TPS5602
DUAL, FAST, HIGH EFFICIENCY CONTROLLER FOR DSP POWER
SLVS217 – JUNE 1999
D
D
D
D
D
D
D
D
D
D
D
DBT PACKAGE
(TOP VIEW)
Independent Dual Channels
Hysteretic Control for Fast Transient
Response
4.5-V to 25-V Input Voltage Range
Adjustable Output Voltage Down to 1.2 V
Synchronous Rectifier Enables Efficiencies
of >95%
Minimized External Component Count
Separate Standby Control and Over Current
Protection
Low Supply Current . . . 0.8 mA Typ
30-Pin TSSOP
Low Standby Current (1-µA maximum)
EVM Available (TPS5602EVM-121)
INV1
NC
SOFTSTART1
NC
CT
NC
GND
REF
STBY1
STBY2
VCC
COMP
SOFTSTART2
NC
INV2
description
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
LH1
OUT1_u
LL1
OUT1_d
OUTGND1
TRIP1
VCC SENSE
TRIP2
Vref5
REG5V_IN
OUTGND2
OUT2_d
LL2
OUT2_u
LH2
NC – No internal connection
The TPS5602 is a dual-channel synchronous
buck switch-mode power supply controller
featuring very fast feedback control and minimized component count. By using the hysteretic control method,
it is ideal for high-transient current applications, such as ’C6000 and multiple ’C54x DSPs. The TPS5602 is
designed specifically for DSP applications that require high efficiency. Since both channels are independent,
the up and down power sequencing can be easily achieved by properly setting the standby pins. The wide input
voltage and adjustable output voltage make the TPS5602 suitable for many applications.
typical design
5V
+
C3
D1
GND
R3
R2
C4
L1
C1
OUT1
1.8 V
C7
R5
C2
R6
C8
R1
L2
C5
R4
OUT2
3.3 V
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Copyright 1999, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
1
TPS5602
DUAL, FAST, HIGH EFFICIENCY CONTROLLER FOR DSP POWER
SLVS217 – JUNE 1999
AVAILABLE OPTIONS
PACKAGE
TA
TSSOP
(DBT)
TPS5602IDBT
– 40°C to 85°C
TPS5602IDBTR
EVM
TPS5602EVM 121
TPS5602EVM-121
functional block diagram
SFT1
SOFT START1
LH1
INV1
Hysteretic Comp.
OUT1_u
DLY
LL1
1.185 V
Setup trigger
OUT1_d
DLY
OUTGND1
Current Comp.
TRIP1
OSC on
CT
OSC
VccSENSE
Fixed off–time reset
Current
Protection
Trigger
Trigger on
Comp
1.1 V
TRIP2
GND
Setup trigger
Current Comp.
OUTGND2
OUT2_d
UVLO
INV2
DLY
LL2
3.8 V
Hysteretic Comp.
Out2_u
DLY
LH2
1.185 V
VREF5
SFT2
SOFT START2
Vcc
STBY1
Vref
STBY2
REF
2
4.5 V
1.185 V
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
REG5Vin
TPS5602
DUAL, FAST, HIGH EFFICIENCY CONTROLLER FOR DSP POWER
SLVS217 – JUNE 1999
Terminal Functions
TERMINAL
NAME
NO.
I/O
DESCRIPTION
COMP
12
I/O
Voltage monitor comparator input
CT
5
I/O
The oscillator frequency external capacitor connection
GND
7
Control GND
INV1
1
I
CH1 hysteretic comparator inverting input
INV2
15
I
CH2 hysteretic comparator inverting input
LH1
30
I/O
CH2 high-side gate drive boost capacitor input
LH2
16
I/O
CH1 high-side gate drive boost capacitor input
LL1
28
I/O
CH1 high-side drive and current protection
LL2
18
I/O
CH2 high-side drive and current protection
NC
2, 4, 6, 14
OUT1_d
27
I/O
CH1 low-side gate drive output
OUT2_d
19
O
CH2 low-side gate drive output
OUT1_u
29
O
CH1 high-side switch output
OUT2_u
17
O
CH2 high-side switch output
OUTGND1
26
OUTGND2
20
REF
8
O
1.185-V reference voltage output
REG5V_IN
21
I
External 5-V input
SOFTSTART1
3
I/O
CH1 soft start control external capacitor connection
SOFTSTART2
13
I/O
CH2 soft start control external capacitor connection
STBY1
9
I
CH1 standby control
STBY2
10
I
CH2 standby control
TRIP1
25
I
CH1 output current control input
TRIP2
23
I
CH2 output current control input
VCC
Vref5
11
I
Supply voltage input
22
O
5-V internal regulator output
VCCSENSE
24
I
Supply voltage sense input
Output GND 1
Output GND 2
detailed description
vref (1.185 V)
The reference voltage is used for the output voltage setting and the voltage protection (COMP).
vref (5 V)
An internal linear voltage regulator offers a fixed 5-V voltage as the bootstrap voltage so that the design for the
bootstrap is much easier. The tolerance is 6%. The extra current capability can also be used to power external
circuitry.
5-V switch
If the internal 5-V switch senses a 5-V input from REG5V pin, the internal 5-V linear regulator will be
disconnected from the MOSFET drivers. The external 5-V will be used for the low-side driver and the high-side
bootstrap, thus increasing the efficiency.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
3
TPS5602
DUAL, FAST, HIGH EFFICIENCY CONTROLLER FOR DSP POWER
SLVS217 – JUNE 1999
detailed description (continued)
hysteretic comparator
Each channel has a hysteretic comparator to regulate the output voltage of the synchronous-buck converter.
