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ZCC9266
1ZCC9266-06 June 2009
Featuresl 1.0V Low Start-up Input Voltagel High Supply Capability to Deliver 3.3V 100mA with
1 Alkaline Celll 17µA Quiescent (Switch-off) Supply Currentl Zero Shutdown Mode Supply Currentl 90% Efficiencyl 450kHz Fixed Switching Frequencyl Providing Flexibility for Using Internal and External
Power Switchesl Small SOT-26 & SOT89-5 Package
Pin Configurations
Applicationsl PDAl DSCl LCD Panell RF-Tagsl MP3l Portable Instrumentl Wireless Equipment
Tiny Package, High Efficiency, Step-up DC/DC Converter
Ordering Information
General DescriptionThe ZCC9266 is a compact, high efficiency, and low voltagestep-up DC/DC converter with an Adaptive Current ModePWM control loop, includes an error amplifier, rampgenerator, comparator, switch pass element and driverin which providing a stable and high efficient operationover a wide range of load currents. It operates in stablewaveforms without external compensation.
The low start-up input voltage below 1V makes ZCC9266suitable for 1 to 4 battery cells applications of providingup to 300mA output current. The 450kHz high switchingrate minimized the size of external components. Besides,the 17µA low quiescent current together with highefficiency maintains long battery lifetime.
The output voltage is set with two external resistors. Bothinternal 2A switch and driver for driving external powerdevices (NMOS or NPN) are provided.
(TOP VIEW)
SOT-26
Marking InformationFor marking information, contact our sales representativedirectly or through a distributor located in yourarea, otherwise visit our website for detail.
ZCC9266
Package TypeE : SOT-26X5 : SOT-89-5
Operating Temperature RangeC : Commercial StandardP : Pb Free with Commercial Standard
4
2
3
5
61CE
EXT
GND LX
VDD
FB
CE VDD FB
LXGND
1 2 3
45
SOT-89-5
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Typical Application Circuit
Figure 1. ZCC9266 Typical Application for Portable Instruments
Figure 2. High Voltage Applications
VDD
CE
EXT
GND
LX
FB
ZCC9266
CVDD1uF
R1860k/620k
R2100k
L1
4.7uHVIN
D1
1N5819C4100uF
+RVDD100
Q1N MOS
C30.1uF
C21uF
+
C1100uF
12V/9V300mA
RM0.22
3.1V to 5V for 12V2.8V to 5V for 9V
VDD
CE
EXT GND
LX
FB
C21uF
R11.6M/3M
R2980k/1M
+
L1
3.3 to 10 uHVIND1
1N5819VOUT3.3V/5V
C3100uF
C1100uF
+
ZCC9266
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ZCC9266
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Figure 3. ZCC9266 for Higher Current Applications
Figure 4. ZCC9266 for Multi-Output Applications
VDD
CE EXT
GND
LX
FB
ZCC9266
C21uF
R11.6M/3M
R2980k/1M
+
L1
3.3 to 10 uHVIND1
1N5819
VOUT3.3V/5VC3
100uF
C1100uF
+
Q1N MOS
VDD
CE
EXTGND
LX
FBZCC9266
C21uF
R1620k
R2100k
L1
4.7uHVIN
R3100
Q1
N MOSC71uF
C510uF
C60.1uF
C81uF
C410uF
C310uF
C11uF
VOUT2+18V10mA
VOUT1+9V10mA
VOUT3-9V10mA
3.3V/5V
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Pin No.
ZCC9266CX5 ZCC9266CE Pin Name Pin Function
1 1 CE Chip enable ZCC9266 gets into shutdown mode when CE pin set to low.
-- 2 EXT Output pin for driving external NMOS
5 3 GND Ground
4 4 LX Pin for switching
2 5 VDD Input positive power pin of ZCC9266
3 6 FB Feedback input pin Internal reference voltage for the error amplifier is 1.25V.
