The AP7362 is a 1.5A adjustable output voltage linear regulator with
ultra-low dropout. The device includes pass element, error amplifier,
band-gap, current limit and thermal shutdown circuitry. The integrated
Enable block allows the part to be turned on and off via a logic signal.
A logic high level on EN turns the device on and a logic low turns the
part off.
The low dropout voltage characteristics and fast transient response to
step changes in load make it suitable for low voltage microprocessor
applications. The typical quiescent current is approximately 0.5mA
and changes little with load current. The built-in current-limit and
thermal-shutdown functions prevent damage to the IC in fault
conditions.
This device is available in U-DFN2030-8 and SO-8EP packages.
Features
1.5A Ultra-Low Dropout Linear Regulator with EN
Ultra-Low Dropout: 190mV at 1.5A
Stable with 10µF Input/Output Capacitor, any type
Wide Input Voltage Range: 2.2V to 5.5V
Adjustable Output Voltage: 0.6V to 5.0V
Fixed Output Options: 1V, 1.2V, 1.5V, 1.8V, 2.5V, 3.3V
Low Ground Pin Current
25nA Quiescent Current in Shutdown Mode
V
V
Excellent Load/Line Transient Response
Current Limit and Thermal Shutdown Protection
Ambient Temperature Range: -40°C to +85°C
U-DFN2030-8, SO-8EP: Available in Lead free “Green” Molding
Halogen and Antimony Free. “Green” Device (Note 3)
P7362
1.5A, LOW QUIESCENT CURREENT, FAST TRANSIENT
ULTRA-LOW DROPOUT LINEAR REGULATOR
Pin Assignments
GND
EN
IN
IN
ADJ/
NC
U-DFN2030-8
1
2
3
4
(Top View)
6785
3214
IN INENGND
(Top View)
SO-8EP
OUTOUTOUT
8
ADJ/NC
OUT
7
OUT
6
OUT
5
Typical Application Circuit
V
IN
10µF
Enable
IN
EN
OUT
AP7362
GND
Fixed Output
V
OUT
10µF
V
IN
IN
OUT
V
OUT
EN
AP7362
GND
R1
10µF
ADJ
R2
Applications
ASIC Power Supplies in Printers, Graphics Cards, DVD Players,
STBs, Routers, etc
FPGA and DSP Core or I/O Power Supplies
10µF
Enable
SMPS Regulator
Conversion from 3.3V or 5V Rail
V
OUT
Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Output feedback pin for adjustable version only – a resistor divider from this pin to the OUT pin and
ground sets the output voltage.
The exposed pad (EP) is used to remove heat from the package and it is recommended that it is
connected to a copper area. The die is electrically connected to the exposed pad. It is recommended to
connect it externally to GND, but should not be the only ground connection.
Functional Block Diagram
P7362
IN
EN
Gate
Dri ver
Current Limit
and Thermal
Shutdown
0.605V
OUT
R
R
IN
EN
Gate
Dri ver
Current Limit
and Thermal
Shutdown
0.605V
GND
Fixed Version
Absolute Maximum Ratings (Note 4)(@T
Symbol Parameter Ratings Unit
ESD HBM Human Body Model ESD Protection 2000 V
ESD MM Machine Model ESD Protection 200 V
VIN Input Voltage -0.3 to +6.0 V
V
, VEN OUT, EN Voltage -0.3V to VIN +0.3 V
OUT
I
Continuous Load Current Internal Limited
OUT
TST Storage Temperature Range -65 to +150 °C
TJ Maximum Junction Temperature 150 °C
Note: 4. Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress
AP7362
Document number: DS35058 Rev. 6 - 2
Ratings only, and functional operation of the device at these or any other conditions beyond those indicated is not implied.
Exposure to absolute-maximum rated conditions for extended periods may affect device reliability.
Note: 5. Operating junction temperature must be evaluated and derated as needed, based on ambient temperature (TA), power dissipation (PD), maximum
allowable operating junction temperature (T
Input voltage 2.2 5.5 V
Output Current 0 1.5 A
Operating Ambient Temperature -40 +85
Operating Junction Temperature (Note 5) -40 +125
), and package thermal resistance (θJA).
J-MAX
C
C
Electrical Characteristics
(@TA = +25°C, V
= 3.3V, V
IN
OUT
=1.8V, I
= 10mA, VEN = VIN, C
OUT
= 10μF, C
IN
OUT
= 10μF, V
= 2V, unless otherwise stated.)
EN
Minimum and maximum limits are guaranteed through test, design, or statistical correlation. Typical values represent the most likely parametric
norm at T
= +25°C, and are provided for reference purposes only.
A
Symbol Parameter Test Conditions Min Typ Max Unit
T
V
= V
V
ADJ
V
ADJ
I
ADJ
V
DROPOUT
V
OUT
V
OUT
I
GND
I
SHDN
I
OUT-PK
ISC
VIH
VIL
I
IH
I
IL
t
d(OFF)
t
d(ON)
Notes: 6. Dropout voltage is the minimum voltage difference between the input and the output at which the output voltage drops 2% below its nominal value.
