SP6650 Datasheet, PDF (1/17 Pages) Sipex Corporation – High Efficiency 600mA Synchronous Buck Regulator Ideal for portable designs powered with Li Ion battery

®
SP6650
High Efficiency 600mA Synchronous Buck Regulator
Ideal for portable designs powered with Li Ion battery
FEATURES
■ 95% High Efficiency
■ Proprietary Control Loop
■ 2.7V to 6.5V Input Voltage Range
■ 3.3V or Adjustable Output Voltage
Range
■ 2% Output Voltage Accuracy
■ 600mA Output Current
■ 100% Duty Cycle Operation
■ Programmable Inductor Peak Current
Limit (0.95A or 0.5A)
■ No External FET's Required
■ 3V Battery Low Indicator
■ 2.7V Undervoltage Lockout
■ Shutdown Control
■ Small 10-Pin MSOP
PV_IN 1
V_IN 2
BLON 3
I_LIM 4
SHDN 5
SP6650
10 Pin MSOP
10 LX
9 _PGND
8 _GND
7 _VOUT
6 _FB
Now Available in Lead Free Packaging
APPLICATIONS
■ PDA
■ CD Player
■ ADSL Modem
■ Digital Still Camera
DESCRIPTION
The SP6650 is ideal for portable applications that use a Li-Ion or 3 to 4 cell alkaline/NiCd/NiMH
input. The SP6650 extends battery life with it’s unique control loop scheme (patent pending),
which maintains high efficiency levels (> than 90%) over a wide range of output currents. Features
such as Inductor peak current control, protects the power supply from overload or short circuit
conditions, controls the startup current to prevent output overshoot and excessive battery drop,
and gives the user more flexibility in choosing an appropriate coil to optimize solution cost, size
and performance. Other features include a dedicated pin for manual shutdown, a battery low
indicator, and thermal protection.
TYPICAL APPLICATIONS CIRCUIT
R4
100kΩ
2.7-6.5 VDC
RB
100kΩ _R1
10Ω
C1
1µF
1 _PVIN
®
LX ¹⁰
2 _VIN
PGND ⁹
3
SP6650
BLON
GND
8
4 _ILIM
5 _SHDN
V_OUT ⁷
FB ⁶
C2
47µF
L1 22µH
C4
470pF
R2
164k
R3
100k
V_OUT
3.3V or 1.25V
to 5.0V
C3
47µF
Date: 5/25/04
SP6650 High Efficiency 600mA Synchronous Buck Regulator
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© Copyright 2004 Sipex Corporation