Advanced Power Electronics Corp. APE8837 DUAL CHANNEL LDO

Advanced Power
Electronics Corp.
APE8837
DUAL CHANNEL LDO REGULATORS WITH ENABLE
FEATURES
DESCRIPTION
▓
Input Voltage Range : 2.5V to 6V
The APE8837 is a high accurately, low noise, high
▓
Varied Fixed Output Voltage Combinations
ripple rejection ratio, low dropout, dual CMOS LDO
▓
200mV Dropout at 200mA Output Current (Vout
voltage regulators with enable function. The EN
≧2.5V)
function allows the output of each regulator to be
▓
Output Current: 200mA/channel (typ.)
turned off independently, resulting in greatly reduced
▓
Low Quiescent Current : 60uA (typ.)
power consumption.
▓
Current Limit and Short Current Protection
The APE8837 has the soft start function to suppress
▓
Thermal Shutdown Protection
the inrush current. The current limit is over 250mA
▓
Fast Transient Response
per channel and also operates as a short protection
▓
Low ESR Capacitor Compatible (X7R, X5R)
for the output current limiter. The output voltage for
▓
Halogen Free Product
each regulator is set independently by metal
trimming.
The APE8837 is fully compatible with low ESR
ceramic capacitors, reducing cost and improving
output stability. This high level output stability is
maintained even during frequent load fluctuations,
due to the excellent transient response performance
and high PSRR achieved across a broad range of
frequency. It is available in the SOT-26, TSOT-26
and DFN 2x2 packages.
TYPICAL APPLICATION
VIN
CIN
2.2uF
VOUT2
EN 2
VIN
EN 1
VOUT1
VOUT 2
VOUT 1
GND
COUT2
2.2uF
Data and specifications subject to change without notice
APE8837
COUT1
2.2uF
1
20130916V7.3
Advanced Power
Electronics Corp.
APE8837
ORDERING / PACKAGE INFORMATION
APE8837 XX
Top View
SOT-26 / TSOT-26
Output Type Code
VOUT1 GND VOUT2
Package Type
Y: SOT-26
TY: TSOT-26
GN2: DFN 2x2-6L
6
5
4
(Marking)
1
EN1
J : 2.8+3.3V
S: 1.2V+1.8V
B : 1.8V+2.8V
K : 3.0+3.0V
T : 1.5V+3.3V
C : 1.8V+2.6V
L : 3.0V+3.3V
U : 2.5V+2.5V
D : 1.8V+3.3V
M : 3.3V+3.3V
V : 1.5V+3.0V
E : 2.5V+2.8V
N : 1.2V+3.3V
W : 1.2V+2.8V
F : 2.8V+1.2V
P : 1.8V+3.0V
X : 1.2V+1.2V
G : 2.8V+1.8V
Q : 1.5V+2.5V
Y : 2.8V+1.5V
H : 2.8+3.0V
R : 3.3V+1.8V
Z : 2.8V+2.8V
3
EN2
Top View
DFN 2x2-6L
Output Type Code : (V OUT1+V OUT2)
A : 1.5V+2.8V
2
VIN
EN1
VIN
1
2
EN2 3
6
VOUT1
Exposed
Pad
5
GND
GND
4
VOUT2
ABSOLUTE MAXIMUM RATINGS (at TA=25°C)
VIN
-0.3V to 6.5V
VOUT1, VOUT2
-0.3V to 6.5V
EN1, EN2
-0.3V to 6.5V
Output Current (IO1+IO2)
800mA
Junction Temperature (TJ)
-40 to 125°C
Operating Temperature Range (TOP)
-40°C to 85°C
Storage Temperature Range (TST)
-65 to +150°C
Lead Temperature (Soldering, 10sec.)
260°C
Thermal Resistance from Junction to Ambient (RθJA)
SOT-26 / TSOT-26
250°C/W
DFN 2x2-6L
120°C/W
Thermal Resistance from Junction to Case (RθJC)
SOT-26 / TSOT-26
180C/W
DFN 2x2-6L
25°C/W
2
Note: RθJA is measured with the PCB copper area of approximately 1 in (Multi-layer) which connect to GND pin or exposed pad (DFN
2x2-6L).
2
Advanced Power
Electronics Corp.
