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Step-Down DC/DC Controller
Target Datasheet Features • • • • • • • • • • • • Operation from 5V to 60V Input Voltage 100% Maximum Duty Cycle Efficiency >90% Output Current up to 3A Less than 100µA Quiescent Current 2µA Max Shutdown Current Up to 350kHz Switching Frequency Adjustable and Fixed 5V and VIN 3.3V Output Voltage versions 3% output voltage accuracy (PWM Mode) Current-Mode Control Scheme On Chip Low Battery Detector Ambient operation range -40°C to 125°C R =
SI1
TLE 6389
P-DSO-14-3, -4, -9, -11
RSENSE= 0.05
M1
L1 = 47 µH
VOUT IOUT
CIN1 = 100 µF
CBDS= 220 nF
11 13 BDS VS 7 SI CS 14 12 GDRV 2
RSI2=
Type TLE 6389 GV TLE 6389 G50 TLE 6389 G50-1 TLE 6389 G33 TLE 6389 G33-1
Ordering Code on request on request on request on request on request
Package P-DSO-14 P-DSO-14 P-DSO-14 P-DSO-14 P-DSO-14
Functional description The TLE6389 step-down DC-DC switching controllers provide high efficiency over loads ranging from 1mA up to 3A. A unique PWM/PFM control scheme operates with up to a 100% duty cycle, resulting in very low dropout voltage. This control scheme eliminates minimum load requirements and reduces the supply current under light loads to 100µA. These step-down controllers drive an external P-channel MOSFET, allowing design flexibility for applications up to 3A. A high switching frequency (up to 350kHz) and
Target Datasheet Rev. 1.7 1 2001-09-17
100k
400k
CIN2 = 220nF
TLE6389G50-1
SYNC GND 5 4 6 ON 1 OFF
SI_GND SI_ENABLE
D1
100 µF
COUT =
3 FB VOUT 9 SO 10 RO RD 8
M1: Infineon SPD09P06PL D1: Motorola MBRD360 L1: Coilcraft DO3340P-473 Cin1: TBD Cout: Low ESR Tantalum
CRD =100nF
Description adjustable 5V, Device Enable 5V, SI GND, SI Enable 3.3V, Device Enable 3.3V, SI GND, SI Enable
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TLE 6389
operation in continuous-conduction mode allow the use of tiny surface-mount inductors. Output capacitor requirements are also reduced, minimizing PC board area and system costs. The output voltage is preset at 5V (TLE6389-50) or 3.3V (TLE6389-33) and adjustable for the TLE6389. Input voltages can be up to 60V.
Pin Configuration (top view)
ENABLE / 1 SI_EN FB 2 VOUT 3 GND 4 SYNC 5 SI_GND 6 SI 7 14 CS 13 VS 12 GDRV
P-D-SO-14
11 BDS 10 RO 9 SO 8 RD
Pin Definitions and Functions
Pin No SO-14 2 Symbol FB Function Feedback Input. 1. For adjustable-output operation connect to an external voltage divider between the output and GND (see the Setting the Output Voltage section). 2. Sense input for fixed 5V or 3.3V output operation. FB is internally connected to an on-chip voltage divider. VOUT Input. Input for internal supply. Connect to output if variable version is used. For fixed voltage version connect FB and VOUT.
3
VOUT
1
ENABLE Active-Low Enable Input. Device is placed in shutdown when Enable is driven low. In shutdown mode, the reference, output, and external MOSFET are turned off. Connect to logic high for normal operation. (TLE6389G50, TLE6389G33, TLE6389GV only)
Target Datasheet Rev. 1.7
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2001-09-17
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TLE 6389
Pin No SO-14 1
Symbol SI_ENA BLE
Function SI Enable Input. SI_GND is switched to high impedance when SI_Enable is low. High level at SI_Enable connects SI_GND to GND via a low impedance path. SO is undefined when SI_Enable is low. (TLE6389G501, TLE6389G33-1 only) Supply Input. Bypass with 0.47µF. Ground. Analog signal ground. SI Ground. Ground connection for SI comparator resistor devider. Buck Driver Supply Input. Connect ceramic capacitor between BDS and VS to generate clamped gate-source voltage to drive the PMOS power stage. Current-Sense Input. Connect current-sense resistor between VS and CS. External MOSFET is turned off when the voltage across the resistor equals the current-limit trip level. Gate Drive Output for External P-Channel MOSFET. GDRV swings between VS and BDS. Reset Output. Open drain output from reset comparator with an internal pull up resistor. Reset Delay. Connect a capacitor to ground for delay time adjustment. Sense Output Comparator. Open drain output from SI comparator with an internal pull up resistor. Sense Input Comparator. Input to the Low-Battery Comparator. This input is compared to an internal 1.25V reference. Input for external synchronization. An external clock signal connected to this pin allows for GDRV switching synchronization.
