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PDF GS5571 Data sheet ( Hoja de datos )
| Número de pieza | GS5571 | |
| Descripción | 600mA Synchronous Step-Down Converter | |
| Fabricantes | GlobalTech | |
| Logotipo |  |
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1.5 MHz, 600mA Synchronous Step-Down Converter
With Low Quiescent Current
Product Description
Features
GS5571 is a 1.5Mhz constant frequency, slope
compensated current mode PWM step-down
converter. The device integrates a main switch and a
synchronous rectifier for high efficiency without an
external Schottky diode. It is ideal for powering
portable equipment that runs from a single cell
lithium-Ion (Li+) battery.
The GS5571 can supply 600mA of load current from a
2.5V to 5.5V input voltage. The output voltage can be
regulated as low as 0.6V. The GS5571 can also run at
100% duty cycle for low dropout operation, extending
battery life in portable system. Idle mode operation at
light loads provides very low output ripple voltage for
noise sensitive applications.
High Efficiency: Up to 96%.
1.5Mhz Constant Switching Frequency.
600mA Output Current at VIN=3.0V.
Integrated Main switch and synchronous
rectifier.
No Schottky Diode Required.
2.5V to 5.5V Input Voltage Range.
Output Voltage as Low as 0.6V.
100% Duty Cycle in Dropout.
Low Quiescent Current: 30µA.
<1uA Shutdown Current.
Slope Compensated Current Mode Control for
Excellent Line and Load Transient Response.
Short Circuit and Thermal Fault Protection
Space Saving 5-Pin Thin SOT23 package.
The GS5571 is offered in a low profile (1mm) 5-pin,
thin SOT package, and is available in an adjustable
version and fixed output voltage of 1.2V, 1.5V and
1.8V
Applications
Cellular and Smart Phones
PDAs
MP3 Player
DSP Core Supplies
Digital Still Cameras
Portable instruments
Block Diagram
www.DataSheet4U.com
OSC
SLOPE
COMP
BLANKING
X
VFB/
VOUT
0.6V
R1
R2
+
EA
-
0.65V
VIN
SQ
-
COMP
RQ
+
RS LATCH
+
-
OVDET
PWM
LOGIC
RUN
Vref
0.6V
SHUTDOWN
ISENCE
COMP
+
-
DRV
NON-
OVERLAP
CONTROL
+
-
IZERO
COMP
VIN
2.7-5.5V
Vin
SW
COUT
GND
VOUT
R1
R2
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1 page  
Globaltech Semiconductor
Typical Performance Characteristics (Continue)
Efficiency vs Load Current
100
95 2.7V
90
85
80
4.2
75
70
65 3.6V
60
55
50 TA = 25C
45 Vout = 2.5V
40
0.1
1 10 100
LOAD CURRENT (mA)
1000
Outpu Voltage vs Load Current
1.84
1.82
1.8
1.78
1.76
1.74
1.72
1.7
1.68
1.66
www.DataSheet4U1..c6o4m
0
VOUT = 1.8V
VIN = 3.6V
L = 2.2uH
200 400 600 800 1000 1200
LOAD CURRENT (mA)
Frequency vs Input Voltage
1.46
1.45
1.44
1.43
VOUT = 1.8V
ILOAD = 150mA
L = 2.2uH
1.42
1.41
1.4
1.39
1.38
1.37
1.36
2.7
3.15
3.6 4.05 4.5 4.95
INPUT VOLTAGE (V)
5.4
RDS(ON) vs Input Voltage
0.50
0.45
0.40
0.35 MAIN SWITCH
0.30
0.25
0.20
SYNCHRONOUS SWITCH
0.15
0.10
1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5
INPUT VOLTAGE (V)
Reference Voltage vs Temperature
0.6080
0.6072 VIN = 3.6V
0.6064
0.6056
0.6048
0.6040
0.6032
0.6024
0.6016
0.6008
-50 -30 -10 10 30 50 70 90
TEMPERATURE (C)
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5
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Globaltech Semiconductor
www.DataSheet4U.com
NOTICE
Information furnished is believed to be accurate and reliable. However Globaltech Semiconductor assumes no
responsibility for the consequences of use of such information nor for any infringement of patents or other rights of
third parties, which may result from its use. No license is granted by implication or otherwise under any patent or
patent rights of Globaltech Semiconductor. Specifications mentioned in this publication are subject to change
without notice. This publication supersedes and replaces all information without express written approval of
Globaltech Semiconductor.
(Revise Date:2007/11/13 Version_1.0)
www.gs-power.com
11
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet GS5571.PDF ] | |
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