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