RT9261-22CB [RICHTEK]
VFM Step-up DC/DC Converter; VFM升压型DC / DC转换器
| 型号： | RT9261-22CB |
| 厂家： | 
RICHTEK TECHNOLOGY CORPORATION |
| 描述： | VFM Step-up DC/DC Converter |
| 文件： | 总14页 (文件大小：219K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Preliminary
RT9261/A
VFM Step-up DC/DC Converter
General Description
Features
The RT9261 Series are VFM Step-up DC/DC ICs
with ultra low supply current by CMOS process and
suitable for use with battery-powered instruments.
z Minimal Number of External Components ( Only
an inductor, a diode, and a capacitor)
z Ultra Low Input Current ( 5µA at Switch Off)
z
2% High Output Voltage Accuracy
The RT9261 IC consists of an oscillator, a VFM
control circuit, a driver transistor (LX switch), a
reference voltage unit, an error amplifier, resistors for
voltage detection, and a LX switch protection circuit.
A low ripple and high efficiency step-up DC/DC
converter can be constructed of this RT9261 IC with
only three external components.
z Low Ripple and Low Noise
z Low Start-up Voltage, 0.85V at 1mA
z 75% Efficiency with Low Cost Inductor
z +50 ppm/°C Low Temperature-Drift
z SOT-89 and SOT-25 Small Packages
Applications
z Power source for battery-powered equipment
z Power source for cameras, camcorders, VCRs,
PDAs, pagers, electronic data banks, and hand-
held communication equipment
The RT9261A IC provides with a drive pin (EXT) for
an external transistor, so that a power transistor can
be externally applied. Therefore, the RT9261A IC is
recommended for applications where large currents
are required. CE pin enables circuit to set the
standby supply current at a maximum of 0.5µA.
z Power source for applications, which require
higher voltage than that of batteries used in the
appliances
Ordering Information
Pin Configurations
RT9261A-ꢀꢀ ꢀ ꢀ
Package type
B : SOT-25
Part Number
Pin Configurations
TOP VIEW
RT9261-ꢀꢀCX
(Plastic SOT-89)
1. GND
X : SOT-89
2. VOUT (TAB)
3. LX
Operating temperature range
C: Commercial standard
1
2
3
TOP VIEW
RT9261A-ꢀꢀCX
(Plastic SOT-89)
Output voltage
15 : 1.5V
16 : 1.6V
:
49 : 4.9V
50 : 5.0V
1. GND
2. VOUT (TAB)
3. EXT
1
5
2
3
4
TOP VIEW
RT9261-ꢀꢀCB
(Plastic SOT-25)
1. CE
2. VOUT
3. NC
A : Use external switch
Use internal switch
4. GND
5. LX
1
2
2
3
TOP VIEW
RT9261A-ꢀꢀCB
(Plastic SOT-25)
5
1
4
3
1. CE
2. VOUT
3. NC
4. GND
5. EXT
DS9261/A-03 January 2002
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1
RT9261/A
Preliminary
Absolute Maximum Ratings
z Output Voltage
z LX Pin Voltage
z EXT Pin Voltage
z CE Pin Voltage
8V
8V
(1)
(2)
-0.3 to V
-0.3 to V
250mA
±50mA
+0.3V
+0.3V
OUT
(3)
OUT
(1)
z LX Pin Output Current
(2)
z EXT Pin Current
z Power Dissipation, P @ T = 25°C
D
A
z SOT-89
0.5W
SOT-25
0.25W
z Package Thermal Resistance
SOT-89, θ
SOT-89, θ
SOT-25, θ
100°C/W
300°C/W
250°C/W
-20 to +85°C
165°C
JC
JA
JA
z Operating Temperature Range
z Storage Temperature Range
z Lead Temperature (Soldering, 10 sec.)