The hysteresis is set internally and is typically 8.5 mV. The total delay from the comparator input to the driver
output is typically 500 ns from low to high and 350 ns from high to low.
low-side driver
The low-side driver is designed to driver low-Rds(on) n-channel MOSFETs. The maximum drive voltage is 5 V
from Vref5. The current rating of the driver is typically 1 A, source and sink.
high-side driver
The high side driver is designed to drive low-Rds(on) n-channel MOSFETs. The current rating of the driver is
1 A, source and sink. When configured as a floating driver, the bias voltage to the driver is developed from the
Vref5, limiting the maximum drive voltage between OUTxU and LLx to 5 V. The maximum voltage that can be
applied between LHx and OUTGNDx is 30 V.
deadtime control
Deadtime control prevents shoot-through current from flowing through the main power FETs during switching
transitions by actively controlling the turnon time of the MOSFETs drivers. The typical deadtime from
low-side-driver-off to high-side-driver-on is 75 ns and 164 ns from high-side-driver-off to low-side-driver-on.
current protection
The current protection is achieved by sensing the high-side power MOSFET drain-to-source voltage drop during
on-time through VCCSense and LLx pins. An external resistor between Vin and TRIPx pin with the internal
current source connected to the current comparator negative input adjusts the current limit. The typical internal
current source current is 15 µA. When the voltage on the positive pin is lower than the negative pin, the current
comparator turns on the trigger, and then activates the oscillator. This oscillator repeatedly resets the trigger
until the overcurrent condition is removed. The equation for the external resistor selection is:
Rclmt
+ Rds(on)
)
ń
(Itrip Iind(p-p) 2)
0.000015
Where Rds(on) is the MOSFET turnon resistance; Itrip is the required trip current; Iind(p-p) is the peak-to-peak
inductor ripple current. Itrip must be greater than 0.5×Iind(p-p). The tolerance is ±30%.
COMP
COMP is an internal comparator used for any voltage protection such as the output under-voltage protection
for DSP power applications. If the core voltage is lower than the setpoint, the comparator turns off both channels
to prevent the DSP from damage.
SOFT1, SOFT2
Separate soft-start terminals make it possible to set the sequencing of each output for any possibility. The
capacitor value for a start-up time can be calculated by the following equation:
C=2×T
(µF)
Where C is the external capacitor value, T is the required start-up time in (ms).
STBY1, STBY2
Both channels can be switched into standby mode separately by grounding the STBY pin. The standby current
is less than 1 µA. The STBY pins can be used for sequencing.
UVLO
When the input voltage rises to about 3.8 V, the IC is turned on, ready to function. When the input voltage falls
below the turnon value, the IC is turned off. The typical hysteresis is 149 mV.
4
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
TPS5602
DUAL, FAST, HIGH EFFICIENCY CONTROLLER FOR DSP POWER
SLVS217 – JUNE 1999
absolute maximum ratings over operating free-air temperature (see Note 1) (unless otherwise
noted)†
Supply voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to 27 V
Input voltage, VI, INV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to 7 V
Softstart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to 7 V
COMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to 6 V
REG5V_IN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to 6 V
STBY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to 15 V
TRIP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to 15 V
Maximum Driver current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 A
Output voltage, LLx . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to 27 V
Output voltage, OUTx_u . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to 32 V
Output voltage, OUTx_d . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to 7 V
Power dissipation (TA = 25°C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Dissipation Table
Operating free-air temperature range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 40°C to 85°C
Operating virtual junction temperature range, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125°C
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 55°C to 150°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 under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTE 1: All voltages are with respect to GND terminal.
DISSIPATION RATING TABLE
PACKAGE
TA = 25°C
POWER DISSIPATION
DBT
TA ≥ 25°C
DERATING FACTOR
874 mW
TA = 85°C
POWER DISSIPATION
6.993 mW/°C
454 mW
recommended operating conditions
MIN
Supply voltage, VCC
Input voltage, VI
NOM
4.5
MAX
25
INV1/2
6
COMP
6
SOFTSTART1/2
6
REG5V_IN
5.5
STBY1/STBY2
12
TRIP1/2
VCC_SENCE
25
Operation junction temperature range, TA
–40
85
UNIT
V
V
°C
electrical characteristics over recommended TA = –40°C to 85°C temperature range, VCC = 7 V
(unless otherwise noted)
reference voltage
PARAMETER
Vreff
Reference voltage
VI(Regin)
VI(Regl)
Line regulation
Load regulation
TEST CONDITIONS
TA = 25°C,
VI = 4.5 V to 25 V,
Ivref = 50 µA
I = 1 µA to 1 mA
VCC = 5.5 V to 25 V,
I = 1 µA to 1 mA,
I = 50 µA
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
MIN
TYP
MAX
1.167
1.185
1.203
1.155
1.215
UNIT
V
0.2
12
mV
0.5
10
mV
5
TPS5602
DUAL, FAST, HIGH EFFICIENCY CONTROLLER FOR DSP POWER
SLVS217 – JUNE 1999
quiescent current
PARAMETER
TEST CONDITIONS
ICC
Operating current without switching
Both STBY >2.5 V,
VI = 4.5 V to 25 V
No switching
I(CCS)
Stand-by current
Both STBY
