Power APE2903N-40 Micropower vfm step-up dc/dc converter Datasheet

Advanced Power
Electronics Corp.
APE2903
MICROPOWER VFM STEP-UP DC/DC CONVERTER
FEATURES
DESCRIPTION
Very Low Supply Current
Regulated Output Voltage
Wide Range of Output Voltage is Available from
2.2V to 5.0V by 0.1V Steps
Output Voltage Accuracy ±5%
Output Current up to 100mA
Low Ripple and Low Noise
Very Low Start-up Voltage
High Efficiency (Vout = 5V TYP. 87%)
Few External Components
Low Profile: SOT-23, SOT-89 & SOT-23-5L Pb-Free
The APE2903 is a high efficiency VFM Step-up DC/DC
converter for small, low input voltage or battery powered
systems with ultra-low quiescent supply current. The
APE2903 accept a positive input voltage from start-up
voltage to VOUT and convert it to a higher output voltage in
the 2.2V to 5V range.
The APE2903 combine ultra low quiescent supply
current and high efficiency to give maximum battery life. The
high switching frequency and the internally limited peak
inductor current permits the use of small, low cost inductors.
Only three external components are needed an inductor a
diode and an output capacitor.
The APE2903 is suitable to be used in battery powered
equipment where low noise, low ripple and ultra low supply
current are required. The APE2903 is available in very small
package:
SOT-23, SOT-89 & SOT-23-5L.
Typical applications are pagers, cameras & video
camera, cellular telephones, wireless telephones, palmtop
computer, battery backup supplies, battery powered
equipment.
TYPICAL APPLICATION
L1
VIN
47uH
C1
C4
C2
100uF
0.1uF
Vout
D1
B140
SW
GND
NC OUT
APE2903
NC
0.1uF
C3
47uF
ORDERING INFORMATION
APE2903X - XX
Package Type
Y5 : SOT-23-5L
N : SOT-23
G : SOT-89
VOUT
22 : 2.2V
25 : 2.5V
26 : 2.6V
27 : 2.7V
:
50 : 5.0V
Data and specifications subject to change without notice
1
201208301
Advanced Power
Electronics Corp.
APE2903
ABSOLUTE MAXIMUM RATINGS (TA= 25
o
C)
VIN Supply Voltage(VIN) ----------------------------------- 5.5 V
SW Voltage(VSW ) -------------------------------------------
5.5 V
OUT Voltage(VOUT) ----------------------------------------- 5.5 V
Power Dissipation(PD) ------------------------------------- ( TJ-TA ) / Rthja W
Storage Temperature Range(T ST) ---------------------- -40°C To 150°C
Operating Junction Temperature Range(T OP) ------- -20°C To + 100°C
Note. Rthja is measured with the PCB copper area of approximately 1 in2(Multi-layer) that need connect to GND pin of the APE2903.
PACKAGE INFORMATION
Top View
Tab is VOUT
Top View
NC
NC
4
5
SOT-23-5L
1
2
Top View
VOUT
3
SOT-23
SOT-89-3L
3
1
SW GND OUT
2
3
GND VOUT SW
o
Rthjc=180 C/W
SW
o
Rthjc=180 C/W
o
Rthja=250oC/W
Rthjc=100 C/W
Rthja=250oC/W
2
1
GND
Rthja=160 C/W
o
ELECTRICAL SPECIFICATIONS
( VIN=1.8V, VOUT=3V, IOUT=10mA, TA=25 oC, unless otherwise specified)
Parameter
SYM
Output Voltage Accuracy
Start-up Voltage(VIN-VF) (Note)
TEST CONDITION
△VOUT
MIN
TYP
MAX
UNITS
-5
-
5
%
VSTART-UP
IOUT=1mA, VIN =rising from 0 to 2V
-
0.65
0.9
V
Hold-on Voltage
VHOLD
IOUT=1mA, VIN =falling from 2 to 0V
0.6
-
-
V
Supply Current
ISUPPLY
No Load
-
22
-
uA
ILX=150mA
-
850
-
mΩ
VLX=4V, Forced VOUT=3.8V
-
-
0.5
uA
-
150
-
KHz
To be measure on SW pin
-
77
-
%
VOUT=2.5V~3.0V, IOUT=50mA
-
82
-
%
VOUT=3.1V~4.0V, IOUT=50mA
-
83
-
%
VOUT=4.1V~5.0V, IOUT=50mA
-
87
-
%
Internal Switch RDSON
RLX(DSON
Internal Leakage Current
ILX(leak
Maximum Oscillator Frequency
FOSC
Oscillator Duty On
DON
η
Efficiency
Note : The minimum input voltage for the IC start-up is strictly a function of the VF catch diode.
