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| SI9174 Datasheet, PDF (3/17 Pages) Vishay Siliconix – High Performance Step-Down DC-DC Converter With Dynamically Adjustable Output Voltage | |||
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Si9174
Vishay Siliconix
SPECIFICATIONS
Parameter
Modef Symbol
Converter Operation
Maximum Output
Current
PWM
Maximum Output
Current
Dropout Voltagee
Closed Loop Bandwidth
Load Regulationc
PSM
PWM
PSM
Line Regulation
PWM
PSM
PWM/PSM Switch Threshold Current
Maximum Inductor Peak Current Limit
Maximum NMOS
Transistor Current Sink
PWM
On Resistance
Output Ripple Voltage
Efficiency
Frequency
P-Channel
N-Channel
PWM
PSM
PWM
PSM
PSM
ILOAD
ILOAD
VDD
BW
IAUpk
ILpk
rDS(on)
Supply Current
Test Conditions Unless Specified
â40_C to 85_C, VIN = VDD, VDAC = 1.215 V, CIN = 10 mF,
COUT = 4.7 mF, L = 2.2 mH, 2.6 V v VIN v 5.5 V
R1 = 11.3 kW, R2 = 20 kW
VIN = 3.6 V
VIN = 3.6 V
VIN = 2.6 V, IOUT = 600 mA
VIN = 3.6 V
VOUT = 1.9 V @ 25_C
IOUT = 30 mA to 600 mA
IOUT = 30 mA to 75 mA
VOUT = 3.0 V, VIN = 3.5 V to 5.5 V
Negative Transition on VDAC
VIN = 3.6 V
0.05 W COUT(ESR)
VIN = 3.6 V, VOUT = 3.3 V
IOUT w 30 mA
IOUT = 600 mA
IOUT = 30 mA
IOUT = 600 mA
IOUT = 30 mA
Limits
Mina Typb Maxa Unit
600
mA
150
mA
190
300
mV
300
kHz
0.5
%
0.25
"0.1
%/V
"0.1
200
1500
mA
1500
250
250
60
80
90
80
20
mW
mVp-p
%
kHz
Input Supply Current
Shutdown Supply Current
PWM
PSM
ISUPPLY
(VDD &
VIN)
ISD
IOUT = 0 mA, VIN = 3.6 V (not switching, FB = GND)
SD = Low
500
800
400
mA
2
Thermal Shutdown
Thermal Shutdown Temperaturec
Thermal Hysteresisc
TJ(S/D)
165
_C
20
Notes
a. The algebraic convention whereby the most negative value is a minimum and the most positive a maximum, is used in this data sheet.
b. Typical values are for DESIGN AID ONLY, not guaranteed or subject to production testing.
c. Guaranteed by design.
d. Settling times, ts, apply after ten.
e. Bypass is a device mode of operation, in which, the device is in 100% duty cycle. Bypass operation is possible in either PWM or PSM.
f. Operating modes are controlled with the MODE pin where Auto mode = MODE = LOW, PWM Mode = MODE = HIGH, and PSM mode = MODE = OPEN.
Document Number: 71668
S-41148âRev. C, 14-jun-04
www.vishay.com
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