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| 型号： | TPS60101PWPRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 0.1 A SWITCHED CAPACITOR REGULATOR, 400 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封装： | GREEN, PLASTIC, HTSSOP-20 |
| 文件页数： | 6/26页 |
| 文件大小： | 840K |
| 代理商： | TPS60101PWPRG4 |
TPS60101
REGULATED 3.3V 100mA LOW NOISE
CHARGE PUMP DC/DC CONVERTER
SLVS214A JUNE 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 (CxF) in one-half of the period. During the other half of the period (transfer phase), CxF is placed in
series with the input to transfer its charge to CO. 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 TPS60101 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 (CF) in one half of the
period. During the other half of the period (transfer phase), CF is placed in series with the input to transfer its
charge to CO. In single-ended operating mode only one transfer capacitor (CF = C1F + C2F) is required, resulting
in less board space.
IN
C1+
C1
ENABLE
OUT
FB
C2+
C2
SYNC
SKIP COM 3V8
PGND GND
INPUT
1.8 V to 3.6 V
CIN
4.7
F
OUTPUT
3.3 V 100 mA
CO = 10 F
CF = 2.2 F
+
OFF/ON
TPS60101
+
Figure 31. Typical Operating Circuit TPS60101 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 TPS60101 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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