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AP7168
1.2A LOW DROPOUT REGULATOR WITH POK
Features
* * * * * * * * * * * * * * Wide input voltage range: 2.2V - 5.5V 230mV very low dropout at 500mA load 500mV very low dropout at 1A load Very low quiescent current (IQ): 125A typical Adjustable output voltage range: 0.8V to 5.0V Very fast transient response High PSRR Accurate voltage regulation Current limiting and short circuit protection Thermal shutdown protection Stable with any type output capacitor 4.7F Ambient temperature range -40C to 85C SOP-8L-EP: Available in "Green" Molding Compound (No Br, Sb) Lead Free Finish/ RoHS Compliant (Note 1)
Description
The AP7168 is a 1.2A, adjustable output voltage, ultra-low dropout linear regulator. The device includes pass element, error amplifier, band-gap reference, current limit and thermal shutdown circuitry. The device is turned on when EN pin is set to logic high level. A Power-OK (POK) output is available for power sequence control. The characteristics of the low dropout voltage and low quiescent current make it suitable for low to medium power applications, for example, laptop computers, audio and video applications, and battery powered devices. The typical quiescent current is approximately 125A. Built-in current-limit and thermal-shutdown functions prevent IC from damage in fault conditions. The AP7168 is available in SOP-8L-EP package.
Applications
* * * * * * Servers and laptops Smart phone and PDA MP3/MP4 Bluetooth headset Low and medium power applications FPGA and DSP core or I/O power
Typical Application Circuit
VIN
IN 100kOhm 1F POK AP7168 FB R2 Enable EN GND R1 10F OUT
VOUT
R VOUT = VREF 1 + 1 R 2
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AP7168
1.2A LOW DROPOUT REGULATOR WITH POK
Ordering Information
AP7168 - SP G - 13
Package SP : SOP-8L-EP
Device AP7168-SPG-13
Notes:
Green G : Green
Packing 13 : Tape & Reel
Package Code SP
Packaging (Note 2) SOP-8L-EP
13" Tape and Reel Quantity Part Number Suffix 2500/Tape & Reel -13
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. 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.
Pin Assignments
(1) SOP-8L-EP
( Top View )
IN POK NC EN 1 2 3 4 8 7 6 5 OUT FB NC GND
Pin Descriptions
Name IN POK EN GND FB OUT NC Pin Number 1 2 4 5 7 8 3, 6 Description Voltage input pins, to be tied together externally. Bypass to ground through at least 1F capacitor. Power-OK output, active-high open-drain. Enable input, active high. Ground. Output feedback. Voltage output pins, to be tied together externally. Bypass to ground through at least 4.7F ceramic capacitor. No connection.
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AP7168
1.2A LOW DROPOUT REGULATOR WITH POK
Functional Block Diagram
IN
Current Limit and Thermal Shutdown
OUT
EN
Gate Driver
FB POK
0.8V
0.744V
GND
Absolute Maximum Ratings
Symbol ESD HBM ESD MM VIN Parameter Human Body Model ESD Protection Machine Model ESD Protection Input Voltage OUT, FB, POK, EN Voltage Continuous Load Current TJ TST PD
Notes:
Ratings 4 300 7 VIN + 0.3 Internal Limited -40 ~ 150 -65 ~150
Unit KV V V V C C W
