RT9216B RichTek, RT9216B Datasheet

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RT9216B

Manufacturer Part Number
RT9216B
Description
VFM STEP UP DC/DC CONVERTER
Manufacturer
RichTek
Datasheet
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-
DS9261B-03 September 2001
Operating temperature range
Package type
B : SOT-25
X : SOT-89
C: Commercial standard
Output voltage
15 : 1.5V
16 : 1.6V
49 : 4.9V
50 : 5.0V
:
Preliminary
VFM Step-up DC/DC Converter
Features
Applications
Pin Configurations
Part Number
RT9261B-
(Plastic SOT-89)
RT9261B-
(Plastic SOT-25)
Power source for battery-powered equipment
Power source for cameras, camcorders, VCRs,
Power source for appliances, which require
Minimal Number of External Components
(Only an Inductor, a Diode, and a Capacitor)
Ultra Low Input Current (6.5µ µ µ µ A at Switch Off)
Capable of Supplying 50mA Output Current
with Internal Switch
± ± ± ± 2% Output Voltage Accuracy
Low Ripple and Low Noise
Low Start-up Voltage, 0.8V at 1mA
80% Efficiency with Low Cost Inductor
+50 ppm/° ° ° ° C Low Temperature-Drift
SOT-89 and SOT-25 Small Packages
PDAs, pagers, electronic data banks, and hand-
held communication equipment
higher voltage than that of batteries used in the
appliances
CX
CB
5
1
1
Pin Configurations
2
2
3
4
3
www.richtek-ic.com.tw
RT9261B
1. GND
2. VOUT (TAB)
3. LX
1. CE
2. VOUT
3. NC
4. GND
5.
TOP VIEW
TOP VIEW
LX
1

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RT9216B Summary of contents

Page 1

... 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) RT9261B- CB (Plastic SOT-25) RT9261B Pin Configurations TOP VIEW 1. GND 2. VOUT (TAB TOP VIEW VOUT GND www.richtek-ic.com.tw 1 ...

Page 2

... L1 ranges from 27µH to 120µH Pin Description Pin No. Pin Name -xxCX -xxCB 1 4 GND 2 2 VOUT Function Block Diagram LX GND www.richtek-ic.com.tw 2 Preliminary D1 1N5819 L1 RT9261B LX VOUT 27 µ H GND IN D1 1N5819 L1 RT9261B LX 27 µ H VOUT CE GND Ground Output Voltage Pin for Switching ...

Page 3

... LX -- 0.65 RT9261B +0.3V OUT 400mA 0.5W 0.25W 100°C/W 300°C/W 250°C/W -20 to +85°C -65°C to 150°C 260°C Typ Max Units -- + 0 µ 6.5 10 µ µ 0.5 µA 190 240 KHz 0.8 1.0 V www.richtek-ic.com.tw 3 ...

Page 4

... Maximum Oscillator Frequency Oscillator Duty Cycle V Voltage Limit LX Notes: ( 1.8V 0V OUT ( 3V 0V 1mA, Topt = 25°C, and External Circuit of Typical Application IN SS OUT www.richtek-ic.com.tw 4 Preliminary (Refer to Fig. 2) Symbol Test Conditions ∆V OUT OUT OUT (1) ...

Page 5

... OUT L = 47uH 150 200 RT9261B Output Voltage vs. Output Current 1.5V 1. 100 Output Current (mA) Output Current vs. Ripple Voltage 1.5V 1. 100 Output Current (mA) Efficiency vs. output Current 1.0V 1. 100 Output Current (mA) www.richtek-ic.com.tw 3.0V 2.5V 2. 3.3V OUT L = 47uH 150 200 3.0V 2.0V 2. 3.3V OUT C = 68uF OUT L = 47uH 150 200 3.0V 2.5V 2. 3.3V OUT ...

Page 6

... Output Current vs. Ripple Voltage 300 250 200 150 100 50 1.5V 1. 100 Output Current (mA) Output Current vs. Ripple Voltage 18 2. 100 Output Current (mA) www.richtek-ic.com.tw 6 Preliminary 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0 3.3V OUT L = 100uH 0.0 80 100 120 2.0V 3.0V 2. 3.3V OUT C = 20uF OUT L = 100uH 150 200 100 3. ...

Page 7

... SOT-89 Surface Mount RT9261B A H Dimensions In Inches Min Max 0.055 0.063 0.014 0.019 0.094 0.102 0.016 0.021 -- 0.167 0.031 0.047 0.173 0.181 0.055 0.069 0.057 0.061 0.015 0.017 www.richtek-ic.com.tw 7 ...

Page 8

... RT9261B C A Symbol www.richtek-ic.com.tw 8 Preliminary Dimensions In Millimeters Min Max 0.889 1.295 0.000 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 SOT- 25 Surface Mount Package H L Dimensions In Inches ...

Page 9

... DS9261B-03 September 2001 Preliminary RT9261B www.richtek-ic.com.tw 9 ...

Page 10

... Headquarter 6F, No. 35, Hsintai Road, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5510047 Fax: (8863)5537749 www.richtek-ic.com.tw 10 Preliminary RICHTEK TECHNOLOGY CORP. Taipei Office (Marketing) 8F-1, No. 137, Lane 235, Paochiao Road, Hsintien City Taipei County, Taiwan, R.O.C. Tel: (8862)89191466 Fax: (8862)89191465 Email: marketing@richtek-ic.com.tw DS9261B-03 September 2001 ...

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