Notes:
260°C
(1) Applicable to RT9261-ꢀꢀCX and RT9261-ꢀꢀCB
(2) Applicable to RT9261A-ꢀꢀCX and RT9261A-ꢀꢀCB
(3) Applicable to RT9261-ꢀꢀCB and RT9261A-ꢀꢀCB
Electrical Characteristics (Refer to Fig. 1)
Parameter
Output Voltage Accuracy
Input Voltage
Symbol
∆V
Test Conditions
Min Typ Max Units
-2
--
--
--
+2
7
%
V
V
V
OUT
V
V
V
IN
Start-up Voltage
--
0.85 1.0
I
I
= 1mA, V : 0 → 2V
IN
ST
OUT
Hold-on Voltage
0.7
--
--
--
= 1mA, V : 2 → 0V
HO
OUT
IN
(1)
15
18
18
24
V
≤ 3.5V
OUT
To be measured at V at
IN
Input Current 1
µA
µA
(2)
(2)
no load
--
3.5V < V
≤ 5V
OUT
To be measured at V
OUT
Input Current 2
--
5
8
in switch off condition
(1)
60
80
--
--
--
--
--
--
V
OUT
≤ 3.5V
LX Switching Current
mA
I
I
V
= 0.4V
= 6V
SWITCHING
LX
3.5V < V
≤ 5V
OUT
LX Leakage Current
Maximum Oscillator
Oscillator Duty Cycle
Efficiency
0.5
µA
KHz
%
V
LEAKAGE
LX
80
65
--
120 160
F
MAX
75
75
85
--
D
On ( V ” L ” ) side
LX
OSC
%
0.65
0.8
1.0
V
V
LX
Voltage Limit
L switch on
X
Notes:
(1) V = 1.8V, VSS = 0V, I
= 10mA, T
= 25°C, and External Circuit of Typical Application
IN
OUT
OPT
(2) V = 3V, VSS = 0V, I
= 10mA, T
= 25°C, and External Circuit of Typical Application
IN
OUT
OPT
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DS9261/A-03 January 2002
2
Preliminary
RT9261/A
Electrical Characteristics (Refer to Fig. 2)
Parameter
Output Voltage Accuracy
Input Voltage
Symbol
∆V
Test Conditions
Min Typ Max Units
-2
--
--
--
--
--
--
+2
7
%
V
OUT
V
V
IN
Start-up Voltage
0.85 1.0
V
I
= 1mA, V : 0 → 2V
IN
ST
OUT
(1)
30
60
50
90
V
≤ 3.5V
OUT
To be measured at V at no
IN
Input Current 1
Input Current 2
µA
µA
(2)
(2)
(2)
(2)
load
3.5V < V
≤ 5V
OUT
(1)
V
OUT
≤ 3.5V
To be measured at V
switch off condition
in
OUT
--
6
10
3.5V < V
≤ 5V
OUT
(1)
-1.5
-2
--
--
--
--
--
--
--
--
V
OUT
≤ 3.5V
EXT “H” Output
Current
mA
mA
V
= V
– 0.4V
EXT
EXT
OUT
3.5V < V
≤ 5V
OUT
(1)
1.5
2
V
OUT
≤ 3.5V
EXT “L” Output
Current
V
= 0.4V
3.5V < V
≤ 5V
OUT
Maximum Oscillator Frequency
Oscillator Duty Cycle
Notes:
80
65
120 160
75 85
KHz
%
F
MAX
D
V
EXT
” H ” side
OSC
(1) Unless otherwise provided, V = 1.8V, VSS = 0V, I
= 10mA, T
= 25°C, and use External Circuit of
OPT
IN
OUT
Typical Application
(2) Unless otherwise provided, V = 3V, VSS = 0V, I
= 10mA, T = 25°C, and External Circuit of Typical
OPT
IN
OUT
Application
DS9261/A-03 January 2002
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RT9261/A
Preliminary
Electrical Characteristics (Refer to Fig. 3)
Parameter
Output Voltage Accuracy
Input Voltage
Symbol
∆V
Test Conditions
Min
-2
--
Typ Max Units
--
--
+2
7
%
V
V
V
OUT
V
V
V
IN
Start-up Voltage
--
0.85
--
1.0
--
I
I
= 1mA, V : 0 → 2V
IN
ST
OUT
Hold-on Voltage
0.7
--
= 1mA, V : 2 → 0V
HO
OUT
IN
(1)
75
85
15
18
5
--
V
≤ 3.5V
