High Frequency 600-mA Synchronous Buck/Boost Converter
DESCRIPTION
The Si9165 provides fully integrated synchronous buck or
boost converter solution for the latest one cell Lithium Ion
cellular phones. Capable of delivering up to 600 mA of output
current at + 3.3 V, the Si9165 provides ample power for
various baseband circuits as well as for some PAs. It
combines the 2 MHz switching controller with fully integrated
high-frequency MOSFETs to deliver the smallest and most
efficient converter available today. The 2 MHz switching
frequency reduces the inductor height to new level of 2 mm
and minimizes the output capacitance requirement to less
than 10 µF with peak-to-peak output ripple as low as 10 mV.
Combined with low-gate charge high-frequency MOSFETs,
the Si9165 delivers efficiency up to 95 %. The programmable
pulse skipping mode maintains this high efficiency even
during the standby and idle modes to increase overall battery
life and talktime. In order to extract the last ounce of power
from the battery, the Si9165 is designed with 100 % duty
cycle control for buck mode. With 100 % duty cycle, the
Si9165 operates like a saturated linear regulator to deliver
the highest potential output voltage for longer talktime.
The Si9165 is available in lead (Pb)-free TSSOP-20 pin
packages. In order to satisfy the stringent ambient
temperature requirements, the Si9165 is rated to handle the
industrial temperature range of - 25 °C to 85 °C.
FEATURES
•
•
•
•
Voltage Mode Control
Fully Integrated MOSFET Switches
RoHS
2.7 V to 6 V Input Voltage Range
COMPLIANT
Programmable PWM/PSM Control
- Up to 600 mA Output Current at 3.3 V in PWM
- Up to 2 MHz Adjustable Switching Frequency in PWM
- Less than 200 µA Quiescent Current in PSM
Integrated UVLO and POR
Integrated Soft-Start
Synchronization
Shutdown Current < 1 µA
•
•
•
•
STANDARD APPLICATION CIRCUITS
V
IN
2.7 to 6
V
V
OUT
0 to 600 mA
V
IN
2.7 to 6
V
V
DD
MODE
COIL
V
O
V
S
V
IN/OUT
FB
SHUTDOWN
PWM/PSM
SYNC
PGND
COMP
R
OSC
REF
GND
SHUTDOWN
PWM/PSM
SYNC PGND
V
DD
MODE
V
S
V
IN/OUT
V
O
COIL
PGND
FB
COMP
R
OSC
REF
GND
V
OUT
0 to 600 mA
Boost Configuration
Document Number: 70845
S-72058-Rev. D, 08-Oct-07
Buck Configuration
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1
Si9165
Vishay Siliconix
ABSOLUTE MAXIMUM RATINGS
Parameter
Voltages Referenced to GND
V
DD
MODE, PWM/PSM, SYNC, SD, V
REF
, R
OSC
, COMP, FB
V
O
PGND
Voltages Referenced to PGND
V
S
, V
IN/OUT
COIL
Peak Output Current
Continuous Output Current
Storage Temperature Range
Operating Junction Temperature
Power Dissipation (Package)
a
20-Pin TSSOP (Q Suffix)
b
20-Pin TSSOP
Thermal Impedance (Θ
JA
)
Notes:
a. Device Mounted with all leads soldered or welded to PC board.
b. Derate 8.0 mW/°C above 25 °C.
