Power APE2902Y5-28 Micropower vfm step-up dc/dc converter Datasheet

Advanced Power
Electronics Corp.
APE2902
MICROPOWER VFM STEP-UP DC/DC CONVERTER
FEATURES
DESCRIPTION
The APE2902 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
APE2902 accept a positive input voltage from start-up
voltage to VOUT and convert it to a higher output voltage in
the 2.5 to 5V range.
The APE2902 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 APE2902 is suitable to be used in battery powered
equipment where low noise, low ripple and ultra low supply
current are required. Operating shutdown function is outside
controlling. If EN connects to GND, the IC was been shut
down and then the supply current is lower to 1uA.The
APE2902 is available in very small package: SOT-23-5L.
Typical applications are pagers, cameras & video
camera, cellular telephones, wireless telephones, palmtop
computer, battery backup supplies, battery powered
equipment.
Very Low Supply Current is 22uA (typ.)
Maximum Shutdown Current <1uA
Output Voltage is Available form 2.5V 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
Internal Soft-Start
Low Profile: SOT-23-5L Pb-Free
TYPICAL APPLICATION
VIN
1
L1
D1
B140
2
1
VOUT
2
47uH
C1
100uF
C2
0.1uF
U1
NC
EN
Enable Input
SW
GND
OUT
C4
C3
47uF
0.1uF
APE2902
ORDER/MARKING INFORMATION
APE2902XX-XX
Vout
Package Type
22
: 2.2V
Y5 : SOT-23-5L
25 : 2.5V
Y5R : SOT-23-5L
26 : 2.6V
27 : 2.7V
:
:
50 : 5.0V
Data and specifications subject to change without notice
t&XYW
WW : 01~26(A~Z)
27~52(A~Z)
Year : 8 = 2008
A = 2010
Identification Code
Identification Code see page8.
1
200907313
Advanced Power
Electronics Corp.
APE2902
ABSOLUTE MAXIMUM RATINGS (TA= 25
C)
o
VIN Supply Voltage(VIN) …………………………… 5.5 V
SW Voltage(VSW ) …………………………………… 5.5 V
OUT Voltage(VOUT) …………………………………
5.5 V
EN Pin Voltage(VEN) ………………………………… 5.5 V
Power Dissipation(PD) ……………………………… ( TJ-TA ) / Rthja W
Storage Temperature Range(TST) ………………… -40°C To 150°C
Operating Junction Temperature Range(TOP) …… -20°C To + 100°C
Thermal Resistance from Junction to Case(RthJC)
110°C/W
Thermal Resistance from Junction to Ambient(Rth JA)
250°C/W
Note : Rth JA is measured with the PCB copper area of approximately 1 in2(Multi-layer).
PACKAGE INFORMATION
Top View
NC
EN
5
4
Top View
GND
SW
5
4
AP2902Y5
AP2902Y5R
1
1
2
3
2
3
SW GND VOUT
EN VOUT NC
SOT-23-5L
SOT-23-5L
ELECTRICAL SPECIFICATIONS
( VIN=1.8V, IOUT=10mA, TA=25 oC, unless otherwise specified)
Parameter
Output Voltage Accuracy
Start-up Voltage(VIN-VF)(Note 1)
SYM
TEST CONDITION
△VOUT
MIN
TYP
MAX
UNITS
-5
-
5
%
VSTART-UP
IOUT=1mA, VIN =rising from 0 to 2V
-
0.8
1.2
V
Hold-on Voltage
VHOLD
IOUT=1mA, VIN =falling from 2 to 0V
0.6
-
-
V
Supply Current
ISUPPLY
No Load
-
22
-
uA
ISD
VEN=0V
-
-
1
uA
ISW =150mA
-
850
-
mΩ
VSW =4V, Forced VOUT=3.8V
-
-
0.5
uA
-
150
-
KHz
-
77
-
%
Shutdown Current
Internal Switch RDSON
Internal Leakage Current
RSW(DSON)
ISW(leak)
Maximum Oscillator Frequency
FOSC
Oscillator Duty On
DON
To be measured on SW pin
VENH
Driver ON
0.75
-
-
VENL
Driver OFF
-
-
0.2
IENH
VEN=VIN
-
-
0.1
IENL
VEN=0V
-
-
-0.1
Vout=2.5V~3.0V, IOUT=50mA
-
82
-
%
Vout=3.1V~4.0V, IOUT=50mA
-
83
-
%
Vout=4.1V~5.0V, IOUT=50mA
-
87
-
%
Enable Input Threshold
Enable Input Current
EFFICIENCY
η
V
uA
Note 1: The minimum input voltage for the IC start-up is strictly a function of the VF catch diode.