Operating Junction Temperature Range Storage Temperature Range Power Dissipation SOP-8L-EP (Note 3, 5)
1.9
3. Ratings apply to ambient temperature at 25C
Recommended Operating Conditions
Symbol VIN IOUT TA Parameter Input voltage Output Current Operating Ambient Temperature Min 2.2 0 -40 Max 5.5 1.2 85 Unit V A C
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AP7168
1.2A LOW DROPOUT REGULATOR WITH POK
Electrical Characteristics
(TA = 25 C, VIN = VOUT +1V, CIN = 1F, COUT = 10F, VEN = VIN, unless otherwise stated)
o
Symbol IQ ISHDN VDropout VREF IFB VOUT
Parameter Input Quiescent Current Input Shutdown Current Dropout Voltage FB reference voltage FB leakage Output Voltage Total Accuracy
Test Conditions IOUT= 0 VEN = 0V, IOUT = 0 (Note 4) VOUT 1.5V, IOUT = 0.5A VOUT 1.5V, IOUT = 1A
Min -1
-3 VIN = VOUT +1V to 5.5V, IOUT = 1mA IOUT from 1mA to 1A VEN = 0V to 2.0V, IOUT = 100mA, VIN = 3.3V 1kHz, VIN = 3.3V, VOUT = 1.2V, IOUT = 100mA VOUT = 1.8V, ROUT = 0.5 VIN = 3.3V, VOUT < 0.2V -1.5
Typ. 125 0.1 230 500 0.8 0.01
Max 180 1 800 1 3
Unit A A mV mV V A % %/V
VOUT / VOUT Line Regulation VIN
VOUT / VOUT tST PSRR ILIMIT ISHORT VIL VIH IEN VOL VPOK_TH_UP Load Regulation Start-up Time, from EN high to POK high Power Supply Rejection Ratio Current limit Short-circuit Current EN Input Logic Low Voltage EN Input Logic High Voltage EN Input leakage POK output low voltage Output voltage (rising) POK threshold Output voltage POK hysteresis
0.02 1.5 190 60 1.2 1.6 750 0.4
% s dB A mA V V A mV Vref Vref s A C C
o
VEN = 0V or 5.5V Force 2mA FB (or OUT for fixed version) rising VIN = 3.3V, VOUT = 1.2V VPOK = 5.5V
1.4 87%
0.01 100 92% 4% 160 0.01 145 25 74
1 200 97%
VPOK_Hys POK deglitch POK leakage current IPOK_LK Thermal shutdown threshold TSHDN Thermal shutdown hysteresis THYS Thermal Resistance JA Junction-to-Ambient
Notes:
1
SOP-8L-EP (Note 5)
C/W
4. POK pin must be disconnected from IN pin. 5. Test condition for SOP-8L-EP: Device mounted on 2oz copper, minimum recommended pad layout on top & bottom layer with thermal vias, double sided FR-4 PCB.
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AP7168
1.2A LOW DROPOUT REGULATOR WITH POK
Typical Performance Characteristics
Output Voltage vs. Temperature
3.40
Output Voltage vs. Tem perature
1.30
VOUT = 3.3V
VOUT = 1.2V
3.35
Output Voltage (V)
Output Voltage (V)
1.25
3.30
1.20
3.25
1.15
3.20 -50 -25 0 25 50 75 100 125
1.10 -50 -25 0 25 50 75 100 125
Temperature ( C)
0
Tem perature (0C)
Quiescent Current vs. Input Voltage
170
Quiescent Current vs. IOUT Quiescent Current ( A)
170 160 150 140 130 120 110 100 VIN=2.5V VIN=3.3V 0.0 0.2 0.4 0.6 0.8 1.0 1.2
VOUT=3.3V
VOUT=1.8V
Quiescent Current (A)
155
140
125
110
95
Iout=0mA Iout=500mA
80 4.0 4.3 4.6 4.9 5.2 5.5
Input Voltage (V)
IOUT (A)
Quiescent Current vs. Tem perature
170
0.810
Reference Voltage vs. Temperature
Quiescent Current ( A)
155
Reference Voltage (V)
0.805
140
125
0.800
110 VIN=2.2V, Vout=1.0V 95 VIN=3.3V, Vout=1.8V VIN=5.0V, Vout=3.3V 80 -50.0 -25.0 0.0 25.0 50.0 75.0 100.0 125.0
0.795
Vin=2.2V Vin=3.3V Vin=5.5V
0.790 -50 -25 0 25 50 75 100 125
Tem perature ( C)
0
Temperature (0C)
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Typical Performance Characteristics
