MINILOGIC ML9266

ML9266
Step-up DC/DC converter
■ General Description
■ Features
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
generator, comparator, switch pass element and driver
in which providing a stable and high efficient operation
over a wide range of load currents. It operates in stable
waveforms without external compensation.
The low start-up input voltage below 1V makes ML9266
suitable for 1 to 4 battery cells applications of providing
up to 300mA output current. The 450KHz high switching
rate minimized the size of external components. Besides,
the 17 µ A low quiescent current together with high effic-
◆ 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.
The ML9266 is available in small package SOT-26 and
■ Ordering Information
SOT89-5
Item
ML9266MRG
ML9266PRG
Package
SOT-26
SOT-89-5
Shipping
3000pcs/Reel&Tape
1000pcs/Reel&Tape
■ Applications
■ Package Information
◆
◆
◆
◆
◆
◆
LCD Panel
DSC
MP3
Wireless Equipment
Portable Instrument
PDA
■ Typical Application Circuit
L1
Vin
C3
100uF
VDD
ML9266
GND
SOT-23-6
■ Pin Configurations
1N5819
C2
1uF
EXT
D1
3.3~10uH
+
CE
SOT89-5
FB
Vout
3.3V/5V
R1
1.6M/3M
LX
+
R2
SOT-26
1
2
3
4
5
6
C1
100uF
980k/1M
P1 / 5
SOT-89-5 Pin NamePin Function
1
CE
Chip enable
EXT Output
5
GND Ground
4
LX
Switching
2
VDD Input
3
FB
Feedback input 1.25V
Rev. D, May 2008
ML9266
IPCore
■ Function Block Diagram
■ Marking Information
■ Test Circuit
Symbol Descripation
Product Code
① ② E1
XX = (00-ZZ) is the code to indicate
③④ XX
wafer lot and production date
i
L1
I(V )
Vin
An
10uH
+
C3
100uF
I(VDD)
A
C2
1uF
LX
+
C4
R1
C1
1.6M/3M 102uF 100uF
C5
106uF
ML9266
FB
EXT
GND
SOT-26
Vout
3.3V/5V
R3
100
VDD
CE
D1
1N5819
R2
980K/1M
SOT-89-5
P2 / 5
Rev. D, May 2008
ML9266
IPCore
■ Absolute Maximum Ratings (Ta=25℃
℃)
Paramenter
Supply Voltage
LX Pin Switch Voltage
Other I/O Pin Voltages
Lx Pin Switch Current
EXT Pin Driver Current
Package Thermal Resistance
SOT-26
SOT-89-5
Operating Junction Temperature
Storage Temperature Range
Symbol Ratings
Vin
- 0.3V ~ 7V
- 0.3 ~ (VDD + 0.8V)
VLX
- 0.3V ~ (VDD + 0.3V)
Vss
2.5
ILX
200
IEXT
Pd
145
45
Tj
125
- 65 ~ +150
Tstg
Unit
V
V
V
A
mA
℃/W
℃/W
℃
℃
■ Electrical Characteristics (Vin =1.5V, VDD=3.3V, I=0, Ta = 25℃, unless otherwise specified)
Parameter
Start-UP Voltage
Operating VDD Range
No Load Current I (VIN)
Switch-off Current I (VDD)
Shutdown Current I (VIN)
Feedback Reference Voltage
Switching Frequency
Maximum Duty
LX ON Resistance
Current Limit Setting
EXT ON Resistance to VDD
EXT ON Resistance to GND
Line Regulation
Load Regulation
CE Pin Trip Level
Temperature Stability for Vout
Thermal Shutdown
Thermal Shutdown Hysterises
Symbol
VST
VDD
INO LOAD
ISWITCH OFF
IOFF
VREF
FS
DMAX
ILIMIT
△VLINE
△VLOAD
Test Conditions
IL = 1mA
VDD pin voltage
VIN = 1.5V, VOUT = 3.3V
VIN = 6V
CE Pin = 0V, VIN = 4.5V
Close Loop, VDD = 3.3V
VDD = 3.3V
VDD = 3.3V
VDD = 3.3V
VDD = 3.3V
VDD = 3.3V
VDD = 3.3V
VIN = 1.5 ~ 2.5V, IL = 1mA
VIN = 2.5V, IL = 1 ~ 100mA
VDD = 3.3V
TS
TSD
△TSD
Min
-2
---1.225
--------0.4
----
Typ
0.98
-75
17
0.01
1.25
450
95
0.3
2
5
5
10
0.25
0.8
50
165
10
Max
1.05
6.5
--1
1.275
--------1.2
----
Units
V
V
µA
µA
µA
V
KHz
%
Ω
A
Ω
Ω
mV/V
mV/mA
V
ppm/℃
℃
℃
* 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.