2
Advanced Power
Electronics Corp.
APE2902
PIN DESCRIPTIONS
PIN SYMBOL
PIN DESCRIPTION
Switch Pin. Connect External Inductor & Diode here.
SW
GND
GND Pin
OUT
EN
Output Voltage
Chip Enable Pin
BLOCK DIAGRAM
+
-
OUT
VREF
SW
LIMITER AMP.
- +
VFM
CONTROL
ERROR AMP.
Driver
Chip Enable
GND
EN
OPERATION
The APE2902 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 150KHz). An over
current conditions, through the internal power switch, causes a voltage drop VSW=RDS(ON)
x ISW and the VSW 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 150KHz 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 RDS(ON), 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.
3
Advanced Power
Electronics Corp.
APE2902
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.
Inductor Selection
A 47µH inductor is recommended for most APE2902 applications. However, the
inductance value is not critical, and the APE2902 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 APE2902
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 APE2902. These items are also illustrated graphically in below.
1. The power traces, including the GND trace, the SW trace and the VIN 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.
APE2902
TYPICAL PERFORMANCE CHARACTERISTICS
IOUT=50mA, Output Voltage vs. Temperature
TA=25℃ , Input Voltage vs. Output Voltage
3.05
3.50
VIN=2.4V
2.50
VIN=0.9V
VIN=1.8V
VIN=1.2V
VIN=1.5
2.00
1.50
1.00
3.00
Output Vlotage (V)
Output Voltage (V)
3.00
VIN=2.4V
VIN=1.8V
VIN=1.2V
2.95
2.90
2.85
0.50
3.10
1.0
3.00
0.9
10
0
0.1
0.0
1
50
25
0
2.30
0.3
0.2
10
0
2.40
75
IOUT=150mA
IOUT=200mA
IOUT=250mA
Temperature (℃ )
10
0
2.50
0.4
75
IOUT=100mA
0.5
50
IOUT=0mA
2.60
0.6
25
IOUT=50mA
2.70
0.7
10
2.80
Start-up Vlotage (V)
0.8
2.90
-2
0
75
Start-up Voltage vs. Output Current
VIN=1.8V, Output Voltage vs. Temperature
Output Current (mA)
IOUT=1mA, Start-up Voltage vs. Temperature
IOUT=1mA, Hold-On Voltage vs. Temperature
1.0
0.4
0.9
0.4
Hold-On Vlotage (V)
0.8
0.7
0.6
0.5
0.4
0.3
0.3
0.3
0.2
0.2
0.1
0.2
0.1
0.1
10
0
75
50
0
10
0
75
50
0
-2
0
25
Temperature (℃)
-2
0
0.0
0.0
25
Output Vlotage (V)
50
Temperature (℃ )
Output Current (m A)
Start-up Vlotage (V)
25
-2
0
25
0
22
5
20
0
17
5
15
0
12
5
10
0
75
50
25
10
0
0
2.80
0.00
Temperature (℃ )
5
Advanced Power
Electronics Corp.
APE2902
TYPICAL PERFORMANCE CHARACTERISTICS
Input Voltage vs. Supply Current
Supply Current vs. Temperature
50
800
45
700
VIN=1.2V
35
30
APE2902-33
APE2902-30
25
20
15
APE2902-28
Supply Current (uA)
600
500
400
VIN=1.5V
300
VIN=1.8V
200
10
100
5
VIN=2.4V
Maximum Oscillator Frequency vs. Temperature
90
160
80
60
40
40
30
20
75
10
0
-2
0
0
50
10
0
25
20
0
10
0
50
Temperature (℃ )
10
0
80
60
75
100
70
50
120
25
140
0
Oscillator Duty-On (%)
100
180
Temperature (℃ )
APE2902-30, IOUT=50mA, Efficiency vs. Temperature
APE2902-30, Efficiency vs. Output Current
90
90
VIN=2.4V
88
70
VIN=1.8
86
60
VIN=0.9V
50
VIN=1.2V
Efficiency (%)
80
VIN=1.5V
40
30
VIN=2.4V
VIN=1.8V
84
82
VIN=1.2V
80
Output Current (mA)
75
50
25
-2
0
25
0
22
5
20
0
17
5
15
0
12
5
10
0
74
75
76
0
50
10
0
78
20
25
75
Oscillator Duty-On vs. Temperature
200
-2
0
Maximum Oscillator Frequency
(KHz)
50
Temperature (℃ )
Input Voltage (V)
Efficiency (%)
25
-2
0
2.
