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SIP1759
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Buck-Boost Regulator
FEATURES
D Output Voltage--Fixed 3.3 V or Adjustable from 2.5 V to 5.5 V D 1.6-V to 5.5-V Input Voltage Range D 100-mA Output Current D 60-mA Quiescent Current D Shutdown Current <1 mA D Short Circuit Protection D Thermal Shutdown D MSOP-10 Package
APPLICATIONS
D D D D 1-Cell Li Ion Battery Powered Equipment 2- to 3-Cell NiMH Battery Powered Equipment 2- to 3-Cell Alkaline Battery Powered Equipment Backup Battery Boost Converters
DESCRIPTION
The SIP1759 is a buck-boost regulating charge pump. It is designed to provide a regulated output from 1-cell Li Ion or 2/3-cell NiMH voltages found in handheld portable equipment, 1.6 V to 5.5 V. SIP1759 allows the option of a fixed 3.3-V output voltage, or an adjustable output which can be set from 2.5 V to 5.5 V. The output current is up to 100 mA. For flexibility in application, SIP1759 has a shutdown pin (SD) and an ERROR output to indicate when the output voltage is in regulation. SIP1759 is available in a 10-pin MSOP package and is rated over the industrial temperature range of -40 to 85 _C.
TYPICAL APPLICATION CIRCUIT
CX
CX
CX- VIN CiN
CX+ VOUT VIN
CX- PGND
CX+ VOUT
SIP1759
SD GND PGND ERROR FB
R
COUT
CiN
SIP1759
SD GND PGND ERROR FB
R
R1
COUT
R2
Fixed Output
Adjustable Output
Document Number: 72949 S-40643--Rev. A, 12-Apr-04
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SIP1759
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ABSOLUTE MAXIMUM RATINGS (ALL VOLTAGES REFERENCED TO GND = 0 V)
Input Voltage (VIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to6 V OUT SD, FB, ERROR to GND . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 V to 6 V CX- to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 V to (VIN + 0.3 V) CX+ to GND . . . . . . . . . . . . . . . -0.3 V to (the greater of VIN or VOUT) + 1 V) Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to 150_C Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150_C Power Dissipationa,b MSOP-10 (TA = 70 _C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 444 mW Notes a. Device mounted with all leads soldered or welded to PC board. b. Derate 5.6 mW/_C above 70 _C.
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
RECOMMENDED OPERATING RANGE (ALL VOLTAGES REFERENCED TO GND = 0 V)
Input Voltage Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.6 V to 5.5 V Output Voltage Adjustment Range . . . . . . . . . . . . . . . . . . . . . . . 2.5 V to 5.5 V CIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 mF CX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.33 mF COUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 mF Operating Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . -40 to 85_C
SPECIFICATIONS
Test Condition Unless Specified Parameter
Input Voltage Range Input Undervoltage Lockout Output Voltage Adjustment Range
Limits -40 to 85_C Tempa
Full Full
Symbol
VIN VUVLO
VIN = VSD = 2 V, FB = PGND = GND CIN = 10 mF, Cx = 0.33 mF, COUT = 10 mF
Min
1.6 0.7 2.5 3.17 3.17 3.15 3.15 100
Typb
Max
5.5
Unit
1.0
1.5 5.5
1.6 V v VIN v 5.5 V 2 V v VIN v 5.5 V, 1 mA v IOUT v 50 mA
Full 0 to 85_C Full Full 0 to 85_C Full Full Full Full Full Full Full Full Full Full Full Full Full Full Full
3.3 3.3
3.43 3.43 3.45 3.45
V
Output Voltage
VOUT
2.5 V v VIN v 5.5 V, 1 mA v IOUT v 100 mA 2 V v VIN v 5.5 V, 1mA v IOUT v 50 mA 2.5 V v VIN v 5.5 V, 1mA v IOUT v 100 mA 2.5 V v VIN v 5.5 V IOUT v 100 mA (RMS) VIN = VSD = 4 V, VFB = 0 V, Stepping Down VIN = VSD = 2 V, VFB = 0 V, Stepping Up 1.6 V v VIN v 5.5 V, VSD = 0 V VIN = 2 V, VOUT = 3.3 V, VSD = 0 V 1.6 1 6 V v VIN 5 5 V 5.5 VSD = 5.5 V
Maximum Output Current Transient Load Current Quiescent Supply Current Shutdown Supply Current Output Leakage Current in Shutdown SD Logic Input Voltage SD Input Leakage Current FB Regulation Voltage FB Input Current FB Dual Mode Threshold ERROR Trip Voltage ERROR Output Low Voltage ERROR Leakage Current Switching Frequency Output Short-Circuit Current
IOUT(max)
200 60 60 1 1 100 100 5 5 0.25*VIN 0.7*VIN -1 1.205 1.235 25 100 200 1.0 100 1.1 5 0.01 1.2 1.5 110 1.2 100 0.2 1.8 1 1.265 200 50
mA
IQ IQSD SD VIL VIH VFB IIFB
mA
V mA V nA mV V mV mA MHz mA
VIN = 1.65 V, VOUT = 3.3 V VFB = 1.27 V Internal Feedback External Feedback Falling Edge at FB