Function Block Diagram
Functional Pin Description
Test Circuit
+-
Loop Control Circuit1.25V
VDD
R2
Q2N MOS
CE
FB Q1N MOS
R1
LX
Shut Down
Over Temp.Detector
VDD ZCC9266EXT
GND
VDD
CE
EXT GND
LX
FB
ZCC9266
C21uF
R11.6M/3M
R2980k/1M
L1
10uHVIN
D1
1N5819
VOUT3.3V/5V
C3100uF
C4102
A I (VDD)
A +
I (VIN)
+
C1100uF
C5106
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Absolute Maximum Ratings
Electrical Characteristics
l Supply Voltage --------------------------------------------------------------------------------------------------- −0.3V to 7Vl LX Pin Switch Voltage ------------------------------------------------------------------------------------------ −0.3V to 7Vl Other I/O Pin Voltages ----------------------------------------------------------------------------------------- −0.3V to (VDD + 0.3V)l LX Pin Switch Current ------------------------------------------------------------------------------------------2.5Al EXT Pin Driver Current -----------------------------------------------------------------------------------------200mAl Package Thermal Resistance
SOT-26, θJC -------------------------------------------------------------------------------------------------------145 °C/WSOT-89-5, θJC ----------------------------------------------------------------------------------------------------45 °C/W
l Operating Junction Temperature ----------------------------------------------------------------------------125 °Cl Storage Temperature Range---------------------------------------------------------------------------------- −65°C to +150°C
(VIN = 1.5V, VDD set to 3.3V, Load Current = 0, TA = 25°C, unless otherwise specified)
NOTE:Absolute Maximum ratings are threshold limit values that must not be exceeded even for an instant under any conditions.Moreover, such values for any two items must not be reached simultaneously. Operation above these absolute maximumratings may cause degradation or permanent damage to the device. These are stress ratings only and do not necessarilyimply functional operation below these limits
Parameter Symbol Test Conditions Min Typ Max Units
Start-UP Voltage VST IL = 1mA -- 0.98 1.05 V
Operating VDD Range VDD VDD pin voltage 2 -- 6 V
Shutdown Current I (VIN) IOFF CE Pin = 0V, VIN = 4.5V -- 0.01 1 µA
Switch-off Current I (VDD) ISWITCH OFF VIN = 6V -- 17 25 µA
Continuous Switching Current ISWITCH VIN = CE= 3.3V, VFB = GND 0.4 0.55 0.7 mA
No Load Current I (VIN) INO LOAD VIN = 1.5V, VOUT = 3.3V -- 75* -- µA
Feedback Reference Voltage VREF Close Loop, VDD = 3.3V 1.225 1.25 1.275 V
Switching Frequency FS VDD = 3.3V 425 500 575 kHz
Maximum Duty DMAX VDD = 3.3V 85 95 -- %
LX ON Resistance VDD = 3.3V -- 0.3 1.1 Ω
Current Limit Setting ILIMIT VDD = 3.3V 1.6 2 2.6** A
EXT ON Resistance to VDD VDD = 3.3V -- 5 8.5 Ω
EXT ON Resistance to GND VDD = 3.3V -- 5 8.5 Ω Line Regulation ∆VLINE VIN = 3.5 ~ 6V, IL = 1mA -- 1.5 10 mV/V
Load Regulation ∆VLOAD VIN = 2.5V, IL = 1 ~ 100mA -- 0.25*** -- mV/mA
CE Pin Trip Level VDD = 3.3V 0.4 0.8 1.2 V Temperature Stability for Vout TS -- 50 -- ppm/°C
Thermal Shutdown Hysterises ∆TSD -- 10 -- °C
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Note :
* No Load Current is highly dependent on practical system design and component selection that cannot be covered by production
testing. Typical No Load Current is verified by typical application circuit with recommended components. No Load Current
performance is guaranteed by Switch Off Current and Continuous Switching Current.
** Current Limit is guaranteed by design at TA = 25°C.
***Load Regulation is not tested at production due to practical instrument limitation. Load Regulation performance is dominantly
dependent on DC loop gain and LX ON Resistance that are guaranteed by “Line Regulation” and “LX ON Resistance” tests in
production.