For any output voltage less than 2.5V, the minimum V
7. The line and load regulation specification contains only the typical number. However, the limits for line and load regulation are included in the adjust
voltage tolerance specification.
Minimum and maximum limits are guaranteed through test, design, or statistical correlation. Typical values represent the most likely parametric
norm at T
= +25°C, and are provided for reference purposes only.
A
Symbol
PSRR Ripple Rejection
n(l/f)
en
T
SHDN
T
HYS
θJA
θJC
Note: 8. Device mounted on 2” x 2” FR-4 substrate PCB, 2oz copper with minimum recommended pad layout.
A minimum 2.2μF ceramic capacitor is recommended between IN and GND pins to decouple input power supply glitch and noise. The amount of
the capacitance may be increased without limit. Larger input capacitor like 10μF will provide better load transient response. This input capacitor
must be located as close as possible to the device to assure input stability and reduce noise. For PCB layout, a wide copper trace is required for
both IN and GND pins. A lower ESR capacitor type allows the use of less capacitance, while higher ESR type requires more capacitance.
Output Capacitor
The output capacitor is required to stabilize and help the transient response of the LDO. The AP7362 is stable with any type of capacitor, with no
limitations on minimum or maximum ESR. The device is designed to have excellent transient response for most applications with a small amount
of output capacitance. 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 loads. This capacitor should be placed as close as possible to OUT and GND pins for
optimum performance.
Adjustable Operation
The AP7362 provides output voltage from 0.6V to 5.0V through external resistor divider as shown below.
V
IN
IN
OUT
V
OUT
10µF
Enable
AP7362
EN
GND
R1
10µF
ADJ
R2
Adjustable Output
The output voltage is calculated by:
V
OUT
Where V
Rearranging the equation will give the following that is used for adjusting the output to a particular voltage:
To maintain the stability of the internal reference voltage, R
= 0.6V (the internal reference voltage)
REF
need to be kept smaller than10k.
2
V
REF
V
OUT
R
R
2
1
V
REF
R
1
1
R
2
1
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
Any regulator which operates using a feedback loop must be compensated in such a way as to ensure adequate phase margin, which is defined
as the difference between the phase shift and -180 degrees at the frequency where the loop gain crosses unity (0 dB). For most LDO regulators,
the ESR of the output capacitor is required to create a zero to add enough phase lead to ensure stable operation. The AP7362 has an internal
compensation circuit which maintains phase margin regardless of the ESR of the output capacitor, any type of capacitor can be used.
Below two charts show the gain/phase plot of the AP7362 with an output of 1.2V, 10μF ceramic output capacitor, delivering 1.5A load current
and no load. It can be seen the phase margin is about 90° (which is very stable).
Below two charts show the gain/phase plot of the AP7362 with an output of 1.2V, 10 μF ceramic output capacitor, delivering 1.5A load current
and no load. It can be seen the phase margin is about 90° (which is very stable).
120
PHASE
100
80
60
GAIN
40
20
AIN (dB)
0
-20
L
-40
V = 2.7V
IN
-60
V = 1.2V
OUT
I = 1.5A
-80
L
C = 10µF CER
100
OUT
1k10k100k1M
-100
-120
FREQUENCY(Hz)
Gain-Bandwidth Plot for 1.5A Load
120
100
PHASE
80
60
40
(dB)
AI
GAIN
20
0
-20
L
-40
V = 2.7V
IN
-60
V = 1.2V
OUT
I = 0A
-80
L
C = 10µF CER
-100
OUT
-120
1001k10k100k1M
FREQUENCY(Hz)
Gain-Bandwidth Plot for no Load
ON/OFF Input Operation
The AP7362 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 V
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
prevent over-current and to protect the regulator from damage due to overheating.
Thermal Shutdown Protection
Thermal protection disables the output when the junction temperature rises to approximately +170°C, allowing the device to cool down. When
the junction temperature reduces to approximately +160°C 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.
Low Quiescent Current
The AP7362, consumes only around 0.5mA for all input voltage range and load currents, this provides great power saving in portable and low
power applications.
Output Noise
This is the integrated value of the output noise over a specified frequency range. Input voltage and output load current are kept constant during
the measurement. Results are expressed in μVrms or μV √Hz.
The AP7362 is a low noise regulator and needs no external noise reduction capacitor. Output voltage noise is typically 100μVrms overall noise
level between 100 Hz and 100 kHz
Noise is specified in two ways:
Output noise density is the RMS sum of all noise sources, measured at the regulator output, at a specific frequency (measured with a 1Hz
bandwidth). This type of noise is usually plotted on a curve as a function of frequency.
Output noise voltage is the RMS sum of spot noise over a specified bandwidth. Spot noise is measured in units μV/√Hz or nV/√Hz and total
output noise is measured in μV(RMS). The primary source of noise in low-dropout regulators is the internal reference.
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
ensure reliable operation. Power dissipation of the device depends on input voltage and load conditions and can be calculated by:
= (V
- V
P
D
The maximum power dissipation, handled by the device, depends on the junction to ambient thermal resistance, and maximum ambient
temperature, which can be calculated by the equation in the following:
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