13 4 6 11
VS GND SI_GND BDS
14
CS
12 10 8 9 7 5
GDRV RO RD SO SI SYNC
Target Datasheet Rev. 1.7
3
2001-09-17
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TLE 6389
1 Item
Absolute Maximum Ratings Parameter Supply Input Symbol Limit Values Unit min. max. 60 – 60 – 6.8 – 55 – 6.8 – 6.8 Remarks
1.0.1 1.0.2 1.0.3 1.0.4 1.0.5 1.0.6 1.0.7 1.0.8 1.0.9 1.0.10 1.0.11
Voltage Current Current Sense Input Voltage Current Gate Drive Output Voltage Current Voltage Current Feedback Input Voltage Current SI_Enable Input Voltage
VS IS VCS ICS
VGDRV
-0.3 – -0.3 – – 0.3 – – 0.3 – – 0.3 –
V
–
–
V
– V – V – V – V
–
|VS – VGDRV|<6.8V Internally limited |VS – VBDS|<6.8V
IGDRV
VBDS
Buck Drive Supply Input
IBDS
VFB
IFB
VSI_ENAB – 0.3
LE
(TLE6389G50-1, TLE6389G33-1 only)
1.0.12
Current SI_GND Input
ISI_ENABL –
E
–
–
1.0.13
Voltage
VSI_GND
– 0.3
60
V
(TLE6389G50-1, TLE6389G33-1 only)
1.0.14
Current
ISI_GND
–
–
–
Enable Input
Target Datasheet Rev. 1.7
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2001-09-17
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TLE 6389
1 Item 1.0.15
Absolute Maximum Ratings (cont’d) Parameter Voltage Symbol VENABLE Limit Values Unit min. – 0.3 max. 60 V
(TLE6389G50, TLE6389G33, TLE6389GV only)
Remarks
1.0.16 1.0.17 1.0.18 1.0.19 1.0.20 1.0.21 1.0.22 1.0.23 1.0.24 1.0.25 1.0.26 1.0.27 1.0.28
Current Sense Input Voltage Current Sense Output Voltage Current VOUT Input Voltage Current Voltage Current Reset Output Voltage Current Synchronization Input Voltage Current
IENABLE
VSI
– – 0.3 – – 0.3 – – 0.3 – – 0.3 TBD – 0.3 -2 – 0.3 TBD
– 60 – 6.8 – 15 – 6.8 TBD 6.8 2 6.8 TBD
– V – V – V – V mA V mA V mA
ISI
VSO
ISO
VOUT
IOUT
VRD
Reset Delay Adjust Input
IRD
VRO
IRO
VSYNC
ISYNC
ESD-Protection (Human Body Model; R=1,5kΩ; C=100pF) 1.0.29 all pins to GND
VHBM
–2
2
kV
Target Datasheet Rev. 1.7
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TLE 6389
1 Item
Absolute Maximum Ratings (cont’d) Parameter Symbol Limit Values Unit min. Temperatures max. Remarks
1.0.30 1.0.31
Junction temperature Storage temperature
Tj Tstg
– 40 – 50
150 150
°C °C
– –
Note: Maximum ratings are absolute ratings; exceeding any one of these values may cause irreversible damage to the integrated circuit.
Target Datasheet Rev. 1.7
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2001-09-17
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TLE 6389
2 Item 2.0.1 2.0.2
Operating Range Parameter Supply voltage range Junction temperature Thermal Resistance Symbol VS Limit Values min. 5 – 40 max. 48 150 V °C Unit Remarks
Tj
2.0.3 2.0.4
Junction ambient Junction pin
Rthj-a Rthj-p
180 TBD
K/W K/W
– –
3
Electrical Characteristics
5V< VS <48V; - 40°C< Tj <150°C;
all voltages with respect to ground; positive current defined flowing into the pin; unless otherwise specified
Item
Parameter
Symbol
Limit Values min. typ. max.