Limit
6.5
- 0.3 V to V
DD
+ 0.3 V
- 0.3 V to V
S
+ 0.3 V
± 0.3
6.5
- 0.4 V to V
IN/OUT
+ 0.4 V
3
1
- 65 to 150
150
1.0
125
Unit
V
V
A
°C
W
°C/W
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 CONDITIONS
Parameter
Voltages Referenced to GND
V
DD
MODE, PWM/PSM, SYNC, SD
Voltages Referenced to PGND
V
S
, V
IN/OUT
F
OSC
R
OSC
V
REF
Capacitor
Limit
2.7 V to 6 V V
0 V to V
DD
2.7 V to 6 V
200 kHz to 2 MHz
25 kΩ to 300 kΩ
0.1
Unit
V
V
kΩ
µF
SPECIFICATIONS
Test Conditions
Unless Otherwise Specified
2.7 V
<
V
DD
< 6 V,
V
IN/OUT
= 3.3 V, V
S
= 3.3 V
I
REF
= 0 A
T
A
= 25 °C, I
REF
= 0
V
DD
= 3.3 V, - 500 µA < I
REF
< 0
Limits
Min
a
1.268
1.280
Typ
b
1.3
1.3
3
60
2.3
V
UVLOLH
- V
UVLOHL
2.4
0.1
6
0.7 V
DD
0.3 V
DD
- 1.0
1.0
2.5
Max
a
1.332
1.320
Unit
Parameter
Reference
Output Voltage
Load Regulation
Power Supply Rejection
UVLO
Under Voltage Lockout (turn-on)
Hysteresis
Soft-Start Time
SS Time
Mode
Logic High
Logic Low
Input Current
Symbol
V
REF
ΔV
REF
P
SRR
V
UVLO/LH
V
HYS
t
SS
V
IH
V
IL
I
L
V
mV
dB
V
ms
V
µA
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2
Document Number: 70845
S-72058-Rev. D, 08-Oct-07
Si9165
Vishay Siliconix
SPECIFICATIONS
Test Conditions
Unless Otherwise Specified
2.7 V
<
V
DD
< 6 V,
V
IN/OUT
= 3.3 V, V
S
= 3.3 V
Limits
Min
a
2.4
0.8
- 1.0
2
Nominal 1.60 MHz, R
OSC
= 30 kΩ
D
MAX
F
SYNC
/F
OSC
F
SW
= 2 MHz
- 20
75
50
1.2
50
50
50
I
BIAS
A
VOL
V
FB
BW
I
EA
Source (V
FB
= 1.05 V), V
COMP
= 0.75 V
Sink (V
FB
= 1.55 V), V
COMP
= 0.75 V
V
IN
≤
V
OUT
= 2.7 to 5.0 V
I
OUT
V
IN
≥
V
OUT
= 2.7 to 6.0 V
V
IN
= 3.3 V, V
OUT
= 3.6 V
V
IN
= 3.6 V, V
OUT
= 2.7 V
r
DS(on)
V
S
≥
3.3 V
1
600
600
150
150
130
160
165
25
V
DD
= 3.3 V, F
OSC
= 2 MHz
I
DD
V
DD
= 3.3 V
V
DD
= 3.3 V, SD = 0 V
500
180
750
250
1
µA
300
330
mΩ
mA
T
A
= 25 °C
V
FB
= 1.5 V
-1
50
1.270
1.258
60
1.30
1.30
2
-3
3
-1
1.330
1.342
1
µA
dB
V
MHz
mA
ns
85
65
1.5
20
%
1.0
Typ
b
Max
a
Unit
Parameter
SD, SYNC, PWM/PSM
Logic High
Logic Low
Input Current
Oscillator
Maximum Frequency
Accuracy
Maximum Duty Cycle (Buck, Non LDO Mode)
Maximum Duty Cycle (Boost)
SYNC Range
SYNC Low Pulse Width
SYNC High Pulse Width
SYNC t
r
, t
f
Error Amplifier
Input Bias Current
Open Loop Voltage Gain
FB Threshold
Unity Gain BW
Output Current
Output Current
Output Current (PWM)
Boost Mode
c
Buck Mode
d
Boost Mode
c
Buck Mode
d
Symbol
V
IH
V
IL
I
L
F
MAX
V
µA
MHz
Output Current (PSM)
r
DS(on)
N-Channel
r
DS(on)
P-Channel
Over temperature protection
Trip Point
Hysteresis
Supply Current
Normal Mode
PSM Mode
Shutdown Mode
Rising Temperature
°C
Notes:
a. The algebraic convention whereby the most negative value is a minimum and the most positive a maximum.
b. Typical values are for DESIGN AID ONLY, not guaranteed nor subject to production testing.
c. V
IN
= V
DD
, V
OUT
= V
IN/OUT
= V
S
= V
O
, L = 1.5 µH.
d. V
IN
= V
DD
= V
S
= V
IN/OUT
, V
OUT
= V
O
, L = 1.5 µH.
