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ISL9307IRTWCWNEV1Z

更新时间： 2024-11-25 00:41:31
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3MHz Dual 1500mA Step-Down Converters and Dual Low-Input LDOs

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DATASHEET  
ISL9307  
FN7931  
Rev 3.00  
September 20, 2012  
3MHz Dual 1500mA Step-Down Converters and Dual Low-Input LDOs  
The ISL9307 is an integrated mini Power Management IC  
Features  
(mini-PMIC) ideal for applications for powering low-voltage  
• Dual 1500mA, Synchronous Step-down Converters and Dual  
300mA, General-purpose LDOs  
microprocessor or multiple voltage rails with a battery as an  
input source, such as a single Li-ion or Li-polymer. ISL9307  
integrates two high-efficiency, 3MHz, synchronous step-down  
converters (DCD1 and DCD2) and two low-input, low-dropout  
linear regulators (LDO1 and LDO2).  
• Input Voltage Range  
- DCD1/DCD2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5V to 5.5V  
- VINLDO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5V to 5.5V  
The 3MHz PWM switching frequency allows the use of very  
small external inductors and capacitors. Both step-down  
converters can enter skip mode under light load conditions to  
further improve efficiency and maximize battery life.  
• Adjustable Output Voltage  
- VODCD1/VODCD2 . . . . . . . . . . . . . . . . . . . . . . . . 0.8V to V  
IN  
• 50μA I (Typ) with DCD1/DCD2 in Skip Mode; 20μA I (Typ)  
Q
Q
for each Enabled LDO  
The ISL9307 features EN pins for each channel, thus allowing  
startup delay for power sequencing.  
• EN Pins for DCD1/DCD2 and LDO1/LDO2  
• Small, Thin, 4mmx4mm TQFN  
The ISL9307 also provides two 300mA low-dropout (LDO)  
regulators. The input voltage range is 1.5V to 5.5V, which  
allows them to be powered from one of the on-chip step-down  
converters or directly from a battery. The default LDO power-up  
output comes with factory pre-set fixed output voltage options  
between 0.9V and 3.3V.  
Applications  
• Cellular Phones, Smart Phones  
• PDAs, Portable Media Players, Portable Instruments  
• Single Li-ion/Li-polymer Battery-Powered Equipment  
• DSP Core Power  
The ISL9307 is available in a 4mmx4mm 16 Ld TQFN.  
L1 = 1.5µH  
2.5V TO 5.5V  
VINDCD1  
SW1  
FB1  
1500mA  
VINDCD2  
C1  
R1  
C4  
10µF  
10µF  
R2  
ENDCD1  
ENDCD2  
L2 = 1.5µH  
SW2  
FB2  
1500mA  
ISL9307  
C5  
10µF  
R3  
ENLDO1  
R4  
ENLDO2  
1.5V TO 5.5V  
VINLDO  
C2  
VOLDO1  
VOLDO2  
300mA  
300mA  
1µF  
C6  
1µF  
C7  
1µF  
GNDDCD1  
GNDDCD2  
GNDLDO  
NOTE: ONLY FOR ADJUSTABLE OUTPUT VERSION. FOR FIXED  
OUTPUT VERSION, DIRECTLY CONNECT THE FB PIN TO THE  
OUTPUT OF THE BUCK CONVERTER.  
FIGURE 1. TYPICAL APPLICATION DIAGRAM  
FN7931 Rev 3.00  
Page 1 of 13  
September 20, 2012  
1234567...13

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