OUT
Efficiency
%
µA
µA
mA
(2)
(2)
(2)
(2)
--
--
3.5V < V
≤ 5V
OUT
(1)
--
18
24
8
V
≤ 3.5V
OUT
To be measured at V at
no load
IN
Input Current 1
Input Current 2
--
3.5V < V
≤ 5V
OUT
(1)
--
V
OUT
≤ 3.5V
To be measured at V
in switch off condition
OUT
--
6
10
--
3.5V < V
≤ 5V
OUT
(1)
60
80
--
--
V
≤ 3.5V
OUT
LX Switching
Current
I
I
V
= 0.4V
= 6V
SWITCHING
LX
--
--
3.5V < V
≤ 5V
OUT
LX Leakage Current
CE “H” Level
--
0.5
--
µA
V
V
V
V
LEAKAGE
LX
IN
IN
--
= V
= V
× 0.9
× 0.9
0.4× V
OUT
OUT
OUT
OUT
CE “ L” Level
--
--
--
0.2
0.5
--
V
CE “ H” Input Current
CE “ L“ Input Current
--
µA
µA
KHz
%
CE = V
CE = 0V
-0.5
80
--
Maximum Oscillator Frequency
Oscillator Duty Cycle
120
75
0.8
160
85
1.0
F
MAX
65
D
On (V ” L” ) side
OSC
LX
LX switch on
0.65
V
V
LX
Voltage Limit
Notes:
(1) Unless otherwise provided, V = 1.8V, VSS = 0V, I
= 10mA, T
= 25°C, and use External Circuit of
OPT
IN
OUT
Typical Application
(2) Unless otherwise provided, V = 3V, VSS = 0V, I
= 10mA, T = 25°C, and External Circuit of Typical
OPT
IN
OUT
Application
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DS9261/A-03 January 2002
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Preliminary
RT9261/A
Electrical Characteristics (Refer to Fig. 4)
Parameter
Output Voltage Accuracy
Input Voltage
Symbol
∆V
Test Conditions
Min
-2
--
Typ Max Units
--
--
+2
7
%
V
OUT
V
V
IN
Start-up Voltage
--
0.85
75
85
30
60
1.0
--
V
I
= 1mA, V : 0 → 2V
IN
ST
OUT
(1)
--
V
≤ 3.5V
OUT
Efficiency
%
(2)
(2)
(2)
(2)
(2)
--
--
3.5V < V
≤ 5V
OUT
(1)
--
50
90
V
OUT
≤ 3.5V
To be measured at V at
no load
IN
Input Current 1
Input Current 2
µA
µA
mA
mA
--
3.5V < V
≤ 5V
OUT
(1)
V
OUT
≤ 3.5V
To be measured at V
switch off condition
in
OUT
--
6
10
3.5V < V
≤ 5V
OUT
(1)
-1.5
-2
--
--
--
--
V
OUT
≤ 3.5V
EXT “H” Output
Current
V
= V
– 0.4V
EXT
EXT
OUT
3.5V < V
≤ 5V
OUT
(1)
1.5
2
--
--
V
OUT
≤ 3.5V
EXT “L” Output
Current
V
= 0.4V
--
--
3.5V < V
≤ 5V
OUT
CE “H” Level
CE “ L” Level
--
--
V
V
V
V
= V
× 0.9
0.4× V
OUT
IN
OUT
OUT
OUT
--
--
--
0.2
0.5
--
= V
× 0.9
IN
CE “ H” Input Current
CE “ L“ Input Current
--
µA
µA
KHz
%
CE = V
CE = 0V
-0.5
80
--
Maximum Oscillator Frequency
Oscillator Duty Cycle
120
75
0.8
160
85
1.0
F
MAX
65
D
On (V ” L” ) side
LX switch on
OSC
LX
0.65
V
V
LX
Voltage Limit
Notes:
(1) Unless otherwise provided, V = 1.8V, VSS = 0V, I
= 10mA, T
= 25°C, and use External Circuit of
OPT
IN
OUT
Typical Application
(2) Unless otherwise provided, V = 3V, VSS = 0V, I
= 10mA, T = 25°C, and External Circuit of Typical
OPT
IN
OUT
Application
DS9261/A-03 January 2002
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RT9261/A
Function Block Diagram
Preliminary
VLX Limiter
LX
Vref
LXSW
VOUT
Buffer
GND
EXT
_
+
VFM Control
Error Amp.
