LSP6501
1.6A, 1.3MHz, Boost DC-DC Converter
With Internal Switch
GENERAL DESCRIPTION
The LSP6501 is a current mode step up
converter that can carry out 1.6A. LSP6501 also
builds up a internal switch with 0.23Ω to provide a
high efficient regulator with fast response. The
LSP6501 can be operated at 640KHz or 1.3MHz
allowing for small filter solution and low noise. An
external compensation pin gives the user
flexibility in setting up loop compensation, which
allows to use a low- ESR ceramic output
capacitors. Internal Soft-start function results in
small inrush current and the sofe-start can be
programmed with an external capacitor.
The LSP6501 device includes under-voltage
lockout, and current limiting protection preventing
damage in the event of an output overload. A low
profile 8-pin MSOP packages is available in the
LSP6501.
FEATURES
1. 1.6A, 0.23Ω, Internal Switch
2. Input Range: +2.6V to +5.5V
3. Low Shutdown Current: 0.1uA
4. Adjustable Frequency: 640kHz or 1.3MHz
5.
Small 8-Pin MSOP Package
TYPICAL APPLICATIONS
TFT-LCD Power Management
Portable DVD Player Power Management
PIN ASSIGNMENT
COMP
FB
SHDN
GND
1
2
3
4
8
7
6
5
SS
FREQ
V
DD
SW
MSOP-8
(Top View)
PIN DESCRIPTION
Pin
1
2
3
4
5
6
7
8
Name
COMP
FB
SHDN
GND
SW
V
DD
FREQ
SS
Compensation Pin for Error Amplifier
Feedback Pin with a Typical Reference Voltage of 1.24V, V
OUT
= 1.24×(1+ R1/R2).
Shutdown Control Pin. When SHDN is Low, the LSP6501 Will Turn Off
Ground
Switch Pin
Power Supply Pin
Frequency Select Pin. Oscillator Frequency to 640kHz When FREQ is Low, and
1.3MHz When FREQ is High
Soft-Start Control Pin.
Function
1/10
VER. 1.2
LSP6501
1.6A, 1.3MHz, Boost DC-DC Converter
With Internal Switch
TYPICAL APPLICATION CIRCUIT
V
IN
2.6 ~ 5.5V
DC
C
IN
VCC
FREQ
COMP
L
SW
V
OUT
D
F
R
1
FB
R
3
C
3
C
OUT
A304
LSP6501
SS
GND
C
P2
C
P1
R
P
C
SS
R
2
ABSOLUTE MAXIMUM RATINGS
Parameters
SW to GND
Input Voltage: SHDN / V
DD
/ FREQ to GND
SS to GND
SW pin maximum current
Operating temperature
Maximum Operating Junction Temperature, T
J
Storage Temperature Range
Value
18
6
-0.3 ~ V
DD
+ 0.3
2.3
-20 ~ +85
150
°
-45 to 125
Unit
V
V
V
A
°C
°C
°C
°C
Lead Temperature (Soldering, 10 seconds)
260
Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground.
Currents are positive into, negative out of the specified terminal.
THERMAL IMPEDIENCE
Thermal Resistance from Junction to Ambient,
θ
JA
152°C /W
ELECTRICAL CHARACTERISTICS
(V
DD
=SHDN=3V, FREQ=GND; T
A
=25°C, unless otherwise noted)
Parameter
Input Voltage Range
V
DD
Under voltage Lockout
Quiescent Current
Symbol
V
DD
UVLO
I
DD
When V
DD
is rising, typical hysteresis
is 40mV; SW remains off below this
level
V
FB
=1.3V, Not switching
V
FB
=1.0V, switching
2/10
__________
Conditions
Min
2.6
2.25
Typ
Max
5.5
Unit
V
V
mA
mA
VER. 1.2
2.38
0.21
1.2
2.52
0.35
5.0
LSP6501
1.6A, 1.3MHz, Boost DC-DC Converter
With Internal Switch
Shutdown Current
FB Reference Voltage
FB Input Current
FB Voltage Line
Regulation
Error Amp
Transconductance*
Error Amp Gain*
Oscillated Frequency
Maximum Duty Cycle
Current Limit
ON-Resistance
Leakage Current
Reset Switch Resistance
Soft Start Charge current
Input Low Voltage
Input High Voltage
Hysteresis
FREQ Pull-Down Current
SHDN Input Current
I
FREQ
I
shutdown
Iss
V
IL
V
IH
__________
__________
I
SC
V
FB
I
bias
SHDN = GND
1.228
V
FB
=V
REF
COMP=FB, 2.6V＜V
DD
＜5.5V
-
70
-
FREQ=GND
FREQ=V
DD
FREQ=GND
FREQ=V
DD
V
DD
=1V, D=0.65
Isw=1.2A
V
SW
=12V
Vss=1.2V
SHDN, FREQ; V
DD
=2.6V to 5.5V.
SHDN, FREQ; V
DD
=2.6V to 5.5V.
SHDN, FREQ;
1.8
__________
__________
0.1
1.24
1
0.1
105
1500
640
1320
85
85
1.2
1.6
0.23
0.01
1.5
0.7V
DD
0.1V
DD
5.0
0.001
4
10
1.252
40
0.15
240
-
740
1600
92
2.3
0.5
20
300
7
0.3V
DD
uA
V
nA
%/V
uA/
V
V/V
kHz
%
A
Ω
uA
Ω
uA
V
V
V
Gm
A
V
Fosc
D
MAX
I
LIM
R
ON
I
SWOFF
I
COMP
=±5uA
540
1100
79
9.0
1
uA
uA
*: Guaranteed by design, not 100% tested in production.
