SI9174 Datasheet, PDF (7/17 Pages) Vishay Siliconix – High Performance Step-Down DC-DC Converter With Dynamically Adjustable Output Voltage

APPLICATIONS CIRCUIT
BATT
C_IN
C₁
10 mF
C₂
13 MHz
DAC
ENABLE
PWM/PSM/AUTO
V_IN
LX
V_DD
Si9174
SYNC
DAC
SD
MODE
PGND
FB
AGND
2.2 mH
C_OUT
4.7 mF
TYPICAL CHARACTERISTICS
V_OUT
3.83
Si9174
Vishay Siliconix
V_OUT
R₁
R₂
C_IN = 10 mF, Ceramic, Murata GRM42-2X5R106K16
C₁, C₂ = 0.01 mF, Vishay VJ0603Y 104KXXAT
C_OUT = 4.7 mF, Ceramic, Murata GRM42-6X5R475K16
R₁ = 8.2 kW, Vishay CRCW06031132F
R₂ = 20 kW, Vishay CRCW06032002F
L₁ = 2.2 mH, Toko A914BYW-2R2M
Document Number: 71668
S-41148—Rev. C, 14-jun-04
0.44
Figure 1.
0.28
2.45
V_DAC
V_OUT-vs. V_DAC Characteristics (V_IN = 5 V)
V_SDH
SD
V_SDL
ÉÉÉÉÉÉÉÉÉÉÉÉ VDAC
Don’t
Care
t_r
0.2 V
t_f
t_r
2.5 V
t_s
t_en
3.47 V
t_f
ÉÉÉ _Don’t
ÉÉÉÉÉÉ Care
Undefined
(Load Dependent)
V_OUT
0.4 V
t_s
Time
d Indicates V_OUT settles to $2% of the final value.
Figure 2. PWM Mode V_OUT Settling
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