3MHz Dual 1500mA Step-Down Converters and Dual
Low-Input LDOs
ISL9307
Features
The ISL9307 is an integrated mini Power Management IC
(mini-PMIC) ideal for applications for powering low-voltage
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).
• Dual 1500mA, Synchronous Step-down Converters and Dual
300mA, General-purpose LDOs
• Input Voltage Range
- DCD1/DCD2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5V to 5.5V
- VINLDO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5V to 5.5V
• Adjustable Output Voltage
- VODCD1/VODCD2 . . . . . . . . . . . . . . . . . . . . . . . . 0.8V to V
IN
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.
• 50μA I (Typ) with DCD1/DCD2 in Skip Mode; 20μA I (Typ)
Q
Q
for each Enabled LDO
• EN Pins for DCD1/DCD2 and LDO1/LDO2
• Small, Thin, 4mmx4mm TQFN
The ISL9307 features EN pins for each channel, thus allowing
startup delay for power sequencing.
Applications
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.
• 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
September 20, 2012
FN7931.3
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas Inc. 2012. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
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