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PDF RT9261B Data sheet ( Hoja de datos )
| Número de pieza | RT9261B | |
| Descripción | VFM Step-up DC/DC Converter | |
| Fabricantes | RICHTEK | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT9261B (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
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Preliminary
RT9261B
VFM Step-up DC/DC Converter
General Description
The RT9261B Series are VFM Step-up DC/DC
converter ICs with ultra low supply current by CMOS
process and suitable for use with battery-powered
instruments.
The RT9261B 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 with the
RT9261B IC and only three external components.
The CE pin enables the circuit to set the standby
supply current at a maximum of 0.5µA.
Ordering Information
RT9261B-
Package type
B : SOT-25
X : SOT-89
Operating temperature range
C: Commercial standard
Output voltage
15 : 1.5V
16 : 1.6V
:
49 : 4.9V
50 : 5.0V
Features
z Minimal Number of External Components
(Only an Inductor, a Diode, and a Capacitor)
z Ultra Low Input Current (6.5µA at Switch Off)
z Capable of Supplying 50mA Output Current
with Internal Switch
z ±2% Output Voltage Accuracy
z Low Ripple and Low Noise
z Low Start-up Voltage, 0.8V at 1mA
z 80% 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
z Power source for appliances, which require
higher voltage than that of batteries used in the
appliances
Pin Configurations
Part Number
RT9261B-
CX
(Plastic SOT-89)
Pin Configurations
TOP VIEW
1 23
1. GND
2. VOUT (TAB)
3. LX
RT9261B-
CB
(Plastic SOT-25)
54
123
TOP VIEW
1. CE
2. VOUT
3. NC
4. GND
5. LX
DS9261B-03 September 2001
www.richtek-ic.com.tw
1
1 page  
Preliminary
Typical Operating Charateristics
RT9261B
Start-up/Hold-on Voltage vs. Output Current
2.5
2
1.5
1 Vstart
Vhold
0.5
0
0 30
VOUT = 3.3V
L = 47uH
60 90 120 150 180
Output Current (mA)
Output Current vs. Ripple Voltage
300
2.5V
250 2.0V
3.0V
200
150
100 1.5V
50
0
0
1.0V
VOUT = 3.3V
COUT = 20uF
L = 47uH
50 100 150
Output Current (mA)
200
Output Current vs. Ripple Voltage
25
20
2.5V
15 3.0V
10 1.0V
5 VOUT = 3.3V
2.0V
0 1.5V
COUT = 170uF
L = 47uH
0 50 100 150 200
Output Current (mA)
Output Voltage vs. Output Current
4.0
3.5 3.0V
2.5V
3.0
1.0V
1.5V
2.0V
2.5
2.0
1.5
1.0
0.5
0.0
0
VOUT = 3.3V
L = 47uH
50 100 150
Output Current (mA)
200
Output Current vs. Ripple Voltage
90
3.0V
80 2.0V
70
60 2.5V
50
40
30
20
10
0
0
1.0V
1.5V
VOUT = 3.3V
COUT = 68uF
L = 47uH
50 100 150
Output Current (mA)
200
Efficiency vs. output Current
90
3.0V
80 2.5V
70 1.0V
2.0V
60 1.5V
50
40
30
20
10
0
0
VOUT = 3.3V
L = 47uH
50 100 150
Output Current (mA)
200
DS9261B-03 September 2001
www.richtek-ic.com.tw
5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet RT9261B.PDF ] | |
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