TPS60310 datasheet(16/20 Pages) TI

16 / 20 page

TPS60310, TPS60311, TPS60312, TPS60313

SINGLE-CELL TO 3-V/3.3-V, 20-mA DUAL OUTPUT,

HIGH-EFFICIENCY CHARGE PUMP WITH SNOOZE MODE

SLVS362A – MAY 2001 – REVISED AUGUST 2001

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

APPLICATION INFORMATION

output filter design (continued)

Due to R(PG,1), an output filter can easily be formed with an output capacitor (CPG). Cutoff frequency is given

by:

ƒc +

(PG,1)

(1)

(PG,1)

O(OUT2)

) 2pƒR

(PG,1)

and ratio VO/VI for the ac ripple is:

(2)

with R(PG,1) = 15 Ω, CPG = 0.1 µF, and f = 600 kHz (at nominal switching frequency)

(PG,1)

O(OUT2)

+ 0.175

(3)

Load current sourced by power-good output reduces maximum output current at OUT2. During start-up

(power-good going high) current charging CPG discharges C(OUT2). Therefore, CPG must not be larger than CPG

≤ 0.1 C(OUT2) or the device does not start. By charging CPG through C(OUT2), the output voltage at OUT2

decreases. If the capacitance of CPG is to large, the circuit detects power bad. The power-good output goes low

and discharges CPG. Then the cycle starts again. Figure 24 shows a configuration with an LC-post filter to further

reduce output ripple and noise.

OUT1

C(OUT1)

µF

OUT2

C(OUT2)

µF

VIN

CIN

µF

INPUT

0.9 V to 1.8 V

SNOOZE

ON/OFF

GND

TPS60310

C2F

µF

C2+

C2–

C1+

C1–

C1F

µF

VP(OUT)

Figure 24. LC-Post Filter

Table 4. Recommended Values for Lowest Output Voltage Ripple

VIN

IO(OUT2)

CIN[µF]

CXF[µF]

COUT[µF]

L[ H]

CP[µF]

VP(OUT)

VIN

[V]

IO(OUT2)

[mA]

CIN[µF]

CERAMIC

CXF[µF]

CERAMIC

COUT[µF]

CERAMIC

LP[µH]

CP[µF]

CERAMIC

VP(OUT)

VP–P[mV]

0.9

…1.8

0.1

0.1 (X7R)

0.9

…1.8

0.1

1 // 0.1 (X7R)

0.9

…1.8

0.1 (X7R)

0.9

…1.8

1 // 0.1 (X7R)

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