SP6649EU [SIPEX]
Ultra-low Quiescent Current, High Efficiency Boost DC-DC Regulator; 超低静态电流，高效率升压型DC -DC稳压器
| 型号： | SP6649EU |
| 厂家： | 
SIPEX CORPORATION |
| 描述： | Ultra-low Quiescent Current, High Efficiency Boost DC-DC Regulator |
| 文件： | 总9页 (文件大小：140K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
®
SP6649
Ultra-low Quiescent Current,
High Efficiency Boost DC-DC Regulator
FEATURES
■ Ultra-low 12µA Quiescent Current
■ 700mA Output Current at 2.6VIN, 3.3VOUT
■ 94% Efficiency Possible
1
2
3
4
5
10
9
V
V
OUT
BATT
LBI
Top View
LX
■ Wide Input Voltage Range: 0.85V to 4.5V
10 pin MSOP
PGND
GND
FB
8
LBON
■ 3.3V Fixed Output and adjustable 2.5V to
7
R
LIM
5.0V Output Range
Tja=113°C/W
SHDN
6
■ Internal Synchronous Rectifier for High
Efficiency
■ 0.3 Charging Switch, 0.3 Synchro-
nous Rectifier
■ Anti-Ringing Inductor Switch
■ Programmable Inductor Peak Current
■ Logic Shutdown Control
■ Under Voltage Lock-Out, 0.62V
■ Programmable Low Battery Detect
■ Small 10 pin MSOP Package
APPLICATIONS
■ Digital Still Cameras
■ MP3 Players
■ PDA's
■ Pagers
■ Handheld Portable Devices
■ Medical Monitors
DESCRIPTION
The SP6649 is an ultra-low quiescent current, high efficiency step-up DC-DC converter ideal for
single and dual cell alkaline, or Li-Ion battery applications such as digital still cameras, PDA’s,
MP3 players, and other portable devices. The SP6649 combines the high delivery associated
withPWMcontrol,andthelowquiescentcurrentandexcellentlight-loadefficiencyofPFMcontrol.
TheSP6649features12µAquiescentcurrent, synchronousrectification, a0.3 chargingswitch,
anti-ringing inductor switch, programmable low battery detect, under-voltage lockout and
programmable inductor peak current. The device can be controlled by a 1nA active LOW
shutdown pin.
VBATT
L1 10uH
C1
3.3Vout
+
1
2
3
4
5
10
9
VBATT
VOUT
LX
47uF
SP6649
C4
1uF
LBI
LBI
R1
8
+
C3
C2
LBON
RLIM
SHDN
PGND
GND
FB
LBON
205K
7
47pF
47uF
6
SHDN
TBD
RLIM
1.87K
R2
124K
C1 = C2 = Kemet T49C476K010AS, L1 = Sumida CDRH5D28-100
R1 = 374K for 5VOUT
Figure 1. Typical Application Circuit
Figure 2. Maximum Load Current in Operation
Rev:001 Date:11/20/03
SP6649 Ultra-low Quiescent Current, High Efficiency Boost DC-DC Regulator
© Copyright 2002 Sipex Corporation
1
LX, Vo, VBATT , LBON, FB to GND pin ................................. -0.3 to 6.0V
SHDN, LBI ............................................................ -0.3V to VBATT +0.5V
Vo, GND, LX Current .................................................................... 1.3A
Reverse VBATT Current ............................................................... 220mA
Forward VBATT Current ............................................................... 500mA
Storage Temperature .................................................. -65 °C to 150°C
Operating Temperature ................................................ -40°C to +85°C
Lead Temperature (Soldering, 10 sec) ....................................... 300 °C
ESD Rating ........................................................................... 2kV HBM
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation of the device at
these ratings or any other above those indicated in the operation
sections of the specifications below is not implied. Exposure to
absolute maximum rating conditions for extended periods of time may
affect reliability.
SPECIFICATIONS
VBATT=VSHDN = 1.3V, VFB=0V, ILOAD = 0mA, TAMB= -40°C to +85°C, VOUT = +3.3V, typical values at 27°C unless otherwise
noted.
