参数资料
型号: AS1310-BTDT-25
厂商: ams
文件页数: 10/20页
文件大小: 0K
描述: IC REG BOOST 2.5V 60MA 8TDFN
标准包装: 1
类型: 升压(升压)
输出类型: 固定
输出数: 1
输出电压: 2.5V
输入电压: 0.7 V ~ 3.6 V
电流 - 输出: 60mA
同步整流器:
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 8-UFDFN 裸露焊盘
包装: 标准包装
供应商设备封装: 8-TDFN(2x2)
其它名称: AS1310-BTDT-25DKR
AS1310
Datasheet - D e t a i l e d D e s c r i p t i o n
Figure 13. Simplified Voltage and Current Waveforms
V
0.99V OUT_NOM
V OUT
V OUT Ripple
V IND_TOFF
V IN
B
B
V IND_TON
C
D
A
C
D
0
T
T OFF
T WAIT
T ON
T OFF
T WAIT
I L
SW1_on
SW2_off
I PK
0
T
T
SW2_on
SW1_off
T
Another important relationship is the “volt-seconds” law. Expressed as following:
V ON T ON = V OFF T OFF
(EQ 4)
Voltages are those measured across the inductor during each time segment. Figure 13 shows this graphically with the shaded segments marked
“A & B”. Re-arranging (EQ 4) :
T ON V OUT – V IN
------------- = ----------------------------
T OFF V IN
(EQ 5)
The time segment called T WAIT in Figure 13 is a measure of the “hold-up” time of the output capacitor. While the output voltage is above the
threshold (0.99xV OUT ), the output is assumed to be in regulation and no further switching occurs.
8.1.2
Inductor Choice Example
For the AS1310 V IN_MIN = 0.9V, V OUT_MAX = 3.3V, (EQ 5) gives Ton=2.66T OFF .
Let the maximum operating on-time = 1μs.
Note that this is shorter than the minimum limit on-time of 3.6μs. Therefore from (EQ 5) , T OFF = 0.376μs. Using (EQ 3) , L MAX is obtained:
L MAX = 1.875μH. The nearest preferred value is 2.2μH.
This value provides the maximum energy storage for the chosen fixed on-time limit at the minimum V IN .
www.austriamicrosystems.com/DC-DC_Step-Up/AS1310
Revision 1.8
9 - 19
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