PIN DESCRIPTIONS
PIN SYMBOL
SW
PIN DESCRIPTION
Switch Pin. Connect External Inductor & Diode here.
GND
GND Pin
VOUT
Output Voltage
2
Advanced Power
Electronics Corp.
APE2903
BLOCK DIAGRAM
+
-
VOUT
VREF
SW
LIMITER AMP.
- +
VFM
CONTROL
ERROR AMP.
Driver
GND
OPERATION
The APE2903 architecture is built around a VFM CONTROL logic core, switching
frequency is set through a built in oscillator. TON time is fixed (Typ. 5us) while TOFF time is
determined by the error amplifier output, a logic signal coming from the comparison made
by the Error Amplifier Stage between the signal coming from the output voltage divider
network and the internal Band-Gap voltage reference (Vref). TOFF reaches a minimum
(Typ. 1.7us) when heavy load conditions are met (Clock frequency 150 KHz). An over
current conditions, through the internal power switch, causes a voltage drop VLX=RDSON x
ISW and the VLX limiter block forces the internal switch to be off, so narrowing TON time
and limiting internal power dissipation. In this case the switching frequency may be higher
than the 150 KHz set by the internal clock generator.
VFM control ensures very low quiescent current and high conversion efficiency even
with very light loads. Since the Output Voltage pin is also used as the device Supply
Voltage, the versions with higher output voltage present an higher internal supply voltage
that results in lower power switch RDSON, slightly greater output power and higher
efficiency. Moreover, bootstrapping allows the input voltage to sag to 0.6V (at IOUT=1mA)
once the system is started. If the input voltage exceeds the output voltage, the output will
follow the input, however, the input or output voltage must not be forced above 5.5V.
APPLICATION INFORMATION
INPUT/OUTPUT CAPACITOR SELECTION
The Output Ripple Voltage, as well as the Efficiency, is strictly related to the behavior
of these elements. The output ripple voltage is the product of the peak inductor current
and the output capacitor Equivalent Series Resistance (ESR). Best performances are
obtained with good high frequency characteristics capacitors and low ESR. The best
compromise for the value of the Output Capacitance is 47µF Tantalum Capacitor; Lower
values may cause higher Output Ripple Voltage and lower Efficiency without
compromising the functionality of the device.
An Input Capacitor is required to compensate, if present, the series impedance
between the Supply Voltage Source and the Input Voltage of the Application.
3
Advanced Power
Electronics Corp.
APE2903
INDUCTOR SELECTION
A 47 µ H inductor is recommended for most APE2903 applications. However, the
inductance value is not critical, and the APE2903 will work with inductors in the 33µH to
120µH.
DIODE SELECTION
Schottky diodes with higher current ratings usually have lower forward voltage drop,
larger diode capacitance and fast reverse recovery, it is the ideal choices for APE2903
applications. The forward voltage drop of a Schottky diode represents the conduction
losses in the system, while the diode capacitance (CT or CD) represents the switching
losses. For diode selection, both forward voltage drop and diode capacitance need to be
considered.
PCB LAYOUT GUIDE
When laying out the PC board, the following suggestions should be taken to ensure
proper operation of the APE2903. These items are also illustrated graphically in below.
1. The power traces, including the GND trace, the SW trace and the VCC trace should be
kept short, direct and wide to allow large current flow. Put enough multiply-layer pads
when they need to change the trace layer.
2. Do not trace signal line under inductor.
4
Advanced Power
Electronics Corp.
APE2903
TYPICAL PERFORMANCE CHARACTERISTICS
5
Advanced Power
Electronics Corp.