PARAMETER
MIN
TYP
MAX
UNITS
V
CONDITIONS
Input Voltage Operating Range, VBATT
Under Voltage Lock-out/UVLO
Start-up Input Voltage, VBATT
Output Voltage, VO
0.7
4.5
After Startup
0.62
0.85
3.30
12
V
0.9
3.44
22
V
RLOAD = 3k
3.16
V
3.3V VO preset
Quiescent Current into VO, IQO
Quiescent Current into VBATT, IQB
Shutdown Current into VO, ISDO
Shutdown Current into VBATT, ISDB
Efficiency, RLIM = 4.0K
µA
nA
nA
nA
VOUT = 3.3V, VFB = 1.5V, Toggle SHDN
VOUT = 3.3V, VFB = 1.5V
VSHDN = 0V
20
500
500
500
1
200
VSHDN = 0V, VBATT = 2.6V
85
91
%
%
VBATT = 1.3V, IOUT = 50mA
VBATT = 2.6V, IOUT = 100mA
Efficiency, RLIM = 1.87K
Inductor Current Limit, IPK
Output Current
85
92
%
%
VBATT = 1.3V, IOUT = 100mA
VBATT = 2.6V, IOUT = 200mA
1.0
1.2
1.4
A
RLIM = 1.17k , I PK = 1400/RLIM
250
700
mA
mA
VBATT = 1.3V, RLIM = 1.17k
VBATT = 2.6V, RLIM = 1.17k
150
400
mA
mA
VBATT = 1.3V, RLIM = 1.87k
VBATT = 2.6V, RLIM = 1.87k
Minimum Off-Time Constant KOFF
Maximum On-Time Constant KON
NMOS Switch Resistance
PMOS Switch Resistance
FB Set Voltage, VFB
1.1
3.3
V*µs
V*µs
tOFF K OFF / (VOUT- VBATT
tON K ON / VBATT
INMOS = 100mA
)
0.30
0.30
1.25
1
0.6
0.6
IPMOS = 100mA
1.20
1.30
100
V
nA
V
External feedback
VFB =1.3V
FB Input Current
LBI Falling Trip Voltage
LBI Hysteresis
0.594
0.625
25
0.656
mV
V
Low Output Voltage for LBON, VOL
Leakage current for LBON
0.4
500
0.25
VBATT = 1.3V, Isink = 1mA
VBATT = 1.3V, VLBON = 3.3V
nA
SHDN Input Voltage
SHDN Input Current
VIL
VIH
VIL
VIH
VBATT = 1.3V
VBATT = 1.3V
VBATT = 2.6V
VBATT = 2.6V
1.0
2.0
V
0.5
1
100
nA
Rev:001 Date:11/20/03 SP6649 Ultra-low Quiescent Current, High Efficiency Boost DC-DC Regulator
© Copyright 2002 Sipex Corporation
2
PIN DESCRIPTION
PIN NUMBER
PIN NAME
VBATT
DESCRIPTION
1
Battery Voltage pin. The startup circuitry runs off of this pin. The
operate circuit also uses this voltage to regulate the off-time
[tOFF = KOFF/ (VOUT - VBATT)]. When the battery voltage drops below
0.62V after a successful startup the SP6649 goes into an undervoltage
lockout mode (UVLO).
2
LBI
Low Battery Input pin. LBI below 0.61V causes the LBON pin to pull
down to ground. Use a resistor divider to program the low voltage
threshold for each battery configuration.
3
4
LBON
RLIM
Low Battery Output Not pin. Open drain NMOS output that sinks
current to ground when LBI is below 0.625V.
Resistor Programmable Inductor Peak Current. By connecting a
resistor RLIM from this pin to ground the inductor peak current is set by
IPEAK=1400/RLIM. The range for RLIM is 4.0K (for 350mA) to 1.17K
(for 1.2A).
5
6
SHDN
FB
Shutdown Not. Tie this pin to VBATT for normal operation. Tie this pin
to ground to disable all circuitry inside the chip. In shutdown the
output voltage will float down to a diode drop below the battery
potential.
External Feedback pin. Connect this pin to GND for fixed +3.3V
operation. Connect this pin to a resistor voltage divider between VOUT
and GND for adjustable output operation.
7
8
9
GND
PGND
LX
Ground pin for the internal regulator bias currents.
Switch ground pin. The inductor charging current flows out of this pin.
Inductor switching node. Connect one terminal of the inductor to the
positive terminal of the battery. Connect the second terminal of the
inductor to this pin. The inductor charging current flows into LX,
through the internal charging N-channel FET, and out the GND pin.
10
VOUT
Output Voltage pin. The inductor current flows out of this pin during
the off-time. It is also the internal regulator voltage supply, and
minimum off-time one shot input. Kelvin connect this pin to the
positive terminal of the output capacitor.
