SI9169_07 Datasheet, PDF (5/10 Pages) Vishay Siliconix – High Frequency 1-A Synchronous Buck/Boost Converter

TYPICAL CHARACTERISTICS 25 °C, unless otherwise noted
800
250
700
200
600
Si9169
Vishay Siliconix
500
150
400
100
300
200
2
3
4
5
6
7
V_DD - (V)
PWM Supply Current
50
2
3
4
5
6
7
V_DD - (V)
PSM Supply Current
PIN CONFIGURATION AND ORDERING INFORMATION
GND
SD
PWM/PSM
V_IN/OUT
V_IN/OUT
V_IN/OUT
SYNC
GND
V_REF
FB
TSSOP-20
1
20
2
19
3
18
4
17
5
16
6 ^Si9169 15
7
14
8
13
9
12
10
11
Top View
COIL
COIL
MODE
PGND
PGND
V_S
V_O
V_DD
R_OSC
COMP
ORDERING INFORMATION
Part Number
Temperature Range
Si9169BQ-T1-E3
- 25 to 85 °C
Si9169DQ-T1-E3
- 40 to 85 °C
Package
Tape and Reel
PIN DESCRIPTION
Pin Number Name
Function
1
GND Low power controller ground. Can be left unconnected for load currents below 600 mA.
2
SD
Shuts down the IC completely and decreases current consumed by the IC to < 1 µA.
3
PWM/PSM Logic high = PWM mode, logic low = PSM mode. In PSM mode, synchronous rectification is disabled.
4, 5, 6
7
8
V_IN/OUT
SYNC
GND
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
9
V_REF 1.3 V reference. Decoupled with 0.1 µF capacitor.
10
FB
Output voltage feedback connected to the inverting input of an error amplifier.
11
COMP Error amplifier output for external compensation network.
12
Rosc External resistor to determine the switching frequency.
13
14
15
16, 17
V_DD
V_O
V_S
PGND
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.
18
19, 20
MODE
COIL
Determines the converter topology. Connect to AGND for buck or V_DD for boost.
Inductor connection node
Document Number: 70945
S-72058-Rev. E, 08-Oct-07
www.vishay.com
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