APE2903
TYPICAL PERFORMANCE CHARACTERISTICS
6
Advanced Power
Electronics Corp.
APE2903
MARKING INFORMATION
SOT-23-5L
Part Number : T&3 (see Identification Code)
T&3SS
Date Code : SS
SS:2004,2008,2012…
SS:2003,2007,2011…
SS:2002,2006,2010…
SS:2001,2005,2009…
SOT-89
Part Number
Identification
Code
Part Number
Identification
Code
APE2903Y5-2.2V
To3
APE2903Y5-3.8V
TN3
APE2903Y5-2.5V
TA3
APE2903Y5-3.9V
TO3
APE2903Y5-2.6V
TB3
APE2903Y5-4.0V
TP3
APE2903Y5-2.7V
TC3
APE2903Y5-4.1V
TQ3
APE2903Y5-2.8V
TD3
APE2903Y5-4.2V
TR3
APE2903Y5-2.9V
TE3
APE2903Y5-4.3V
TS3
APE2903Y5-3.0V
TH3
APE2903Y5-4.4V
TT3
APE2903Y5-3.1V
TG3
APE2903Y5-4.5V
TU3
APE2903Y5-3.2V
TF3
APE2903Y5-4.6V
TV3
APE2903Y5-3.3V
TI3
APE2903Y5-4.7V
TW3
APE2903Y5-3.4V
TJ3
APE2903Y5-4.8V
TX3
APE2903Y5-3.5V
TK3
APE2903Y5-4.9V
TY3
APE2903Y5-3.6V
TL3
APE2903Y5-5.0V
TZ3
APE2903Y5-3.7V
TM3
Identification
Code
Part Number
Identification
Code
APE2903G-2.2V
o
APE2903G-3.8V
N
APE2903G-2.5V
A
APE2903G-3.9V
O
APE2903G-2.6V
B
APE2903G-4.0V
P
APE2903G-2.7V
C
APE2903G-4.1V
Q
APE2903G-2.8V
D
APE2903G-4.2V
R
APE2903G-2.9V
E
APE2903G-4.3V
S
APE2903G-3.0V
H
APE2903G-4.4V
T
APE2903G-3.1V
G
APE2903G-4.5V
U
APE2903G-3.2V
F
APE2903G-4.6V
V
APE2903G-3.3V
I
APE2903G-4.7V
W
APE2903G-3.4V
J
APE2903G-4.8V
X
APE2903G-3.5V
K
APE2903G-4.9V
Y
APE2903G-3.6V
L
APE2903G-5.0V
Z
APE2903G-3.7V
M
Part Number
2903&
YWWS
Output Voltage : (see Identification Code)
Part Number
Date Code (YWWS)
Y : Year
WW : Week
S : Sequence
SOT-23
Part Number : T&3 (see Identification Code)
T&3SS
Date Code : SS
SS:2004,2008,2012…
SS:2003,2007,2011…
SS:2002,2006,2010…
SS:2001,2005,2009…
Part Number
Identification
Code
Part Number
Identification
Code
APE2903N-2.2V
To3
APE2903N-3.8V
TN3
APE2903N-2.5V
TA3
APE2903N-3.9V
TO3
APE2903N-2.6V
TB3
APE2903N-4.0V
TP3
APE2903N-2.7V
TC3
APE2903N-4.1V
TQ3
APE2903N-2.8V
TD3
APE2903N-4.2V
TR3
APE2903N-2.9V
TE3
APE2903N-4.3V
TS3
APE2903N-3.0V
TH3
APE2903N-4.4V
TT3
APE2903N-3.1V
TG3
APE2903N-4.5V
TU3
APE2903N-3.2V
TF3
APE2903N-4.6V
TV3
APE2903N-3.3V
TI3
APE2903N-4.7V
TW3
APE2903N-3.4V
TJ3
APE2903N-4.8V
TX3
APE2903N-3.5V
TK3
APE2903N-4.9V
TY3
APE2903N-3.6V
TL3
APE2903N-5.0V
TZ3
APE2903N-3.7V
TM3
7
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