OSC 100kHz
Chip Enable
CE
Notes:
(1) LX Pin .……
(2) EXT Pin ……
(3) CE Pin ……
only for 9261-ꢀꢀCX and 9261-ꢀꢀCB
only for 9261A-ꢀꢀCX and 9261A-ꢀꢀCB
only for 9261-ꢀꢀCB and 9261A-ꢀꢀCB
Pin Description
Pin No.
Pin Name
Pin Function
-xxCX A-xxCX -xxCB A-xxCB
1
2
1
2
4
2
5
--
1
3
4
2
--
5
1
3
GND
VOUT
LX
Ground
Output Voltage
3
--
3
Pin for Switching
Drive External Device
Chip Enable (Active High)
No Connected
--
--
--
EXT
CE
--
--
NC
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DS9261/A-03 January 2002
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Preliminary
RT9261/A
Typical Application Circuit
D1
1N5819
L1
RT9261CX
VOUT
LX
VOUT
100µH
GND
+
_
Co
22µF
VIN
Fig. 1
L1
D1
27µH
0.01 F
1N5819
µ
Cb
RT9261ACX
VOUT
EXT
VOUT
GND
+
_
VIN ZTX
650
Co
22 F
µ
Rb
300Ω
Tr
Fig. 2
D1
L1
1N5819
RT9261CB
LX
VOUT
100 H
µ
NC
EXT
VOUT
GND
+
_
CE
Co
22 F
VIN
µ
Fig. 3
DS9261/A-03 January 2002
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RT9261/A
Preliminary
L1
D1
27µH
1N5819
RT9261ACB
NC
0.01 F
µ
LX
Cb
EXT
CE
VOUT
GND
VOUT
VIN
ZTX
650
+
_
Co
22 F
Rb
µ
Tr
300
Ω
Fig. 4
D1
L1
1N5819
RT9261CB
LX
VOUT
27 H
µ
NC
CE
EXT
VOUT
GND
+
_
CE
Co
22µF
VIN
Fig. 5
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DS9261/A-03 January 2002
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Preliminary
RT9261/A
Typical Operating Charateristics
RT9261(2.7V)
RT9261(2.7V)
Start-up/Hold-on Voltage vs. Output Current
Output Current vs. Ripple Voltage
1.4
120
100
80
60
40
20
0
1.2
Vstart
1.0
2.0V
0.8
Vhold
2.5V
0.6
0.4
1.5V
0.9V
0.2
0.0
RT9261
OUT
RT9261
OUT
V
= 2.7V
V
= 2.7V
0
0
0
10
20
30
40
50
0
20
40
60
80
100
Output Current (mA)
Output Current (mA)
RT9261(2.7V)
Output Voltage vs. Temperature
Output Voltage vs. Output Current
2.90
3.0
2.5
2.0
1.5
1.0
0.5
0.0
2.5V
2.0V
1.0V
1.5V
2.85
2.80
2.75
2.70
2.65
2.60
0.9V
RT9261
RT9261
= 2.7V
V
= 2.7V
V
OUT
OUT
-40
-20
0
20
40
60
80
20
40
60
80
100
Temperature ( C)
Output Current (mA)
°
RT9261(2.7V)
Supply Current vs. Temperature
Efficiency vs. Output Current
70
90
80
70
60
50
40
30
20
10
0
RT9261
V
= 2.7V
OUT
60
50
40
30
20
10
0
2.0V
2.5V
1.5V
0.9V
1.0V
Input Current 2
RT9261
Input Current 1
V
= 2.7V
OUT
20
40
60
80
100
-40
-20
0
20
40
60
80
Output Current (mA)
Temperature ( C)
°
DS9261/A-03 January 2002
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RT9261/A
Preliminary
RT9261A (2.7V)
Maximum Oscillator Frequency vs. Temp.