VOL fOSC
IOL = 0.5 mA, VIN = 2 V VERROR = 5.5 V, VFB = 1.27 V 1.6 V v VIN v 5.5 V, VFB = 1 V VOUT = 0 V, 2.5 V v VIN v 5.5 V Foldback Current Limit
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Document Number: 72949 S-40643--Rev. A, 12-Apr-04
SIP1759
New Product
SPECIFICATIONS
Test Condition Unless Specified Parameter
Thermal Shutdown Temperature Thermal Shutdown Hysteresis Efficiency VIN = 3.6 V, IOUT = 10 mA
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Limits -40 to 85_C Tempa
Full Full Full
Symbol
VIN = VSD = 2 V, FB = PGND = GND CIN = 10 mF, Cx = 0.33 mF, COUT = 10 mF
Min
Typb
160 20 90
Max
Unit
Temperature Rising
_C C %
Notes a. Full = as determined by the operating suffix. b. Typical values are for Design Aid only, not guaranteed nor subject to production testing.
PIN CONFIGURATION AND TRUTH TABLE
MSOP-10
ERROR SD VIN VIN GND
1 2 3 4 5 10 9 8 7 6
FB VOUT CX+ CX- PGND
ORDERING INFORMATION
Part Number
SIP1759DH-T1
Temperature Range
-40 to 85_C
Marking
1759
Eval Kit
SIP1759DB
Temperature Range
-40 to 85_C
Board
Surface Mount
Top View
PIN DESCRIPTION
Pin Number
1 2 3, 4 5 6 7 8 9 10
Name
ERROR SD VIN GND PGND CX- CX+ VOUT FB Shutdown Input Input Voltage Ground Power Ground Negative Terminal of the Charge Pump Capacitor Positive Terminal of the Charge Pump Capacitor Regulated Output Voltage
Function
Open Drain Error Flag--A low output indicates that the output voltage is out of range.
Feedback Input--Connected to GND for fixed 3.3-V output. Connected to a resistive divider for an adjustable output.
Document Number: 72949 S-40643--Rev. A, 12-Apr-04
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SIP1759
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FUNCTIONAL BLOCK DIAGRAM
VIN CX- CX+
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PGND Control VOUT
SD
Bias
Oscillator
+ - + -
ERROR + -
FB + -
GND
+ -
+ -
DETAILED OPERATION
The SIP1759 is a buck-boost regulating charge pump. This allows for the VIN to be at a higher or lower voltage than the regulated output. This is done with a charge pump that when VIN is lower than VOUT is a regulated voltage doubler. When VIN is higher than VOUT the charge pump is a step down gated switch. In boost mode, the IC controls the transfer capacitor through CX+ and CX- pins, switching the charge to the output keeping it regulated. In this mode the charge pump only switches to maintain regulation, the output ripple does not increase with light loads. In buck mode, the CX- pin is internally connected to PGND and the CX+ is switched internally between VIN and Unless VIN is significantly larger than VOUT VOUT. (VIN w VOUT + 1 V) , in heavy load the IS will slip from buck mode to boost mode as necessary to charge the transfer capacitor. Shutdown Mode The IC is designed to conserve power by decreasing current consumption during normal operation as well as shutdown mode. Pulling the SD pin logic low, the output is disconnected from the input and is in high impedance; the internal circuitry of the oscillator, control logic, and the charge-pump switches are turned off, decreasing the current consumption to less than 1 mA. Undervoltage Lockout When VIN falls below 1V the Undervoltage Lockout disables the SIP1759.
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Power OK Output POK is an open-drain output that goes low when the regulator feedback voltage falls below 1.1 V. A 10-kW to 1-MW pull-up resistor from POK to OUT should be used to provide a logic output and keep current consumption to a minimum. Connect POK to GND or leave floating if not used. The POK output is high impedance when the IC is in shutdown mode. Fixed Output The SIP1759 can be configured as a fixed 3.3-V output regulator or as an adjustable output from 2.5 V to 5.5 V. In the Fixed 3.3-V output mode the feedback voltage is generated from the internal resistor-divider network. The FB pin must be tied to GND. Soft-Start and Short Circuit Protection The IC features a soft-start mechanism that limits the inrush current during start-up and if the output is short circuited the SIP1759 will limit the output current to 110 mA. Thermal Shutdown The SIP1759 is designed with a thermal shutdown circuit that will shut down the IC when the die temperature exceeds 160_C. The thermal shutdown has 20_C of hysteresis, insuring when the die cools down the IC will turn on again.
