobile Communications (GSM) have a transmit/receive duty factor of only 12.5 percent, enabling power savings by putting much of the baseband circuitry into standby mode in between transmit cycles. In baseband circuits, the load often transitions virtually instantaneously from 100A to 100mA. To meet this load requirement, the LDO must react very quickly without a large voltage drop or overshoot -- a requirement that cannot be met with conventional, general-purpose LDOs.
To maintain the stability of the internal reference voltage, R2 need to be kept smaller than 125k.
No Load Stability
Other than external resistor divider, no minimum load is required to keep the device stable. The device will remain stable and regulated in no load condition.
AP7331
Document number: DS31914 Rev. 3 - 2
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AP7331
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT LOW DROPOUT LINEAR REGULATOR Application Note (Continued)
Fast Transient Response (Continued)
The AP7331's fast transient response from 0 to 300mA provides stable voltage supply for fast DSP and GSM chipset with fast changing load.
Low Quiescent Current
The AP7331, consuming only around 65A for all input range and output loading, provides great power saving in portable and low power applications.
Small Overshoot and Undershoot
The AP7331 has small and controlled overshoot and undershoot in load and line transitions. This helps to protect supplied circuit from damage and operation error caused by glitches. This feature also permits the usage of small value output decoupling capacitor with AP7331.
Wide Output Range
The AP7331, with a wide output range of 0.8V to 5.0V, provides a versatile LDO solution for many portable applications.
Ordering Information
AP7331 - XX XX G - 7
Output Blank : ADJ 10 : 1.0V 12 : 1.2V 15 : 1.5V 18 : 1.8V 20 : 2.0V 25 : 2.5V 28 : 2.8V 30 : 3.0V 33 : 3.3V
Device
Package W : SOT25 SN : DFN2020-6
Green
Packing 7 : Tape & Reel
G : Green
Package Code
Packaging (Note 7)
AP7331-XXWG-7 AP7331-XXSNG-7
Note:
W SN
SOT25 DFN2020-6
7" Tape and Reel Quantity Part Number Suffix 3000/Tape & Reel -7 3000/Tape & Reel -7
7. 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.
Marking Information
1. SOT25 AP7331
Document number: DS31914 Rev. 3 - 2
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AP7331
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT LOW DROPOUT LINEAR REGULATOR
( Top View ) 5 4
7
XX Y W X 1
Device AP7331-ADJ AP7331-10 AP7331-12 AP7331-15 AP7331-18 AP7331-20 AP7331-25 AP7331-28 AP7331-30 AP7331-33
2
3
XX : Identification code Y : Year 0~9 W : Week : A~Z : 1~26 week; a~z : 27~52 week; z represents 52 and 53 week X : A~Z : Green
Package SOT25 SOT25 SOT25 SOT25 SOT25 SOT25 SOT25 SOT25 SOT25 SOT25 Identification Code QJ QK QL QM QN QT QP QQ QR QS
2. DFN2020-6
( Top View ) XX Y WX
XX : Identification Code Y : Year : 0~9 W : Week : A~Z : 1~26 week; a~z : 27~52 week; z represents 52 and 53 week X : A~Z : Green
Package DFN2020-6 DFN2020-6 DFN2020-6 DFN2020-6 DFN2020-6 DFN2020-6 DFN2020-6 DFN2020-6 DFN2020-6 DFN2020-6 Identification Code QJ QK QL QM QN QT QP QQ QR QS
Device AP7331-ADJ AP7331-10 AP7331-12 AP7331-15 AP7331-18 AP7331-20 AP7331-25 AP7331-28 AP7331-30 AP7331-33
Package Outline Dimensions (All Dimensions in mm)
1. Package Type: SOT25 AP7331
Document number: DS31914 Rev. 3 - 2
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AP7331
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT LOW DROPOUT LINEAR REGULATOR
2. Package Type: DFN2020-6
0.43mon.
0.57/0.63
Marking
0.05 C 0.15max.
(Active area depth) Seating plane C
0.08 C 0/0.05 2x 0.15 C
1.95/2.075 1.45/1.65
A
B
1.95/2.075
0.76/0.96
.1 R0
2x-
0.15 C 0.65nom. Bottom View 0.2/0.3 Pin#1 ID 0.05 M C A B
Tape Orientation (Note 8)
DFN2020-6 AP7331
Document number: DS31914 Rev. 3 - 2
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0.30/0.40
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AP7331
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT LOW DROPOUT LINEAR REGULATOR
Notes:
8. The taping orientation of the other package type can be found on our website at http://www.diodes.com/datasheets/ap02007.pdf
AP7331
Document number: DS31914 Rev. 3 - 2
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AP7331
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT LOW DROPOUT LINEAR REGULATOR
IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or trademark rights, nor the rights of others. Any Customer or user of this document or products described herein 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 Diodes Incorporated website, harmless against all damages. Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel. Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application. Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings noted herein may also be covered by one or more United States, international or foreign trademarks. LIFE SUPPORT Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein: A. Life support devices or systems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in significant injury to the user. B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness.
Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems. Copyright (c) 2011, Diodes Incorporated www.diodes.com
AP7331
Document number: DS31914 Rev. 3 - 2
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