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Typical Operating Characteristics (Refer to Test Circuit)
Efficiency vs. Output Current
0.1 1 10 100 1000Output Current (mA)
Effi
cien
cy (%
)
95
90
85
80
75
70
VOUT = 3.3V, TA = 25°C
VIN = 3.0V
VIN = 2.5V
VIN = 2.0V
VIN = 1.5V
VIN = 1.0V
Supply Current I(VIN) vs. Input Voltage
30
40
50
60
70
80
90
1.5 2 2.5 3 3.5Input Voltage (V)
Sup
ply
Cur
rent
( A
)
VOUT = 3.3V @ no load
µ
Supply Current I(VIN) vs. Input Voltage
0
30
60
90
120
150
180
1.5 2.0 2.5 3.0 3.5 4.0 4.5Input Voltage (V)
Sup
ply
Cur
rent
( A
)1
VOUT = 5V @ no load
µ
Input Current I(VDD) vs. Input Voltage
15
16
17
18
19
20
21
2.5 3.0 3.5 4.0 4.5 5.0
Input Voltage (V)
Inpu
t Cur
rent
( A
)
VOUT = 5V @ no load
µ
Efficiency vs. Output Current
000 001 010 100 1000Output Current (mA)
Effi
cien
cy (%
)
95
90
85
80
75
70
VOUT = 5V, TA = 25°C
VIN = 4.0VVIN = 3.5VVIN = 3.0VVIN = 2.5VVIN = 2.0V
VIN = 1.5V
Input Current I(VDD) vs. Output Current
0
50
100
150
200
250
0.01 0.1 1 10 100 1000Output Current (mA)
Inpu
t Cur
rent
( A
)
VIN = 3V, VOUT = 5V
µ
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VIN = 2V, VOUT = 3.3V @ 200mA
Out
put R
ippl
e L
X W
ave
Form
Time (1µs/Div)
LX Pin Wave Form & Output Ripple
VIN = 1V, VOUT = 3.3V @ 100mA
LX Pin Wave Form & Output Ripple
Out
put R
ippl
e L
X W
ave
Form
Time (1µs/Div)
LX Pin Wave Form & Output Ripple
VIN = 1V, VOUT = 3.3V @ 10mA
Out
put R
ippl
e L
X W
ave
Form
Time (1µs/Div)
VIN = 2V, VOUT = 3.3V @ 10mA
Out
put R
ippl
e L
X W
ave
Form
Time (1µs/Div)
LX Pin Wave Form & Output Ripple
Start Up Voltage vs. Output Current
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
0 30 60 90 120 150 180 210Output Current (mA)
Sta
rt U
p V
olta
ge (V
)
VOUT = 3.3V
(In C.R. mode)
Swichting Frequency vs. VDD Pin Voltage
100
200
300
400
500
600
0 1 2 3 4 5 6
VDD Pin Voltage (V)
Sw
itchi
ng R
ate
Freq
uenc
y (K
Hz)
. VIN = 2.4V to 2.8V
VIN = 1.2V to 2.2V
VIN = 3V to 5.6V
Sw
itchi
ng F
requ
ency
(kH
z)
Switching Frequency
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VIN = 3V, VOUT = 3.3V @ 200mA
Out
put R
ippl
e L
X W
ave
Form
Time (1µs/Div)
LX Pin Wave Form & Output Ripple
VIN = 2V, VOUT = 5V @ 200mA
Out
put R
ippl
e L
X W
ave
Form
Time (1µs/Div)
LX Pin Wave Form & Output Ripple
VIN = 2V, VOUT = 5V @ 20mA
Out
put R
ippl
e L
X W
ave
Form
Time (1µs/Div)
LX Pin Wave Form & Output Ripple
VIN = 3V, VOUT = 5V @ 200mA
Out
put R
ippl
e L
X W
ave
Form
Time (1µs/Div)
LX Pin Wave Form & Output Ripple
VIN = 3V, VOUT = 5V @ 20mA
Out
put R
ippl
e L
X W
ave
Form
Time (1µs/Div)
LX Pin Wave Form & Output Ripple
VIN = 3V, VOUT = 3.3V @ 10mA
Out
put R
ippl
e L
X W
ave
Form
Time (1µs/Div)
LX Pin Wave Form & Output Ripple
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VIN = 4.5V, VOUT = 5V @ 200mA
Out
put R
ippl
e L
X W
ave
Form
Time (1µs/Div)
LX Pin Wave Form & Output Ripple
VIN = 4.5V, VOUT = 5V @ 20mA
Out
put R
ippl
e L
X W
ave
Form
Time (1µs/Div)
LX Pin Wave Form & Output Ripple
VIN = 3V, VOUT = 3.3V
IOUT = 10mA 200mA
Time (50µs/Div)
Transient ResponseO
utpu
t Tra
nsie
nt V
olta
ge
Out
put T
rans
ient
Vol
tage
Time (50µs/Div)
Transient Response VIN = 2V, VOUT = 3.3V
IOUT = 10mA 200mA
Time (50µs/Div)
Transient Response
VIN = 4.5V, VOUT = 5V
IOUT = 10mA 200mA
Out
put T
rans
ient
Vol
tage
Time (50µs/Div)
Transient Response
VIN = 3V, VOUT = 5V
IOUT = 10mA 200mA
Out
put T
rans
ient
Vol
tage
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Output Voltage vs. Temperature
4.84
4.86
4.88
4.9
4.92
4.94
4.96
4.98
5
-40 -10 20 50 80 110 140
Temperature
Out
put V
olta
ge(V
)
VIN = 3V, VOUT = 5V, IOUT = 100mA
(°C)
Output Voltage vs. Temperature
3.2
3.22
3.24
3.26
3.28
3.3
3.32
3.34
-40 -10 20 50 80 110 140
Temperature
Out
put V
olta
ge(V
)
VIN = 1.8V, VOUT = 3.3V, IOUT = 100mA
(°C)
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Application Information
Output Voltage Setting
Referring to Typical Application Circuits, the outputvoltage of the switching regulator (VOUT) can be set withEq.1.
