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Details, datasheet, quote on part number:SP6655
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| Part: | SP6655 |
| Category: | Power Management => Regulators => Buck Regulators |
| Description: | Iout = 400mA ;; Min. = 2.6V ;; Max. = 5.5V ;; Iq = 20µA ;; Fixed Outputs = N/a ;; Output Range = 1.0 to VCC ;; Freq. (kHz) = PFM ;; Efficiency = 98% ;; Package = 10 Pin DFN |
| Company: | Sipex Corporation |
| Datasheet: | Download SP6655 datasheet File size : 157 kB |
| Request For quote: | Find where to buy SP6655
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Datasheet text preview:
®
SP6655
Ideal for portable designs powered with Li Ion battery
High Efficiency 400mA Synchronous Buck Regulator
FEATURES 98% Efficiency Possible Small 10-Pin DFN Package Ultra-low 20µA Quiescent Current 625mA Inductor Peak Current Limit Guaranteed Minimum 400mA Output Current 2.7V to 5.5V Input Voltage Range Output Adjustable Down to 1.0V 100% Duty Ratio Low Dropout Operation 80µA Light Load Quiescent Current in Dropout
PVIN 1 VIN 2 BLON 3 D1 4 D0 5
10 LX
SP6655
10 Pin DFN
9 PGND 8 GND 7 VOUT 6 FB
APPLICATIONS Cell Phones PDA's DSC's MP3 Players USB Devices Point of Use Power
DESCRIPTION The SP6655 is a 400mA synchronous buck regulator which is ideal for portable applications that use a Li-Ion or 3 cell alkaline/NiCD/NiMH input. The SP6655's proprietary control loop, 20µA light load quiescent current, and 0.3 power switches provide excellent efficiency across a wide range of output currents. As the input battery supply decreases towards the output voltage the SP6655 seamlessly transitions into 100% duty ratio operation further extending useful battery life. The SP6655 is protected against overload and short circuit conditions with a precise inductor peak current limit. Other features include programmable under voltage lockout and low battery detection, externally programmed output voltage down to 1.0V, logic level shutdown control, and 140°C over temperature shutdown. TYPICAL APPLICATION SCHEMATIC
2.7V to 5.5V Input
100
VI
L1 10µH 10 RVIN CVIN 1µF
VOUT 400mA
VO
CIN
95 90
Efficiency (%)
SP6655
PVIN VIN BLON LX PGND GND
10µF 1M
CO U T 10µF CF RF
22pF
85
BLON
80 75 0.1 1.0 10.0 ILoad (mA) 100.0 1000.0
D1 D0
D1 D0
VOUT FB RI 200K
Efficiency vs. Load, VOUT=3.3V, VIN=3.6V
Rev. 6/17/03 SP6655 High Efficiency 400mA Synchronous Buck Regulator © Copyright 2003 Sipex Corporation
1
ABSOLUTE MAXIMUM RATINGS
PVIN,VIN .... 6V All other pins ..... -0.3V to VIN+0.3V PVIN, PGND, LX current ...... 2A Storage Temperature ........ -65 °C to 150 °C Operating Temperature ....... -40°C to +85°C Lead Temperature (Soldering, 10 sec) ...... 300 °C 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.
