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參數(shù)資料
| 型號(hào)： | TPS60101PWPRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.1 A SWITCHED CAPACITOR REGULATOR, 400 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | GREEN, PLASTIC, HTSSOP-20 |
| 文件頁數(shù)： | 4/26頁 |
| 文件大小： | 840K |
| 代理商： | TPS60101PWPRG4 |
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TPS60101
REGULATED 3.3V 100mA LOW NOISE
CHARGE PUMP DC/DC CONVERTER
SLVS214A JUNE 1999 REVISED SEPTEMBER 1999
12
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
detailed description
operating principle
The TPS60101 charge pump provides a regulated 3.3-V output from a 1.8-V to 3.6-V input. It delivers a
maximum load current of 100 mA. Designed specifically for space critical battery powered applications, the
complete charge pump circuit requires only four external capacitors. The circuit can be optimized for highest
efficiency at light loads or lowest output noise. The TPS60101 consists of an oscillator, a 1.22-V bandgap
reference, an internal resistive feedback circuit, an error amplifier, high current MOSFET switches, a
shutdown/start-up circuit, and a control circuit (Figure 29)
C1+
C1
ENABLE
OUT
FB
0
°
180
°
PGND
C1F
IN
CHARGE PUMP 2
C2+
C2
OUT
PGND
C2F
IN
T22
T21
OSCILLATOR
GND
SKIP
COM
3V8
VREF +
+
CONTROL
CIRCUIT
0.8
× VIN
+
+
SHUTDOWN/
START-UP
CONTROL
SYNC
T11
T12
T13
T14
T24
T23
CHARGE PUMP 1
Figure 29. Functional Block Diagram TPS60101
The oscillator runs at a 50% duty cycle. The device consists of two single-ended charge pumps which operate
with 180
° phase shift. 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.
If the clock were to run continuously, this process would eventually generate an output voltage equal to two times
the input voltage (hence the name doubler). In order to provide a regulated fixed output voltage of 3.3 V, the
TPS60101 uses either pulse-skip mode or constant-frequency mode. Pulse-skip mode and constant-frequency
mode are externally selected via the SKIP input pin.
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