Rev:001 Date:11/20/03
SP6649 Ultra-low Quiescent Current, High Efficiency Boost DC-DC Regulator
© Copyright 2002 Sipex Corporation
3
BLOCK DIAGRAM
VBATT
LX
QKILL
charge end
IUC
VO
VBATT
undercurrent
comparator
INTERNAL
Vbatt
TOFF
Min
Toff
INTERNAL
SUPPLY
VOUT
-
UVLO
QKILL
c
switch
buffer
SHDN
SDI
0.61V
+
PMOS
VO
VBATT
R
Q
CHARGE
NMOS
Max
Ton
n
Ref
Block
IBIAS
1.25V
REF
FB
SDI
+
-
VOLOW
S
c
LX
+
Qn
LOAD
c
current
reference
0.61V
-
+
c
overcurrent
comparator
-
FB
PGND
SWITCH GROUND
current
control
current
reference
Ipkset
INTERNAL
GROUND
Rlim
GND
LBON
-
LBI
c
0.61V
+
SP6649
THEORY OF OPERATION
Detailed Desctiption:
Control Scheme:
A minimum off-time, current limited pulse fre-
quencymodulation(PFM)controlschemecom-
bines the high output power and efficiency of a
pulse width modulation (PWM) device with the
ultra low quiescent current of the traditional
PFM. At low to moderate output loads the PFM
controlprovidesahigherefficienciesthantradi-
tional PWM converters are capable of deliver-
ing. At these loads the switching frequency is
The SP6649 is a step-up DC-DC converter that
starts up with input voltages as low as 0.85V
(typically)andoperateswithinputvoltagesdown
to 0.62V. The ultra low quiescent current of
12µA provides excellent efficiencies. In addi-
tion to the 0.3 internal MOSFET the SP6649
has an internal synchronous rectifier eliminat-
ing the need for an external diode. An internal
inductive-dampingswitchsignificantlyreduces
inductive ringing. If the supply voltage drops
below 0.62V the SP6649 goes into under volt-
age lock-out opening up the internal switches.
An externally programmable low battery detec-
tor with open drain output provides the user the
abilitytomonitorthesupplyvoltage. Theinduc-
tor peak current is externally programmable to
allow for a range of inductors.
determined by a minimum off-time (tOFF
,
)
MIN
and a maximum on-time (tON, MAX) where:
tOFF
tON
K
OFF / (VOUT - VBATT) and
K
ON / VBATT with
KOFF = 1.1Vµs and
KON = 3.3Vµs.
Rev:001 Date:11/20/03 SP6649 Ultra-low Quiescent Current, High Efficiency Boost DC-DC Regulator
© Copyright 2002 Sipex Corporation
4
At light loads (plot A in Figure 3) the charge
cycle will take tON, MAX µs. For a 1V battery this
would be:
Inductor Current vs. Load
llim
Ton Max.
Toff Min.
tON, MAX = KON / VBATT = 3.3Vµs / 1V = 3.3µs
E. Iripple=Toff* (Vo - Vi)/L
llim
llim
llim
llim
Ton Max.
The current built up in the coil during the charge
cycle gets fully discharged (discontinuous con-
duction mode, DCM) When the current in the
coil has reached zero the synchronous rectifier
switch is opened and the voltage across the coil
(from VBATT to LX) is shorted internally to
eliminate inductive ringing.
Toff Min.
D. Toff*= (Vo - Vi)/L<Iripple<Ton*Vi/L
Ton Max. Toff Min.
C. Iripple=Ton*Vi/L
B. Iripple=Ton*Vi/L
A. Iripple=Ton*Vi/L
Ton Max.
Toff Min.
With increasing load (plot B in Figure 3) this
inductor damping time becomes shorter (be-
cause the output will drop quicker below its
regulation point due to the heavier load) up to
the point where it becomes zero. If the load
increases further the SP6649 enters continuous
conduction mode (CCM) where there is always
current in the inductor. The charge time is still
tON,MAX as long as the inductor peak current
limit is not reached (plot C in Figure 3). the
inductor peak current limit can be programmed
by trying a resistor RLIM from the RLIM pin to
ground where:
Ton Max. Toff Min.
Figure 3. Inductor Current vs. Load
In (plot D of Figure 3) the current reaches the
peak current limit during the charge cycle but
full load is still not reached becuse at the end of
the minimum off-time VOUT was still not below
its regulation point. Finally in plot E the maxi-
mum load is reached where the discharge time
has shrunk to its minimum allowed value
IPEAK = 1400 / RLIM
tOFF,MIN
.
with a maximum recommended IPEAK of 1.2A
(or a minimum RLIM of 1.17K ).
When the peak current limit is reached the
charge time is short-cycled.
Rev:001 Date:11/20/03
SP6649 Ultra-low Quiescent Current, High Efficiency Boost DC-DC Regulator
© Copyright 2002 Sipex Corporation
5
PERFORMANCE CHARACTERISTICS
3.3V out, refer to the Circuit in Figure 1, TAMB=+25°C.
