FAN5631(2006) 查看數據表（PDF） - Fairchild Semiconductor
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FAN5631 Datasheet PDF : 11 Pages
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Typical Application
VSEL
1
ON
EN
2
OFF
CB+
3
GND
4
CB-
5
10 NC
9
8 NC
7 NC
6
COUT
10µF
VIN = 2.7V to 5.5V
CIN
10µF
VOUT = 1.2V to 1.5V
Figure 1. Typical Application
90 2:1 Mode
80
70
60
1:1 Mode
50
40
FAN5631
FAN5632 with
optimization
Input Voltage (V)
Average Efficiency (over VIN = 2.7V to 5V) = 66%, With optimization = 77%
Average Efficiency (over VIN = 2.7V to 4.2V) = 67%, With optimization = 84%
Figure 2. Typical Efficiency Graph
Pin Assignment
Top View
VSEL 1
EN 2
CB+ 3
GND 4
CB- 5
10 NC
9 VIN
8 NC
7 NC
6 VOUT
3x3mm 10-Lead MLP
Figure 3. Pin Assignment
Pin Description
Pin No.
1
2
3
4
5
6
7
8
9
10
Pin Name
VSEL
EN
CB+
GND
CB-
VOUT
NC
NC
VIN
NC
Pin Description
Output Voltage Select Logic Input Pin. The VSEL pin can not be left floating and must be
connected to either a logic high or logic low level.
FAN5631: If a logic low is applied to the VSEL pin then VOUT is 1.2V. If a logic high is
applied then VOUT is 1.5V.
FAN5632: If a logic low is applied to the VSEL pin, the efficiency optimization mode is enabled,
and the output voltage accuracy is relaxed in order to meet optimum efficiency. However, if a
logic high is applied, the device will operate like a typical charge pump converter.
Enable Input Pin. If a logic high is applied to the EN pin, the device is enabled. However, if a
logic low is applied, the device is disabled and the supply current is reduced to less than 1µA.
The EN pin can not be left floating and must be connected to either a logic high or logic low level.
Bucket Capacitor Positive Pin.
Ground Pin. This pin is connected to the internal MOSFET switches. This pin must be externally
connected to GND.
Bucket Capacitor Negative Pin.
Output Voltage Pin.
Not Connected. This pin is not internally connected.
Not Connected. This pin is not internally connected.
Supply Voltage Input.
Not Connected. This pin is not internally connected.
2
FAN5631/FAN5632 Rev. 1.0.2
www.fairchildsemi.com
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