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TPS60110 View Datasheet(PDF) - Texas Instruments

Part NameDescriptionManufacturer
TPS60110 REGULATED 5-V 300-mA LOW-NOISE CHARGE PUMP DC/DC CONVERTER TI
Texas Instruments TI
TPS60110 Datasheet PDF : 26 Pages
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TPS60110
REGULATED 5ĆV 300ĆmA LOWĆNOISE
CHARGE PUMP DC/DC CONVERTER
SLVS215C − JUNE 1999 − REVISED AUGUST 2008
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 specifies 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
TPS60110 in push-pull mode is shown in Figure 1 and Figure 24.
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.
INPUT
2.7 V to 5.4 V
CIN +
15 µF
OFF/ON
SKIP COM CLK
IN
OUT
IN
OUT
TPS60110 FB
C1+
C2+
C1−
C2−
ENABLE SYNC
PGND GND
OUTPUT
5 V 300 mA
+
CO = 33 µF
CF = 4.7 µF
Figure 25. Typical Operating Circuit TPS60110 in Single-Ended Operating Mode
Output ripple amplitude
Smallest board space
Table 2. Tradeoffs Between Operating Modes
FEATURE
PUSH-PULL MODE
(COM = Low)
Small amplitude
SINGLE-ENDED MODE
(COM = High)
Large amplitude
X
12
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
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