RT9267GC Просмотр технического описания (PDF) - Richtek Technology
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RT9267GC Datasheet PDF : 9 Pages
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RT9267
Preliminary
Typical Application Circuit
VIN (1.1V to 3.3V)
2.5V
C2
10uF
C1
1uF
Chip Enable 2
4
12
R1
1.3M
R2
680k
C3
100pF
14
10
16
VDD
1
CE1
LX1
CE2
LDOO
15
FB1
RT9267
LFB
LBI
R3
R4
Low Battery
Warning Output
(Poen Collector)
9 LBO
5
NC
7 NC
13
NC
6
LX2
11
FB2
GND GND
8
3
R5
1.6M
R6
980k
L1
4.7uH
D1
C4
1N5819 C6
C7
100pF
100uF 1uF
L2
10uH
D2
1N5819 C8
C9
100uF 1uF
Q1
N MOS
R7
1.5M
C5
0.1uF
R8
112k
C10
100uF
3.3V
18V
Functional Pin Description
Pin No. Pin Name
1 LX1
2 EN1
3 GND
4 EN2
5 NC
6 LX2
7 NC
8 GND
9 LBO
10 LBI
11 FB2
12 LDOO
13 NC
14 LFB
15 FB1
16 VDD
Pin Function
The Switching Pin for 1st PWM Converter
Enable Pin for 1st PWM Converter and LDO. (Active High)
Ground (Both Pin3 and Pin8 should be connected)
Enable Pin for 2nd PWM Converter and Voltage Detector. (Active High)
Not Connected
The Switching Pin for 2nd PWM Converter
Not Connected
Ground (Both Pin3 and Pin8 should be connected)
NMOS Open Drain Output of the Voltage Detector. This pin will internally pulled low when
the voltage at LBI pin below 0.86V.
Input Pin for Voltage Detector. The trip point is 0.86V.
Feedback Input Pin for 2nd PWM Converter. Internal VREF for the error amplifier is 1.25V.
Voltage Output Pin for the LDO.
Not Connected
Feedback Pin for the LDO. Internal VREF for the error amplifier is 0.86V
Feedback Input Pin for 1st PWM Converter. Internal VREF for the error amplifier is 1.25V
Input Positive Power Pin of RT9267, and also the Voltage Input Pin for LDO.
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2
DS9267-08 March 2007
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