P3 / 5
Rev. D, May 2008
ML9266
IPCore
■ Applications
■ Application Note
● High Current Application
● Output Voltage Setting
Referring to application circuits, the output voltage of the
switching regulator (VOUT) can be set
L1
3.3--10uH
Vin
+ C5
100uF
VOUT1 = (1 +
1N5819
C2
1uF
VDD
CE
Vout
3.3V/5V
D1
Q1
NMOS
ML9266
GND
+
C1
100uF
LX
FB
◆ Follow Equation A
◆ Higher R reduces the quiescent current (Path current
=1.25V/R2), however resistors beyond 5M Ω are not
R2
980k/1M
recommended.
◆ Lower R gives better noise immunity, and is less
sensitive to interference, layout parasitics, FB node
● High Voltage Application
Vin=3.1V~5V Vout=12V
Vin=2.8V ~ 5V Vout=9V
leakage, and improper probing to FB pins.
L1
C4
100uF
C1=100uF
C2=1uF
D1
4.7uH
RVDD
100
+
C3=0.1uF
R1=860K/620K
R2=100K
RM=0.22
CVDD=1uF
1N5819
CVDD
VDD
CE
・・・A
) × 1.25V
● Feedback Loop Design
Referring to application circuits, The selection of R1and
R2 based on the trade-off between quiescent current
consumption and interference immunity is stated below:
R1
1.6M/3M
EXT
R1
R2
12V / 9V
300mA
Q1
NMOS
EXT
ML9266 LX
R1
C3
FB
GND
RM
R2
+
C2
C1
◆ A proper value of feed forward capacitor parallel with
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
to hundreds KΩ.
For applications without standby or suspend modes,
lower values of R1 and R2 are preferred. For applications
concerning the current consumption in standby or
suspend modes, the higher values of R1and R2 are
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.
● Multi-Output Applications
R1=620K
R2=100
C6=0.1uF
D1
Vin
3.3V/5V
1N5819
L1
3.3--10uH
R3
100
C2
10uF
Vout2
+18V 10mA
C8
1uF
C3
10uF
Q1
NMOS
C1
1uF
C4
10uF
C7
1uF
VDD
CE
EXT
ML9266
LX
GND
FB
C6
R1
Vout1
+9V 100mA
Vout3
-9V 10mA
C5
10uF
R2
P4 / 5
Rev. D, May 2008
ML9266
IPCore
■ Package Dimensions
● SOT-89-5
M1
M2
M6
5
4
M4
1
2
3
M5
M6
M5
M3
M7
F1
Symbol
A
b
B
b1
C
C1
D
D1
e
H
Units: mm
Min
Max
1.400
1.600
0.360
0.520
2.400
2.600
0.406
0.533
-4.250
0.800
-4.400
4.600
-1.700
1.400
1.600
0.380
0.430
Symbol
A
A1
B
b
C
D
e
H
L
Units: mm
Min
Max
0.889
1.295
-0.152
1.397
1.803
0.356
0.559
2.591
2.997
2.692
3.099
0.838
1.041
0.102
0.254
0.356
0.610
H1
H2
H2
● SOT-26
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. D, May 2008