Unit Test Condition
Current Consumption1) TLE6389 (variable) 3.0.1 Supply current into VS IS 80 µA
VS = 13.5 V; VENABLE = 5 V;
IOUT = 0 mA; TJ = 25 °C;
3.0.2
110
µA
VS = 42 V; VENABLE = 5 V;
IOUT = 0 mA; TJ = 25 °C;
3.0.3 3.0.4 FB current IFB
2 4
µA µA
VENABLE=0V
VENABLE = 5 V;
TJ = 25 °C;
Target Datasheet Rev. 1.7
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2001-09-17
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TLE 6389
3
Electrical Characteristics (cont’d)
5V< VS <48V; - 40°C< Tj <150°C;
all voltages with respect to ground; positive current defined flowing into the pin; unless otherwise specified
Item
Parameter
Symbol
Limit Values min. typ. max.
Unit Test Condition
Current Consumption TLE6389-50 3.0.5 Supply current into VS IS 50 µA
VS = 13.5 V; VENABLE = 5 V;
IOUT = 0 mA; TJ = 25 °C;
3.0.6
80
µA
VS = 42 V; VENABLE = 5 V;
IOUT = 0 mA; TJ = 25 °C;
3.0.7 3.0.8 FB current IFB
2 50
µA µA
VENABLE=0V
VENABLE = 5 V; VOUT = 5 V;
TJ = 25 °C;
Current Consumption TLE6389-33 3.0.9 Supply current into VS IS 80 µA
VS = 13.5 V; VENABLE = 5 V;
IOUT = 0 mA; TJ = 25 °C;
3.0.10
110
µA
VS = 42 V; VENABLE = 5 V;
IOUT = 0 mA; TJ = 25 °C;
3.0.11
2
µA
VENABLE=0V
Current Consumption TLE6389-50-1
Target Datasheet Rev. 1.7
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TLE 6389
3
Electrical Characteristics (cont’d)
5V< VS <48V; - 40°C< Tj <150°C;
all voltages with respect to ground; positive current defined flowing into the pin; unless otherwise specified
Item
Parameter
Symbol IS
Limit Values min. typ. max. 50
Unit Test Condition µA
3.0.12 Supply current into VS 3.0.13
VS = 13.5 V;
IOUT = 0 mA; TJ = 25 °C;
80
µA
VS = 42 V;
IOUT = 0 mA; TJ = 25 °C;
3.0.14 FB current
IFB
50
µA
VOUT = 5 V;
TJ = 25 °C;
Current Consumption TLE6389-33-1 3.0.15 Supply current into VS 3.0.16 IS 80 µA
VS = 13.5 V;
IOUT = 0 mA; TJ = 25 °C;
110
µA
VS = 42 V;
IOUT = 0 mA; TJ = 25 °C;
3.0.17 FB current
IFB
15
µA
VOUT = 3.3 V;
TJ = 25 °C;
Buck-Controller 3.0.18 Output voltage VOUT 4.85 5 5.15 V 5V Versions; VS = 5.8 V to 48V; IOUT = TBDmA to 2A (PWM Mode); RSENSE = 0.05Ω; RM1 = 0.25Ω;RL1 = 0.1Ω;
Target Datasheet Rev. 1.7
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2001-09-17
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TLE 6389
3
Electrical Characteristics (cont’d)
5V< VS <48V; - 40°C< Tj <150°C;
all voltages with respect to ground; positive current defined flowing into the pin; unless otherwise specified
Item
Parameter
Symbol VOUT
Limit Values min. typ. max. 5.25 4.75 5
Unit Test Condition V 5V Versions; VS = 5.8 V to 48V; IOUT = 0mA to TBDA (PFM Mode); RSENSE = 0.05Ω; RM1 = 0.25Ω;RL1 = 0.1Ω; 5V Versions; VS = 4.2 V to 5.8V; IOUT = 0mA to 500mA; RSENSE = 0.1Ω; RM1 = 0.4Ω;RL1 = 0.1Ω; 3.3V Versions; VS = 5 V to 48V; IOUT = TBD to 2A (PWM Mode); 3.3