FUNCTIONAL BLOCK DIAGRAM
5
SW
FREQ
7
Sync
Oscillator
Ramp
Summer
LOGIC
S CONTROL
R
Driver
Switch
SHDN
3
Slope
Compensation
Error
Amp
∑
＋
－
PWM
Comparator
Current
Sense
63mΩ
4
GND
FB
2
1.24V
Reference
－
＋
6
V
DD
8
SS
COMP
1
3/10
VER. 1.2
LSP6501
1.6A, 1.3MHz, Boost DC-DC Converter
With Internal Switch
TYPICAL CHARACTERISTICS
Unless otherwise specified, T
A
= 25°C.
Efficiency vs. Output Current
100%
90%
V
IN
=3.3V
Efficiency vs. Output Current
100%
Fose=1.2MHZ
L=4.7uH
V
IN
=5V
Fose=640KHZ
L=4.7uH
V
IN
=5V
90%
V
IN
=3.3V
V
IN
=2.7V
V
IN
=2.7V
80%
Efficiency
70%
60%
50%
40%
0
40
80
120
80%
Efficiency
70%
60%
50%
40%
160
200
0
40
80
120
160
200
Output Current (mA)
Output Current (mA)
Output Voltage vs . Load Curre nt
10.0
Fosc=640KHZ
VIN=3.3V
Output Voltage vs . Load Curre nt
10.0
Fosc=1.2MHZ
VIN=3.3V
Output Voltage (V)
8.0
Output Voltage (V)
9.0
9.0
8.0
7.0
0
40
80
120
160
200
Load Current (mA)
7.0
0
40
80
120
160
200
Load Current (mA)
Curre nt Lim it vs . Duty Cycle
2.4
L=4.7uH
M ax Load Curre nt vs . Input Voltage
900
VIN=3.3V
L=4.7uH
2.2
Output Current (mA)
1.2MHZ
790
1.2MHZ
Limit Current (A)
2.0
680
640KHZ
1.8
640KHZ
570
1.6
460
1.4
20%
40%
Duty (%)
60%
80%
350
2.5
3.0
3.5
4.0
4.5
5.0
Input Voltage (V)
4/10
VER. 1.2
LSP6501
1.6A, 1.3MHz, Boost DC-DC Converter
With Internal Switch
FUNCTION DESCRIPTION
V
IN
2.6 ~ 5.5V
DC
C
IN
VCC
FREQ
COMP
L
SW
V
OUT
D
F
R
1
FB
R
3
C
3
C
OUT
LSP6501
A304
SS
GND
C
P2
C
P1
R
P
C
SS
R
2
C.R NO
IC
D
F
C
IN
C
OUT
L
R
1
R
2
R
P
(R
3
) *
NOTE 2
(C
3
) *
NOTE 2
(C
P1
)
C
P2
C
SS
*NOTE 1: V
OUT
=V
FB
(1+R
1
/R
2
)
Q’TY
1
1
1
2
1
1
1
1
1
1
1
1
1
Value
-
-
10uF / 10V
10uF / 25V
4.7uH
*
NOTE 1
12K
10K
(Optional)
(Optional)
(Optional)
10nF
1uF
Description
LSP6501
Schottky Diode 40V/2A
CAP CER SMD
CAP CER SMD
1.0A NR4018-100M
Chip Resistor / 1%
Chip Resistor / 1%
Chip Resistor / 1%
Chip Resistor / 1%
CAP CER X7R
CAP CER X7R
CAP CER X7R
CAP CER X7R
Package
MSOP-8
SMA
SMD 1206
SMD 1206
SMD
SMD 0603
SMD 0603
SMD 0603
SMD 0603
SMD 0603
SMD 0603
SMD 0603
SMD 0603
*NOTE 2: R
3
& C
3
& C
P1
are used for improving the transient performance. Because the components are
not ideal, sometimes the system needs R
3
& C
3
& C
P1
to get better transient. The value is
determined according to real load conditions.
1. Setting the Output Voltage
FB pin is used to set the output voltage V
OUT
of the LSP6501. By using the resistor divider, R
1
and R
2
, to
divide V
OUT
to the FB pin as feedback signal, the output voltage is determined by:
V
FB
=
V
OUT
⋅
R
2
R
1
+
R
2
⎛
R
⎞
⋅ ⎜
1
+
1
⎟
⎜
R
2
⎟
⎝
⎠
⎛
R
⎞
V
OUT
=
V
FB
⋅ ⎜
1
+
1
⎟ =
1 .24
V
⎜
R
2
⎟
⎝
⎠
Where, the feedback pin voltage, V
FB
, is fixed at 1.24V.
2. Selection of Output Capacitor
It is recommended to select output capacitors that the capacitance is high enough and the ESR (Effective
Series Resistance) is low enough. These (high capacitance & low ESR) are very important for the Boost
Converter to be able to meet the V
OUT
ripple and load transient specifications.
Ceramic capacitors often have low ESR and can meet the Boost Converter requirements as long as the
capacitance values are enough. Note that the capacitance values of all kinds of ceramic capacitor drop when
5/10
VER. 1.2
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