Datasheet

ELECTRICAL CHARACTERISTICS – SWITCHED MODE SM1 STEP-DOWN CONVERTER
TPS65820
www.ti.com .............................................................................................................................................................. SLVS663B – MAY 2006 – REVISED APRIL 2008
Over recommended operating conditions (typical values at T
J
= 25 ° C), V
O(SM1)
= 1.24 V, application circuit as in Figure 3
(unless otherwise noted).
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
I
Q(SM1)
= I(VIN_ SM1), no output load Not switching 10
I
Q(SM1)
Quiescent current for SM1 µ A
SM1 OFF, set via I
2
C 0.1
I
O(SM1)
Output current range 600 mA
Available output
voltages: V
O(SM1)TYP
=
Output voltage, selectable via I
2
C, standby OFF 0.6 V to 1.8 V,
adjustable in 40 mV
steps
V
Available output
voltages: V
SBY(SM1)
=
V
O(SM1)
= V
SBY(SM1)
, output voltage range, standby ON 0.6 V to 1.8 V,
V
O(SM1)
Output voltage, PWM mode
adjustable in 40 mV
steps
Total accuracy, V
O(SM1)TYP
= V
SBY(SM1)
= 1.24 V,
– 3% 3%
V(VIN_SM1) = 3 V to 4.7 V; 0 mA ≤ I
O(SM1)
≤ 600 mA
Line regulation, V(VIN_SM1): 3 V → 4.7 V,
0.027 %/V
I
O(SM1)
= 10 mA
Load regulation, V(VIN_SM1) = 4.7 V,
0.139 %/A
I
O(SM1)
: 60 mA → 540 mA
P-channel MOSFET
R
DSON(PSM1)
V(VIN_SM1) = 3.6 V, 100% duty cycle set 310 500 m Ω
on-resistance
I
LKG(PSM1)
P-channel leakage current 0.1 µ A
N-channel MOSFET
R
DSON(NSM1)
V(VIN_SM1) = 3.6 V, 0% duty cycle set 220 330 m Ω
on-resistance
I
LKG(PSM1)
N-channel leakage current 5 µ A
I
LIM(SM1)
P- and N-channel current limit 3 V < V(VIN_SM1) < 4.7 V 900 1050 1200 mA
f
S(SM1)
Oscillator frequency PWM mode set 1.3 1.5 1.7 MHz
V(VIN_SM1) = 4.2 V, PWM mode, I
O(SM1)
= 300 mA,
EFF
(SM1)
Efficiency 90%
V
O(SM1)
= 3 V
Converter OFF → ON, V
O(SM1)
: 5% → 95% of target
t
SS(SM1)
Soft start ramp time 750 µ s
value
t
DLY(SM1)
GPIO1 pin programmed as SM1 converter enable
Converter turn-on delay 170 µ s
control. Measured from V(GPIO1): LO → HI
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