100
95
3.400
3.380
3.360
3.340
3.320
3.300
3.280
3.260
3.240
3.220
3.200
90
Vi=3.0V
Vi=2.6V
Vi=2.0V
Vi=1.3V
Vi=1.0V
85
Vi=3.0V
Vi=2.6V
80
Vi=2.0V
Vi=1.3V
Vi=1.0V
75
70
65
60
0.1
1.0
10.0
100.0
1000.0
0
100
200
300
400
500
ILOAD(mA)
Iload (mA)
Figure 5. Line/Load Rejection vs. Load Current
Figure 4. Efficiency vs. Load Current
100
80
60
40
20
0
400
350
300
250
200
150
100
50
0
1.0
1.5
2.0
2.5
3.0
1.0
1.5
2.0
2.5
3.0
Vin (V)
Vin (V)
Figure 6. No Load Battery Current
Figure 7. Maximum Resistive Load Current in Startup
Figure 9. Output Ripple, VIN=2.6V, ILOAD=200mA
Figure 8. Output Ripple, VIN=2.6V, ILOAD=80mA
Rev:001 Date:11/20/03 SP6649 Ultra-low Quiescent Current, High Efficiency Boost DC-DC Regulator
© Copyright 2002 Sipex Corporation
6
PERFORMANCE CHARACTERISTICS
5V out, refer to the Circuit in Figure 1, TAMB=+25°C, R1=374K.
100
95
90
85
80
75
70
65
60
5.100
5.080
5.060
5.040
5.020
5.000
4.980
4.960
4.940
4.920
4.900
Vi=4.2V
Vi=3.2V
Vi=2.6V
Vi=2.0V
Vi=1.6V
Vi=4.2V
Vi=3.2V
Vi=2.6V
Vi=2.0V
Vi=1.6V
0
100
200
300
400
500
0.1
1.0
10.0
100.0
1000.0
Iload (mA)
Iload (mA)
Figure 10. SP6649 5V Efficiency vs. Load Current
Figure 11. SP6649 5V Line/Load Rejection vs. Load
Current
300
250
200
150
100
50
500
450
400
350
300
250
200
150
100
50
0
0
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
Vin (V)
Vin (V)
Figure 12. SP6649 5V No Load Battery Current
Figure 13. SP6649 5V Maximum Resistive Load Current
in Startup
Figure 14. SP6649 5V Output Ripple, Vin=2.6V,
Iload=80mA
Figure 15. SP6649 5V Output Ripple, Vin=2.6V,
Iload=200mA
Rev:001 Date:11/20/03
SP6649 Ultra-low Quiescent Current, High Efficiency Boost DC-DC Regulator
© Copyright 2002 Sipex Corporation
7
PACKAGE:
10-PIN MSOP
(ALL DIMENSIONS IN MILLIMETERS)
D
e1
Ø1
E/2
R1
R
E1
E
Gauge Plane
L2
Ø
Ø1
Seating Plane
L
L1
1
2
e
Pin #1 indentifier must be indicated within this shaded area (D/2 * E1/2)
10-PIN MSOP
JEDEC MO-187
(BA) Variation
Dimensions in (mm)
MIN NOM MAX
A
-
-
1.1
0
-
0.15
A1
A2
0.75 0.85 0.95
b
0.17
0.08
-
0.27
0.23
(b)
c
-
WITH PLATING
D
E
3.00 BSC
4.90 BSC
3.00 BSC
0.50 BSC
2.00 BSC
0.60
E1
c
e
e1
L
0.4
-
0.80
BASE METAL
L1
L2
N
-
0.95
0.25
-
-
D
b
-
10
-
R
0.07
0.07
0º
-
-
-
A2
R1
Ø
-
A
8º
Ø1
0º
-
15º
A1
Rev:001 Date:11/20/03 SP6649 Ultra-low Quiescent Current, High Efficiency Boost DC-DC Regulator
© Copyright 2002 Sipex Corporation
8
ORDERING INFORMATION
Operating Temperature Range
Part Number
Package Type
SP6649EU .................................................. -40°C to +85°C ........................................................ 10 Pin MSOP
SP6649EU/TR ............................................ -40°C to +85°C ................................ (Tape & Reel) 10 Pin MSOP
Corporation
SIGNALPROCESSINGEXCELLENCE
Sipex Corporation
Headquarters and
Sales Office
233 South Hillview Drive
Milpitas, CA 95035
TEL: (408) 934-7500
FAX: (408) 935-7600
Sales Office
22 Linnell Circle
Billerica, MA 01821
TEL: (978) 667-8700
FAX: (978) 670-9001
e-mail: sales@sipex.com
Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the
application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others.
Rev:001 Date:11/20/03
SP6649 Ultra-low Quiescent Current, High Efficiency Boost DC-DC Regulator
© Copyright 2002 Sipex Corporation
9
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