參數(shù)資料
型號(hào)： TPS60111PWPR
英文描述： Analog IC
中文描述： 模擬IC
文件頁(yè)數(shù)： 12/22頁(yè)
文件大?。?/td> 421K
代理商： TPS60111PWPR
TPS60100
REGULATED 3.3 V 200-mA LOW-NOISE
CHARGE PUMP DC/DC CONVERTER
SLVS213B – MAY 1999 – REVISED SEPTEMBER 1999
12
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
detailed description
operating principle
The TPS60100 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 200 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 TPS60100 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 TPS60100
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 (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.
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
TPS60100 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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