■
General Description
■
Features
◆90% Efficiency
◆High Supply Capability to Deliver 3.3V 100mA
with 1 Alkaline cell
◆17µA Quiescent (switch-off) Supply Current
◆450KHz Fixed Switching Frequency
◆Zero Shutdown Mode Supply Current
◆Providing Flexibility for Using Internal and
External Power Switches
◆1.0V Low Start-up Input Voltage
◆Small SOT-26 & SOT89-5 Package
iency maintains long battery lifetime. ■
Ordering Information
Item Package Shipping
SOT89-5 ML9266MRG SOT-26 3000pcs/Reel&Tape
ML9266PRG SOT-89-5 1000pcs/Reel&Tape
■
Applications
■
Package Information
◆LCD Panel
◆DSC
◆MP3
◆Wireless Equipment
◆Portable Instrument
◆PDA
■
Typical Application Circuit
SOT89-5
SOT-23-6
■
SOT-26
SOT-89-5
Pin Name
Pin Function
1 1 CE Chip enable
2 EXT Output
3 5 GND Ground
4 4 LX Switching
5 2 VDD Input
6 3 FB Feedback input 1.25V
Step-up DC/DC converter
generator, comparator, switch pass element and driver
in which providing a stable and high efficient operation
The low start-up input voltage below 1V makes ML9266
the 17µA low quiescent current together with high effic-
The ML9266 is available in small package SOT-26 and
The ML9266 is a small, high efficiency, and low voltage
step-up DC/DC converter with an Adaptive Current Mode
PWM control loop, includes an error amplifier, ramp
rate minimized the size of external components. Besides,
over a wide range of load currents. It operates in stable
waveforms without external compensation.
suitable for 1 to 4 battery cells applications of providing
ML9266
up to 300mA output current. The 450KHz high switching
Vin 3.3~10uH
L1
CE
EXT
VDD
ML9266
GND FB
LX
C3
100uF
C1
100uF
+
R1
1.6M/3M
1N5819
Vout
3.3V/5V
+
D1
R2
980k/1M
1uF
C2
P1 / 5 Rev. C, Sep 2005
■
Function Block Diagram
■
Marking Information
■
Test Circuit
Symbol Descripation
① 9 Step-up DC-DC Converter
② 1 ML9266
③④ Control Code
SOT-26 SOT-89-5
ML9266
IPCore
Vin 10uH
L1
C4
102uF
R1
1.6M/3M
1N5819
Vout
3.3V/5V
D1
CE
EXT
VDD
ML9266
GND
FB
LX
C3
100uF
+
C1
100uF
+
AC5
106uF
R2
980K/1M
I(V
DD)
R3
100
C2
1uF
A
I(V
i
n
)
P2 / 5 Rev. C, Sep 2005
■
Absolute Maximum Ratings (Ta=25
℃
℃℃
℃）
））
）
Paramenter Symbol Ratings Unit
Supply Voltage Vin - 0.3V ～ 7V V
LX Pin Switch Voltage VLX - 0.3 ～ (VDD + 0.8V) V
Other I/O Pin Voltages Vss - 0.3V ～ (VDD + 0.3V) V
Lx Pin Switch Current ILX 2.5 A
EXT Pin Driver Current IEXT 200 mA
Package Thermal Resistance SOT-26 Pd 145 ℃/W
SOT-89-5 45 ℃/W
Operating Junction Temperature Tj 125 ℃
Storage Temperature Range Tstg - 65 ~ +150 ℃
■
Electrical Characteristics
(Vin =1.5V, VDD=3.3V, I=0, Ta = 25
℃
, unless otherwise specified)
Parameter Symbol Test Conditions Min Typ Max Units
Start-UP Voltage VST IL = 1mA V
Operating VDD Range VDD VDD pin voltage V
No Load Current I (VIN) INO LOAD VIN = 1.5V, VOUT = 3.3V µA
Switch-off Current I (VDD) ISWITCH OFF VIN = 6V µA
Shutdown Current I (VIN) IOFF CE Pin = 0V, VIN = 4.5V µA
Feedback Reference Voltage VREF Close Loop, VDD = 3.3V V
Switching Frequency FSVDD = 3.3V KHz
Maximum Duty DMAX VDD = 3.3V %
LX ON Resistance VDD = 3.3V Ω
Current Limit Setting ILIMIT VDD = 3.3V A
EXT ON Resistance to VDD VDD = 3.3V Ω
EXT ON Resistance to GND VDD = 3.3V Ω
Line Regulation △VLINE VIN = 1.5 ~ 2.5V, IL = 1mA mV/V
Load Regulation △VLOAD VIN = 2.5V, IL = 1 ~ 100mA mV/mA
CE Pin Trip Level VDD = 3.3V V
Temperature Stability for Vout TSppm/℃
Thermal Shutdown TSD ℃
Thermal Shutdown Hysterises △TSD ℃
* Note: The CE pin shall be tied to VDD pin and inhibit to act the ON/OFF state whenever the VDD pin voltage
may reach to 5.5V or above.
