Download datasheet for APE8841 by Advanced Power Electronics Corp.

Download datasheet for APE8841 by Advanced Power Electronics Corp.
Advanced Power
Electronics Corp.
APE8841
Preliminary
DUAL 700mA LDO REGULATOR WITH ENABLE FUNCTION
FEATURES
DESCRIPTION
Input Voltage Range :
Channel 1 : 3.4V to 5.5V
Channel 2 : 2.8V to 5.5V
Low Quiescent Current is 100uA (typ.)
Tight Load and Line Regulation
Fast Transient Response
Current Limit and Thermal Shutdown Protection
Only low-ESR Ceramic Capacitors Required for Stability
Available in the TO-252-5L Pb-Free Package
The APE8841 is an efficient, precise dual-channel
CMOS LDO regulator optimized for ultra-low-quiescent
applications. Regulators output1 and output2 are capable of
sourcing 700mA of output current. The regulators are stable
with output capacitors as low as 1µF, including current limit,
thermal shutdown protection, fast transient response, low
dropout voltage, high output accuracy, current limiting
protection, and high ripple rejection ratio. The APE8841
contain internal pull high enable function that allows the
output of regulator to be turned off. The APE8841 regulators
are available in used TO-252-5L Pb-Free package.
TYPICAL APPLICATION
VIN
2
1
VOUT1
C2
1uF
5
4
VOUT2
C4
1uF
C1
1uF
ON
OFF
3
PACKAGE ORDERING INFORMATION
( Side View )
( Top View )
Package
Output voltage
H : TO-252-5L
A : VOUT1=3.3V, VOUT2=1.8V
B : VOUT1=3.3V, VOUT2=1.5V
C : VOUT1=3.3V, VOUT2=1.2V
5 EN
4 OUT2
3 GND
2 VIN
1 OUT1
Metal
Tab
GND
TO-252-5L
Data and specifications subject to change without notice
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20090625pre
Advanced Power
Electronics Corp.
APE8841
ABSOLUTE MAXIMUM RATINGS
VIN1, VIN2 Pin Voltage (VIN1,2) ………………………… 6V
Output Voltage (VOUT1/VOUT2) ………………………
GND - 0.3 to VIN + 0.3V
Enable Voltage (VEN) ………………………………… GND - 0.3 to VIN + 0.3V
Power Dissipation (PD) ……………………………… Internally Limited
Storage Temperature Range (TST) ………………… -65°C To 150°C
Operating Junction Temperature Range (T OPJ) …… -40°C To + 125°C
Junction Temperature (TJ) …………………………… -40°C To + 150°C
Thermal Resistance from Junction to case (R thjc)
10°C/W
Thermal Resistance from Junction to ambient (R thja)Note
30°C/W
Note: Rthja is measured with the PCB copper area of approximately 1 in2(Multi-layer). That need connect to tap pin.