(Continued)
Line Regulation
VOUT=1.8V, IOUT=1mA
0.10 0.5 25C
Load Regulation
VIN=2.2V, VOUT=1.2V,
Change in V OUT (%/V)
Change in V OUT (%)
0.4 0.3 0.2 0.1 0.0 -0.1 -0.2 -0.3 -0.4 -0.5
85C -40C
0.05
0.00
-0.05
25C 85C -40C
-0.10 3.0 3.5 4.0 4.5 5.0 5.5
0.0
0.4
0.8
1.2
V IN (V)
IOUT (A)
Short Circuit Current vs. Input Voltage
0.77
Short Circuit Current vs. Temperature
0.80
VOUT=1.2V
VOUT=1.2V
Short Circuit Current (A)
0.76 0.75 0.74 0.73 0.72 0.71 0.70 0.69 2.2 2.4 2.6 2.8 3 3.2 3.4
Short Circuit Current (A)
0.75
0.70
0.65
0.60 -50 -25 0 25 50 75
Input Voltage (V)
Temperature ( C)
o
Dropout Voltage vs. IOUT
VOUT=3.3V
700
PSRR -40 -45 -50 PS RR (dB)
25C 85C -40C
Dropout Voltage (mV)
600
500
-55 -60 -65 -70 -75 -80 100
400
300
200
100
0 0 0.2 0.4 0.6 0.8 1 1.2
IOUT(A)
1000 10000 Frequency (Hz)
100000
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AP7168
1.2A LOW DROPOUT REGULATOR WITH POK
Typical Performance Characteristics
Line Transient Response
VIN =3V to 5.5V COUT =10uF (Ceramic)
(Continued) Line Transient Response
VIN =5.5V to 3V COUT =10uF (Ceramic)
VIN 2V/div
VIN 2V/div
VOUT 50mV/div
VOUT 50mV/div
Time (5ms/div) Output Load Transient Response (VOUT=1.8V)
COUT=470uF (electrolytic)
Time (500us/div) Output Load Transient Response (VOUT=3.3V)
COUT=470uF (electrolytic)
VOUT 100mV/div
COUT=10uF (Ceramic)
VOUT 100mV/div
COUT=10uF (Ceramic)
COUT=1uF (Ceramic)
COUT=1uF (Ceramic)
1.2A IOU 500mA/div 50mA 1A/us IOU 500mA/div 50mA
1.2A 1A/us
Time (100us/div) Start-up Time (VOUT=1.2V, IOUT=0.1A)
Time (100us/div) Start-up Time (VOUT=1.2V, IOUT=1.2A)
VEN 2V/div
VEN 2V/div
COUT=10uF VOUT 1V/div VOUT 1V/div
COUT=10uF
VPOK 2V/div
VPOK 2V/div
Time (50us/div)
Time (50us/div)
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AP7168
1.2A LOW DROPOUT REGULATOR WITH POK
Typical Performance Characteristics
(Continued)
Current Limit vs. Temperature
1.8
Current Limit (A)
1.7
1.6
1.5 VIN =2.8V,Vout=1.8V VIN =3.3V,Vout=1.8V 1.4 -50 -25 0 25 50 75 100
Temperature (oC)
Application Note
Input Capacitor A 1F ceramic capacitor is recommended to connect between IN and GND pins to decouple input power supply glitch and noise. The amount of the capacitance may be increased without limit. A lower ESR (Equivalent Series Resistance) capacitor allows the use of less capacitance, while higher ESR type requires more capacitance. This input capacitor should 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 IN and GND. Output Capacitor The output capacitor is required to stabilize and help the transient response of the LDO. The AP7168 is designed to have excellent transient response for most applications with a small amount of output capacitance. The AP7168 is stable for all available types and values of output capacitors 4.7F. The device is also stable with multiple capacitors in parallel, which can be of any type of value. Additional capacitance helps to reduce undershoot and overshoot during transient. This capacitor should be placed as close as possible to OUT and GND pins for optimum performance. Adjustable Operation The AP7168 provides output voltage from 0.8V to 5.0V through external resistor divider as shown below.
