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SI9150CY-T1-E3 Fiches technique(PDF) 1 Page - Vishay Siliconix

No de pièce SI9150CY-T1-E3
Description  Synchronous Buck Converter Controller
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Fabricant  VISHAY [Vishay Siliconix]
Site Internet  http://www.vishay.com
Logo VISHAY - Vishay Siliconix

SI9150CY-T1-E3 Fiches technique(HTML) 1 Page - Vishay Siliconix

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Si9150
Vishay Siliconix
Document Number: 70020
S-40752—Rev. F, 19-Apr-04
www.vishay.com
1
Synchronous Buck Converter Controller
FEATURES
D 6- to 16.5-V Input Range (Si9150CY)
D Voltage-Mode PWM Control
D Low-Current Standby Mode
D Enable Control
D Dual 100-mA Output Drivers
D 2% Band Gap Reference
D Multiple Converters Easily Synchronized
D Over-Current Protection
DESCRIPTION
The Si9150 synchronous buck regulator controller is ideally
suited for high-efficiency step down converters in
battery-powered equipment. Combined with the Si9943DY
MOSFET half-bridge, a 90% efficient, 7.5-W, 3.3-V or 5-V
power supply can be implemented using standard surface-
mount assembly techniques. The wide input range allows
operation from NiCd or NiMH battery packs using six to ten
cells.
Over-current protection is achieved by sensing the on-state
voltage drop across the high side p-channel MOSFET, which
eliminates the need for a current sense resistor.
Duty ratios of 0 to 100% and switching frequencies up to 300
kHz are possible. The IC can be disabled by pulling EN low
(IDD = 100 mA), or the 2.5-V reference can be maintained, with
all other functions disabled, by pulling STBY low (IDD =
500 mA).
The Si9150 is available in both standard and lead (Pb)-free
14-pin SOIC and rated for the commercial temperature range
of 0 to 70_C (C suffix), and the industrial temperature range of
−40 to +85_C (D suffix).
FUNCTIONAL BLOCK DIAGRAM
Synchronous Buck Regulator Controller
STBY
SS
GND
ISENSE
+
0.5 V
VDD
EN
P-GATE
R
Q
S
Oscillator,
Comparators,
& Error Amp
Reference
Generator
Power Down
UVLO
+
+
Ref
Gen
OSC
R
Q
S
Break-
Before-
Make
Logic
N-GATE
1 V
SYNC
CT
RT
COMP
FB
VREF
Error
Amplifier
4.7 V
500 kW
Strobe
VDD
Current
Limit
1
2
3
4
5
6
7
8
910
11
12
13
14
20 mA
5 W


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