Document Number: 72949 S-40643--Rev. A, 12-Apr-04
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SIP1759
New Product
DESIGN CONSIDERATIONS
Setting the Adjustable Output Voltage The SIP1759 regulated output can be adjusted from 2.5 V to 5.5 V via resistor divider network from VOUT to GND (See Typical Application Circuits). R1 and R2 should be kept in the 50-kW to 100-kW range for low power consumption, while maintaining adequate noise immunity. The value R1 is calculated using the following formula: R1=R2{(VOUT/VFB)-1} VFB is nominally 1.235V. Capacitor Selection Capacitor selection for CIN, COUT and CX will have an impact on the voltage output ripple, output current and overall physical size of the circuit. Ceramic capacitors are recommenced for their low ESR which will help keep the output voltage ripple at a minimum. The initial values for the CIN and COUT capacitors should be 10 mF, the CX capacitor should be 0.33 mF. Output Ripple The SIP1759 automatically decides whether to be in step up mode or step down mode depending on the VIN, VOUT and current load conditions, therefore the voltage output ripple will vary. In step-up mode the voltage output ripple is higher than step-down mode. But unless VIN is significant larger than VOUT (VIN w VOUT + 1 V) , in heavy load the IC will slip from buck mode to boost mode as necessary to charge the transfer capacitor and the ripple will increase. Reducing the CX capacitor value will cause an increase in the switching frequency and a reduction of the output ripple.
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TYPICAL CHARACTERISTICS
120 100 80 60 40 20 0 1.5
Efficiency vs. Input Voltage
1.00E-01 IOUT @ 10 mA IOUT @ 100 mA Quiescent Current (A) IOUT @ 50 mA 1.00E-02 1.00E-03 1.00E-04 1.00E-05 1.00E-06
Quiescent Current vs. Input Voltage (No Load)
Efficiency (%)
1.00E-07 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 0.5 1.5 Input Voltage (V) 2.5 3.5 Input Voltage (V) 4.5 5.5
4.0 3.5 Output Voltage (V) 3.0 2.5 2.0 1.5 1.0 0.5 0.0 0.5
Start-Up Input Voltage
(VOUT < VIN) RLOAD = 33 W
0.20 Output Ripple Voltage (V)
Output voltage Ripple vs. Input Voltage
0.16
100 mA
0.12
0.08
50 mA
0.04 10 mA 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 0.00 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
Input Voltage (V)
Input Voltage (V)
Document Number: 72949 S-40643--Rev. A, 12-Apr-04
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SIP1759
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TYPICAL WAVEFORMS
Figure 1. Typical Switching Waveform (VOUT > VIN)
VOUT 50 mV/div
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Figure 2.
Typical Switching Waveforms (VOUT > VIN)
VOUT 50 mV/div
VC+ 5 V/div
VC+ 5 V/div
VIN 50 mV/div
VIN 50 mV/div
5 ms/div VIN = 2.5 V VOUT = 3.3 V RLOAD = 33 W
5 ms/div VIN = 4.2 V VOUT = 3.3 V RLOAD = 33 W
Figure 3.
Load Transient Response (VOUT > VIN)
Figure 4.
Load Transient Response (VOUT < VIN)
VOUT 50 mV/div
VOUT 50 mV/div
IOUT 100 mA/div 100 ms/div VIN = 2.5 V VOUT = 3.3 V IOUT Step: 10 mA - 100 mA 100 ms/div VIN = 4.2 V VOUT = 3.3 V IOUT Step: 10 mA - 100 mA
IOUT 100 mA/div
Figure 5.
Turn On/Off Response (VIN = 2.5 V)
Figure 6.
Turn On/Off Response (VIN = 4.2 V)
VOUT 1 V/div IIN 200 mA /div VERROR 5 V /div VSD 2 V/div 0.5 ms/div VIN = 2.5 V VOUT = 3.3 V 0.5 ms/div VIN = 4.2 V VOUT = 3.3 V
VOUT 1 V/div IIN 200 mA /div VERROR 5 V /div VSD 2 V/div
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Document Number: 72949 S-40643--Rev. A, 12-Apr-04

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