Document Number: 70845
S-72058-Rev. D, 08-Oct-07
www.vishay.com
3
Si9165
Vishay Siliconix
TYPICAL CHARACTERISTICS
25 °C, unless otherwise noted
1.310
1.32
1.305
V
REF
(V)
V
REF
(V)
2.5
3.0
3.5
4.0
V
DD
- (V)
4.5
5.0
5.5
6.0
1.31
1.300
1.30
1.295
1.29
1.290
2.0
1.28
- 50
0
50
Temperature (°C)
100
150
V
REF
vs. V
DD
2.00
10000
V
REF
vs. Temperature
1.95
R
OSC
= 25 k
Ω
Frequency (MHz)
1.85
Frequency (kHz)
- 50
0
50
100
150
1.90
1000
1.80
1.75
1.70
- 100
100
10
100
R
OSC
(kΩ)
1000
Temperature (°C)
Frequency vs. Temperature
100
95
90
PSM - 3.6 V
PSM - 3 V
Frequency vs. R
OSC
95
90
85
Efficiency (%)
PWM - 2.7 V
PWM - 3.3 V
PSM - 3.3 V
Efficiency (%)
85
PSM - 4.2 V
PWM - 3 V
PWM - 3.6 V
80
PSM - 2.7 V
80
75
70
65
60
1
10
100
1000
Load Current (mA)
PWM - 4.2 V
75
70
65
60
1
10
100
1000
Load Current (mA)
Buck Mode Efficiency, V
O
= 2.7 V
Boost Mode Efficiency, V
O
= 3.6 V
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Document Number: 70845
S-72058-Rev. D, 08-Oct-07
Si9165
Vishay Siliconix
TYPICAL CHARACTERISTICS
25 °C, unless otherwise noted
800
250
700
200
600
I
DD
(mA)
I
DD
(mA)
2
3
4
V
DD
- (V)
5
6
7
500
150
400
100
300
200
50
2
3
4
5
V
DD
- (V)
6
7
PWM Supply Current
PSM Supply Current
PIN CONFIGURATION AND ORDERING INFORMATION
TSSOP-20
NC
SD
PWM/PSM
V
IN/OUT
V
IN/OUT
V
IN/OUT
SYNC
GND
V
REF
FB
1
20
2
19
3
18
4
17
5
16
Si9165BQ
6
15
7
14
13
8
9
12
10
11
Top View
COIL
COIL
MODE
PGND
PGND
V
S
V
O
V
DD
R
OSC
COMP
ORDERING INFORMATION
Part Number
Si9165BQ-T1-E3
Eval Kit
Si9165DB
Temperature Range
- 25 to 85 °C
Temperature Range
- 25 to 85 °C
Package
Tape and Reel
Board Type
Surface Mount
PIN DESCRIPTION
Pin Number
1
2
3
4, 5, 6
7
8
9
10
11
12
13
14
15
16, 17
18
19, 20
Name
N/C
SD
V
IN/OUT
SYNC
GND
V
REF
FB
COMP
Rosc
V
DD
V
O
V
S
PGND
MODE
COIL
Not Used
Shuts down the IC completely and decreases current consumed by the IC to < 1 µA.
Input node for buck mode and output node for boost mode.
Externally controlled synchronization signal. Logic high to low transition forces the clock synchronization.
If not
used, the pin must be connected to V
DD
, or logic high.
Low power controller ground
1.3 V reference. Decoupled with 0.1 µF capacitor.
Output voltage feedback connected to the inverting input of an error amplifier.
Error amplifier output for external compensation network.
External resistor to determine the switching frequency.
Input supply voltage for the analog circuitry. Input voltage range is 2.7 V to 6 V.
Direct output voltage sensing to control peak inductor current in PSM mode.
Supply voltage for the internal MOSFET drive circuit.
Power ground.
Determines the converter topology. Connect to AGND for buck or V
DD
for boost.
Inductor connection node
Function
PWM/PSM Logic high = PWM mode, logic low = PSM mode. In PSM mode, synchronous rectification is disabled.
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