APE8837
ELECTRICAL SPECIFICATIONS
(VIN=5V, TA =25°C, unless otherwise specified)
PARAMETER
Input Voltage
SYM
VIN
Output Voltage Accuracy
Quiescent Current
Dropout Voltage
ΔVOUT
ICC
VDROP
Current Limit (Note1)
Short Circuit Current
ILIMIT
ISC
TEST CONDITION
MIN
TYP
MAX
UNIT
IOUT=10mA
2.5
6
V
IOUT =1mA, VIN=5V, VOUT >1.8V
-2
2
%
IOUT =1mA, VIN=5V,VOUT ≦1.8V
-0.04
0.04
V
60
100
uA
IOUT=0.2A, VO=VO-2%, VOUT=1.2V
1100
1500
mV
IOUT=0.2A, VO=VO-2%, VOUT=1.5V
800
1200
mV
IOUT=0.2A, VO=VO-2%, VOUT=1.8V
500
900
mV
IOUT=0.2A, VO=VO-2%, VOUT>2.5V
200
400
mV
IOUT1,2=0mA, VIN=5V
VIN=VOUT +1.0V, VEN=VIN
250
Output Voltage < 0.25xVOUT,
mA
150
each channel
mA
ΔVLINE
IOUT =1mA, VIN=VOUT+1V to 6.0V
0.2
0.3
%/V
(Note 1)
ΔVLOAD
IOUT =1~100mA, VIN=VOUT+1V
0.01
0.03
%/mA
Ripple Rejection (Note2)
PSRR
f=120Hz, IOUT= 30mA
Line Regulation
Load Regulation
Output Voltage Temperature
Coefficient (Note2)
T.C.
VENH
Enable Input Threshold
VENL
Enable Pull-high Current
IEN1,2
Shutdown Current
ISD
Thermal Shutdown Threshold
TSD
(Note2)
60
IOUT=1mA
dB
ppm/
+100
ºC
VIN=5V
1.7
V
VIN=3.3V
1.4
V
VIN=5V
1.2
V
VIN=3.3V
1.0
V
VEN1,2 = 0V
-
1
2
uA
IOUT1,2 =0mA, VIN=5V, VEN1,2=0V
-
2
4
uA
Hysteresis
150
o
40
o
C
C
Note1: It is measured at constant junction temperature by using pulsed testing with a low ON time.
Note2: Guarantee by design, not production tested.
3
Advanced Power
Electronics Corp.
APE8837
PIN DESCRIPTIONS
PIN No.
PIN SYMBOL
PIN DESCRIPTION
1
EN1
VOUT1 Enable Control Pin. Internal pull high.
2
VIN
Input Voltage.
3
EN2
VOUT2 Enable Control Pin. Internal pull high.
4
VOUT2
5
GND
6
VOUT1
Output2 Voltage.
Common Ground Pin.
Output1 Voltage.
BLOCK DIAGRAM
VIN
VOUT2
Bandgap
+
Error
Amp
Thermal
Shutdown
Enable 2
Current
Limit 1
- +
-
Current
Limit 2
Error
Amp
VOUT1
Enable 1
GND
EN2
EN1
4
Advanced Power
Electronics Corp.
APE8837
TYPICAL PERFORMANCE CHARACTERISTICS
VIN VS. Shutdown Current
5
80
4
Shutdown Current (uA)
ICCQ (uA)
VIN VS. ICCQ
100
60
40
20
3
2
1
Channel1+Channel2
IOUT 1=IOUT2=0mA
VEN1=VEN2=0V
0
0
2.5
3
3.5
4
4.5
5
5.5
6
2.5
3
3.5
VIN (V)
1.216
3.38
1.212
3.36
1.208
3.34
1.204
3.32
1.2
1.196
6
3.28
3.26
1.188
3.24
1.184
1.18
4.5
5
5.5
IOUT =1mA
3.22
IOUT =1mA
4
5.5
3.3
1.192
3.5
5
VIN VS.VOUT
3.4
VOUT (V)
VOUT (V)
VIN VS. VOUT
3
4.5
VIN (V)
1.22
2.5
4
3.2
6
4
4.5
VIN (V)
IOUT VS. VOUT
5
VIN (V)
5.5
6
IOUT VS. VOUT
1.3
3.4
1.28
1.26
3.35
1.22
VOUT (V)
VOUT (V)
1.24
1.2
1.18
3.3
1.16
3.25
1.14
1.12
VIN=5V
VIN=5V
1.1
3.2
0
50
100
IOUT (mA)
150
200
0
50
100
150
200
IOUT (mA)
5
Advanced Power
Electronics Corp.
