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參數(shù)資料
| 型號： | TPS601A-C |
| 英文描述： | PHOTOTRANSISTOR | NPN | 800NM PEAK WAVELENGTH | 50M | CAN-4.6 |
| 中文描述： | 光電晶體管|叩| 800NM峰值波長|五十米|的CAN - 4.6 |
| 文件頁數(shù)： | 14/22頁 |
| 文件大?。?/td> | 421K |
| 代理商： | TPS601A-C |
TPS60100
REGULATED 3.3 V 200-mA LOW-NOISE
CHARGE PUMP DC/DC CONVERTER
SLVS213B – MAY 1999 – REVISED SEPTEMBER 1999
14
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
detailed description (continued)
push-pull operating mode
In push-pull operating mode (COM = low), the two single-ended charge pumps operate with 180
°
phase shift.
The oscillator signal has a 50% duty cycle. Each single-ended charge pump transfers charge into its transfer
capacitor (C
xF
) in one-half of the period. During the other half of the period (transfer phase), C
xF
is placed in
series with the input to transfer its charge to C
O
. While one single-ended charge pump is in the charge phase,
the other one is in the transfer phase. This operation guarantees an almost constant output current which
ensures a low output ripple. COM is a logic input and should not remain floating. The typical operating circuit
of the TPS60100 in push-pull mode is shown in Figure 1 and Figure 30.
single-ended operating mode
When COM is high, the device runs in single-ended operating mode. The two single-ended charge pumps
operate in parallel without phase shift. They transfer charge into the transfer capacitor (C
F
) in one half of the
period. During the other half of the period (transfer phase), C
F
is placed in series with the input to transfer its
charge to C
O
. In single-ended operating mode only one transfer capacitor (C
F
= C
1F
+ C
2F
) is required, resulting
in less board space.
IN
IN
C1+
C1–
ENABLE
PGND GND
OUT
OUT
FB
C2+
C2–
SYNC
SKIP COM 3V8
INPUT
1.8 V to 3.6 V
CIN
10
μ
F
OUTPUT
3.3 V 200 mA
CO = 22
μ
F
CF = 4.7
μ
F
+
OFF/ON
TPS60100
+
Figure 31. Typical Operating Circuit TPS60100 in Single-Ended Operating Mode
Table 2. Tradeoffs Between Operating Modes
FEATURE
PUSH-PULL MODE
(COM = Low)
SINGLE-ENDED MODE
(COM = High)
Output ripple amplitude
Small amplitude
Large amplitude
Smallest board space
X
regulated 3.3 V operating mode
In regulated 3.3 V operating mode (3V8 = low) the device provides a regulated 3.3-V output from a1.8-V to 3.6-V
input. 3V8 is a logic input and should not remain floating. The typical operating circuit of the TPS60100 in (3.3
V) regulated mode is shown in Figure 1 and Figure 30.
pre-regulated 3.8 V operating mode
When 3V8 is high, the device provides a preregulated 3.8-V output from a 2.2-V to 3.6-V input. This mode should
be used if a tighter output voltage tolerance is a major concern. In this case the charge pump generates the input
voltage for a low-dropout regulator.
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