--
--
-- 10 --
--
--
--
--
0.4
-- 165
-- 10 --
5 --
--
0.8 1.2
0.25 --
50
-- 95 --
5 --
-- 0.3 --
-- 2
1.225 1.25 1.275
-- 450 --
-- 17 --
-- 0.01 1
2 -- 6.5
-- 75 --
-- 0.98 1.05
ML9266
IPCore
P3 / 5 Rev. C, Sep 2005
■
Applications
■
Application Note
●High Current Application ●Output Voltage Setting
switching regulator (VOUT) can be set
R1
R2
●Feedback Loop Design
◆Follow Equation A
◆
recommended.
◆
●High Voltage Application leakage, and improper probing to FB pins.
◆
to hundreds KΩ.
●Multi-Output Applications
feedback needed. Such "high impedance loops" are
sensitive to any interference, which require careful
layout and avoid any interference, e.g. probing to FB pin.
suspend modes, the higher values of R1and R2 are
R1 can improve the noise immunity of the feedback
loops, especially in an improper layout. An empirical
suggestion is around 0~33pF for feedback resistors
of MΩ, and 10nF~0.1µF for feedback resistors of tens
For applications without standby or suspend modes,
lower values of R1 and R2 are preferred. For applications
concerning the current consumption in standby or
=1.25V/R2), however resistors beyond 5MΩare not
Lower R gives better noise immunity, and is less
sensitive to interference, layout parasitics, FB node
A proper value of feed forward capacitor parallel with
R2 based on the trade-off between quiescent current
consumption and interference immunity is stated below:
Higher R reduces the quiescent current (Path current
Referring to application circuits, the output voltage of the
Referring to application circuits, The selection of R1and
VOUT1 = (1 + ) × 1.25V ・・・A
ML9266
IPCore
CE
EXT
VDD
ML9266
GND FB
LX
L1
3.3--10uH
C2
1uF
C5
100uF
D1
C1
100uF
1N5819
Vin
Q1
NMOS
Vout
3.3V/5V
R1
1.6M/3M
R2
980k/1M
+
+
CE
EXT
VDD
ML9266
GND
FB
LX
L1
4.7uH
R1
R2 C2 C1
C3
CVDD
C4
100uF
D1
RVDD
100
RM
12V / 9V
300mA
Vin=3.1V～
5V Vout=12V
+1N5819
Vin=2.8V～ 5V Vout=
9
V
+
Q1
NMOS
CVDD=1uF
RM=0.22
C3=0.1uF
R1=860K/620K
R2=100K
C1=100uF
C2=1uF
R2=100
R1=620K
C6=0.1uF
CE
EXT
VDD
ML
9
266
GND
FB
LX
L1
3.3
--
10uH
C3
10uF
C1
1uF
D1
C4
10uF
1N5819
Vin
3.3V/5V
Vout2
+18V 10mA
R1
R3
100
C2
10uF
Q1
NMOS
C5
10uF
R2
C6
C7
1uF
C8
1uF
Vout1
+9V 100mA
Vout3
-
9V 10mA
P4 / 5 Rev. C, Sep 2005
■
Package Dimensions
●SOT-89-5
Units: mm
Symbol Min Max
A 1.400 1.600
b 0.360 0.520
B 2.400 2.600
b1 0.406 0.533
C -- 4.250
C1 0.800 --
D 4.400 4.600
D1 -- 1.700
e 1.400 1.600
H 0.380 0.430
●SOT-26
Units: mm
Symbol Min Max
A 0.889 1.295
A1 -- 0.152
B 1.397 1.803
b 0.356 0.559
C 2.591 2.997
D 2.692 3.099
e 0.838 1.041
H 0.102 0.254
L 0.356 0.610
ML9266
IPCore
DISCLAIMER:
The information presented in this document does not form part of any quotation or contract, is believed to be
accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any
P5 / 5 Rev. C, Sep 2005