APE8837
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
IOUT VS. Dropout Voltage
Temperature VS. ICCQ
1200
100
VOUT =1.2V
80
800
600
VOUT =1.8V
ICCQ (uA)
Dropout Voltqge (mV)
1000
60
40
400
VOUT =2.8V
VOUT =3.3V
200
20
Channel1+Channel2
IOUT1=IOUT2=0mA
0
0
50
100
150
-40℃
200
-20℃
0℃
IOUT (mA)
50℃
85℃
Temperature VS. VOUT
Temperature VS. VOUT
1.26
1.24
VOUT (V)
3.35
3.3
3.25
VIN=5V
1.22
1.2
1.18
VIN=5V
IOUT =1mA
IOUT =1mA
1.16
3.2
-40℃
105℃ 125℃
Temperature
3.4
VOUT (V)
25℃
-20℃
0℃
25℃
50℃
Temperature
85℃
105℃ 125℃
-40℃
-20℃
0℃
25℃
50℃
85℃
105℃ 125℃
Temperature
6
Advanced Power
Electronics Corp.
APE8837
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
Line Transient
Line Transient
Load Transient
Load Transient
EN ON (EN1)
EN ON (EN2)
7
Advanced Power
Electronics Corp.
APE8837
FUNCTION DESCRIPTION
The APE8837 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
EN1 and EN2 pin start and stop the corresponding outputs independently. 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.
Dropout Voltage
A regulator’s minimum input-output voltage differential, or dropout voltage, determines the lowest usable
supply voltage. The APE8837 use a P- channel MOSFET pass transistor, its dropout voltage is function of
drain-to-source on-resistance RDS (ON) multiplied by the load current.
VDROPOUT = VIN-VOUT = RDS(ON) x IOUT
Current Limit
Each channel of APE8837 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 within 250mA.
Thermal Shutdown Protection
Thermal Shutdown protection limits total power dissipation of APE8837. 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 APE8837 in the event of fault conditions. For
continuous operation, the absolute maximum operating junction temperature rating of TJ = +125°C should not
be exceeded.
8
Advanced Power
Electronics Corp.
APE8837
APPLICATION INFORMATION
Like any low-dropout regulator, the APE8837 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 2.2uF 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
1uF over the entire operating temperature range.
Output Capacitor
The APE8837 is designed specifically to work with very small ceramic output capacitors. A ceramic capacitor
(temperature characteristics X7R, X5R) in 1uF is suitable for the APE8837 application. The recommended
minimum capacitance for the device is 2.2uF, 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 APE8837 series can deliver a current of up to 200mA/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 x IGND
The final operating junction temperature for any set of conditions can be estimated by the following thermal
equation:
PD (MAX) = (TJ (MAX) - TA) / RthJA
Where TJ (MAX) is the maximum junction temperature of the die (125°C) and TA is the maximum ambient
temperature. The thermal resistance from junction to ambient (RθJA) of SOT-26 package at recommended
minimum footprint is 250°C/W.
9
Advanced Power
Electronics Corp.
APE8837
MARKING INFORMATION
SOT-26 / TSOT-26
Part Number : RP
Output Voltage: see Identification Code
RP&SS
Date Code
SS:2004, 2008, 2012…
SS:2003, 2007, 2011...
SS:2002, 2006, 2010…
SS:2001, 2005, 2009...
DFN 2x2-6L
Part Number : RP
Output Voltage: see Identification Code
RP&
YWS
Date Code (YWS)
Y : Year
W : Week
S : Sequence
Identification
Code
V OUT1+V OUT2
Identification
Code
V OUT 1+V OUT 2
Identification
Code
V OUT1+V OUT2
A
1.5V+2.8V
J
2.8V+3.3V
S
1.2V+1.8V
B
1.8V+2.8V
K
3.0V+3.0V
T
1.5V+3.3V
C
1.8V+2.6V
L
3.0V+3.3V
U
2.5V+2.5V
D
1.8V+3.3V
M
3.3V+3.3V
V
1.5V+3.0V
E
2.5V+2.8V
N
1.2V+3.3V
W
1.2V+2.8V
F
2.8V+1.2V
P
1.8V+3.0V
X
1.2V+1.2V
G
2.8V+1.8V
Q
1.5V+2.5V
Y
2.8V+1.5V
H
2.8V+3.0V
R
3.3V+1.8V
Z
2.8V+2.8V
10