Feedback Loop Design
Referring to Typical Application Circuits. The selectionof R1 and R2 based on the trade-off between quiescentcurrent consumption and interference immunity is statedbelow:
l Follow Eq.1
l Higher R reduces the quiescent current (Path current= 1.25V/R2), however resistors beyond 5MΩ are notrecommended.
l Lower R gives better noise immunity, and is lesssensitive to interference, layout parasitics, FB nodeleakage, and improper probing to FB pins.
l A proper value of feed forward capacitor parallel withR1 can improve the noise immunity of the feedbackloops, especially in an improper layout. An empiricalsuggestion is around 0~33pF for feedback resistors ofMΩ, and 10nF~0.1µF for feedback resistors of tens tohundreds KΩ.
For applications without standby or suspend modes,lower values of R1 and R2 are preferred. For applicationsconcerning the current consumption in standby orsuspend modes, the higher values of R1 and R2 areneeded. Such “high impedance feedback loops” aresensitive to any interference, which require careful layoutand avoid any interference, e.g. probing to FB pin.
Prober ParasiticsFB Pin
R1
R2
VOUT
_Q+
Layout Guidel A full GND plane without gap break.
l VDD to GND noise bypass − Short and wide connectionfor the 1µF MLCC capacitor between Pin5 and Pin3.
l VIN to GND noise bypass − Add a capacitor close to L1inductor, when VIN is not an idea voltage source.
l Minimized FB node copper area and keep far awayfrom noise sources.
l Minimized parasitic capacitance connecting to LX andEXT nodes, which may cause additional switching loss.
Board Layout Example (2-Layer Board)
(Refer to Typical Application Circuits Figure 2 for theboard)
- Top Layer -
- Bottom Layer -
×OUTR1
V = ( 1+ ) 1.25VR2
Eq.1
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ZCC9266
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Outline Dimension
AA1
e
b
B
D
C
H
L
SOT- 26 Surface Mount Package
Dimensions In Millimeters Dimensions In Inches Symbol
Min Max Min Max
A 0.889 1.295 0.035 0.051
A1 0.000 0.152 0.000 0.006
B 1.397 1.803 0.055 0.071
b 0.250 0.559 0.010 0.022
C 2.591 2.997 0.102 0.118
D 2.692 3.099 0.106 0.122
e 0.838 1.041 0.033 0.041
H 0.080 0.254 0.003 0.010
L 0.300 0.610 0.012 0.024
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A
A
He e
b b1 b
D
C B
C1
D1b1
Dimensions In Millimeters Dimensions In Inches Symbol
Min Max Min Max
A 1.400 1.600 0.055 0.063
b 0.360 0.520 0.014 0.020
B 2.400 2.600 0.094 0.102
b1 0.406 0.533 0.016 0.021
C -- 4.250 -- 0.167
C1 0.800 -- 0.031 --
D 4.400 4.600 0.173 0.181
D1 -- 1.700 -- 0.067
e 1.400 1.600 0.055 0.063
H 0.380 0.430 0.014 0.017
5-Lead SOT-89 Surface Mount Package
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