ELECTRICAL SPECIFICATIONS( VIN1 = VIN2 = 5V, TA=25oC (unless otherwise noted))
Parameter
Input Voltage (Note1)
Enable Input Threshold
Shutdown Current
SYM
TEST CONDITION
MIN
TYP
MAX
UNITS
VIN
IOUT1=30mA
3.4
-
5.5
VIN
IOUT2=30mA
2.8
-
5.5
VENH
2.0
-
-
VENL
-
-
0.8
-
4
8
uA
ISD
IOUT1,2 =0mA, VIN=5V, VEN=0V
V
V
Temperature Shutdown
TSD1,2
-
150
-
°C
Temperature Shutdown Hysterisis
TSDR1,2
-
40
-
°C
Regulator1
Output Voltage Accuracy
VOUT1
Output Voltage Temperature stability
IOUT=30mA
3.234
3.3
3.366
V
IOUT1=10mA (Note4)
-
1
-
%
mV
IOUT1=700mA, VOUT1=VOUT1-2%
-
300
500
IOUT1 =0mA, VIN1=5V
VIN1 = 4.3V to 5.5V, IOUT1 = 30mA
-
50
80
uA
Line Regulation
IQ1
VLine1
-
0.1
0.2
%/V
Load Regulation
VLOAD
IOUT1 =1m~700mA
-
10
40
mV
Current Limit
ILIMIT1
VIN1 = 5.0V
800
-
-
mA
Short Circuit Current
IShort1
VOUT1<0.25 x VOUT1
-
500
-
mA
IOUT1 =30mA, F=100Hz
-
-60
-
dB
IOUT2=30mA (APE8841H-A)
1.764
1.8
1.836
IOUT2=30mA (APE8841H-B)
1.47
1.5
1.53
IOUT2=30mA (APE8841H-C)
1.176
1.2
1.224
Dropout Voltage
Quiescent Current
Ripple Rejection
VDROP1
PSRR1
Regulator2
Output Voltage Accuracy
VOUT2
IOUT2=10mA
Output Voltage Temperature stability
Dropout Voltage
Quiescent Current
Line Regulation
VDROP2
IQ2
VLine2
IOUT2=700mA,
VOUT2=VOUT2-2%
Load Regulation (Note3)
VLOAD
IOUT2 =1m~700mA
ILIMIT2
VIN2 = 5.0V
Short Circuit Current
IShort2
Ripple Rejection
PSRR2
-
1
-
VOUT=1.2V
-
1400
1600
VOUT=1.5V
-
1100
1300
VOUT=1.8V
-
800
1200
-
50
80
uA
-
0.1
0.2
%/V
mV
IOUT2 =0mA, VIN2=5V
VIN2 = 2.8V to 5.5V, IOUT2 = 30mA
Current Limit (Note2)
V
%
mV
-
10
30
800
-
-
mA
VOUT2<0.25 x VOUT2
-
500
-
mA
IOUT2 =30mA, F=100Hz
-
-60
-
dB
Note1: The device is not guaranteed to function outside its operating conditions.
Note2: Current limit is measured at constant junction temperature by using pulsed testing with a low ON time.
Note3: Regulation is measured at constant junction temperature by using pulsed testing with a low ON time.
Note4: Guaranteed by design.
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Advanced Power
Electronics Corp.
APE8841
PIN DESCRIPTIONS
PIN SYMBOL
GND
PIN DESCRIPTION
Common Ground
VOUT1
Channel1 Output Voltage
VOUT2
Channel2 Output Voltage
VIN
Channel1/2 input Voltage
EN
Channel1/2 Shutdown Control Pin, the pin is internal pull high
BLOCK DIAGRAM
VIN
Bandgap
+
VOUT2
Thermal
Shutdown
Error
Amp
Current
Limit1
- +
-
Current
Limit2
Error
Amp
VOUT1
Enable
GND
EN
FUNCTION DESCRIPTIONS
The APE8841 is a highly accurate, dual, low noise, CMOS LDO voltage
regulators with enable function. The output voltage for each regulator is set
independently by fuse trimming. As illustrated in function block diagram, it consists of a
reference, error amplifier, a P-channel pass transistor, an ON/OFF control logic and an
internal feedback voltage divider. The band gap reference is connected to the error
amplifier, which compares the reference with the feedback voltage and amplifies the
voltage difference. If the feedback voltage is lower than the reference voltage, the
pass- transistor gate is pulled lower, which allows more current to pass to the VOUT
pin and increases the output voltage. If the feedback voltage is too high, the pass
transistor gate is pulled up to decrease the output voltage. The output voltage is feed
back through an internal resistive divider connected to VOUT pin. Additional blocks
include an output current limiter, thermal sensor, and shutdown logic.
Enable Function
EN pin start and stop the corresponding two outputs. This pin is internal pull high.
When the EN pin is switched to the power off level, the operation of all internal circuit
stops, the build-in P-channel MOSFET output transistor between pins VIN and VOUT
is switched off, allowing current consumption to be drastically reduced.
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Advanced Power
Electronics Corp.