ELECTRICAL SPECIFICATIONS
VIN=UVIN=VSDN=3.6V, VOUT=VFB, IO = 0mA, TAMB = -40°C to +85°C, typical values at 27°C unless otherwise noted. PARAMETER Input Voltage Operating Range Minimum Output Voltage FB Set Voltage, Vr Overall Accuracy (-40°C to 85°C) (0°C to 70°C) On-Time Constant - KON Min, TON=KON/(VIN-VOUT) Off-Time Constant - KOFF Min, TOFF=KOFF/VOUT Off-Time Blanking PMOS Switch Resistance NMOS Switch Resistance Inductor Current Limit Power Efficiency Minimum Guaranteed Load Current VIN Quiescent Current VIN Shutdown Current VOUT Quiescent Current VOUT Shutdown Current UVLO Undervoltage Lockout Threshold, VIN falling UVLO hysteresis Battlo Trip Voltage, VIN falling Battlo Trip Voltage Hysteresis BLON Low Output Voltage BLON Leakage Current Over-Temperature Rising Trip Point Over-Temperature Hysteresis D1,D0 Leakage Current D1,D0 Input Threshold Voltage FB Leakage Current LX Leakage MIN UVLO 1.0 0.784 TYP MAX 5.5 UNITS V V V CONDITIONS Result of IQ measurement at VIN=PVIN=5.5V
0.800
0.816
1.5 1.6
2.25 2.4 100 0.3 0.3 625 96 92 500 20 1 2 1 2.70 2.85 3.00 40 300 9
±5 ±4 3.0 3.2
% V*µs V*µs ns mA % mA
25°C, IO=200mA Close Loop. LI = 10µH, COUT = 22µF Measured at VIN=5.5V, no load and VIN=3.6V, 200mA load, Close Loop Close Loop, LI = 10µH,COUT = 22µF Inductor current limit tripped, VFB=0.5V Measured at VOUT=1V IPMOS = 200mA INMOS = 200mA VFB=0.5V VOUT=2.5V, IO=200mA VOUT=3.3V, IO=400mA
500
0.6 0.6 750
400
2.55 2.70 2.85 265
30 500 5 500 2.85 3.00 3.15 335 0.4 1
µA nA µA nA V mV mV mV V µA °C °C nA V V nA µA
VOUT=3.3V, VIN=3.6V and VIN= 5.5V D1=D0=0V VOUT = 3.3V D1=D0=0V D1=0V, D0=VIN D1=VIN, D0=0V D1=VIN, D0=VIN Measured as VIN-VOUT VIN=3.3V, ISINK=1mA VBLON=3.6V
140 14 1 0.90 1.25 1 3
500 1.8 100 5
0.60
High to Low Transition Low to High Transition FB=1V D1,D0=0V, VIN=3.6V LX=0V,LX=VIN+0.2V
Rev. 6/17/03
SP6655 High Efficiency 400mA Synchronous Buck Regulator
© Copyright 2003 Sipex Corporation
2
PIN DESCRIPTION
PIN NUMBER 1 2 3 4 5 6 PIN NAME P VIN VI N BLON D1 D0 FB DESCRIPTION Input voltage power pin. Inductor charging current passes through this pin. Internal supply voltage. Control circuitry powered from this pin. Open drain battery low output. (VIN-VO) less than 300mV pulls this node to ground. (VIN-VO) above threshold, this node is open. Digital mode control input. See table I for definition. Digital mode control input. See table I for definition. External feedback network input connection. Connect a resistor from FB to ground and FB to VOUT to set the output voltage. This pin regulates to the internal bandgap reference voltage of 0.8V. Output voltage sense pin. Used by the timing circuit to set minimum on and off times. Internal ground pin. Control circuitry returns current to this pin. Power ground pin. Synchronous rectifier current returns through this pin. Inductor switching node. Inductor tied between this pin and the output capacitor to create regulated output voltage.
7 8 9 10
VOUT GND PG N D LX
D1 0 0 1 1
D0 0 1 0 1 Shutdown. All internal circuitry is disabled and the power switches are opened. Device enabled, falling UVLO threshold =2.70V Device enabled, falling UVLO threshold =2.85V Device enabled, falling UVLO threshold =3.00V
Table 1. Operating Mode Definition
FUNCTIONAL DIAGRAM
VIN
DRVON VOLOW TONOVER MIN Ton Internal Supply TONOVER Vos VOLOW REF + -REF' + VRAMP Min Ton Min TON = KON/(VIN -VOUT) M DRVON
R S Q
VOUT
PVIN
1
OVR_I
+
DRIVER
-
C
ILIM/M
_
Q
-
C
FB
+
- FB'
OVR_I
RST DRVON REF Ref Block
UVLO TSD
LX
D0 D1
+
One-Shot =100ns BLANK
-
C
Zero_X
PGND
TOFF = KOFF/VOUT
ILIM/M
OVR_I
300mV
GND
VOUT VIN
-
+
+ C
BLON
DRVON BLANK BLANK = TBLANK(=100ns) or TOFF = KOFF/VOUT
UVLO
Rev. 6/17/03
SP6655 High Efficiency 400mA Synchronous Buck Regulator
© Copyright 2003 Sipex Corporation
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