TPS51640A, TPS59640, TPS59641
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SLUSAQ2 –JANUARY 2012
ELECTRICAL CHARACTERISTICS (continued)
over recommended free-air temperature range, VV5 = VV5DRV = 5.0 V; VV3R3 = 3.3 V; VxGFB = VPGND = VGND, VxVFB = VCORE
(Unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
CURRENT SENSE: OVERCURRENT, ZERO CROSSING, VOLTAGE POSITIONING AND PHASE BALANCING
TPS51640A
5.1
4.6
7.0
7.0
9.7
9.7
RxOCP-I = 20 kΩ
RxOCP-I = 24 kΩ
RxOCP-I = 30 kΩ
RxOCP-I = 39 kΩ
RxOCP-I = 56 kΩ
RxOCP-I = 75 kΩ
RxOCP-I = 100 kΩ
RxOCP-I = 150 kΩ
TPS59640
TPS59641
TPS51640A
8.1
10.0
10.0
14.0
14.0
19.0
19.0
25.0
25.0
32.0
32.0
40.0
40.0
49.0
49.0
12.6
13.1
16.7
17.2
21.7
22.2
27.9
28.4
35.0
35.5
43.3
43.8
52.6
53.1
TPS59640
TPS59641
7.6
TPS51640A
12.1
11.6
17.1
16.6
23.1
22.6
29.7
29.2
37.9
37.4
46.8
46.2
TPS59640
TPS59641
TPS51640A
TPS59640
TPS59641
OCP voltage (valley current
limit)
VOCPP
mV
TPS51640A
TPS59640
TPS59641
TPS51640A
TPS59640
TPS59641
TPS51640A
TPS59640
TPS59641
TPS51640A
TPS59640
TPS59641
VIMAX_MIN = 133 mV, value of xIMAX,
VIMAX = VREF × IMAX / 255
20
A
VIMAX
IMAX values both channels
CS pin input bias current
VIMAX_MAX = 653mV, value of xIMAX
CSPx and CSNx
98
A
ICS
–1.0
90
0.2
1.0
180
518
518
µA
xVFB input bias current,
discharge
IxVFBDQ
End of soft-stop, xVFB = 100mV
125
497
497
µA
TPS51640A
486
480
Droop amplifier
transconductance
GM-DROOP
xVFB = 1 V
µS
TPS59640
TPS59641
(VCSP1 – VCSN1) = (VCSP2 – VCSN2) =
(VCSP3 – VCSN3) = VOCPP_MIN
IBAL_TOL
ACSINT
Internal current share tolerance
Internal current sense gain
–3%
+3%
Gain from CSPx – CSNx to PWM comparator
11.65
12.00
12.30
V/V
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