Output Voltage vs. Output Current
3.0
160
140
120
100
80
2.5V
2.0V
1.5V
2.5
2.0
1.5
1.0
0.5
0.0
1.0V
0.9V
60
40
RT9261A
= 2.7V
RT9261
= 2.7V
20
V
OUT
V
OUT
0
0
30
60
90
120
150
-40
-20
0
20
40
60
80
Output Current (mA)
°
Temperature ( C)
RT9261A (2.7V)
Oscillator Duty Cycle vs. Temperatrue
Efficiency vs. Output Current
100
90
80
70
60
50
80
2.5V
2.0V
70
60
50
40
30
20
10
0
0.9V
1.5V
1.0V
RT9261A
= 2.7V
RT9261
OUT
V
V
= 2.7V
OUT
0
30
60
90
120
150
-40
-20
0
20
40
60
80
°
Output Current (mA)
Temperature ( C)
RT9261A (2.7V)
Start-up/Hold-on Voltage vs. Output Current
Output Current vs. Ripple Voltage
1.6
120
100
80
60
40
20
0
1.4
1.2
2.5V
2.0V
1.5V
Vstart
1.0
0.8
Vhold
0.6
0.4
0.9V
RT9261A
RT9261A
= 2.7V
0.2
0.0
V
OUT
V
= 2.7V
OUT
0
30
60
90
120
150
0
30
60
90
120
150
Output Current (mA)
Output Current (mA)
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DS9261/A-03 January 2002
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Preliminary
RT9261/A
Package Information
D
A
D1
H
B
C
C1
e
e
A
b
b1
b
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
1.397
0.356
2.388
0.406
--
Max
Min
0.055
0.014
0.094
0.016
--
Max
A
b
1.600
0.483
2.591
0.533
4.242
1.194
4.597
1.753
1.549
0.432
0.063
0.019
0.102
0.021
0.167
0.047
0.181
0.069
0.061
0.017
B
b1
C
C1
D
0.787
4.394
1.397
1.448
0.355
0.031
0.173
0.055
0.057
0.014
D1
e
H
3-Lead SOT-89 Surface Mount
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11
RT9261/A
Preliminary
D
5
1
4
3
C
B
b
H
A
L
e
A1
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
Max
Min
Max
A
A1
B
0.889
0.000
1.397
0.356
2.591
2.692
0.838
0.102
0.356
1.295
0.152
1.803
0.559
2.997
3.099
1.041
0.254
0.610
0.035
0.000
0.055
0.014
0.102
0.106
0.033
0.004
0.014
0.051
0.006
0.071
0.022
0.118
0.122
0.041
0.010
0.024
b
C
D
e
H
L
SOT- 25 Surface Mount Package
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DS9261/A-03 January 2002
12
Preliminary
RT9261/A
DS9261/A-03 January 2002
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13
RT9261/A
Preliminary
RICHTEK TECHNOLOGY CORP.
Headquarter
RICHTEK TECHNOLOGY CORP.
Taipei Office (Marketing)
6F, No. 35, Hsintai Road, Chupei City
8F-1, No. 137, Lane 235, Paochiao Road, Hsintien City
Hsinchu, Taiwan, R.O.C.
Taipei County, Taiwan, R.O.C.
Tel: (8863)5510047 Fax: (8863)5537749
Tel: (8862)89191466 Fax: (8862)89191465
Email: marketing@richtek-ic.com.tw
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DS9261/A-03 January 2002
14
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