VIN
IN OUT
VOUT
CIN
100kOhm
AP7168 POK FB
R1
COUT
R2 Enable EN GND
The output voltage is calculated by:
R VOUT = VREF 1 + 1 R2
Where VREF=0.8V (the internal reference voltage) Rearranging the equation will give the following equation to find the approximate resistor divider values:
V R1 = R 2 OUT - 1 V REF
To maintain the stability of the internal reference voltage, R2 needs to be kept smaller than 250k.
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Application Note
(Continued)
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. ENABLE/SHUTDOWN Operation The AP7168 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. POWER-OK The Power-Ok (POK) pin is an active high open-drain output. It can be connected to any 5.5V or lower rail through an external pull-up resistor. The recommended sink current of POK pin is up to 4mA, so the pull-up resistor for POK should be in the range of 10k to 1M. If output voltage monitoring is not needed, the POK pin can be left floating. 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 1.6A (1.2A min) to prevent over-current and to protect the regulator from damage due to overheating. Short Circuit Protection When OUT pin is short-circuited to GND or OUT voltage is less than 200mV, short circuit protection be triggered and clamp the output current approximately 750mA. This feature protects regulator from over-current and damage due overheating.
Wide Output Range The AP7168, with a wide output range of 0.8V to 5.0V, provides a versatile solution for many portable and low power applications. Thermal Shutdown Protection Thermal protection disables the output when the junction temperature rises to approximately +145C, allowing the device to cool down. When the junction temperature reduces to approximately +120C 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. Power Dissipation The device power dissipation and proper sizing of the thermal plane that is connected to the thermal pad is critical to avoid thermal shutdown and ensuring reliable operation. Power dissipation of the device depends on input voltage and load conditions and can be calculated by:
PD = ( VIN - VOUT )xIOUT
The AP7168 is available in the SOP-8L-EP packages, both with exposed pad, which is the primary conduction path for heat to the printed circuit board (PCB). The pad can be connected to ground or be left floating; however, to ensure the device will not overheat, it should be attached to an appropriate amount of copper PCB area. However, the maximum power dissipation that can be handled by the device depends on the maximum junction to ambient thermal resistance, maximum ambient temperature, and maximum device junction temperature, which can be approximated by the equation below:
pin will to the to
Low Quiescent Current The AP7168, consuming only around 150A for all input range and output loading, provides great power saving in portable and low power applications.
PD (max@ TA ) =
( +150C - TA ) R JA
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1.2A LOW DROPOUT REGULATOR WITH POK
Marking Information
(1) SOP-8L-EP
( Top View )
8 5
Logo Part No. AP7168 YY WW X X E
1 4
G : Green YY : Year : 08, 09,10~ WW : Week : 01~52; 52 represents 52 and 53 week X : Internal Code SOP-8L-EP
Package Information
(1) Package Type: SOP-8L-EP
(All Dimensions in mm)
Detail "A" Exposed pad
7~9
3.85/3.95
5.90/6.10
3.70/4.10
45 0.35max.
7~9 1 1.30/1.50 1.75max.
0.15/0.25 3.3Ref.
1
Bottom View
0/0.13
0.254
1.27typ 4.85/4.95 1
0.3/0.5
Gauge Plane Seating Plane
0.62/0.82
Detail "A"
8x-0.60
Exposed pad
6x-1.27 8x-1.55
Land Pattem Recommendation (Unit:mm)
Notes:
6. All dimensions are in millimeters. Angles are in degrees. 7. Coplanarity applies to the exposed heat sink slug as well as the terminals.
5.4
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1.2A LOW DROPOUT REGULATOR WITH POK
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