APE8841
Dropout Voltage
A regulator’s minimum input-output voltage differential, or dropout voltage,
determines the lowest usable supply voltage. The APE8841 use a P- channel
MOSFET pass transistor, its dropout voltage is function of drain-to-source onresistance RDS (ON) multiplied by the load current.
VDROPOUT = VIN-VOUT = RDS(ON) x IOUT
Current Limit
Each channel of APE8841 includes a fold back current limiter. It monitors and
controls the pass transistor’s gate voltage, estimates the output current, and limits the
output current minimum 800mA.
Thermal Shutdown Protection
Thermal Shutdown protection limits total power dissipation of APE8841. When
the junction temperature exceeds TJ = +150°C, a thermal sensor turns off the pass
transistor, allowing the IC to cool down. The thermal sensor turns the pass transistor
on again after the junction temperature cools down by 40°C, resulting in a pulsed
output during continuous thermal shutdown conditions.
Thermal shutdown protection is designed to protect the APE8841 in the event of fault
conditions. For continuous operation, the absolute maximum operating junction
temperature rating of TJ = +125°C should not be exceeded.
Application Information
Like any low-dropout regulator, the APE8841 requires input and output decoupling
capacitors. The device is specifically designed for portable applications requiring
minimum board space and smallest components. These capacitors must be correctly
selected for good performance (see Capacitor Characteristics Section). Please note
that linear regulators with a low dropout voltage have high internal loop gains which
require care in guarding against oscillation caused by insufficient decoupling
capacitance.
Input Capacitor
An input capacitance of 1µF is required between input pin and ground directly
(the amount of the capacitance may be increased without limit). The input capacitor
must be located less than 1cm from the device to assure input stability. A lower ESR
capacitor allows the use of less capacitance, while higher ESR type (like aluminum
electrolytic) requires more capacitance. Capacitor types (aluminum, ceramic and
tantalum) can be mixed in parallel, but the total equivalent input capacitance/ ESR
must be defined as above to stable operation. There are no requirements for the ESR
on the input capacitor, but tolerance and temperature coefficient must be considered
when selecting the capacitor to ensure the capacitance will be 1µF over the entire
operating temperature range.
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Advanced Power
Electronics Corp.
APE8841
Input Capacitor
The APE8841 is designed specifically to work with very small ceramic output
capacitors. A ceramic capacitor (temperature characteristics X7R, X5R) in 1µF is
suitable for the APE8841 application. The recommended minimum capacitance for the
device is 1µF, X5R or X7R dielectric ceramic, between VOUT and GND for stability,
but it may be increased without limit. Higher capacitance values help to improve
transient. The output capacitor's ESR is critical because it forms a zero to provide
phase lead which is required for loop stability.
Thermal Considerations
The APE8841 series can deliver a current of up to 600mA/channel over the full
operating junction temperature range. However, the maximum output current must be
debated at higher ambient temperature to ensure the junction temperature does not
exceed 125°C. With all possible conditions, the junction temperature must be within
the range specified under operating conditions. Power dissipation can be calculated
based on the output current and the voltage drop across regulator.
PD = (VIN - VOUT) IOUT + VIN IGND
The final operating junction temperature for any set of conditions can be estimated
by the following thermal equation:
PD (MAX) = (TJ (MAX) - TA) / JA
Where TJ (MAX) is the maximum junction temperature of the die (125° C) and TA is the
maximum ambient temperature. The junction to ambient thermal resistance ( JA) TO252-5L package at recommended minimum footprint is 30°C/W that is connect 1 in2
PCB copper area to exposed pad.
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Advanced Power
Electronics Corp.
APE8841
TYPICAL PERFORMANCE CHARACTERISTICS
6
Advanced Power
Electronics Corp.
APE8841
TYPICAL PERFORMANCE CHARACTERISTICS
7
Advanced Power
Electronics Corp.
APE8841
TYPICAL PERFORMANCE CHARACTERISTICS
Power ON Test (Channel1)
Power ON Test (Channel2)
Load Transient (Channel 1)
Load Transient (Channel 2)
8
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