4
1.
8
1.
5
1.
2
0
0
0
10
0
Supply Current (uA)
40
Temperature (℃ )
6
Advanced Power
Electronics Corp.
APE2902
TYPICAL PERFORMANCE CHARACTERISTICS
SW Switching Current Limit vs. Temperature
VIN=1.8V, Efficiency vs. Temperature
90
900
IOUT=100mA
IOUT=150mA
75
IOUT=200mA
70
IOUT=250mA
65
60
55
50
880
860
840
820
800
780
760
Temperature (℃ )
Enable Off Sequence
10
0
75
50
25
0
10
0
75
50
25
0
-2
0
740
-2
0
Efficiency (%)
80
SW Switching Current Limit (mA)
IOUT=50mA
85
Temperature (℃ )
Enable On Sequence
VIN
VIN
VOUT
VOUT
SW
SW
VEN
VEN
VIN=1.8V, VOUT=2.8V, IOUT=10mA, EN=5 to 0V
VIN=1.8V, VOUT=2.8V, IOUT=10mA, EN=0 to 5V
Ch1: VIN, 1V/div
Ch1: VIN, 1V/div
Ch2: VOUT, 1V/div
Ch2: VOUT, 1V/div
Ch3: VSW, 2V/div
Ch3: VSW, 2V/div
Ch4: VEN, 5V/div
Ch4: VEN, 5V/div
7
ADVANCED POWER ELECTRONICS CORP.
Package Outline : SOT-23-5L
Millimeters
SYMBOLS
MIN
NOM
MAX
A
1.00
1.10
1.30
A1
0.00
---
0.10
A2
0.70
0.80
0.90
b
0.35
0.40
0.50
C
0.10
0.15
0.25
D
2.70
2.90
3.10
E
1.50
1.60
1.80
e
---
1.90(TYP)
---
H
2.60
2.80
3.00
L
0.37
---
---
θ1
1°
5°
9°
e2
---
0.95(TYP)
---
Note 1:Package Body Sizes Exclude Mold Flash Protrusions or Gate Burrs.
Note 2:Tolerance ± 0.1000 mm(4mil) Unless Otherwise Spe- cified.
Note 3:Coplanarity:0.1000 mm
Note 4:Dimension L Is Measured in Gage plane.
Part Marking Information & Packing : SOT-23 -5L
Part Number : t&X (Identification Code)
Date Code
t&XSS
Part Number
Identificatio
n Code
Part Number
Identificatio
n Code
APE2902Y5/Y5R-2.2V
tO/tO1
APE2902Y5/Y5R-3.8V
tn/tn1
APE2902Y5/Y5R-2.5V
ta/ta1
APE2902Y5/Y5R-3.9V
to/to1
APE2902Y5/Y5R-2.6V
tb/tb1
APE2902Y5/Y5R-4.0V
tp/tp1
APE2902Y5/Y5R-2.7V
tc/tc1
APE2902Y5/Y5R-4.1V
tq/tq1
APE2902Y5/Y5R-2.8V
td/td1
APE2902Y5/Y5R-4.2V
tr/tr1
APE2902Y5/Y5R-2.9V
te/te1
APE2902Y5/Y5R-4.3V
ts/ts1
APE2902Y5/Y5R-3.0V
tf/tf1
APE2902Y5/Y5R-4.4V
tt/tt1
APE2902Y5/Y5R-3.1V
tg/tg1
APE2902Y5/Y5R-4.5V
tu/tu1
APE2902Y5/Y5R-3.2V
th/th1
APE2902Y5/Y5R-4.6V
tv/tv1
APE2902Y5/Y5R-3.3V
ti/ti1
APE2902Y5/Y5R-4.7V
tw/tw1
APE2902Y5/Y5R-3.4V
tj/tj1
APE2902Y5/Y5R-4.8V
tx/tx1
APE2902Y5/Y5R-3.5V
tk/tk1
APE2902Y5/Y5R-4.9V
ty/ty1
APE2902Y5/Y5R-3.6V
tl/tl1
APE2902Y5/Y5R-5.0V
tz/tz1
APE2902Y5/Y5R-3.7V
tm/tm1
8
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